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Inspection
NOTE! After disassembly, wash parts in clean diesel
oil. Replace defective or damaged parts.
Plungers and barrels
1. Inspect the lead section and tip of each plunger
for wear, scratches, discoloration, and erosion.
2. After washing with clean diesel fuel, check each
plunger by tilting approximately 15' and lifting it
approximately 30 to 35 mm [ 1.18 to 1.38 in.], as
shown in the diagram. The plunger must fall
smoothly on its own weight. Change the plunger
position by turning it slightly and check again. Re-
peat this test two or three times for each plunger.
3. If the plunger falls too quickly or sticks before it
reaches the bottom, replace the plunger and bar-
rel as a set.
Delivery valves
1. In each delivery valve, inspect the valve seat and
sliding surfaces for scratches and check contact-
ing surface to the barrel.
2. Wash parts with clean diesel oil. Lift the valve
and let it fall, making sure that it slides down
smoothly to the valve seat.
3. If the valve sticks, replace the delivery valve and
valve seat as a set.
Tappets
1. Check each tappet roller, roller bearing and
tappet pin for flaking, lotal wear and scratches.
2. Check overall clearance of tappet, taper roller,
roller bearing and tappet pin. If the measurement
exceeds the service limit, replace with a new as-
sembly.
Overall clearance of tappet roller, mm [in.]
Service Limit ............. 0.2 [0.00787]
3. Inspect the plunger contact surface of each tap-
pet. If the amount of wear exceeds the service
limit, replace with a new assembly.
Tappet wear of plunger contact area, mm [in.]
Service Limit ............. 0.2 [0.00787]
Group 23 Fuel System
157
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