Compression Check: Testing and Inspection

NOTE: Check compression pressure at 80 °C coolant temperature. The compression pressure can be checked via glow plug bore or precombustion chambers. When the minimum compression pressure is less than specified, check cylinder for leaks. Testing and Inspection


Checking









1 Unscrew all glow plugs or injection nozzles.
2 Connect remote starter to terminals 30 and 50 on starter.

Positive battery terminal can be used in place of terminal 30.

3 With transmission in neutral, crank engine several times to eject carbon deposits.

CAUTION: On engines featuring injection pumps with mechanical governors, first move stop lever (stop) in direction of engine so that injection pump will not inject fuel.






Connection for engines with bar-type glow plugs

4 Screw adapter into glow plug bore or connection (a part of compression pressure indicator) into pre-chamber.
5 Connect compression pressure indicator.






Compression pressure indicator connected to glow plug bore

6 To check pressure, crank engine by 8 revolutions while using full throttle.

On engine models 617 in general and on models 615, 616 featuring injection pumps with mechanical governors, do not use full throttle because these engines do not have throttle valves.






Compression pressure indicator connected to precombustion chamber

7 Prior to inserting the injection nozzles, fit new nozzle plates.