Improved Racing FSM -RKIT Series User manual

FSM THERMOSTAT REBUILD KIT
PART NO. FSM-XXX-RKIT
MADE IN USA
For contact information, visit www.improvedracing.com
Copyright © 2008-2019 Improved Racing Products, LLC. All rights reserved.
Rev 190603
Important: Read these instructions in their
entirety prior to installation.

For contact information, visit www.improvedracing.com
2
APPLICATIONS
• The FSM-XXX-RKIT is a rebuild kit for Improved Racing’s Flow-Series-
Motorsports (FSM) family of thermostats.
• The rebuild kit can be optioned with the original temperature element,
or a different temperature should the needs of the system change.
SCHEMATIC, PARTS LIST & HARDWARE
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Figure 1 - FSM-XXX-RKIT Contents
Item Qty Part Number Description
11 HRG-1003 -034 Viton Elastomer O-ring
22 HEL-100X Element (Choose Temperature)
34 HSC-1018 M4x0.7x30 Socket Screw
41 HSG-1008 Stainless Steel Spring
GENERAL REBUILD KIT INFO
Maximum Operating
Temperature 302°F (150°C)
Minimum Operating
Temperature -22°F (-30°C)
Maximum Operating
Pressure 300 psi (20.68 bar)
HRG-1003 O-ring Info AS568 -034 Size, OD = 2.254 inch, ID = 2.114
inch, W = 0.070 inch, Viton Rubber (75A)

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HEL-100X Element
Info
Brass Body, Steel Ram & Thermostatic Wax,
>10K Cycle Life Regardless of Temperature
HSC-1018 Hardware
Info
M4x0.7x30 ISO 4762 Socket Screw, 10.9 Class
Alloy Steel, Clear-Zinc, 5g6g Fit, 3 mm Drive
HSG-1008 Spring Info
Lee Spring PN LC 072K 03 S, 302/304 Stain-
less Steel, Passivated per ASTM A967, OD =
0.845 inch, Wire Diameter = 0.072 inch, k =
22.4 lbm/inch, Squared & Ground Spring Ends
HEL-100X ELEMENT TEMPERATURE INFO
Part
Number Activation Temperature Stabilization Temperature
HEL-1000 180°F +/- 2°F
(82°C +/- 1°C)
185°F +/- 2°F
(85°C +/- 1°C)
HEL-1001 160°F +/- 2°F
(71°C +/- 1°C)
165°F +/- 2°F
(74°C +/- 1°C)
HEL-1002 212°F +/- 2°F
(100°C +/- 1°C)
215°F +/- 2°F
(101°C +/- 1°C)
HEL-1003 140°F +/- 2°F
(60°C +/- 1°C)
145°F +/- 2°F
(63°C +/- 1°C)
HEL-1004 200°F +/- 2°F
(93°C +/- 1°C)
205°F +/- 2°F
(96°C +/- 1°C)
BEFORE YOU BEGIN
Tip: The Red Numbers in Figure 2 are for disassembly steps.
Tip: The Green Numbers in Figure 2 are for reassembly steps.
Tip: Ensure that the O-ring stays in the gland during reassembly.
Tip: Perform the thermostat rebuild on a clean and level surface for the
easiest rebuild experience, and check out Improved Racing’s videos on
rebuilding the FSM thermostat: https://www.youtube.com/user/Im-
provedRacing/videos.

For contact information, visit www.improvedracing.com
4
DISASSEMBLY INSTRUCTIONS
1. Lightly clamp the thermostat down to a work surface.
2. Use a 3 mm tool to break all of the M4 screws loose in a crisscrossing
pattern. 2
3. Use the 3 mm tool to completely remove each screw from the top ther-
mostat half. Discard / recycle the screws. 3
4. Slowly release and remove the clamp from the thermostat, followed by
carefully removing the top half of the thermostat. Set aside. 4
5. Remove the old spring from the thermostat and discard / recycle. 5
6. Working from the inside oval of the gasket gland, carefully extract the
old O-ring from the gland using a gasket pick or similar tool. 6
WARNING: DO NOT damage the outside edge of the oval O-ring gland.
7. Carefully remove the valve and element from the bottom half of the
thermostat. 7
8. Remove the element from the valve and discard the element. 8
9. Clean / wipe-off all parts prior to reassembly.
REASSEMBLY INSTRUCTIONS
1. Place the bottom half of the thermostat onto the work surface. 1
WARNING: Ensure that the alignment dots are oriented properly.
2. Place the new element into the valve. 2
3. Carefully slide the valve and element back into the recess on the bottom
half of the thermostat. 3
4. Place the new O-ring into the oval gland on the bottom half of the ther-
mostat. 4
5. Place the new spring onto the valve, centered over the element. 5
6. Place the top half of the thermostat onto the spring, ensuring the spring
locates in the milled pocket within the top half of the thermostat. 6
WARNING: Ensure that the alignment dots are oriented properly.
7. Slowly compress the top half of the thermostat onto the bottom half.
Tip: Ensure that the O-ring stays in the gland during reassembly.
8. Gentlyxturethetophalfusingthesameclampasbefore.

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9. Place all four of the new M4 screws to their respectable holes in the top
half of the thermostat. 9
10. Hand-start each screw, followed by fully hand-tightening the screws with
a 3 mm tool.
11. Use a 3 mm driver and torque wrench to torque the screws in a crisscross-
ing pattern to 25 lb-in. DO NOT EXCEED THIS TORQUE. 11
12. Perform a second pass in the same pattern to validate the torque value
on the fasteners.
13. Release the clamp.
The rebuild has been completed!
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Figure 2 - FSM-XXX-RKIT Disassembly & Reassembly Steps