new main bearing with copper color

[modok]

I don't think I ever saw a copper plated bearing,
But lead/copper alloy and bronze are common bearing materials with a moderate load capacity, often they are flash plated to protect them from corrosion.

The layer of bearing material is often .030 thick or more, so they can be manufactured in only one size....say .030 under ect, then bored later to create multiple undersizes and std. Or bored to size after installation.

This method fell out of favor for main and rod bearing 30-50 years ago, tri-metal and aluminum bearings being generally superior for high loads, but still used commonly today for camshaft bearings and timing gear bushings and so forth.

[motomwo]

I looked up the number stamped into the bearing back side (MB2392P)
and it is a clevite number. So tomorrow I will give their tech dept. a call and find out more info on the bearing. Included with the bearing box pictured was Clevite literature printed in Spanish.


Marty
_________________
1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs

1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs

[modok]

Yes that's a clevite number.
the P at the end means tri-metal
Specifically, according to catalog-
"Steel backed with an intermediate layer of copper-lead alloy and an electroplated lead-tin-copper overlay. Precision undersizes are not re-sizeable (material designation tm-1, tm-77, tm-112)"

so, the back side says the front side is plated, but it isn't.
So, indeed, not right.

[motomwo]

Glen,
Thank you for the info. Looks like I will be looking for another #2 main bearing.
Have you used Clevite bearing set MS822A (Std/std )before? The Clevite/Mahle tech guys are telling me the # 2 journal bearing in this set is steel back and inside full oil groove.

Marty
_________________
1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs

1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs

[modok]

No, I don't think I ever have, but I used the rod bearings in everything, until they ran out.
Clevite does not list any oversizes, now or in the past.

WAG it will say "made in mexico", but only a guess, lemme know!

[mark tucker]

the TM is tri metal, the p is passenger HP is for..high perfornmance witch also have a wider chamfer for bigger crank raidi and a diferent flash coating,and harder steel shells,Ive used a few hundrad sets of them...more than that...I still have quite a few sets of them and the price is rather high for them vs the P bearing.(probably 3x as high) I ferget the bearing code for resizable bearings..G 60? the over lays are extreamly thin.the babbit is usualy the thicker one...as I recall...so it can let the shit imbed into it... bearings have changed a lot for many applications over the years...I dont think so for these cars..

[volksworld]

got an autolinea case engine apart with very little mileage that was built by a hack...and the center main was worn down to the copper....saw this thread and got me wondering weather it had just started out all copper....went to the shop to double check...no, it had a normal grey babbit layer and was just worn through...steel back, groove on the inside, same # as yours...MB2392P...so i think you're missing a layer...i've never seen a copper one but all i've ever used were kolbenshmidt, glyco , metal leve and silverline

[[email protected]]

all this is why you should ignore the box PN and what it "should" be and just measure it.
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[motomwo]

[[email protected]]

it's fantastic that you are paying attention to critical details like this, good job!
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It's just advice, do whatever you want with it!

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[motomwo]

[modok]

thanks!
made in mexico
supply is limited

[mark tucker]

arnt all the centers fully grooved?

[Ebel]

Does the box say they are rod bearings?

[motomwo]

[Bugsy61]

Why don't you just slide the outer bearings on the crank, install the center main in the case and bolt together with plasti-gauge across the center split bearing. You'll know right away if the shell missed the last coating process, or if this a used bearing shell. Just did mine last night, took 15 minutes, and is almost fool proof.

[motomwo]

Bugsy, Thank you for the tip, your right that would be a quick way to measure the clearance.
I already installed that copper bearing in the case (torqued)and measured with a dial bore gage and the crank with micrometer and it has a clearance of .002.
I decided to buy a new set of main bearings as pictured above and move on with the build and those bearings all measure .002-.0025" clearance, perfect for me.

Marty
_________________
1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs

1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs

[AlteWagen]

No more available from the manufacturer. Got a message that they are planning a batch to be released in March, wonder if its true
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[motomwo]

That's what I was also told by the Mahle tech guys. When they do get them in I am going to stock up on a couple of extra sets.

Marty
_________________
1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs

1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs

[mark tucker]

might want to tell them to make them with only internal groves on all bearings.... 3/4 groove would be even better...