TR2/3/3A TR3 Crankshaft Options

My TR3 engine is out, the machine shop has not had time to fully evaluate the engine, but for sure the crankshaft is broken in two...So while I am waiting for the machinist's opinion, I would like to find out from you guys what my options and approximate costs might be for a replacement crank. Thanks!

I don't know of anyone making new ones at a reasonable price. There are a few racing crankshafts available (eg Moldex), but last I heard they were upwards of $7k ... probably $10k by now.

Fortunately, used originals should be relatively available. I haven't paid too much attention to current prices, but I think you should be able to find an original for well under $500, especially if it hasn't been reconditioned yet.

If you can't, write me off-list and maybe I'll pry one out of my hoard. I actually tried to give away an engine a few years back that had a good, never-turned crank in it, but got no takers. (But it's no longer available, now that I've found storage for it.)

RedTR
In what part of sunny CA are you located?
Pat

Hi Pat,

I am in Walnut Creek (SF Bay Area).

I sent you a PM

don't know of anyone making new ones at a reasonable price. There are a few racing crankshafts available (eg Moldex), but last I heard they were upwards of $7k ... probably $10k by now.

Click to expand...

!!!! Last I heard they were in the $2k-3k range.

Monkeywrench said:

!!!! Last I heard they were in the $2k-3k range.

Click to expand...

Yep the last billet crank I bought from Moldex was back about 2004, and it was for MG/AH 948, and it was about $1800 retail, I'm sure other examples may be higher, but I agree with Bob, I doubt any new Moldex billet crank for one of our 4 cylinder engine would be over $3000, but that would be over kill for street engine. I'd say keep digging around to find a good used crank, this stuff doesn't grow on trees, but it's out there, if you really look, we snagged a GT6 crank last week off Ebay for a whopping $45 plus shipping, and the crank turned out to std./std. and a great piece, so deals are out there.

There are 4 TR3/4 crankshafts for sale on Ebay right now, some already been magnafluxed, and ground, ready to go, then a couple other unmolested std./std., but probably, or may need to be ground to .010/.010.

Here they are:

https://www.ebay.com/itm/Profession...Parts_Accessories&hash=item46114d8522&vxp=mtr

https://www.ebay.com/itm/TR2-TR3-TR...Triumph|Model:TR3&hash=item2c65d2d7b9&vxp=mtr

https://www.ebay.com/itm/Triumph-TR...Parts_Accessories&hash=item4d0ff480b6&vxp=mtr

https://www.ebay.com/itm/TR2-TR3-TR...Parts_Accessories&hash=item484b580833&vxp=mtr

I've got several cranks all ready out and checked. $200 and shipping

Marv

Update...The machinist has the engine apart; luckily only the crank broke and no other damage to any other part of the engine.

I suggest sending it off for nitriting(a hardening process).then machine,polish and balance.
The last tr motor I did had rods/pistols that were 30 grams different, this must be addressed
or it will break another crank.Lastly the flywheel needs to go on a diet and be balanced.I like 24 lbs as this was what the tr2 used with
good results.
MD(mad dog)

Marv, I sent you a PM.