Quick Reference Table For Troubleshooting - Yanmar 2TNV70 Service Manual

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.
13-6
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

Quick Reference Table For Troubleshooting

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
Replace the intake / exhaust valve.
Lap the valve seat.
Perform honing and use an oversized part.
TNV IDI Service Manual
torque.