Can you advise best way to get may crankcase (without cylinders) back into my 850 frame?

DennisMo · 2026-04-19T16:59:10-0600

It has been a while since I pulled crankcase out and I forget how I wrestled it out given the front isoelastic.
Photo below has front isoelastic loosely in place just so I can see the scope of the problem. I suspect it has to
be loose but hope to get your advice to make the install very quick!!
Thanks so much
Dennis

Can you advise best way to get may crankcase (without cylinders) back into my 850 frame?

possm · 2026-04-19T19:17:13-0600

Remove the front isoelastic, fit the crankcase to the rear cradle then refit/adjust the front isoelastic.

DennisMo · 2026-04-19T21:28:36-0600

It is a vernier isoelastic which I installed one I got the bike. It was very very very difficult to install with the engine bolted in place at rear so is there a way
to make it a lot easier.
Dennis

Mark Savage · 2026-04-20T00:01:25-0600

Without the barrels and head fitted you’re able to attach the front iso to the crankcase and fit it as one.

dobba99 · 2026-04-20T02:22:13-0600

The front iso is upsidedown

olympus · 2026-04-20T03:04:18-0600

Hi Dennis, when i read this post last month i thought at the time what a brilliant way of getting the fully rebuilt motor back in
www.accessnorton.com/NortonCommando/head-installed-on-the-bench-then-motor-into-the-frame-it-can-be-done.41361/

DennisMo · 2026-04-20T08:24:33-0600

Thanks about the front iso. I caught that later when I looked at the crankcase front bolt pattern.

grandpaul · 2026-04-20T09:05:29-0600

Mark Savage said:
Without the barrels and head fitted you’re able to attach the front iso to the crankcase and fit it as one.

Does make a bit of a fiddle getting the head in place, but yes, that works.

DennisMo · 2026-04-20T17:31:42-0600

Thanks to all for your help. It is installed. I did get set back when the isoelastic bolt hole would not line up and was an inch away.

Then I realized that I needed to put weight on the engine and push the engine frame down relative to the bike frame

Thanks again.
Dennis

Can you advise best way to get may crankcase (without cylinders) back into my 850 frame?

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