edgewood bronco
Well-known member
600 miles and I've torn down my engine. 200 six bored 40 over. Giant bronzy flakes in the filter. No. 4 connecting rod is toasted. Second cam bearing also is boogered such that I can't get the cam out. I hope this will be a good opportunity to learn a thing or two and improve a few things as well. I noticed a couple things on the teardown (unfortunately I cannot tell you what brand of parts I was using. It was a fairly basic kit I sourced locally from my first machine shop):
Main bearings all looked like I just put them in. Filter was doing its job I guess. I did notice that the wear wasn't entirely even. There's a light aluminum color, and when that's rubbed off, it's a shade darker silver underneath.
Rod caps all looked good except for number 4, which was in the copper/bronze layer with chunks missing. That journal has a lot of chatter marks on it and is slightly brown in color.
Piston side of rod bearings were worn a lot more, bronze coming through in places. I get that there must be a lot more force on that side of the bearing because it's absorbing the shock of the combustion, but I'm a little concerned at that amount of wear already.
Second cam bearing had some nice gouges in it. Not sure why one would fail and the others not. Unless it was due to debris from the no. 4 connecting rod failure. but they're really not that close to each other. Maybe close enough.
This engine smoked after 500 miles, and I don't see how it could be related to bearing failure. When I took the headers off, cylinders 2 and 5 were wet and oily in the exhaust port. The other 4 were dry with light black carbon deposits. Makes me think 2 and 5 were causing the smoke, but why only 2 cylinders? I looked at the rings and I had them installed correctly. (dots on the correct side) What else can I check?
Looking ahead, what should I plan on doing to fix this? I figure replace all bearings, lifters, oil pump. Should I have them re-hatch the cylinders and put new rings in? Anything in the head?
Thanks.
Main bearings all looked like I just put them in. Filter was doing its job I guess. I did notice that the wear wasn't entirely even. There's a light aluminum color, and when that's rubbed off, it's a shade darker silver underneath.
Rod caps all looked good except for number 4, which was in the copper/bronze layer with chunks missing. That journal has a lot of chatter marks on it and is slightly brown in color.
Piston side of rod bearings were worn a lot more, bronze coming through in places. I get that there must be a lot more force on that side of the bearing because it's absorbing the shock of the combustion, but I'm a little concerned at that amount of wear already.
Second cam bearing had some nice gouges in it. Not sure why one would fail and the others not. Unless it was due to debris from the no. 4 connecting rod failure. but they're really not that close to each other. Maybe close enough.
This engine smoked after 500 miles, and I don't see how it could be related to bearing failure. When I took the headers off, cylinders 2 and 5 were wet and oily in the exhaust port. The other 4 were dry with light black carbon deposits. Makes me think 2 and 5 were causing the smoke, but why only 2 cylinders? I looked at the rings and I had them installed correctly. (dots on the correct side) What else can I check?
Looking ahead, what should I plan on doing to fix this? I figure replace all bearings, lifters, oil pump. Should I have them re-hatch the cylinders and put new rings in? Anything in the head?
Thanks.
