Mitsubishi S4S Service Manual page 39

2. Testlag 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, attached
gage adaptor (32A9l-01100) to the cylinder, and
conneet the compression gage (33391-02100) to
the adaptor.
On the swirl chamber type engine, attach the gage
adaptor (30691-21100) to the cylinder, and
conneet the compression gage (33391-02100) to
the adaptor.
(3) Crank the engine by means of the starter, with
the governor stop lever pulled (the fuel supply
shut off), and read the compression gage
indication when the engine running at the
specified speed.
(4) If the compression pressure is lower than the
repair limit, overhaul the engine.
r - - - - - -
&CAUTION
1 - - - - - -
(a) Measure the compression pressure on all
cylinders. It is not a good practice to
measure the compression pressure on only
few cylinders, and presurne the compression
on the remaining cylinders.
(b) Compression pressure varies with engine
speed. Check engine speed when measuring
the compression pressure.
Unit: MPa (kgf/cm") [psi]
Item
Assembly Repair
Standard Limit
Direct
2.9 2.6
injection
(30) (27)
Compression
[427] [384]
pressure
3.2 2.8
Swirl
(33) (29)
chamber
[469] [413]
. - - - - - - - - 4
l
NOTE J r - - - - - - - - ,
Measure the compression pressure with the
engine running at 300 min-I.
OVERHAUL INSTRUCTIONS
Measuring compression pressure (direct injection type)
Measuring compression pressure (swirl chamber type)
4-3