IMCO Xtreme Advantage scX-sc User manual

IMCO SCX SERIES INFORMATION, OPERATION & MAINTAINANCE
1. SCX & SCX4 Drives will not fit on a standard gimbal helmet, IMCO HELMET:
#05-8025 Black or #05-8027 Silver or #05-8028 ITS Black is required.
2. Maximum engine idle speed is 800 RPM. Shift drive with a positive move, do not let
clutch sit between neutral and in gear position.
3. Do Not install propeller until the drive shift linkage has been properly installed and
tested with the engine running!
4. When using SCX or SCX4 drives it is necessary to have full hydraulic steering for
your safety.
5. When tuning engine remove propeller and shift drive into forward gear!
6. Do not run your boat with a worn or loose gimble ring or helmet, worn clevis pins, or clevis bushings.
7. Every hull is different and requires a different setup: Many different things contribute to performance:
water pickup location, cavitation plates, gear ratio, drive height, prop, weight distribution, water conditions,
weather conditions.
8. If you are installing the drive on a new application, consult the manufacture or a dealer with experience
with the hull to determine the proper drive height.
9. SCX Drive is 19 7/8” from crankshaft center line to prop shaft center line (2” shorter than standard Bravo).
SCX4 Drive is 17 7/8” from crankshaft center line to propshaft center line (4” shorter than standard Bravo).
10. The bolt pattern is different from the SCX to the SCX4, lowers cannot be interchanged.
11. Max propeller diameter on the SCX is 16 3/4”, SCX4 is 17” (always check that there
is at least 1/2” clearance between the propeller blades and the drive case.
12. Large diameter propellers installed on a #6 prop shaft will require a torque tab on single engine boats.
13. SCX and SCX4 drives require a drive oil reservoir with a minimum capacity of 1 1/2 quarts.
14. When installing drive to gimbal or lower to upper always use anti-seize on all threads
15. When installing lower to upper, inspect all “O” rings, replace as necessary, pressure check to insure
proper seal.
16. If you do your own maintenance and repairs on your IMCO drive, you will need a service manual and the
proper tools. Service manuals and tools are available at www.imcomarine.com/cal_store.
17. Always wear proper safety equipment when operating your boat, testing or running at high speeds.
18. Inspect for: oil level in drive and reservoir, leaks, loose fasteners, worn parts.
Warning!
Warning!
Warning!
Danger!
Warning!
Warning!
Before Runnng!

Recommended oil: Torco RTF GL-6 (Torco Part #A220015CE (unit) Part # S220015C (case) IMCO Part #
09-2600 (unit) Part # 09-2605 (5 Gal.) Part # 09-2610 (case) (100% Synthetic Raceing Transmission Fluid)
Replaces SAE 75W90.
To drain oil: remove drain screws from bearing carrier (right below the prop shaft) and on port side of upper.
To replace oil: pump oil in from lower drain screw until it comes out of upper drain screw hole. Replace drain
screws and add oil to drive oil reservoir.
When changing oil, run the used oil through a strainer to check for metal particles, if ther are metal
particles in the oil it is time for inspection of the gears and bearings. If oil appears milky or off colored check
for leaks.
SCX, SCX4 capacity: 5 qts + reservoir - SCX Upper with SC Lower 4 1/2 qts + reservoir.
19. Drive must be turning before shifting.
20. Do not run engine when drive is trimmed extremely high, or in trailer tow mode.
21. Do not use solvents or chemical cleaners to clean painted surfaces on the drive.
22. When installing or changing propeller use extreme caution, propeller blades can
be very sharp.
23. SCX upper vertical shaft is 17 tooth spline, SC, Merc lowers are 15 tooth spline. A 17-15 tooth
coupler is available 01-2150 (cannot be used with a spacer).
24. Use extreme caution if modifying lower, case can be weakened or handling can
be adversely affected.
25. Break in: Do not use full throttle until drive is fully warmed up, do not hold drive at wide open throttle for
more than 2 minutes for the first 3 hours of use.
26. Inspect anode (located on front of cavitation plate) for corrosion or debris; if necessary clean or replace.
27. Do not shift drive while running on hose with
propeller installed.
28. Rotation: shift linkage pushed in - right hand rotation, shift
linkage pulled out - left hand rotation.
29. Serial # location: Port side below SCX, SCX4 sticker 3/10/14
SCX Upper & SCX Lower New Break in
20 hours After Break In
80 hours
SCX4 Upper & SCX4 Lower New Break in
20 hours
New Break in
20 hours
SCX Upper & SC Lower
After Break In
80 hours
Check Drain Plug Magnet
Every 20 Hours
Warning!
Warning!
Caution!
Danger!
Caution!
Caution!

