Timing Chain, Sprockets, Guides and Tensioner Inspection

1. Inspect chain for wear and damaged links.

Fig. 25 Timing Chain Length Inspection.:

2. Using ruler, measure chain inner diameter, Fig. 25.
Standard I.D. is 16.50 - 16.61 inch
Service limit is 16.77 inch

Fig. 26 Timing Chain Guide Track Wear.:

3. Inspect chain guides for wear and cracks, measure chain track wear, Fig. 26.
Standard is 0.0 inch
Service limit is 0.0984 inch.

4. Inspect timing sprocket teeth on crankshaft, camshaft and key for wear. Inspect camshaft thrust plate and sprocket thrust surface for cracks and wear.
5. Inspect tensioner operation, release plunger lock, ensure piston moves freely.
6. Ensure oil feed hole is open, submerge tensioner in oil or solvent, depress plunger and check flow from tensioner body, check cylinder block port for blockage.

Fig. 27 Timing Chain Tensioner Inspection.:

7. With timing chain and guides installed, measure plunger travel, Fig. 27..
Standard is 0.0696 - 0.4380 inch
Service limit is 0.8626 inch.