Ingersoll-Rand 4IRI8T - Page 65

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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.)