Quick Reference Table For Troubleshooting - Yanmar 3TNV88F Service Manual

Quick Reference Table For Troubleshooting

■ Measured value and troubleshooting
When the measured compression pressure is below the limit value, inspect each part by referring to the
table below.
No. Item
1 Air cleaner element
2 Valve clearance
3 Valve timing
4 Cylinder head gasket
Intake/exhaust valve
5
Valve seat
Piston
6 Piston ring
Cylinder
QUICK REFERENCE TABLE FOR TROUBLESHOOTING
The following table summarizes the general trouble symptoms and their causes. If any trouble symptom
occurs, take corrective action before it becomes a serious problem so as not to shorten the engine service
life.
3TNV88F Service Manual
Cause
Clogged element
Broken element
Defect at element seal portion
Excessive or no clearance
Incorrect valve clearance
Gas leak from gasket
Sticking valve
Gas leak due to worn valve seat
or foreign matter trapped in valve
Gas leak due to scratching or
wear
FAILURE DIAGNOSIS
Corrective action
Clean the element.
Replace the element.
Adjust the valve clearance.
Adjust the valve clearance.
Replace the gasket.
Retighten the cylinder head bolts to the
specified torque.
Replace the intake/exhaust valve.
Lap the valve seat.
Perform honing and use an oversized part.
14-7