Timing Chain: Testing and Inspection

Fig. 25 Timing Chain Length Inspection.:

Fig. 26 Timing Chain Guide Track Wear.:

Fig. 27 Timing Chain Tensioner Inspection.:

1. Inspect chain for wear and damaged links.
2. Using a ruler, measure chain inner diameter, standard I.D. is 22.83-22.95 inch and service limit is 23.15 inch, Fig 25.
3. Inspect chain guides for wear and cracks, measure chain track wear, standard is 0.0 inch, service limit is 0.0984 inch, Fig. 26. .
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.
7. With timing chain and guides installed, measure plunger travel, Fig.27. Standard is 0.0450-0.3880 inch, service limit is 0.8626 inch.