Wednesday, February 8, 2012

How to Inspect Camshaft?

First know what is Camshaft.
The camshaft is a shaft having lobes driven by the crankshaft via gears, chains, or belts that, in turn, opens and closes the intake and exhaust valves at proper intervals.
See below how it looks :----


Now follow the camshaft inspecting procedure:-----

The camshaft is driven by the crankshaft by one of three methods:
  • Gear drive
  • Sprockets and timing chain
  • Sprockets and timing belt
Camshaft parts. 
  • Check the camshaft for:
    • A plugged oil feed,
    • The correct cam lift or
    • Any broken or severely worn areas.
  • Check each lobe and journal for:
    • Scoring,
    • Scuffing,
    • Fractured surface,
    • Pitting,
    • And signs of abnormal wear.
Steel camshaft and roller followers in good condition.
Badly burned and worn camshaft bearing bores.
Normal lobe wear is a pattern slightly off center with a wider wear pattern at the nose than at the heel. The off-center wear is a result of the slight taper of the lobe used in conjunction with the convex shape of the lifter to rotate the lifter.

Normal wear patterns are slightly off center on the lobe. 
  • If the wear pattern extends to the edges of the lobe, the lifter will not rotate.
  • If there is any scoring or galling, the camshaft will have to be replaced or reconditioned.
Premature lobe and lifter wear is generally caused by metal-to-metal contact between the cam lobe and lifter bottom due to inadequate lubrication. The nose will be worn from the cam lobes, and the lifter bottoms will be worn to a concave shape or may be worn completely away.
This type of failure usually begins within the first few minutes of operation. It is the result of insufficient lubrication.

This will help you to inspect the cam shaft on your car.

Thanks.

See below latest solved car problems :-----

Crankshaft and camshafts timing marks for Saturn Vue?

http://technoanswers.blogspot.in/2012/02/crankshaft-and-camshafts-timing-marks.html


Camshaft, Bearings & Lifters Replacing on Honda Odyssey?

http://howtobyme.blogspot.com/2011/12/camshaft-bearings-lifters-replacing-on.html






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