X
XXTREME
ADVANTAGE
sc
scX- X-sc sc
Parts and Service Manual
IMCO
510 East Arrow Highway
San Dimas, CA 91773
[phone] [phone] Fax [phone]
www.imcomarine.com email [email protected]

TABLE OF CONTENTS
Upper Gear Case - Disassembly 1
Upper Case Hardware & Seals (Drawing) 2
Upper Case Hardware & Seals (Parts List) 3
Upper Case Gear & Components (Drawing) 4
Upper Case Gear & Components (Parts List) 5
Upper Gear Case Assembly 6
Upper Gear Case Assembly Cont. 7
SCX Setup Diagrams 8
SCX Setup Work Sheet 9
Backlash Assembly (Diagram) 10
Lower Gear Case-Disassembly 11
Lower Gear Case (Drawing) 12
Lower Gear Case (Parts List) 13
Lower Gear Case-Assembly 14
Lower Pinion Height Measurments 15
Dissassembly-Assembly Tools 16
02/15/10 Rev 1
Serial Number
Date of Purchase
Purchased From
Check Oil Before Running
First break in oil change 5-8 hours.
Oil is filled to upper drain screw [Fig 1-33]
Pump oil from bottom drain screw [Fig 6-32]
Recommended oil change intervals 20-30 hours.
Heavy use or high HP change more often.

UPPER GEAR CASE-DISASSEMBLY
NOTE; The following instructions assume that the drive has been removed from the
transom assembly and is shifted to the “neutral” position. The lower unit has also been
removed, along with the yoke coupler end, center socket, and cross and bearings. Steps
followed by asterisk (**) are required only if inspection indicates component replacement.
Brackets following the part name represent the drawing figure # and item #.
1. Remove upper cap screws [1-7,8], remove upper cap [1-3].
2. Remove steering cap screws [1-28], remove steering cap [1-2]
3. Remove detent kit from steering cap [1-31].
4. Remove cotter key [2-23].
5. Remove shift link [2-24], shift cable retainer [2-21], shift arm [2-22]. (Shift link
removes out front of gear case).**
6. Remove shift shaft screws [2-27].
7. Remove shift shaft plug [1-9], shift shaft [2-26], yoke & cam [2-28].
8. Remove pinion hub screws [1-(22,23)].
9. Remove pinion hub assembly [2-(31-45)].
10.Disassemble pinion hub assembly.
11.Remove yoke nut [2-36], and washer [2-37].
12.Remove yoke [2-32].
13.Remove retainer nut [2-31].
14.Remove Yoke gear end shims [2-42], pinion shoulder washer [2-43], and pinion
seal carrier [2-45].
15.Remove bearings [2-(38,41)], bearing cups [2-(39,40)], and pinion gear [2-12].
Note; be sure to maintain correct assembly position of the upper & lower thrust
bearings & races.
16.Remove upper thrust race [2-6], and upper thrust bearing [2-7].
17.Remove gear assembly [2-(7-17)].
18.Disassemble gear assembly, press down on upper clutch gear to release the
clutch shaft retainer keepers and remove all components from the clutch shaft.
19.Remove lower thrust race [2-6], lower thrust bearing [2-7].
20.Remove oil tank cover [1-43], inspect magnet [1-40].
Page 1

