70 LT-1 bottom end pics. (What the hell?)

[Dennis D.]

Started out as a gasket change in a previous thread. Got the pan off and found this grey sludge. From????
20210530_153829.jpg

Pans in great shape other than the grey sludge. No metal bits in there. Just found this piece, what appears to be white plastic .
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All components look great. Pick up is clear, bores look good
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[Jim L.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Weeellll, that looks vaguely like there's water in the oil.

[Joe L.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Started out as a gasket change in a previous thread. Got the pan off and found this grey sludge. From????
[ATTACH=CONFIG]106588[/ATTACH]

Pans in great shape other than the grey sludge. No metal bits in there. Just found this piece, what appears to be white plastic .
[ATTACH=CONFIG]106589[/ATTACH]
[ATTACH=CONFIG]106590[/ATTACH]

All components look great. Pick up is clear, bores look good
[ATTACH=CONFIG]106591[/ATTACH]

[ATTACH=CONFIG]106592[/ATTACH]

[ATTACH=CONFIG]106593[/ATTACH]

[ATTACH=CONFIG]106594[/ATTACH]

[ATTACH=CONFIG]106595[/ATTACH]

[ATTACH=CONFIG]106596[/ATTACH]

Dennis------


The plastic fragment is likely shed from the camshaft timing sprocket teeth.

As far as the gray sludge goes, if you were to have it analyzed I think you might find it contains a high percentage of lead from the many years the engine used leaded fuel.

[Dennis D.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Samples packaged and ready to ship out to blackstone. Thanks joe

[Dennis D.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Though that might be a possibility too. No coolant loss, and it's more grey than the pics show.

[Joe L.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Though that might be a possibility too. No coolant loss, and it's more grey than the pics show.

Dennis------


It's also possible that it's from the high zinc oil you are apparently using. However, I lean more towards lead.

[Duke W.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Over the first life of my SWC I noticed a gray sludge build up at the bottom of the oil filter housing. I speculated that it might be lead oxide (a white solid) mixed with oil. I cleaned it out a few times, but it would build back up again. When I rebuilt the engine at 115K miles in the seventies it was very clean inside - no sludge build up of any kind other than that gray paste at the bottom of the oil filter housing.

Duker

[Mark F.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Samples packaged and ready to ship out to blackstone. Thanks joe

Hi Dennis,

Interesting post! I just looked at the "Sample Reports" on Blackstone's website https://www.blackstone-labs.com/^thextremely low, or non-detectable lead

[Dennis D.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Mark.....
I did write several notes about all of this in the sample q"s. Hopefully they'll respond, or better yet call. Will post results.

This is the oil on the motor. Generic pic in the other post.
20210531_111944.jpg

[Mark E.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Hi Dennis,

Your other post has a picture of the Brad Penn oil jug – is there a reason you are using motorcycle oil – if that container is what you are actually using?

Mark asks a good question. Could the unusual choice of green motorcycle oil and leaded gasoline be causing unusual build-up in the pan?

Try an automotive engine oil with the right level of P and Zn. Mobil 1 has several flavors with 1000 PPM or more of each. Duke and others have posted about using CJ-4/CK-4 oils. My LS5 uses M1, and its inside is squeaky clean after several years and thousands of miles.

And I wonder if the downside of leaded gas outweighs its benefit. Lead causes buildup on valves, spark plugs and other components, while most of our engines can run great on 93 unleaded.

[Mark E.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Dennis,

I saw your last post after entering mine. You might still see if you get better results with another oil.

[Mark M.]

Re: 70 LT-1 bottom end pics. (What the hell?)

I agree with the lead sawyers. Years ago you would see this when the pan was pulled off 50's 60's 70's engines. It looks like stiff gray paint. Over 40 years ago I asked an engine builder what this gray stuff is, and lead from fuel was his answer. Tetraethylead was the additive in gas back than and for aviation and racing currently. Very bad stuff for the environment. I've heard there's a new substitute that may be used soon to eliminate all leaded fuels in the US. I recently pulled valve covers off a 69 427 that has never been apart. The deposits were in low spots around the top of the heads. Has your engine been on a diet of leaded fuel?

[Dennis D.]

Re: 70 LT-1 bottom end pics. (What the hell?)

Dennis,

I saw your last post after entering mine. You might still see if you get better results with another oil.

Mark...
I used Rotella in my 70 L46. Didnt have this problem on oil changes, hadn't pulled that pan since I rebuilt in the early 90's.

Once the LT-1 is all buttoned up, putting Rottella in . See if it makes a difference.

[Ed H.]

Re: 70 LT-1 bottom end pics. (What the hell?)

For what it's worth: Valvoline VR-1 was reommended to me by the gent who built the engine. So far, so good!

https://sharena21.springcm.com/Public/Document/18452/18bdee61-0a7e-e711-9c10-ac162d889bd3/a61538b4-0cbd-e711-9c12-ac162d889bd1

[Dennis D.]

Re: 70 LT-1 bottom end pics. (What the hell?)

For what it's worth: Valvoline VR-1 was reommended to me by the gent who built the engine. So far, so good!

https://sharena21.springcm.com/Publi...2-ac162d889bd1

when i got the L46 in the early 70's I used Valvoline