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(7) Engine speed and compression pressure (for reference)
(8) 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
Cause
Corrective action
1
Air cleaner element
Clogged element
Broken element
Defect at element seal
portion
Clean the element.
Replace the element.
2
Valve clearance
Excessive or no
clearance
Adjust the valve clearance.
(See 3.5 in Chapter 3.)
3
valve timing
Incorrect valve clearance
Adjust the valve clearance.
(See 3.5 in Chapter 3.)
4
Cylinder head gasket
Gas leak from gasket
Replace the gasket.
Retighten the cylinder head bolts to the
specified torque.
(See 4.2(2)12) in Chapter 4.)
5
Intake/exhaust vale
Valve seat
Gas leak due to worn
valve seat or foreign
matter trapping
Sticking valve
Lap the valve seat.
(See 4.2(6) in Chapter 4.)
Replace the intake/exhaust valve.
6
Piston
Piston ring
Cylinder
Gas leak due to
scratching or wear
Perform honing and use an oversized part.
(See 4.4(5)-(5-1), (5-4) and (6) in Chapter 4.)
