TESTING AND ADJUSTING MEASURING COMPRESSION PRESSURE MEASURING COMPRESSION PRESSURE a Measuring instruments for compression pressure a When measuring the compression pressure, take care not to burn yourself on the exhaust manifold, muffler, etc. or get caught in a rotating part. 6. Remove governor spring (2). 1. Adjust the valve clearance. a See Adjusting valve clearance. 7. Put governor lever (3) of the fuel injection pump to the STOP side stopper and fix it. 2. Warm up the engine until the engine oil tempera- ture is 40 – 60°C. 3. Prepare for measuring the engine speed. a See Testing and adjusting engine speed. 4.
Open the engine hood and remove nozzle holder (1) of the cylinder to measure the compression pressure. 8. Crank the engine with the starting motor and measure the compression pressure. a Read the compression gauge when its pointer is stabilized. a When measuring the compression pressure, measure the engine speed, too, and check that it is in the measurement condition range. 9. After finishing measurement, remove the mea- suring instruments and return the removed parts. a Check that the fulcrum of the clamping holder for the nozzle holder is seated on the cylinder head, and then tighten the mounting bolt. 5.
Install adapter [1] of compression gauge C to the mounting part of the nozzle holder and connect gauge [2]. a Install the gasket to the end of the adapter. a Secure the adapter with the clamping holder and mounting bolt for the nozzle holder. 3 Mounting bolt: 39.2 – 49 Nm {4 – 5 kgm} 3 Mounting bolt: 39.2 – 49 Nm {4 – 5 kgm} PC130-7 20-109 (1) Symbol Part No. Part name C 795-502-1205 Compression gauge 795-502-1370 Adapter 6204-11-3880 Gasket