Measuring Compression Pressure; Service Standards; Special Tools (Unit: Mm); General Inspection And Adjustment - Mitsubishi 6M60-TL Service Manual

GENERAL INSPECTION AND ADJUSTMENT

1. Measuring Compression Pressure

Service standards

Location
– Compression pressure

Special tools (Unit: mm)

Mark
Compression gauge
adapter
A
M16 × 18
• A drop in compression pressure can be used as a guide to determine when the engine should be overhauled.
• Measure the compression pressure at regular intervals. Keeping track of its transitions can provide a useful tool
for troubleshooting. On new vehicles and vehicles with newly replaced parts, the compression pressure will be
somewhat higher depending on the break-in condition of piston rings, valve seats, etc., but this will return to nor-
mal as the parts wear down.
• Before inspection, confirm that the engine oil, starter, and battery are in normal condition, and satisfy the following
conditions.
• Warm up the engine until the coolant temperature reaches approximately 75 to 85°C.
• Turn off the lights and auxiliaries.
• Place the lever in neutral.
11-10
Maintenance item
Each cylinder (at 200 rpm)
Cylinder-to-cylinder pres-
sure difference
Tool name and shape
• Remove the fuse for fuel cut to prevent fuel from being injected
CAUTION
• When cranking the engine, never shut off the power sup-
Standard value
2,940 kPa
{30 kgf/cm
–
Part No.
MH063384
while the engine is cranked using the starter.
plied to the engine electronic control unit by disconnecting
the engine electronic control unit connector or other similar
methods. If the engine is cranked with the power to the en-
gine electronic control unit shut off, the supply pump will
not be controlled by the electronic control unit, causing the
supply pump to be malfunctioned.
Limit
1,960 kPa
2 2
} {20 kgf/cm }
390 kPa
2
{4 kgf/cm }
or less
Application
Measuring compression pressure
Remedy
Inspect
Inspect