3. TROUBLESHOOTING (3) Engine speed and compression pressure (for reference) (4) Measured value and troubleshooting When the measured compression pressure is below the limit value, inspect each part by referring to the table below. 82E-5 – 98E-5 SERIES 3-7 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 clear- ance • 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 spec- ified torque. (See 4.2(2)12) in Chapter 4.) 5 • Intake/exhaust valve • 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.)