Triumphrat

Miller261

I've hit a new wall in my TR7 engine rebuild.

I tried to put my case halves together today. I started by introducing the crank to the drive side case (per Hughie Hancox's DVD), then attempted to mate the drive side case and crank with the timing side. Unfortunately the crank shaft would not fully insert into the timing side main bearing, and the gasket sealer dried too much (I think...). There was a little more than half an inch to go before it was fully home. Now, I can't get it all back apart because the shaft seems stuck in the timing side bearing. Before I figure out why exactly it's not going together, I need to get this thing apart. I gave each end of the crank shaft some firm whacks with a plastic mallet with no success.

I'm using ThreeBond 1104. Anyone know how long my window of opportunity is to get the cases joined up? The tube says dry for approx one minute before joining. That's a pretty small window...

Thanks for helping out.

Miller261

Never mind! I got it apart. What a pain in the butt.

I warmed it up a bit and hit with more resolve from the timing side. Eventually it came apart. My worry was that the bearing would come out with the shaft, since I obviously have too much interference between the journal and timing side MB. Luckily the bearing is still seated ok.

Thanks.

Mr.Pete

I'd recommend using the 3-piece roller bearing on the timing side.It's a stronger bearing,and it makes assembly very easy.
You can also easily check end-float before the crank pinion is tightened.
I use Loctite 515 sealant.It will not set until the cases are closed.

Miller261

Thanks, Mr Pete.

Can you send me a link or two to the bearing?

Mr.Pete

The Triumph part number for the bearing is 60-7362.
RHP bearing number NUP 306 ETCN.
CN only refers to "normal" internal clearance.

You might find this interesting too;http://www.triumphrat.net/classic-vi...f-t140v-3.html

Miller261

Got it together yesterday with the standard ball bearing. My method: I polished the crank shaft journal more thoroughly, knocking down a little booger (almost undetectable to the eye and finger) with some fine emery. I staged all my hardware. I lightly heated the timing side case and bearing until the bearing had obviously expanded. I spread the Three Bond as neatly and expeditiously as possible, moved quickly, and voila. Everything is together and turning exactly as it should.

Yes, that thread is very interesting.

I am lucky because this low-mileage motor had never been apart before I dug into it, so I got to see exactly what it looked like from the factory. I have been taking my time, taking copious pictures and notes, and sparing no expense on parts. Here and there I have found deviations from the parts book and workshop manual, but I trust the way it was together before I trust the diagram.

lovecuba

Followed your procedure, using a little heat also, c/shaft entered timing bearing with a little rubber hammer persausion, all good and buttoned up nicely.

Miller261

Great! Did you use the 3 piece bearing or the standard one?

lovecuba

Used a heavy duty (11) ball bearing.

loxx101

May as well stick my $0.02 here.

Heating up casings/hitting them hard can warp them causing leaks. Worse than that, hitting a casing over a bearing could damage them. To the untrained hand, it'll feel fine. It could fail earlier than you would hope.

Always do everything gently. If you need to hit it, there's a good chance something isn't right.

If you DO need to force it in, use a press.