2. Troubleshooting (3) Engine speed and compression pressure (reference) (kgf/cm*) (MW 200 250 300 Engine speed (rpm) 350 400 (4) 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 l Air cleaner ele- l Clogged element l Clean the element. ment 9 Broken element l Replace the element. l Defect at element seal portion 2 l Valve clearance l Excessive or no clearance l Adjust the valve clearance. (See 3.5 in Chapter 3.) 3 l Valve timing l Incorrect valve clearance l Adjust the valve clearance.
(See 3.5 in Chapter 3.) 4 l Cylinder head l Gas leak from gasket l Replace the gasket. gasket l Retighten the cylinder head bolts to the specified torque. (See 4.2 (2) @ in Chapter 4.) 5 l Intake/exhaust l Gas leak due to worn valve l Lap the valve seat. vale seat or foreign matter (See 4.2 (6) in Chapter 4.) l Valve seat trapping l Replace the intake/exhaust l Sticking valve valve. 6 l Piston 9 Gas leak due to scratching l Perform honing and use an l Piston ring or wear oversized part. l Cylinder (See 4.4 (5)-(5-1),(5-4) and (6) in Chapter 4.) 2-6