Page 2
Upper Case Hardware & Seals
Fig-1
Item Description Qty Part Number
1 Upper Case Black 1 01-1550
1A Upper Case Silver 1 01-1557
2 Steering Cap CABlack 1 01-1551
2A Steering Cap NV Black 1 01-1552
2B Steering Cap Generic Black 1 01-1553
2C Steering Cap ITS Black 1 01-1554
2D Steering Cap Tie Bar Starboard Black 1 01-1555
2E Steering Cap Tie Bar Port Black 1 01-1556

Page 3
Upper Case Hardware & Seals
Fig-1
Item Description Qty Part Number
2F Steering Cap CASilver 1 01-1558
2G Steering Cap NV Silver 1 01-1559
2H Steering Cap Generic Silver 1 01-1560
2I Steering Cap ITS Silver 1 01-1561
2J Steering Cap Tie Bar Starboard Silver 1 01-1562
2K Steering Cap Tie Bar Port Silver 1 01-1563
3 Upper Cap 1 01-2555
4 Pinion Hub 1 01-2560
5 Screw (5/16-18 x 1/2" Button Head) 1 08-040705041
6 Top Cap Lid 1 01-2071
7 Screw (3/8-16 x 1 3/4" S/S 12 Point) 4 08-070806111
8 Screw (3/8-16 x 1 1/2" S/S 12 Point 4 08-070806101
9 Shift Shaft Plug 1 11-1024
10 Quad Ring (Cooling Water, Bottom) 1 11-4024
11 Screw (5/16-18 x 1/2" Allen Set)(Tower Retainer) 1 08-050705041
12 Quad Ring (Cooling Water, Top) 1 11-4025
13 "O" Ring (Top Cap) 1 11-2049
14 "O" Ring (Top Cap Oil Pressure) 1 11-2013
15 Spring Kit (Seal,Ball & Spring) Kit 01-2045
16 "O" Ring (Water Passage-Upper to Gimbal) 1 11-2148
17 "O" Ring (Shift Linkage) 1 11-2129
18 Pinion Hub Shims Kit 01-2548
19 "O" Ring (Pinion Hub) 2 11-2161
20 "O" Ring (Pinion Retainer Nut) 1 11-2154
21 Pinion Hub (5/16" Copper Sealing Washers) 10 08-120700004
22 Screw (5/16-18 x 1" Socket Cap) 4 08-060705082
23 Screw (5/16-18 x 1 1/2" Socket Cap) 6 08-060705102
24 Screw (3/8-16 x 3/4" HH) 2 08-010806061
25 Washer (3/8" Star) 2 08-110800001
26 Washer (3/8" AN) 2 08-100800001
27 Anode 1 01-2067
28 Screw (7/16-14 x 1 3/4" S/S 12 Point) 4 08-070907111
29 "O" Ring (Steering Cap, Oil) 1 11-2250
30 "O" Ring (Steering Cap, Shift Cavity) 1 11-2242
31 Detent Kit (Spring & Ball Cylinder) Kit 01-2044
32 Drain Screw Sealing Washer 1 11-1017
33 Drain Screw 1 01-2504
34 Guide Pads (Port & Starboard) 2 01-2471
35 Screw (1/4-20 x 1/2" Flat Head Undercut) 4 08-020604041
36 Stud (7/16 x 2 1/2") 4 08-130904141
37 Washer (7/16" AN S/S) 4 08-100900001
38 Nut (7/16-20 Nylock S/S) 4 08-080904001
39 Screw (10-24 x 5/8" Socket Cap) 1 08-060403052
40 Magnet 1 01-9587
41 Screw (1/4-20x 5/8" Socket Cap) 8 08-060604051
42 Oil Tank Gasket 1 11-1030
43 Oil Tank Cover 1 01-2574

