Allis-Chalmers 3500 MK II / SOOMKII 1.5 — Valve Lash Adjustment
Adjustments · Valve train
For the Allis-Chalmers 3500 MK II / SOOMKII 1.5, from the Allis-Chalmers owner's manual.
Applies to: Allis-Chalmers 3500 MKII engine
Before you start
- After mechanical work, turn rocker arm adjusting screws upward (counterclockwise) far enough to prevent pistons striking valves when cranking.
Procedure
- Run engine to minimum 160 F (344 K), then stop.
- Clean cylinder head cover area; remove breather tube, capscrews, washers and cover.
- Crank until No. 6 exhaust valve is almost closed and intake valve starts to open.
- Check and adjust intake and exhaust lash for No. 1 cylinder.
- Use 0.015 in (0.38 mm) feeler gauge; slight drag indicates correct lash.
- Turn adjusting screw clockwise to decrease, counterclockwise to increase clearance.
- Repeat for cylinders in firing order 1-5-3-6-2-4 over two crankshaft revolutions.
Tools required
- Feeler gauge 0.015 in (0.38 mm) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve lash hot 0.015 in (0.38 mm)
- Valve lash cold 0.018 in (0.45 mm)
Full service-parts list: Allis-Chalmers 3500 MKII engine →
Source: Allis-Chalmers owner's 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.