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 Check cylinder compression.
6
Perform cylinder compression test (p 4-21).
NOTE
If there is compression leakage, perform steps 7
through 11.
Check valve clearance. Adjust valve clearance (p 4-19).
7
Inspect valve springs (p 3-44). Retime fuel injection pump
8
and engine if valve springs are
(model PSU, p 4-7; model 50, p 4-7).
Inspect valve seats (p 3-42),
9
A Repair or replace valve seat insert (p 3-42).
B Reface or replace valve if required (p
Inspect cylinder walls (p 3-137).
10
Service connecting rod and piston assembly (p 3-119).
11
ENGINE KNOCKS, MECHANICAL
`
Test for defective fuel injection pump.
A Replace worn or defective components (model
p 3-64; model 50, p 3-80).
B Replace defective
injection pump (model PSU, p 3-72; model 50, p 3-88).
C Retime fuel injection pump to engine (model PSU, p 4-7;
50, p
TM
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