Page 4
Upper Case Gear & Components
Fig-2

Item Description Qty Part Number
1 Upper Case Black 1 01-1550
1A Upper Case Silver 1 01-1557
2 Roller Bearing (Clutch Shaft Cap) 1 10-3042
3 Upper Cap 1 01-2555
4 Pinion Hub 1 01-2560
5 Tower Race 2 10-6041
6 Thrust Race 2 10-5045-X
7 Thrust Bearing (Gear) 2 10-4044
8 Keepers (Clutch Shaft) 2 01-2047
9 Clutch Shaft Retainer (Thrust Collar) 1 01-2189
10 Spirol Retainer Ring 2 01-2055
11 Roller Bearing (Internal Gear) 2 10-3046
12 SCX Pinion Gear 1 01-4538
13 SCX Clutch Gear 2 01-4539
14 Thrust Bearing (Clutch Spring) 2 10-4020
15 Clutch Spring 2 01-2056
16 SCX Clutch 1 01-2562
17 SCX Clutch Shaft 1 01-3556
18 Pinion Hub Shims Kit 01-2548-X
19 Roller Bearing (Clutch Shaft Tower) 1 10-3043
20 SCX Tower 1 01-2561
21 SCX Shift Cable Retainer 1 01-2573
22 SCX Shift Arm 1 01-1578
23 Cotter Key 1 08-150200141
24 SCX Shift Link 1 01-1577
25 Shift Shaft Bushing 1 10-7018
26 SCX Shift Shaft 1 01-3559
27 Screw (1/4-28 x 3/4" Socket Cap) 2 08-060602062
28 Yoke & Cam 1 01-8095
29 Seal, Shift Shaft 2 11-3030
30 Shift Shaft Bushing 1 10-7019
31 Retainer Nut 1 01-2239
32 Yoke Gear End 1 01-2085
33 Cross & Bearing 2 01-2086
34 Center Socket 1 01-2087
35 Yoke Coupler End 1 01-2088
36 Nut (Yoke Gear End)(5/8-18 Thin Nylock Steel) 1 08-091105002
37 Washer (Yoke Gear End) 1 08-121100002
38 Bearing Cone (Pinion Bearing) 1 10-1021
39 Bearing Cup (Pinion Bearing) 1 10-2022
40 Bearing Cup (Pinion Bearing) 1 10-2024
41 Bearing Cone (Pinion Bearing) 1 10-1023
42 Yoke Gear End Shims Kit 01-2020-X
43 Pinion Shoulder Washer 1 01-2241
44 Yoke Gear End Seal 1 11-3029
45 Pinion Seal Carrier 1 01-2240
Page 5
Upper Case Gear & Components
Fig-2

UPPER GEAR CASE-ASSEMBLY
NOTE; Optimum performance of the upper gear case requires “setting up” the pinion &
clutch gears with IMCO procedure as follows.
1. Take all measurements using the “SCX Setup Diagrams” (Fig 3) and the “SCX
Work Sheet” (Fig 4).
2. After all measurements are taken and proper race thickness has been
determined, place lower race [2-6] and thrust bearing [2-7] in case.
3. Place lower clutch gear [2-13] with attached tool (backlash tower 01-5579) into
case.
4. Adjust rolling preload (8-10 in/lbs) on pinion gear by changing Yoke Gear End
Shims [2-42]. Tighten nut [2-36] to 75 ft/lbs.
5. After proper rolling preload is determined, assemble pinion pack with pinion
retainer nut “O” ring [1-20] between pinion seal carrier [2-45] and retainer nut
[2-31].
6. Torque retainer nut to 200 ft/lbs. ((Tool: Pinion Retainer Nut Driver 01-5590)
(torque wrench centered on retainer nut or if using longer tool be sure to
compensate on torque value). Use new lock nut [2-36] and torque to 75 ft/lbs.
7. Install pinion pack using 4 screws [1-23] for testing.
8. Install dial indicator (indicator bracket 01-5588) and pinion gear locking tool
(pinion gear lock 01-5587) Fig-5.
9. Check backlash, adjust backlash with pinion hub shims [2-18] (average backlash
should be .006-.008.
10. Once backlash is determined check upper clutch gear by placing gear in lower
position with lower thrust race and backlash tower. This will insure backlash is
.006 -.008 is correct on upper gear.
11. Assemble drive shaft gear assembly [2-(8-17)].
12. Place the lower clutch gear [2-13] onto the clutch shaft [2-17], allowing it to rest
on the thrust collar.
13. Place the lower clutch spring thrust bearing [2-14] (silver side “up), lower clutch
spring [2-15], clutch cone [2-16], upper clutch spring [2-15], upper clutch spring
thrust bearing [2-14], (Note; use a thin layer of grease between the bearing and
the gear to keep bearing in place during assembly), (silver side “down”), upper
clutch gear [2-13], clutch shaft retainer [2-9] onto the upper clutch shaft [2-17].
14. Compress the upper clutch gear and install the upper drive shaft retainer
keepers [2-8].
15. Install complete clutch shaft assembly into gear case.
16. Align the clutch gear timing marks (“+” over “-“, or “-“ over “+”) with the center of
the rear face of the gear case.
17. Install pinion pack with “O” ring [1-19] and shims [2-18] (shims must be properly
aligned).
18. Torque pinion pack screws [1-(22-23)] (important: make sure copper sealing
washers [1-21] are in place, short screws in 2 top holes & 2 bottom holes [1-22]
longer screws in 3 port & 3 starboard holes [1-23] to 20 ft/lbs. Use “Loctite 242”
on all screws. Note: make sure that the clutch gear timing marks align to case
timing marks, roll pinion to check.
Page 6

