ENGINE VALVE TAPPETS INSTRUCTIONS MK1 AND MK2 W/SABRE

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INSTALL

TM-5-1940-277-20 Boat Bridge Erection Twin Jet Aluminum Hull MODEL USCSBMK1 (1940-01-105-5728) MODEL USCSBMK2 (1940-01-218-9165) Manual

REMOVE

TM 5-1940-277-20

TM 1940-20/2

3-128 ENGINE VALVE TAPPETS INSTRUCTIONS MK1 AND MK2 W/SABRE

TOOLS: 7/16 inch Socket

15/16 inch Box Wrench

Feeler Gauge Set

PARTS/MATERIALS: Rocker Cover Gasket

REMOVE:

WARNING

Engine Stop Control must be pulled out to prevent accidental

engine starting during tappet adjustment or personal injury may

result.

NOTE

Cold valve adjustment is .019 inch (.483 mm). Hot valve

adjustment is .018 inch (.457 mm). Normal adjustment procedures

should be done with the engine hot.

Open and secure engine hatches (refer to paragraph 3-154).

Remove engine rocker arm cover (refer to paragraph 3-126).

NOTE

The engine valves are numbered from front (header tank end) to

rear (flywheel end).

Using 15/16-inch open end wrench placed on nose bolt (1) of crankshaft pulley, turn engine

counterclockwise until valves number 1 (2) and 4 (3) are opened by their respective rocker arms.

Valves are open when rocker arm has pushed valve stem cap down as far as possible.

3-272.4

Change 2