300SD (140.134) L6-3.5L DSL Turbo (603.971) (1993)
Valve Spring: Technical Service Bulletins
Excessive Power Loss (Above 10 kW) at Full Load
07.1-88071
Excessive Power Loss (above 10 kW) at Full
Engine 601, 602, 603
Revised 10/88
7/88
Load
Note:
Engine does not shake at idle speed, no noises are noticeable, compression and cylinder leakage tests are within specification, fuel filter is
not-plugged.
Cause:
Intake or exhaust valve spring is broken.
Remedy:
Replace valve spring.