Caterpillar C317 — Slave Piston Adjustment
Adjustments
For the Caterpillar C317, from the Caterpillar service manual.
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Procedure
- Make the slave piston adjustments with the engine stopped and cold; exhaust valves must be closed on the cylinder to be adjusted.
- Insert the proper Jacobs feeler gauge between the slave piston and the actuating pin in the valve bridge adjusting screw.
- Turn the slave piston adjusting screw in until a slight drag is felt on the feeler gauge.
- Hold the adjusting screw and tighten the locknut to 25 lbft. (35 N-m).
- Rotate the engine 360 deg. and set the clearance on the remaining slave pistons.
Tools required
- Jacobs feeler gauge P/N 16896 (Pre-91) or P/N 17902 (91) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pre-91 clearance 0.045 in. (1.14 mm)
- 91 clearance 0.050 in. (1.27 mm)
- Locknut 25 lbft. (35 N-m)
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.