Chevrolet Equinox Service Manual: Camshaft Cleaning and Inspection Valvetrain Camshaft

Special Tools

GE 7872Magnetic Base Dial Indicator

For equivalent regional tools, refer toSpecial Tools.

Warning:Refer toSafety Glasses Warning.

Inspect the camshaft oil feed holes-(1) to thecamshaft position actuator for dirt, debris or blockage.Inspect the threaded hole-(2) for damage.Inspect the camshaft position actuator locatingnotch-(3) for damage or wear.Inspect the camshaft sealing grooves-(4) fordamage.Inspect the camshaft thrust surface-(5) fordamage.Inspect the camshaft lobes-(6) andjournals-(7) for the following conditions:Excessive scoring or pittingDiscoloration from overheatingDeformation from excessive wear, especially the camshaftlobesIf any of the above conditions exist on the camshaft, replacethe camshaft.Camshaft Measurement

With the camshaft in a suitable fixture, measure the camshaftfor wear.

Measure the camshaft journals for diameter andout-of-round using an outside micrometer.Refer toEngine Mechanical Specifications.If the diameter is smaller than specifications, replace thecamshaft.If the out-of-round exceedsspecifications, replace the camshaft.

Measure the camshaft runout using theGE 7872indicator. Refer toEngine Mechanical Specifications.

Measure the camshaft thrust width for wear using a depthmicrometer. Refer toEngine Mechanical Specifications.

Measure the camshaft thrust wall surface for runout usingGE 7872indicator. Refer toEngine Mechanical Specifications.If the camshaft is damaged or worn beyond specifications,replace the camshaft. No machining of the camshaft isallowed.

Measure the camshaft lobes for wear using theGE 7872indicator.

Place theGE 7872indicatorwith the indicator tip on the base circle-(1)of the camshaft lobe.Place theGE 7872indicatorat zero.Rotate the camshaft until the indicator tip is at the highestpoint-(3) on the lobe. This reading is the lift of thecamshaft lobe. Refer toEngine Mechanical Specifications.If the indicated measurement is significantly lower thanthese specifications, replace the camshaft or engine performancewill be reduced.