Perkins 403F-11 — Engine Valve Lash - Inspect/Adjust
Adjustments · valve mechanism
For the Perkins 403F-11, from the Perkins service manual.
Applies to: Perkins 403F-11
Before you start
- Do not use the starter to turn the flywheel.
- Hot engine components can cause burns; allow engine to cool.
- Turn ignition switch OFF and disconnect stop solenoid connection to prevent accidental starting.
Procedure
- Remove valve mechanism cover with front housing installed.
- Rotate crankshaft clockwise viewed from front; when inlet valve of one cylinder starts to open and exhaust valve not fully closed, check the paired valves.
- Loosen valve adjustment screw locknut on adjustment screw.
- Place feeler gauge between rocker arm and valve; turn adjustment screw to achieve specification.
- Tighten locknut while holding adjustment screw from turning.
Tools required
- feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Inlet valve 0.2 ± 0.05 mm
- Exhaust valve 0.2 ± 0.05 mm
Source: Perkins 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.