Mitsubishi FUSO FH 1997, Service Manual

Page: 156 / 200

11-7
11
INSPECTION AND ADJUSTMENT MOUNTED IN VEHICLE
Inspection of Engine Compression
Service standards
Location Maintenance item Standard value Limit Remedy
Engine Each cylinder (200 rpm) 2550 kPa {370 lbf/in 2 , 26 kgf/cm 2 } 1960 kPa Inspect
Compression {285 lbf/in
2
,
20 kg/cm 2 }
—
Pressure difference between each — within Inspect
cylinder 390 kPa
{57 lbf/in 2 ,
4 kgf/cm
2
}
0
Special tools
Unit : mm {in.}
Location Tool name and shape Part No. Application
— Compression gauge MH061460 Measurement of engine compression
adapter
06197
M14
×
1.5
The decrease of engine compression is a signal that it is time to overhaul
the engine. It is strongly recommended that this item is inspected periodi-
cally and that you record the history of deterioration in engine perform-
ance as this will help you to diagnose causes of future irregularities.
When the vehicle is still new or immediately after installation of new
parts, there may be a slight increase in engine compression, but normal
performance will be restored soon.
• Before inspection make sure that engine oil, starter and battery are in
normal condition.
• Before inspecting the vehicle do the following:
• Run the engine to bring the temperature of the coolant up to
approximately 75 to 85
°
C {167 to 185
°
F}.
• Turn all the lights and accessory equipment OFF.
• Put transmission in neutral. (N range for automatic transmission)
• Set the steering wheel at center and straight position.