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MG TD TF 1500 - TF Bearing Artwork 3of3

Third pic

Lonnie
TF7211

LM Cook

Nice, but would be easier to see if you just attached #2 and #3 to #1 and just have one post.
efh Haskell

True but I believe the BBS only accepts one photo per post. Didn’t have time to PhotoShop all three photos into one image

Lonnie
TF7211
LM Cook

BBS has no limit. Lots of posts hold many pictures. Try it. Just bring up your first post and click "Upload", add picture #2, Submit, then do it again.

efh Haskell

Or make 3 posts in a row in the same thread instead of one post in three different threads.
Steve Simmons

Bingo Steve. That’s what I meant to do. Sorry guys.

Lonnie
TF7211
LM Cook



Hi Lonnie,

Just curious, what brand of bearings are these?

Hope your rebuild goes well.

Regards, Bill

WHTroyer

How many miles have those bearings done? I have seen this type of thing before and it was in good quality bearings. I had assumed it is just fatigue from very long (and hard) service. I think lack of oil would be a different "art work", perhaps with more of a melted or hammered look. I have a vague recollection of someone saying it is an indication of water in the oil but that doesn't sound right to me. Good luck with the rebuild.

Bob Schapel
R L Schapel

Usually the cause of cracking, often in a mosaic pattern and loss of areas of the lining is excessive dynamic loading or over heating causing reduction of fatigue strength: over-speeding causing imposition of excessive centrifugal loading.
These engines normally run at fairly high RPMs with no vibration dampening, heavy components and long strokes, contributing to high bearing loading, once the process of disintegration starts, it will continue to total destruction of the bearing and related components. There are other factors that can start the process such as, oil pressure, wrong type of oil for the particular operation such as racing and imperfections on the crankshaft. In very rare situations, never heard of it on these engines though, electrical grounding between block and crankshaft can cause pitting of the soft bearing surface.


PJ Jennings

I don’t know the brand of bearings.

Speedo showed 32000 mi when I bought the car Dec 2013. Speedo didn’t work. Don’t know how long it was broken.

Two owners each used it as a daily driver for a couple of years.

The car competed in a few parking lot auto crosses in the mid 60s but no full on racing history.

Cylinders are pitting from water. Did not have a TF-1500 head when I bought it. Water damage probably occurred before the head was replaced. Don’t know why the original head failed.

Lonnie
TF7211
LM Cook

From a relatively new member...
This looks like good old fashioned corrosion to me. As an engine builder I used to see a lot of it years ago. Most common with engines that have sat for a couple of years with dirty, contaminated oil caused by a build up of acids/water vapor as products of combustion. Properly configured PCV systems can help to aliviate this by burning the blow-by fumes which would otherwise condense and concentrate in the engine. Storing the vehicle at the end of season with fresh clean oil will help.
best,
John

https://www.waukbearing.com/en/technical-resources/bearing-damage-index/bearing-damage:-corrosion/
J Stone

Correct John.
Len Fanelli

This thread was discussed between 30/06/2018 and 08/07/2018

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