This task covers:
l Air cleaner removed. (See TM 9-2320-289-20)
Compression adapter, J-26999-30
Glow plugs removed. (See TM 9-2320-289-20)
l Mos 63W (2)
DO NOT add oil to any cylinder for compression testing. Failure to follow
this caution may result in extensive damage to engine.
Disconnect pink lead from fuel injector pump.
Install compression adapter and compression gage in glow plug hole of cylinder to be tested.
Covering should be removed from air Intake opening before cranking
engine. Failure to follow this caution may result in damage to engine.
Record compression gage reading while assistant cranks engine. Allow six puffs per cylinder.
Normal compression should be 380-400 psi (2620-2758 kPa).
Repeat steps 2 and 3 for each cylinder. Lowest cylinder reading should not be less than 80% of
highest cylinder reading, and no cylinder reading should be less than 380 psi (2620 kPa).
Remove and inspect valves and piston rings for any cylinder that fails test. (See paragraphs
3-8 and 3-1 3)
Connect pink lead to fuel injector pump.
l Install glow plugs. (See TM 9-2320-289-20)
l Install air cleaner. (See TM 9-2320-289-20)
3 - 2