Camshaft Cleaning and Inspection
Special Tools
GE 7872 Magnetic Base Dial Indicator
For equivalent regional tools, refer to Special Tools .
Cleaning Procedure
- Clean the camshaft in solvent.
Warning: Refer to Safety Glasses Warning in the Preface section.
- Dry the camshaft with compressed air.
Visual Inspection
- Inspect the camshaft oil feed holes (1) to the camshaft position actuator for dirt, debris or blockage.
- Inspect the threaded hole (2) for damage.
- Inspect the camshaft position actuator locating notch (3) for damage or wear.
- Inspect the camshaft sealing grooves (4) for damage.
- Inspect the camshaft thrust surface (5) for damage.
- Inspect the camshaft lobes (6) and journals (7) for the following conditions:
• | Excessive scoring or pitting |
• | Discolouration from overheating |
• | Deformation from excessive wear, especially the camshaft lobes |
- If any of the above conditions exist on the camshaft, replace the camshaft.
Camshaft Measurement
- With the camshaft in a suitable fixture, measure the camshaft for wear.
- Measure the camshaft journals for diameter and out-of-round using an outside micrometer. Refer to
Engine Mechanical Specifications : LF1 .
• | If the diameter is smaller than specifications, replace the camshaft. |
• | If the out-of-round exceeds specifications, replace the camshaft. |
- Measure the camshaft runout using the GE 7872 indicator . Refer to Engine Mechanical Specifications : LF1 .
- Measure the camshaft thrust width for wear using a depth micrometer. Refer to
Engine Mechanical Specifications : LF1 .
- Measure the camshaft thrust wall surface for runout using GE 7872 indicator . Refer to Engine Mechanical Specifications : LF1 .
- If the camshaft is damaged or worn beyond specifications, replace the camshaft. No machining of the camshaft is allowed.
- Measure the camshaft lobes for wear using the GE 7872 indicator .
- Place the GE 7872 indicator with the indicator tip on the base circle (1) of the camshaft lobe.
8.1. | Place the GE 7872 indicator at zero. |
8.2. | Rotate the camshaft until the indicator tip is at the highest point (3) on the lobe. This reading is the lift of the camshaft lobe. Refer to
Engine Mechanical Specifications : LF1 . |
8.3. | If the indicated measurement is significantly lower than these specifications, replace the camshaft or engine performance will be reduced. |
© Copyright Chevrolet. All rights reserved |