FUSO 4M4 – Engine – ON-VEHICLE INSPECTION AND ADJUSTMENT – Protrusion of Timing Chain Tensioner’s Plunger

• Measure the protrusion of the chain tensioner’s plunger to determine the elongation of the timing chain.
• Remove the chain tensioner from the cylinder head. The plunger is bounced a little out of the chain tensioner by the spring inside.
Prevent the plunger from falling.
• Measure the distance from the forward end of the plunger to the farthest wear mark.
• If the measured value exceeds the specified limit, replace the timing chain. (See “ON-VEHICLE INSPECTION AND ADJUSTMENT”, “3. Inspection and Replacement of Timing Chain”.)