DETROIT DIESEL 53
2.0 Trouble Shooting (Needle Valve Injectors)
Chart 5
SUGGESTED REMEDY
9. Replace the seal ring.
1. Lap the injector body.
10. Install new body plugs.
2. Tighten the nut to 75-85 lb-ft torque. Do not exceed
the specified torque.
11. Replace the filter cap gaskets and tighten the filter
caps to 65-75 lb-ft torque.
3,4,5 and 6. Replace the needle valve and spray tip
assembly.
12. Clean up the sealing surfaces or replace the filter
caps, if necessary. Replace the filter if a cap is
7. Replace the valve spring.
replaced.
13. Disassemble the injector and clean the parts.
8. Replace the valve spring seat.
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