UPPER GEAR CASE-ASSEMBLY
19. Place the shift yoke & cam assembly [2-28] into the clutch cone groove with the
nuts facing down.
20. Insert the shift link [2-24] with shift cable retainer [2-21] through front of gear case.
21. From the rear of gear case, place the small hole of the shift arm [2-22] onto the
“pin” of the shift link and secure with cotter pin [2-23]. (Be sure that the shift arm
is positioned to except the detent kit [1-31]
22. Install shift shaft [2-26] through the yoke & cam (note; use caution while installing
to avoid cutting seals) and shift arm [2-22].
23. Torque the 2 shift shaft screws [2-27] to 100 in/lbs. Use “Loctite 262” on screws.
24. Install quad ring [1-10] steering cap [1-2] including detent kit [1-31], insure “O”
rings [1-29 & 1-30] are in place.
25. Torque steering cap screws to 35 ft/lbs. Use “Perfect Seal” on threads.
26. Install quad ring [1-12] in steering cap, shift shaft plug [1-9], top cap “O” ring [1-13]
top cap oil pressure “O” ring [1-14]
27. Install top cap.
28. Torque top cap screws [1-8] (important: short screws in 2 front & 2 rear holes [1-7]
longer screws in 2 port and 2 starboard holes) to 25 ft/lbs. Use “Perfect Seal” on
threads.
29. Install oil tank cover [1-43], oil tank gasket [1-42] with “Permatex Form-Gasket 2’
(note; use a very thin layer on gasket), oil tank cover screws [1-41] with “Loctite
242”, torque to 10 ft/lbs.
Page 7

Page 8

UPPER CAP
Parallels 2.250
Measurement A - Norm 1.862
Cap Deck to Thrust Seat Total B = Norm 0.388
DECK TO PINION CENTERLINE
Deck to Tool Measurement C Norm 2.252
Less Parallel - 1.000
Total Norm 1.252
Plus 1/2 tool + 2.012
Deck to Pinion CL Total D = Norm 3.264
UPPER THRUST SEAT
Deck to Pinion CL D Norm 3.264
B - Norm 0.388
Pinion CL to Upper Thrust Seat Total E = Norm 2.876
Bearing Thickness - 0.157
Mounting Distance - 2.659
Race Thickness F = Norm 0.060
LOWER THRUST SEAT
Measurement G Norm 7.138
Parallel - 1.000
Deck to Lower Thrust Seat Total = Norm 6.138
Deck to Pinion CL D - Norm 3.262
Pinion CL to Lower Thrust Seat Total H = Norm 2.876
Bearing Thickness - 0.157
Mounting Distance - 2.659
Race Thickness J = Norm 0.060
GEAR MEASURMENTS
Gear One Measurement K1 Norm 2.091
Less Parallel - 1.000
Gear Depth One Total L Norm 1.091
Gear Two Measurement K2 Norm 2.091
Less Parallel 1.000
Gear Depth Two Total M = Norm 1.091
GEAR ASSEMBLY
Gear Depth One L Norm 1.091
Gear Depth Two M + Norm 1.091
Race Thickness F + Norm 0.060
Race Thickness J + Norm 0.060
2 x Bearing Thickness + 0.314
Retainer Spacing Measurement N + Norm 3.162
Gear Assembly Total O = 5.778
CAP CRUSH
Pinion CL to Upper Thrust Seat E + Norm 2.876
Pinion CL to Lower Thrust Seat H + Norm 2.876
Upper Thrust Seat to Lower Thrust Seat Total P = Norm 5.752
Gear Assembly Total O = Norm 5.778
Cap Crush = Norm .020-.030
SCX WORK SHEET Serial #
Page 9

