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Author Topic:   a couple small scratches on cam bearing... uh oh
posted June 10, 2004 08:06 PM           
OK... just started taking apart my new (used) motor to freshen it up a bit.

I took the cam out to find out what exactly it was... its a comp cams 280H... but thats beside the point..

What I discovered after removing the cam was that there were a couple small scratches in the front cam bearing.. nothing too deep, but you could feel them if you rub your finger along the bearing surface.

The cam itself looks good and I can't feel any scratches in it.

So... does this REALLY need replacing? Or will it be OK? Any good suggestions on and inexpensive fix that will do the job?

On a side note... I may have done this damage myself when removing the cam.. Is there a better way to remove it? I just pulled it out by hand as carefully as possible.


posted June 10, 2004 09:17 PM
If you are questioning the cam bearing at all I would have it replaced. You have the engine tore down anyway. I wouldn't tell you to run it without seeing it first. maybe bring it to the machine shop and let them decide.

posted June 10, 2004 10:43 PM
Sal, if you have the cam out, take it to a shop and have them change the cam bearings, this is fairly cheap to have done. I wouldent chance it. The rest of the bearings should be fine the motor had good oil pressure when pulled out.

posted June 11, 2004 02:51 PM           
ok.. i'll probably change them.... chances are I damaged them myself when I pulled the cam. How do you guys pull it? I suppose it would be easier if I had the motor upside down with the crank and pistons out so I can hold the other end and guide it. Is that the preferred method? Or do most of you just yank it out (carefully) from the front?


posted June 11, 2004 03:20 PM
It is easy to determine if you scratched it. If the scratch runs lengthwise, you scratched it. If it is a rotational scratch, then it was caused by a foreign object. I would rub it gently with some fine sandpaper and wipe it out good and not worry about it. A loss of a very small area of bearing surface on a cam bearing will not hurt you at all and replacing cam bearings on a motor that still has it's internals in it can be quite tricky to get the oil holes lined up. Just be careful not to let sanding debri get in engine. Being the front bearing I would put a vacuum cleaner hose next to it while sanding then wipe it with a clean rag soaked with oil to get the debris to stick to the rag.

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