4-2
OVERHAUL INSTRUCTIONS
2.
Testing the Compression Pressure
(1) Remove the injection nozzle from the cylinder head
where the compression pressure is to be measured.
(2) On the direction injection type engine, attach gauge
adapter (30691 - 21100) to the cylinder, and connect
the compression gauge (32A91 - 03100) to the adapter.
(3) Crank the engine by means of the starter, with the
governor stop lever pulled (the fuel supply shut off),
and read the compression gauge indication when the
engine running at the specified speed.
(4) If the compression pressure is lower than the repair
limit, overhaul the engine.
Unit: MPa (kgf/cm
2
) [psi]
CAUTION
(1) Measure the compression pressure on all
cylinders. It is not a good practice to
measure the compression pressure on only
few cylinders, and presume the compression
on the remaining cylinders.
(2) Compression pressure varies with engine
speed. Check engine speed when measuring
the compression pressure.
Item
Assembly
Repair
Standard
Limit
Compression pressure
3.2 (33) [469]
2.8 (29) [413]
NOTE
Measure the compression pressure with the engine
running at 300 min
-1
.
CAUTION
(1) M e a s u re t h e c o m p re s s i o n p re s s u re a t
regular intervals to obtain correct data.
(2) The compression pressure will be slightly
higher in a new or overhauled engine due to
new piston rings, valve seats, etc. Pressure
will drop gradually by the wear of parts.
Gauge adapter
Compression
gauge
Measuring compression pressure
CAUTION
When replacing parts, make sure to use
OEM designated parts. If OEM parts are
not used, the exhaust emission's warranty
will be voided. New parts may be updated
due to improvement. Fuel and Exhaust
system repairs should only be conducted
by an authorized Mitsubishi forklift dealer.
Tampering or adjusting the fuel system
components will void the warranty and
could be in violation of the EPA regulations.
The fuel injection pump must be replaced
as an assembly.