Valve Adjustment in ...Mania

[Rockitdoc]

Was reading in LavMania the procedure on valve adjustment again and noticed it says be sure when removing the cams there isn't any scratching or bluing on the cam lobes.  Scratching I understand, but bluing?  Meaning the cam lobe got hot?  What would bluing indicate? and, what effect would it have if reassembled that way?

Just curious.

 

[Grant]

Lack of oil due to too tight clearances.

 

[Rockitdoc]

Lack of oil due to too tight clearances.

Any danger in using such a cam?

 

[Grant]

Can't say, depends how bad it is.

 

[phil37]

It can make cam material soft - cause must be found before continuing - Regards - Phil

 

[AndyB_11]

Once it's gone blue there's a better than even chance of surface cracking which can lead to bits flaking off and going for a tour of the engine.

 

[Rockitdoc]

Once it's gone blue there's a better than even chance of surface cracking which can lead to bits flaking off and going for a tour of the engine.

I will recommend a new camshaft and bearings.  Better safe.