Technical data

2. Measuring Compression Pressure
1. Remove the glow plug of cylinder to be measured.
2. Attach a pressure gauge adapter in the screw hole of the
glow plug and connect a pressure gauge.
3. Operate the starter. Read the engine rpm and pressure
gauge when the starter speed has become constant.
Standard value is 32kg/cm2 at 280 RPM. Cylinder
and/or valve overhaul may be required should this
value fall to 26kg/cm2 or below.
4. Measure the compression pressure of other cylinders in
a similar manner.
CAUTION: IT IS NOT A PROPER WAY TO DETERMINE THE CONDITIONS OF THE OTHER
CYLINDERS FROM A RESULT OF MEASUREMENTS OF ONE CYLINDER. BE SURE TO
MEASURE THE COMPRESSION PRESSURE IN ALL CYLINDERS.
3. Judgement of Engine Conditions by Compression Pressure
1. The compression pressure tends to increase a little in a new engine until piston rings and valve
seats are broken in, and thereafter gradually decreases with the wear of these parts.
2. If the compression pressure has decreased below the repair limit, overhaul the engine.
4. Increased Lubricating Oil Consumption
The engine requires overhaul when oil consumption has increased over about 150%.