Tech quicky: low buck cam bearing reem

Once in awhile when you install new cam bearings or have someone else do it for you the bearing gets a burr. Or the block can be off .001 or so, or the bearing can even be off a little. Or any of the above.

When you slide the cam in it doesn't go. Just reaches a point and stops. So ya get a bigger hammer. Right?
NO, NO, NO, never force a cam., or any other part for that mater.
Get a look at the problem then go looking for a high dollar machinist to cure it.

Or, you can make a backyard tool out of an old camshaft. What you need is access to an old cam (like the one you pulled out of the block), and a die grinder, or bench grinder if you're real careful.

 

First find the offending bearing, it'll be the one with the ring around it from trying to slide the cam in. Then take the old cam, and grind a notch across the journal that won't slide through the bearing. Make sure that the notch has a sharp/cutting edge on it. De-burr it with a piece of emery cloth or sand paper.

 

Next pic please

 

Now carefully install the camshaft/reamer until it reaches the bad bearing. Take a wrench and start to turn the ream from the timing gear end (bolts installed). Slowly work the ream through the offending bearing gently, don't force it. It'll take some time, but the results can be very impressive.

Now try the new cam. If it fits then you have made a tool that you can use over and over again.

Remember this is not an every rebuild occurrence. But it does happen on occaision.

Note: don't forget to clean the chips out of the block, and remember always pre-fit everything before you start ***embly.

Have fun,
The PknBner

 

One tip: Add a bunch of lube so it doesn't gall up while you're cutting.
Paul