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Old 03-18-2004, 03:18 AM
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Cam button question?

I just finished assembling my roller cam sbc and happened to see a few posts about roller cams tendency to walk. I'm using a gear drive that uses a bronze thrust washer behind the sprocket and a cam button in front. I'm using a pretty stout timing chain cover with a reinforced area where the button butts up against. I remember when I installed the cover and checked the cam movement there was essentially none and didn't think this was an issue. Will this result in grinding the front of my cover away? Should there be some clearance here? Is this going to be a problem or is this only crucial using a Torrington type thrust bearing I've heard some mention they use?

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Last edited by Marcus; 03-18-2004 at 03:25 AM.
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Old 03-18-2004, 07:43 AM
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If it is a chrome cover, it won't last. That is Asia stamped stuff and the cam will eat through it. We always welded a small reinforcement plate inside. You should have a little play, about .006". Check with Machine Shop Tom, but the best of my memory that is about right.


Chris
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Old 03-18-2004, 08:02 AM
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end play

.006" to .008" end play is right. I have run them up around .010" with no problems. If you have no end-play at all you will need to take it apart and fix that. Some cam buttons have shim in them. You can remove the snap ring on the front and remove a shim and then re-check it. I would look real close at your set-up because everyone that i have done has had way to much end play..... and needed shim to reduce the amount.

As Chris stated if it's an off shore cover it will be through it in no time.....

Keith
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Old 03-18-2004, 09:07 AM
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You may want to think about installing an aluminum cover while you have it apart. You can get them these days for about $25-30, they are much stiffer and thicker, no flexing.

I agree you MUST have some end play.

Royce
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Old 03-18-2004, 01:27 PM
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I'm actually using a pretty stiff aluminum cover and the cam button is not a solid type but one that spins (for want of a better term) so I figure if there is no end play then this will stop it from eating thru the cover. What do you think? I really don't want to take it apart again
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Old 03-18-2004, 02:52 PM
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No it has to have the play. If it has no clearance, the cam will eat through the cover.

Chris
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Old 03-18-2004, 03:01 PM
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I agree with what Chris said. You have to have some play, regardless of what type of thruse bearing you have. .006" is a good figure.
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Old 03-18-2004, 05:57 PM
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I agree, if you have no end play that little cam button "bearing" is going to hat up and self distruct it was desinged to have some play. It is not worth taking the chance.

Royce
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Old 03-18-2004, 09:59 PM
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Thanks for the responses...I guess I'm going to have to remove the timing chain cover and get some end play there.
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