Backlash Assembly
Fig-5
Page 10

LOWER GEAR CASE – DISASSEMBLY
Note; The following instructions assume that the lower unit has already been separated from
the upper gearhead. Steps followed by asterisks (**) are required only if inspection indicates
component replacement. Brackets following the part name represent the drawing figure #
and item #.
1. Bend the tabs of the bearing carrier tab washer [6-31] away from the bearing
carrier retainer nut [6-30].
2. Remove the bearing carrier retainer nut [6-30].
3. Remove the bearing carrier [6-34].
4. Remove the prop shaft [6-27]. (The prop shaft bushing [6-26], used only with the
01-8244 & 01-8248 gear sets, may come out with the prop shaft).
5. Remove the bearing carrier “O” ring [6-38], shims [6-39], & thrust washer [6-40].
6. Remove the vertical shaft flange nut [6-29].
7. Remove “O” ring [6-13], & alignment spacer [6-14], shims [6-15], & tab washer
[6-16].
8. Remove the vertical shaft [6-2] (with bearings) & pinion gear [6-25].
9. Remove the prop gear [6-25], (with bearing). (The prop shaft bushing [6-26] may
be removed from the gear at this time, if it was not removed in step #4).
10. Remove the lower vertical shaft bearing cup [6-20], & shims [6-21].
11. Remove the vertical shaft roller bearing [6-28]. **
12. Remove the upper [6-18], & lower [6-19] bearing cones from the vertical shaft. **
13. Remove the roller bearing race [6-3] from the vertical shaft. **
14. Remove the bearing cup [6-36] from the bearing carrier. **
15. Remove the prop shaft seals [6-35] from the bearing carrier. **
16. Remove the prop gear bearing cone [6-24] from the prop gear. **
17. Remove the prop gear bearing cup [6-23], & shims [6-22]. **
18. Remove the bearing cone [6-37] from the prop shaft. **
19. Remove the “O” ring [6-6]. “O” ring [6-7], & “O” ring [6-8]. **
Page 11

