09200-02620 PUMP ASSY, INJECTI Calibration Data

Measurement of Compression Pressure
Preparation For Inspection
Check the following before inspection.(1) Make sure that the engine oil, air cleaner, starter, battery, etc. are in normal operating condition.
Measurement of compression pressureInspection
(1) Move the control lever to the Stop position.(2) Remove the glow plugs from all cylinders, and attach the gage adapter and compression gage to the cylinder to be tested. (3) Crank the engine with the starter, and read the compression gage indication when the indication stabilizes.(4) If the measured compression pressure is lower than the limit, consider overhauling the engine.
(a) Measure the compression pressure in all cylinders.(b) As compression pressure varies with the engine speed, measure the engine speed at the same time.
Measure the compression pressure while the engine is running at 150 to 200 min-1. The oil and coolant temperatures should be between 20 and 30 °C [68 and 86°F].
(a) Measure the compression pressure at regular intervals to keep the record of changes in compression pressure.(b) Compression pressure will be slightly higher when the engine is new or immediately after an overhaul due to tight clearances of piston rings and valve seats, but it decreases to the standard level after the parts break in.