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Group 21 Short block
Measuring the camshaft
Cam height (inlet and exhaust), “A” 33.7 mm
Cam height “B” (for injection pump) 41.8 mm
Cam height “C” (for feed pump) 30.0 mm
Change the camshaft if the wear limits have been ex-
ceeded.
Inspection of timing gears
Special tools: 999 9683
Clean the gears and other parts of the timing system
and check them carefully. Replace gears that are bad-
ly worn or damaged.
Check the backlash with feeler gauges or a dial gauge,
special tool 999 9683.
Max. permitted backlash: 0.25 mm. If the backlash
exceeds the permitted value, then all gears in the tim-
ing system must be replaced.
Installing the crankshaft
Special tools: 998 9876, 999 9696
1. Check the cleanliness of the crankshaft drillings
and bearing surfaces, engine block and bearing
caps. Check that the bearing shells and their beds
do not have any burrs or upsets.
2. Place the main bearing shell in position in the
bearingcap. The bearing shells have an oil groove
that should be placed in the upper bearing cap.
Check that the lubrication holes in the upper
bearing shells are centered on the oil ducts.
3. Oil the bearing and main bearing journal and
mount the bearing cap in its correct place. The
chamfered edge shall face forwards on all bearing
caps.
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