Lower Gear Case
Fig-6
Page 12

Description Qty Part Number
1 Lower Case (-0) Standard Length 1 01-1120
1A Lower Case (-1") Shorter 1 01-1121
1B Lower Case (-2") Shorter 1 01-1122
2 Vertical Shaft-Standard Length (17 Tooth) 1 01-3265
2A Vertical Shaft-1" Shorter (17 Tooth) 1 01-3266
2B Vertical Shaft-2" Shorter (17 Tooth) 1 01-3267
3 Bearing Race 1 10-6005
4 Nut (7/16-20 Nylock S/S Thin) 2 08-090904001
5 Washer ((7/16" AN S/S Thin) 2 08-160900001
6 "O" Ring (Oil Passage) 1 11-4011
7 "O" Ring (Water Passage) 1 11-2143
8 "O" Ring (Cooling Water Passage) 1 11-2014
9 Pipe Plug - 1/8 NPT S/S 1 09-2007
10 Stud (7/16 x 2" S/S) 2 08-130904121
11 Retainer Ring (Vertical Shaft Coupler) 1 08-121500001
12 Vertical Shaft Coupler (17 Tooth) 1 01-2140
13 "O" Ring (Alignment Spacer) 1 11-2228
14 Alignment Spacer 1 01-2015
15 Shim (Vertical Shaft Upper) Kit 01-2012
16 Tab Washer (Vertical Shaft) 1 01-2043
17 Bearing Cup (Vertical Shaft Upper) 1 10-2012
18 Bearing Cone (Vertical Shaft Upper) 1 10-1011
19 Bearing Cone (Vertical Shaft Lower) 1 10-1010
20 Bearing Cup (Vertical Shaft Lower) 1 10-2009
21 Shim (Vertical Shaft Lower) 1 01-2013
22 Shim (Prop Gear) Kit 01-2014
23 Bearing Cup (Prop Gear) 1 10-2007
24 Bearing Cone (Prop Gear) 1 10-1008
25 Prop & Pinion Gear 1:50 Set 01-8240
25A Prop & Pinion Gear 1:34 Set 01-8244
25B Prop & Pinion Gear 1:25 Set 01-8248
26 Bushing - Prop Shaft, -X 1 01-2178
27 Prop Shaft, 1" 1 01-3009
27A Prop Shaft, 1 1/4" 1 01-3010
27B Prop Shaft, 1 7/16" 1 01-3570
28 Bearing (Roller) 1 10-3006
29 Nut (Pinion Gear) 1 01-2251
30 Cover Nut 1 01-2065
31 Tab Washer (Bearing Carrier) 1 01-2042
32 Drain Screw 1 01-2504
33 Drain Screw Sealing Washer 1 11-1017
34 Bearing Carrier (1" Prop Shaft) 1 01-2130
34A Bearing Carrier (1 1/4" Prop Shaft) 1 01-2131
34B Bearing Carrier (1 7/16" Prop Shaft) 1 01-2575
35 Seal (Prop Shaft 1") 1 11-3035
35A Seal (Prop Shaft 1" Line Cut) 1 11-3032
35B Seal (Prop Shaft 1 1/4") 2 11-3033
35C Seal (Prop Shaft 1 7/16") 2 11-3034
36 Bearing Cup (I" Prop Shaft) 1 10-2014
36A Bearing Cup (1 1/4" Prop Shaft) 1 10-2016
36B Bearing Cup (1 7/16" Prop Shaft) 1 10-2018
37 Bearing Cone (1" Prop Shaft) 1 10-1013
37A Bearing Cone (1 1/4" Prop Shaft) 1 10-1015
37B Bearing Cone (1 7/16" Prop Shaft) 1 10-1017
38 "O" Ring (Bearing Carrier) 1 11-2344
39 Shim (Bearing Carrier) Kit 01-2011
40 Thrust Washer (.109 Thick) 1 01-2042
Lower Gear Case Fig-6
Page 13

