Compression Check: Testing and Inspection

NOTE: Check compression pressure at 80 °C coolant temperature. The compression pressure can be tested via heating plug bore or via prechambers. When pressure is below minimum compression pressure, check cylinders for leaks. Testing and Inspection






Model 116.120






Model 123






Model 126.120


Checking
1. Remove heating plugs or injection nozzles.
2. Connect contact handle under battery to cable connector terminal 30 and 50.

The cable connector is attached at the following points:
Model 116.120: Under battery.
Model 123 : On wheelhouse, right.
Model 126.120: On frame side member






3. Rotate engine several times at transmission idle position, so that residue and soot are thrown out.

Attention! For the above purpose, push shutoff lever (stop) in direction of engine so that the injection pump is not injecting.






Screw fitting






Compression pressure recorder, connected to glow plug bore






Compression pressure recorder, connected to prechamber

4. Enter screw fitting into glow plug bore or screw adapter (component of compression pressure recorder) into prechamber.

Connect compression pressure recorder.

5. Rotate engine 8 revolutions for testing.

Attention! For the above purpose, push shutoff lever (stop) in direction of engine so that the injection pump is not injecting.

6. Insert new nozzle reeds prior to installation of injection nozzle.