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Alan_Myers
Luke Skywalker
Offline
Hi all,
Well, I was pretty nervous buying a 40 year old crankshaft off eBay! Cost more to ship than to buy, but overall a very reasonable total.
Yesterday it arrived via UPS Ground... The replacement I plan to use in my TR4. The idea is to have it reworked and ready to go, along with a matching set of bearings, before the engine is even pulled so that the rebuild can be done as efficiently as possible.
I'm breathing a sigh of relief... This crankshaft is in surprisingly good shape! Must have come from a low mileage car, and one that was babied at that, with frequent oil changes and such. All seven journals have no detectable ridges or wear marks, are totally smooth.
Might even be able to use it "as is", but I'll reserve judgement until it's properly and completely checked out by a machine shop. I'm just using dial calipers, which seem to show everything within the "loose" tolerance, such as might be used in a race motor that doesn't get any break-in time.
Of course, this is a street car that *will* see normal break-in and it might be wise to go ahead and grind to .010" over on everthing anyway.
We'll see after the crank is more carefully miked by a shop and checked for any out of round too. (My good measuring stuff was stolen some years ago and never replaced since I'm not doing machine shop work any more.)
This crank will be going to a machine shop anyway. At a minimum, it needs to be cleaned inside and out, throughly crack-detected, modified for a "modern" rear oil seal and additonal flywheel bolts, then possibly have the journals hardened.
Questions:
What currently available main and big end bearings are folks using and recommending? Sources? I am finding a pretty limited selection out there for the 4-cylinder TR motor, mostly bi-metal although I've always heard a tri-metal bearing was better in this motor. In the old days, Vandervell (sp?) were the ones to look for, but they seem largely unavailable. Thoughts and opinions?
Assuming the crank gets reground, or maybe even if it doesn't, what do you think about hardening the journals, probably nitriding? Also, what do you think about shot-peening the rest of the crank, or any other process? Worthwhile?
Note: This motor should redline around 6000-6200 rpm once it's done. It's being built and set up more for low/mid range, such as autocross and street use, rather than a high revving, road race screamer (in which case I'd be saving up for a new billet crank$$$$haft).
Your thoughts, opinions and recommendations would be very much appreciated!
Cheers!
Well, I was pretty nervous buying a 40 year old crankshaft off eBay! Cost more to ship than to buy, but overall a very reasonable total.
Yesterday it arrived via UPS Ground... The replacement I plan to use in my TR4. The idea is to have it reworked and ready to go, along with a matching set of bearings, before the engine is even pulled so that the rebuild can be done as efficiently as possible.
I'm breathing a sigh of relief... This crankshaft is in surprisingly good shape! Must have come from a low mileage car, and one that was babied at that, with frequent oil changes and such. All seven journals have no detectable ridges or wear marks, are totally smooth.
Might even be able to use it "as is", but I'll reserve judgement until it's properly and completely checked out by a machine shop. I'm just using dial calipers, which seem to show everything within the "loose" tolerance, such as might be used in a race motor that doesn't get any break-in time.
Of course, this is a street car that *will* see normal break-in and it might be wise to go ahead and grind to .010" over on everthing anyway.
We'll see after the crank is more carefully miked by a shop and checked for any out of round too. (My good measuring stuff was stolen some years ago and never replaced since I'm not doing machine shop work any more.)
This crank will be going to a machine shop anyway. At a minimum, it needs to be cleaned inside and out, throughly crack-detected, modified for a "modern" rear oil seal and additonal flywheel bolts, then possibly have the journals hardened.
Questions:
What currently available main and big end bearings are folks using and recommending? Sources? I am finding a pretty limited selection out there for the 4-cylinder TR motor, mostly bi-metal although I've always heard a tri-metal bearing was better in this motor. In the old days, Vandervell (sp?) were the ones to look for, but they seem largely unavailable. Thoughts and opinions?
Assuming the crank gets reground, or maybe even if it doesn't, what do you think about hardening the journals, probably nitriding? Also, what do you think about shot-peening the rest of the crank, or any other process? Worthwhile?
Note: This motor should redline around 6000-6200 rpm once it's done. It's being built and set up more for low/mid range, such as autocross and street use, rather than a high revving, road race screamer (in which case I'd be saving up for a new billet crank$$$$haft).
Your thoughts, opinions and recommendations would be very much appreciated!
Cheers!
