Engine compression pressure
(1) After warming up the engine, stop it and
remove the air cleaner and all the fuel
injectors.
(2) Install the diesel engine compression
gauge in the injector hole of each cylinder.
(3) Move the accelerator lever to the STOP
position (the zero position for fuel injection)
and operate the starting motor for 5-10
seconds (at 200-300 rpm). Read the
maximum value when the gauge has
stabilized. Make the measurement twice.
(4) If the pressure is below the operating limit,
put 2 cc of engine oil through the nozzle
hole. Idle the engine for a while to let the oil
penetrate and check the pressure again.
(5) If the compression pressure returns to
normal, check the cylinder, piston, and
piston ring.
(6) If the compression pressure does not
return to normal, check the valve and
cylinder head and related parts.
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