[TR] Crank shaft bearings,1965 TR4A

[Joel E. Justin]

Why would you want to rebuild an engine with an old, out-of-round crankshaft? The machine shop work to get it polished/ground and the block line-bored doesn't cost much and gives you good piece of mind that your rebuilt engine will last.

Specifically on bearings, I've used the King tri-metal bearings on all my rebuilds and have been happy with them. But they were all used on polished (and balanced) cranks and line-bored blocks.

Joel...

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From: asg123 at centurylink.net <asg123 at centurylink.net>
Sent: Thursday, October 3, 2019 8:24 AM
To: triumphs at autox.team.net <triumphs at autox.team.net>
Subject: [TR] Crank shaft bearings,1965 TR4A

Good day all.  Any experience or  recommendations for best bearings to use on an old, maybe not so concentric, crankshaft.   Mechanic/ friend has schooled me that a perfect, recently machined crankshaft can tolerate hard bearings that will last a long time without any need to conform to crankshaft irregularities.   An old out of round crank needs bearing material that is somewhat malleable and can embed into the irregularities but is so soft they usually don't last as long.   The old Clevite 77 bearings had both advantages of embeddability and a durable alloy.  However, it seems that those NOS bearings are now unavailable  I think I read that the King Bearings are the closest to them.  Thanks, Arnold
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