Triumph 750 engine tear down question. - Page 2

marksbonneville · 01-12-2012, 03:06 PM

OK the case is split but the crank is still in place of the right side case as I do not have a crank pinion gear puller or know of one in my area. Couple questions:
Any tips to removing the crank with the pinion gear installed without ruining the case? I could possible ruin the crank pinion gear and weld on a puller system but I hate to make the situation worse.
Anyone have a good used or rebuilt crankshaft laying about or know who would have one?

motu · 01-12-2012, 03:42 PM

The normal method is to smash it out with a hammer and then turn the crank back into shape on a lathe.

However I have a puller....

marksbonneville · 01-12-2012, 03:48 PM

Quote:

Originally Posted by motu

The normal method is to smash it out with a hammer and then turn the crank back into shape on a lathe.

However I have a puller....

I wasn't about to go to work on the crank (although its already trashed), I thought the crank bearing would pop out of the case with the crank? Then I could press off the pinion gear but I don't want to damage anything.

bmwrench · 01-12-2012, 07:45 PM

The crank usually pulls out of the bearing, and it takes some heat to remove the bearing. I don't think the pinion will fit through the hole in the case.

I think a repro of the pinion puller is available. PM me if you wish, and I'll check/.

motu · 01-12-2012, 10:24 PM

No, the pinion won't go through the case,it has to be pulled off. I've seen too many cranks trashed where people have just slammed away trying to smash it out. It's possible it could be done in a press, but I'd still be worried about damaging the case. Like a clutch puller, a crankgear puller is a must when working in Triumphs. I also have camgear puller and installers....but they aren't really a must, just nice to have.

marksbonneville · 01-13-2012, 11:09 AM

It looks like I'm going to have to order a puller, we have tried making one but the gear is being stubborn. Oh the joys of working on bikes.

Mark Manley · 01-14-2012, 09:13 PM

If you pull the crank pinion off the put the case and crank in the oven the bearing usually comes out with the crank, at least it does on mine. It helps to be unmarried before trying this procedure or it can result in serious injury and a large financial penalty.

marksbonneville · 01-21-2012, 01:50 PM

OK I ordered the pinion gear puller and pretty much its a waste of $$$ as it would not fit around the case, So I heated the case and the crank popped right out, I'll take it to local machine shop on Monday and press off the gear as the pinion puller is struggling even with the clearance it needed.. I have another crankshaft lined up and I need to order new bearings etc and then I can start putting her back together.
I appreciate all the tips and advice and other than the crank pinion its been an easy tear down.

smokeeater495 · 01-21-2012, 02:52 PM

Wes White of Four Aces Cycle makes a good DVD for rebuilding Triumph Twins. It was invaluable when I rebuilt a '68 650.

marksbonneville · 01-21-2012, 03:04 PM

Quote:

Originally Posted by smokeeater495

Wes White of Four Aces Cycle makes a good DVD for rebuilding Triumph Twins. It was invaluable when I rebuilt a '68 650.

Believe it or not I had rebuilt a couple of these but it has been many years and I forgot more than I thought. I do have my brother helping and he has done a few Norton rebuilds. Getting fresh ideas from others seems to generate some of the best help and your post reminded me I have the "building budget brits" book. which also reminds me I need to see if my VW crank gear puller will pull the right side bearing and gear off as one unit.........Thanks.

marksbonneville · 05-14-2012, 02:59 PM

I have a question regarding a shim (spacer) located behind the front primary sprocket up against the main bearing. My factory parts manual does not show one, my Haynes manual list it as an oil seal, and I honestly do not remember whether or not I removed this shim during disassembly but I "think" one was there. Any help would be appreciated.

concours · 05-14-2012, 05:21 PM

Quote:

Originally Posted by marksbonneville

I have a question regarding a shim (spacer) located behind the front primary sprocket up against the main bearing. My factory parts manual does not show one, my Haynes manual list it as an oil seal, and I honestly do not remember whether or not I removed this shim during disassembly but I "think" one was there. Any help would be appreciated.

Get a proper factory workshop manual here: http://www.classicbike.biz/Triumph/Repair/Repair.htm It should explain the purpose of the shim, and how to calculate it

marksbonneville · 05-14-2012, 05:28 PM

My mistake I should have added I also have the factory manual and it makes no mention of the shim. I'm actually looking for someone who has specific knowledge on the late unit twins.

Concours thanks for the link anyhow.

Mark

FR700 · 05-15-2012, 12:52 AM

The shim is to align the primary drive sprocket with the clutch basket . Various thicknesses .

