Perkins — Engine Valve Lash - Inspect/Adjust
Adjustments · Cylinder head valves
From a Perkins service manual covering: 402D-05, 403D-07, 403D-11, 403D-15, 404D-22, 404D-22T, 404D-22TA. Check it applies to your exact model before use.
Applies to: Perkins 402D-05, Perkins 403D-07, Perkins 403D-11, Perkins 403D-15, Perkins 404D-22, Perkins 404D-22T, Perkins 404D-22TA
Before you start
- To prevent possible injury, do not use the starter to turn the flywheel.
- Hot engine components can cause burns.
- Accidental engine starting can cause injury or death; disconnect and tape the stop solenoid connection.
Procedure
- Remove the valve mechanism cover.
- Rotate the crankshaft clockwise as viewed from the front until the correct cylinder is at firing position.
- Loosen the valve adjustment screw locknut.
- Place the appropriate feeler gauge between the rocker arm and the valve.
- Turn the adjustment screw until the correct valve lash is achieved.
- Tighten the valve adjustment screw locknut while holding the 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 (0.008 ± 0.0020 inch)
- Exhaust valve 0.2 ± 0.05 mm (0.008 ± 0.0020 inch)
Full service-parts list: Perkins 402D-05 →, Perkins 403D-07 →, Perkins 403D-11 →, Perkins 403D-15 →, Perkins 404D-22 →, Perkins 404D-22T →, Perkins 404D-22TA →
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.