10-30-2023, 02:41 PM | #1 |
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At a lost here
Hello gang, over the summer I noticed melted pieces of alloy in the oil pan during an oil change. I dropped the pan cleaned it out while changing out the failing fiber timing gear to an aluminum gear.
Fast forward and I removed the engine. Yesterday I pulled main caps and rod bearing caps. The babbitt looked good on all surfaces and the crank had no marks in the journals. Looking at the cylinder walls, there are no marks there either. Now I don't know if it could be something in the valve train? I'm not sure where else to look for where these melted pieces could have come from. Any ideas where I should look next? Thanks |
10-30-2023, 02:46 PM | #2 |
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Re: At a lost here
Are you certain it is not from the Main Bearing thrust surface on the block?
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10-30-2023, 02:48 PM | #3 |
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Re: At a lost here
Oh, that is a great point. I removed the crank but didn't think to look there, will check it out. Thanks!
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10-30-2023, 06:54 PM | #4 |
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Re: At a lost here
"What Brent said", other than that, I doubt it's a cam bearing, could it be from an earlier engine re-build whereas these pieces could have been overlooked and caught in a "sludgy" corner that someone overlooked? ( I know that is really "reaching")
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10-30-2023, 10:23 PM | #5 |
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Re: At a lost here
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10-31-2023, 06:21 AM | #6 |
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Re: At a lost here
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10-31-2023, 10:32 AM | #7 |
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Re: At a lost here
You mentioned it was melted alloy. It could have been some molten babbit that overflowed the mold when the bearings were last poured. The rebuilder could have missed it and it fell into the bottom of the pan below the windage tray when the engine was assembled and there it stayed until it came out during that oil change.
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10-31-2023, 11:44 AM | #8 |
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Re: At a lost here
There is no alloy in the valve train, and there are no cam bearings, it has to be babbitt.
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10-31-2023, 05:19 PM | #9 |
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Re: At a lost here
Okay, thanks all. Once I pull the crank again I'll confirm if it's the thrust bearing or not. If not, I will buy new gaskets and button it back up. The car is an older restoration and everything looks good inside. Can still see the honing marks inside the cylinders. So far I'm very grateful to see the condition if the babbitt. And there was no knocking heard when running. Hopefully this was just an exercise of learning more about my A than originally planned.
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10-31-2023, 06:20 PM | #10 |
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Re: At a lost here
Babbit melts over 400 degrees if it indeed is melted babbit..
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11-01-2023, 12:10 PM | #11 |
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Re: At a lost here
Better check it ! before its to late like this one.https://youtu.be/mDozmUS1GZY?si=dtKFS3TlCjfJNxL2
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11-01-2023, 04:53 PM | #12 | |
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Re: At a lost here
Quote:
Here is what I'm seeing. I pulled the crank again and the thrust bearing I believe looks good. I will order all new gaskets and a clutch alignment tool. Maybe replace the valve springs while I'm at it. I included some of the melted alloy I found that started this whole adventure. noboD, any ideas what else that could be from? |
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11-01-2023, 09:00 PM | #13 |
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Re: At a lost here
I'm thinking when they poured the mains some overflowed and stuck to the block and maybe and thru time showed up in pan
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11-02-2023, 06:11 AM | #14 |
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Re: At a lost here
I will second what Randall said.
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11-02-2023, 09:54 AM | #15 |
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Re: At a lost here
Those globs look like drops from a pour, like melted solder. They have no heat color or smearing due to shear from a bearing or something like that. I think Will N, Randall and nkminar are correct. My 2 cents.
When you reassemble, take a look in the oil pump screen to make sure no smaller pieces are trying to get into your pump. It would be a shame to have it apart this far and miss a piece of debris that could eat your engine later. |
11-02-2023, 02:30 PM | #16 |
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Re: At a lost here
The oilpump is a great recommendation Genebob. I had disassembled it after the fiber timing gear failed but I like the idea of checking one more time before placing the oil pan back in place. I also never thought about the lack of discoloration.
Thanks all, I feel much better moving forward. |
11-02-2023, 02:33 PM | #17 |
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Re: At a lost here
Another thought just came to me is they probably wouldn't have a flat side if they fell down into the oil filled pan.
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11-03-2023, 10:19 AM | #18 |
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Re: At a lost here
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11-03-2023, 11:17 AM | #19 |
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Re: At a lost here
have the material XRF examined to see what it is.
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11-11-2023, 03:10 PM | #20 |
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Re: At a lost here
Because of the dipper tray being so challenging to remove, it’s possible to have debris in the pan going unnoticed for a very long time. You may also check the condition of the rear labyrinth seal also…. Oops I see the photos of the seal now and that’s obviously in good shape. I expect the same as the others said this is just drops from pouring mains.
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