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Old 08-11-2010, 03:46 PM
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cam bearing replacement

i know this is probally a dump question,is a given to replace cam bearings when replacing a cam.this is a87 motor with 125,00 miles.please don't blast me just asking..thanks joe..

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Old 08-11-2010, 03:53 PM
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What a stupid question Always replace cam bearing cause they're hard to measure and inspect.
And, always use the trimetal type bearings from Clevite or Durabond.
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Old 08-11-2010, 04:02 PM
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the reason i asked is because they never suggest replace bearings or offer a set to go with cam.
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Old 08-11-2010, 04:15 PM
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I don't see why you would have to really. You never hear about a severe engine failure because of a bad cam bearing. As long as they look alright i say you're good to go. But that's just my opinion.
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Old 08-11-2010, 04:29 PM
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Its a good idea if the engine is getting torn down that far anyways.......big clearances in the cam bearings cause lower oil pressure to the top end
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Old 08-11-2010, 05:03 PM
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thats kinda what i thougt.if i go that far why not play it safe..
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Old 08-11-2010, 05:34 PM
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Yes if the engine is out and tore down i would go ahead and re-place.
I have changed cams before and not change the cam bearings with no problems at all. But if i have it out and looking at me i change them. Joe are
you planning on changing the bearings yourself or a machine shop? Reason i ask you must be careful and make sure the bearings are in correctly and it takes a special tool to install the bearings. Also just to add a note i have seen some pretty bad cam bearings before on engines that you would not expect them to be bad.



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Old 08-11-2010, 06:13 PM
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i'am looking to have machine shop replace them,not something i'am comfortable doing myself..
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Old 08-11-2010, 07:51 PM
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Quote:
Originally Posted by hemi joe
i know this is probally a dump question,is a given to replace cam bearings when replacing a cam.this is a87 motor with 125,00 miles.please don't blast me just asking..thanks joe..
Cam bearings don't see much wear, unless you're doing a major rebuild with the block stripped bare you almost can't even get to them. They are knocked out with a hammer driven tool, with the engine assembled they will fall into the crankcase requiring removal of the pan to get them out. Replacements are pressed in with a specific order, with the crank assembly in the block it is nearly impossible possible to do this and insure alignment of the bearing shell on it's bore and that no metal has been peeled off where it will get into the lubrication system. This can be done but it takes a lot of finesse by a person with some experience, I would not recommend it for the home builder.

At major rebuild time one would expect to remove them not so much for wear but because the cleaning process will dislodge gunk and dirt than can be trapped behind them in the groove that circulates oil to the main bearings. Additionally some cleaning processes use heated caustic liquids as found in the hot tank process which will dissolve away the bearing surface material leaving only the steel backing, thus ruining the bearing.

For a cam replacement no action on the cam bearings is required. Just be careful not to nick them up getting the cam out and in. A tool is sold for this purpose which is really nothing more than a bolt on handle to help you guide the cam so the lobes don't catch on the bearing edges.

Bogie
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Old 08-11-2010, 08:13 PM
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Quote:
Originally Posted by hemi joe
i know this is probally a dump question,is a given to replace cam bearingsust p when replacing a cam.this is a87 motor with 125,00 miles.please don't blast me just asking..thanks joe..
I would not disturb the cam bearings . If you have good oil pressure and you dont chew up the bearings putting in the new cam you should be fine.
Cam bearings do wear like all the other bearings in the engine so allways replace them on a rebuild.All the bearings in your engine have the same amount of wear so it should oil evenly. Tightening clearances in one set of bearings and not across the board inside the engine could cause an oil starvation problem and possible failure. Keep it simple. There are no stupid questions and its nice to be important... but its important to be nice
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Old 08-11-2010, 08:40 PM
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thanks to all for your imput.all suggestions and imput is always appreciated,thanks joe...
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