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TR6 TR6 crankshaft questions

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I

ichthos

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Hello,
I am currently rebuilding the short block on my 69 TR6. The machine shop stated that the crankshaft was in such poor shape that it was beyond tolerances and not worth fixing. He stated the PO didn't seem to believe in oil changes. Thankfully I had a spare from another 69 engine that was in great shape - I got lucky for once. I would like to find another crankshaft. How easy are these to find, and how can you tell if it is good or not? I don't think these are not available new, but what is the price for a good used crankshaft? Any help would greatly be appreciated.
Kevin
 
I've never bought just a crankshaft, they always had the rest of the motor attached. I would buy it locally as shipping would be nearly the price of the part. If the opportunity arises to buy an engine at a decent price, take advantage of it.

If you are building a new engine though, there shouldn't be a need for a backup crank for a long time.
 
I have a .020” under rod and main journal crank that I briefly ran in my 76 TR6. I also have the main and rod .020” bearings. The crank has less than 500 miles of run time. The reason for changing the crank was a scraping noise and vibration that ended up with the machine shop that resurfaced my flywheel returned it to me with the crank mount surface and the disk surface not in the same plane. I found out later that the shop had used a mill to resurface the disk area instead of turning. The noise and vibration was from the flywheel wobble movement. A second machine shop was able to correct the problem with the flywheel. As luck would have it, Moss at that time had a sale on crankshafts to deplete their inventory. Upon receipt of the new crankshaft the journals needed polishing from I guess being on the shelf so long. One of the rod journals had a ding as well. Moss gave me credit for the machine shop labor that I thought was outstanding on their part. That small gesture led to me purchasing from Moss as a single source only looking elsewhere if they did not have stock for the item that I was sourcing. I purchased the new crankshaft for less than I paid to machine my original. The crank was sprayed with WD40 and has been in the corner of my shop standing on end so it would not bend since removal. This was about 15 years ago...

Send me a PM if you are interested. I had not planned to sell the crankshaft but I have not had a need for it in the past 15 years. At one time I had thoughts of purchasing another TR6 but purchased a Healey instead. As soon as I get rid of it I will probably need one as luck usually goes… If I leave it standing in the corner I will never need it.
 
Unfortunately, if your spare engine is pre '72, the '76 crank will not work. Otherwise, you're in luck.
 
Thanks for the offer on the crank, but my car is a 69. I think the cranks changed a few times over production.
 
What are the obvious differences in the crank? I have a spare crank sitting here that is for a TR6 but I have no idea what year.
 
The tailshaft of the crank is longer on the early crankshafts. The flywheels are different as well to accomodate the longer tailshaft. An early flywheel will not seat properly on a later crankshaft and vice versa. I don't have any measurements on hand to differentiate the two but do know that paired crankshafts and flywheels can be swapped from early to late and late to early.
 
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