Engine System Operation and Tests
6. Test compression pressure again.
If pressure is high, worn, or stuck rings are indicated,
replace piston rings or install new piston and liner set
as needed. (See Group 10.)
If pressure is low, valves could be worn or sticking.
Recondition cylinder head as required. (See Group 05.)
7. Measure compression pressure in all remaining
cylinders and compare readings. Recondition cylinders
and valves as required.
CHECK ENGINE OIL PRESSURE
1. Remove main oil gallery plug (A) using JDG782 Oil
Gallery Plug Tool.
A--Oil Gallery Plug
Continued on next page