cam bearing came loose

1972....timing side
I discovered the bearing has been loose for quite a while. Fixing the problem requires an oversize bearing, is there one? I've never seen this bushing come loose.
If not I can make one. What material to use...bronze xxxx.

You might be able to buy a "speedy sleeve" and use the stock bearing. Insert it in a bearing retaining fluid that is used to secure races in place when the recess is beyond tolerance.. If the casting is damaged, it might work ok just being hand reemed, but the best repair would rebore the damaged recess to the sleeve size to make sure it's centered. The real trick would be having a set up that gets the rebore right.

o0norton0o said:

You might be able to buy a "speedy sleeve" and use the stock bearing. Insert it in a bearing retaining fluid that is used to secure races in place when the recess is beyond tolerance.. If the casting is damaged, it might work ok just being hand reemed, but the best repair would rebore the damaged recess to the sleeve size to make sure it's centered. The real trick would be having a set up that gets the rebore right.

Click to expand...

that's what I'm afraid of.

seattle##gs said:

1972....timing side
I discovered the bearing has been loose for quite a while. Fixing the problem requires an oversize bearing, is there one? I've never seen this bushing come loose.
If not I can make one. What material to use...bronze xxxx.

Click to expand...

Get two 06-5425 (MK3 style timing side).

Chances are good that one will fit tight and the other can use bearing mount. BTW, if the bushing is not in good shape I replace with these on all builds - there is then a thrust surface on both sides.

I'm guessing that they oilite but sintered bronze should work well. I'm no metallurgist so others may disagree.

seattle##gs said:

that's what I'm afraid of.

Click to expand...

post a picture of the damaged recess..

I believe I need the 06-5428 with the flange. I measured the hole in the case and it appears it's still 1"..hard to believe. There is .011 clearance now and it all came off the brass bush. I'm taking the case down to the machine shop for better measuring. I can only measure the first 1/4 inch.
Also, the 6 cylinders I was given are all poor due to various problems. I hate to throw them out but they aren't worth keeping.

I thought speedy sleeves were for worn shafts, not worn bores??

seattle##gs said:

1972....timing side
I discovered the bearing has been loose for quite a while. Fixing the problem requires an oversize bearing, is there one? I've never seen this bushing come loose.
If not I can make one. What material to use...bronze xxxx.

Click to expand...

I've used AmpCo-18

.011 or .0055? Seems a bit tight to me. Anyway, you know what's involved in making a new one, it's not really a complicated job, but Ampco 45 is pricey, a good alternative is 954 bronze which is readily available (and cheaper) If you have a mill, what I've done with good results is to bolt down the primary side case and mic off that side's bushing, then bolt on the timing side case and just touch off the bore to ensure it's concentric and not bell mouthed (your description of the bush's wear makes me wonder if its spinning caused bell mouthing of the bore), you now have a parallel bore that's "lined" to the opposing bearing and can turn up a properly fitting bush for it

acadian said:

..............but Ampco 45 is pricey, a good alternative is 954 bronze...............

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Yes, it can be pricey. I hunt for remnants on eBay like this;
https://www.ebay.com/itm/405813276612?_skw=ampco+18+remnants&itmmeta=01K0Y61QXR5XMJMYD6R9XG6JW0&hash=item5e7c5b2fc4:g:gsgAAOSwU6JoDZQe&itmprp=enc:AQAKAAAA8FkggFvd1GGDu0w3yXCmi1ffTU85oZIvvJQzz2reOkCx+w1AuxKypnBNXe3yOCQRIQ9iPqxyopXB+UjtYu1ks0y1zsls9lB5ZOwHhpnINqP8o9Msts7TMpIFVtlAFwIAPhWlR89bTOu5Xxfy6/Wvf9RmEPKzWAcHpdVdLUJG34MBrEtcaRYOJVMEf73esd3awlQuBG3HvuVMqpzIpvqONHslnIDJp4jYYFQ3otxI/gj3Lw38aZ1ugHiwSUjcl8v5cITNFdRhymlVojBPvcZFmsQOGLmtTJCgW1O+wRB82zAB21upa/a0Xq6oSRbg7FqkPw==|tkp:Bk9SR4z_hsaHZg
and there is a lot of 954 listed as well;

seattle##gs said:

If not I can make one. What material to use...bronze xxxx.

Click to expand...

660 bronze, or C86300 Manganese Bronze.

660 is a good material. 660 needs a finer honed grit than C630 or C86300. I would finish with a 400 to 600 grit hone, where with C86300 I would finish with a 320 to 400 grit hone. Personally I would then use a dry film coating on the bushing after I did my finish hone.