LOWER GEAR CASE - ASSEMBLY
Note; Optimum performance of lower gears requires pinion height setup, use “ Lower Pinion
Gear Height Measurement” (Fig. 7) sheet to set pinion gear.
1. Install the vertical shaft roller bearing [6-28] into the gear case.
2. Install the vertical shaft lower bearing cup [6-20], & shims [6-21].
3. Install the lower [6-19], upper [6-18] bearing cones, and roller bearing race [6-3]
onto the vertical shaft [6-2].
4. Install the vertical shaft into the gear case.
5. Install the upper bearing cup [6-17]. Tab washer [6-16], shims [6-15], & alignment
spacer [6-14] onto the vertical shaft.
6. Install the vertical shaft clamp plate onto the gear case. (Mercury Part # 43559T)
7. Check the rolling torque of the vertical shaft (optimum 3 to 5 lb/in).
8. Adjust the thickness of the upper shim to obtain the correct rolling torque.
9. Temporarily install the pinion gear [6-25], & flange nut [6-29].
10. Check the pinion gear height (optimum .025) (see “Lower Pinion Height
Measurement” (Fig. 7)
11. If pinion gear height requires correction remove all associated components and
adjust the lower bearing shims. Any adjustment here requires that the upper
bearing shims be compensated by the same amount.
12. Remove the vertical shaft & pinion.
13. Install the prop gear bearing shims [6-22], & bearing cup [6-23] into the gear case.
14. Install the prop gear bearing cone [6-24] onto the prop gear [6-25].
15. Install the prop gear with bearing into the gear case. (The prop shaft bushing
[6-26], used only with the 01-8244 and 01-8248 gear sets, must be installed into
the prop gear at this time).
16. Re-install the vertical shaft components described above, and install the vertical
shaft clamp plate.
17. Install the bearing carrier bearing cone [6-37] onto the prop shaft.
18. Install the prop shaft with bearing into the gear case.
19. Install the prop shaft seals [6-35], & bearing carrier bearing cup [6-36] into the
bearing carrier [6-34].
20. Temporarily install the bearing carrier into the gear housing.
21. Install the bearing carrier tab washer [6-31], & retainer nut [6-30], and torque the
retainer nut to 150 lb/ft.
22. Rotate the vertical shaft at least 3 turns and check the prop gear backlash
(optimum .012 to .015).
23. Adjust the thickness of the prop gear bearing cup shims [6-22] to obtain the correct
backlash readings.
24. During final assembly be sure to clean & loctite the vertical shaft flange nut [6-29].
Torque the nut to 100 lb/ft.
25. Temporarily install the bearing carrier thrust washer [6-40], & shims [6-39] prior to
prop shaft & bearing carrier installation.
26. Torque the bearing carrier retainer nut to 150 lb/ft.
27. Check overall rolling torque at the vertical shaft (optimum 11 to 17 lb/in).
Page 14

LOWER GEAR CASE – ASSEMBLY CONT.
28. Adjust the thickness of the bearing carrier shims [6-39] to obtain the correct rolling
torque readings.
29. Upon final assembly be sure to install the bearing carrier “O” ring [6-38] prior to
installation of the bearing carrier.
30. After applying final torque of the bearing carrier retainer nut [6-30], bend one tab
of the tab washer [6-31] to engage with one of the slots in the retainer nut.
Lower Pinion Height Measurement
Fig-7
Page 15

Disassembly-Assembly Tools
SCX Upper
IMCO Mercury
1. Tower & Cap Race Puller Kit 01-5443
2. Tower Internal Bearing Puller Kit 01-5445
3. Tower Removal Tool Kit 01-5448
4. Pinion Retainer Nut Driver 01-5590
5. Pinion Center Measuring Slug 01-5583
6. Pinion Bearing Cup Installer (Front) 01-5580
7. Pinion Bearing Cup Installer (Back) 01-5581
8. Bearing & Race Installer (Cap) 01-5581
9. Bearing & Race Installer (Tower) 01-5582
10. Backlash Tool Kit 01-8017
A. Backlash Tower 01-5579
B. Indicator Bracket 01-5588
C. Pinion Gear Lock 01-5587
D. Backlash Wand 01-5449
E. Dial Indicator 01-5591
SC Lower
1. Cover Nut Wrench (1” Prop Shaft) 91-61069T
2. Cover Nut Wrench (1 ¼” Prop Shaft) 91-840393
3. Lower Pinion Height Gauge 91-42840
4. Prop Gear Cup Installer 91-31106
5. Vertical Shaft Roller Bearing Driver
A. Pilot 91-813653
B. Driver rod 91-37323
C. Bearing Remover 91-638T
6. Vertical Shaft Roller Bearing Installer
A. Pilot 91-813653
B. Threaded Rod 91-31229
C. Bearing Installer 91-89867
7. Clamp Plate 91-43559T
8. Dial Indicator 91-58222A1
9. Vertical Shaft Bearing Cup Puller 01-5409
10. Prop Gear Cup Puller 01-5410
11. Bearing Carrier Cup & Seal Installer (1 ¼”) 01-5411