JABSCO 18940-0010 Owner's manual

Model 18940-0010
Model 18940-0010
ENGINE COOLING
SELF-PRIMING PUMP
FEATURES
Body: Bronze
Bearing Housing :Bronze
Impeller: Jabsco Neoprene Compound
Shaft: Stainless Steel
Shaft Seal: Carbon-Ceramic Face Type
Bearings: Sealed Ball Bearing
Ports: 1-1/4" ID Hose
Pulley: 6-1/2" Full Grip “A” Belt
Weight: 7 lb (3.2 kg)
INSTALLATION AND OPERATION
The pump may be mounted in any position.The direction
of rotation of the pump determines the location of the
intake and discharge ports (refer to dimensional
drawings). Before installing, rotate the pump shaft in the
direction of the normal operating rotation of the engines
on which the pump will be mounted. The mounting
bracket used to support the pump must be designed to
enable adjustment of the pump position for proper drive
belt tension.
Attach the pump to the mounting bracket using 3/8" –16
hex head screws.The pump mounting holes are tapped
to this thread size.
Put Pulley drive belt over both the drive pulley and the
pump pulley.An“A” section pulley belt should be sufficient
to drive the 18940-0010 pump. Position the pump to
allow 1/2" deflection of the drive belt midway between
the engine and pump pulleys.Secure the pump mounting
brackets. Attach 1-1/4"ID hose to the ports and clamp
using two stainless steel band clamps per port (be sure
to attach the water intake line to the proper pump port).
Be sure that all suction lines are airtight so that the pump
will self-prime. Start the engine and run at low speed.
This pump depends on the water for lubrication.DO NOT
RUN DRY for more than 30 seconds. Lack of water will
damage the impeller. This pump is designed for liquids
between 45° and 180°F.Pumping colder water will short-
en impeller life.
Cooling system should be designed so the cooling pump
operates with a maximum of 15 psi output pressure.
WINTERIZING
Drain the pump by loosening the impeller housing bolts
and loosening the housing.Flush cooling system with an
ethylene glycol base antifreeze. NOTICE: Do not use a
petroleum based rust inhibitor in the pump. Pump
damage can result.
APPLICATIONS
• Marine engine cooling
• Replaces Sherwood model G-5 for Chrysler engines
LM 318, LM 340, LM 360, LM 383, LM 400, LM 440
• Lehman 302, 351 C.I.
• Powerhouse Marine 302, 351 C.I.
* Average engine cooling applications have discharge
pressures of 10-15 psi (69-104 kPa) and intake
vacuums of 3-5 inches of mercury (76-127 mmHg).