.

marksbonneville · 05-15-2012, 04:58 PM

Quote:

Originally Posted by FR700

The shim is to align the primary drive sprocket with the clutch basket . Various thicknesses ..

I checked rechecked and checked again and with the shim polished/cleaned up a tad the primary drive and clutch basket are in line. Thanks for the help and I hope to have her back on the road soon.

01-12-2012, 03:06 PM	#16
marksbonneville ^OP Studly Adventurer Joined: May 2008 Location: Arizona, Prescott more less. Oddometer: 936	Update OK the case is split but the crank is still in place of the right side case as I do not have a crank pinion gear puller or know of one in my area. Couple questions: Any tips to removing the crank with the pinion gear installed without ruining the case? I could possible ruin the crank pinion gear and weld on a puller system but I hate to make the situation worse. Anyone have a good used or rebuilt crankshaft laying about or know who would have one?

01-14-2012, 09:13 PM	#22
Mark Manley Somewhere else Joined: Apr 2010 Location: Heading East Oddometer: 373	If you pull the crank pinion off the put the case and crank in the oven the bearing usually comes out with the crank, at least it does on mine. It helps to be unmarried before trying this procedure or it can result in serious injury and a large financial penalty. __________________ If it's in the Touratech catalogue then you don't need it No man is an island, except for the Isle of Man

01-21-2012, 02:52 PM	#24
smokeeater495 Studly Adventurer Joined: Oct 2008 Location: N.E. Indiana Oddometer: 500	Wes White of Four Aces Cycle makes a good DVD for rebuilding Triumph Twins. It was invaluable when I rebuilt a '68 650. __________________ Harley, been there done that. Don't want to be a pirate.

05-14-2012, 02:59 PM	#26
marksbonneville ^OP Studly Adventurer Joined: May 2008 Location: Arizona, Prescott more less. Oddometer: 936	Triumph Twin Experts I have a question regarding a shim (spacer) located behind the front primary sprocket up against the main bearing. My factory parts manual does not show one, my Haynes manual list it as an oil seal, and I honestly do not remember whether or not I removed this shim during disassembly but I "think" one was there. Any help would be appreciated.

05-15-2012, 12:52 AM	#29
FR700 Heckler™©® Joined: May 2007 Oddometer: 3,459	The shim is to align the primary drive sprocket with the clutch basket . Various thicknesses . . __________________ I'm diagonally parked in a parallel universe .

01-12-2012, 03:42 PM	#17
motu Loose Pre Unit Joined: Dec 2001 Location: New Zealand Oddometer: 3,950	The normal method is to smash it out with a hammer and then turn the crank back into shape on a lathe. However I have a puller....

01-12-2012, 07:45 PM	#19
bmwrench Beastly Adventurer Joined: Nov 2006 Oddometer: 1,462	The crank usually pulls out of the bearing, and it takes some heat to remove the bearing. I don't think the pinion will fit through the hole in the case. I think a repro of the pinion puller is available. PM me if you wish, and I'll check/.

01-12-2012, 10:24 PM	#20
motu Loose Pre Unit Joined: Dec 2001 Location: New Zealand Oddometer: 3,950	No, the pinion won't go through the case,it has to be pulled off. I've seen too many cranks trashed where people have just slammed away trying to smash it out. It's possible it could be done in a press, but I'd still be worried about damaging the case. Like a clutch puller, a crankgear puller is a must when working in Triumphs. I also have camgear puller and installers....but they aren't really a must, just nice to have.

01-13-2012, 11:09 AM	#21
marksbonneville ^OP Studly Adventurer Joined: May 2008 Location: Arizona, Prescott more less. Oddometer: 936	It looks like I'm going to have to order a puller, we have tried making one but the gear is being stubborn. Oh the joys of working on bikes.

01-21-2012, 01:50 PM	#23
marksbonneville ^OP Studly Adventurer Joined: May 2008 Location: Arizona, Prescott more less. Oddometer: 936	OK I ordered the pinion gear puller and pretty much its a waste of $$$ as it would not fit around the case, So I heated the case and the crank popped right out, I'll take it to local machine shop on Monday and press off the gear as the pinion puller is struggling even with the clearance it needed.. I have another crankshaft lined up and I need to order new bearings etc and then I can start putting her back together. I appreciate all the tips and advice and other than the crank pinion its been an easy tear down.

05-14-2012, 05:28 PM	#28
marksbonneville ^OP Studly Adventurer Joined: May 2008 Location: Arizona, Prescott more less. Oddometer: 936	My mistake I should have added I also have the factory manual and it makes no mention of the shim. I'm actually looking for someone who has specific knowledge on the late unit twins. Concours thanks for the link anyhow. Mark

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