SERVICE INSTRUCTIONS
DISASSEMBLY
1. Remove the three impeller housing screws (Key 13).
2. Slide impeller housing (Key 2) off the bearing
housing (Key 3) and shaft (Key 4) assembly.
3. Grasping hub of impeller (Key 1) with pliers, remove
it from impeller housing.
4. Remove cam screw (Key 12) from the impeller
housing. Slide the cam (Key 6) out of the impeller
housing.
5. Remove the O-ring (Key 7) from the impeller
housing groove. TO REMOVE SEAL ASSEMBLY,
THE SHAFT AND BEARING ASSEMBLY MUST BE
REMOVED FROM THE BEARING HOUSING (KEY
3).
6. Drive roll pin (Key 11) out of the pulley and shaft sub-
assembly.
7. Loosen set screw and remove pulley (Key 5) and key
(Key 16) from shaft.
8. Remove the retaining ring (Key 10) out of the
bearing housing (Key 3).
9. Lightly tap the spline end of the shaft. Shaft and ball
bearings (Key 9) should slide out of the bearing
housing. BE CAREFUL NOT TO DAMAGE SPLINE
END OF SHAFT.
10. Ceramic portion of the seal (Key 8) assembly normally
will stay on the shaft. THE BRASS/CARBON
PORTION OF THE SEAL SHOULD HAVE
REMAINED IN THE BEARING HOUSING. Lightly
press this portion from the pulley end of the bearing
housing toward the impeller end of the bearing housing.
11. Press ball bearings (Key 9) off the shaft by supporting
each bearing on its inner race to prevent damage.
ASSEMBLY
1. Clean and inspect all components for wear or
damage. Replace all components where needed.
2. Lightly lubricate pump shaft (Key 4) and press
bearings (Key 9) onto shaft by applying force to inner
race of the bearing. DO NOT APPLY FORCE TO
OUTER RACE OF BEARING.
3. Slide ceramic (white) portion of seal (Key 8) onto
spline end of shaft with large white face toward
spline end.
4. Lightly press the brass/carbon portion of the seal
into the bearing housing (Key 3); be careful not to
damage the carbon face of the seal. Brass face
should face toward impeller end of pump and be
pressed flush with bottom of counter-bore.
5. Lightly press shaft, bearing and shaft seal (ceramic
portion) subassembly into bearing housing; be
careful not to damage shaft end or seal components
during this assembly.
6. Replace bearing retaining ring (Key 10) into bearing
housing.
7. Slide pulley (Key 5) onto shaft. Make sure that roll
pin hole in shaft lines up with hole in pulley.**
8. Drive roll pin (Key 11) into pulley and shaft and
tighten set screw.
9. Apply a thin coat of sealant to convex side of cam
(Key 6) and threads of cam screw (Key 12), and
fasten cam to impeller housing.
10. Slide impeller (Key 1) onto shaft spline and place
spline seal in impeller.
11. Slide impeller (Key 7) into groove in impeller housing
and cam subassembly. Lubricate impeller bore.With
a twisting motion, slide the impeller housing over the
impeller. Be sure the direction the impeller blades
are bent matches the direction of normal engine and
pump rotation.
12. Fasten impeller housing to bearing housing with the
three machine screws and washers (Key 13 and 14).
13. TEST pump following instructions under Installation
and Operation section.
**If the roll pin hole cannot be aligned through pulley and shaft, drill a
new 1/8" hole for roll pin at an angle 45° from original hole. Center
punch pulley hub or file a flat spot on hub to ease start of drilling
procedure.

EXPLODED VIEW
PARTS LIST
Part
Key Description Qty. Number
1 Impeller and Spline Seal* 1 11979-0001
2 Impeller Housing 1 18944-1000
3 Bearing Housing 1 18943-1000
4 Shaft 1 18836-1000
5 Pulley 1 18753-0006
6 Cam 1 10182-0000
7 O-Ring* 1 18753-0005
8 Seal* 1 96080-0080
9 Ball Bearing 2 92600-0120
10 Retaining Ring†1 See Hrdw. Kit
11 Roll Pin†1 See Hrdw. Kit
12 Cam Screw 1 91004-0090
13 Screw Kit (3 ea. with Washers) 1 18753-0001
14 Split Washer See Screw Kit
15 Set Screw†1 See Hrdw. Kit
16 Key†1 See Hrdw. Kit
Service Kit 1 90184-0001
Hardware Kit 1 18753-0010
*Included in Service Kit
†Included in Hardware Kit

U.S.A.
Jabsco
20 Icon
Foothill Ranch, CA 92610-3000
Tel: [phone]
Fax: [phone]
UNITED KINGDOM
Jabsco
Bingley Road, Hoddesdon
Hertfordsire EN11 OBU
Tel: [phone]
Fax: [phone]
CANADA
Fluid Products Canada
55 Royal Road
Guelph, Ontario N1H 1T1
Tel: [phone]
Fax: [phone]
JAPAN
NHK Jabsco Company Ltd.
3-21-10, Shin-Yokohama
Kohoku-Ku, Yokohama, 222
Tel: [phone]
Fax: [phone]
GERMANY
Jabsco GmbH
Oststrasse 28
22840 Norderstedt
Tel: [phone]
Fax: [phone]
© Copyright 2001, ITT Industries Printed in U.S.A. All Rights Reserved Form: 43000-0414 Rev. 11/2001
THE PRODUCTS DESCRIBED HEREIN ARE
SUBJECT TO THE JABSCO ONE YEAR LIMITED
WARRANTY, WHICH IS AVAILABLE FOR YOUR
INSPECTION UPON REQUEST.
DIMENSIONAL DRAWING - Inches (Millimetres)