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Where to start #481145
03/13/13 5:53 pm
03/13/13 5:53 pm
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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A friend of mine just bought a 1976 Bonnie OIF. The rest of the bike is in really nice condition, but as you can see some major motor work is required.










Art

Last edited by bmwr90s; 03/14/13 10:04 am.

1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
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Re: Where to start [Re: bmwr90s] #481170
03/13/13 10:13 pm
03/13/13 10:13 pm
Joined: Oct 2006
Posts: 2,390
Elburn, Ill. USA
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Irish Swede Online content
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Posts: 2,390
Elburn, Ill. USA
WOW! The former owner really crapped that one!
I wonder if he learned anything from it, like:
push-rod engines don't like revving to 12,000 rpm.

Re: Where to start [Re: Irish Swede] #481184
03/13/13 11:23 pm
03/13/13 11:23 pm
Joined: Nov 2008
Posts: 2,712
Bishop, Calif.
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desco Online content
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Bishop, Calif.
Tear it down the rest of the way to check out the cams and crank.
Timing side and drive side check out OK?
Hope your buddy didn't pay to much for this. It ain't gonna be cheep.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: Where to start [Re: desco] #481189
03/13/13 11:54 pm
03/13/13 11:54 pm
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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I'm going to help him tear it apart in the morning. He's a retired classic car restorer and not familiar with motorcycles at all, I'm not at all familiar with Triumphs except for my TR25w. I'll post pictures as we tear it down.

Art

Last edited by bmwr90s; 03/13/13 11:55 pm.

1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: bmwr90s] #481200
03/14/13 1:40 am
03/14/13 1:40 am
Joined: Nov 2008
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Bishop, Calif.
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desco Online content
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Get a proper Triumph Parts book and a Triumph Shop manual for that bike. Will save you a ton of grief.
Not Haynes or Clymer.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: Where to start [Re: bmwr90s] #481228
03/14/13 4:19 am
03/14/13 4:19 am
Joined: Nov 2005
Posts: 7,259
Back on the mainland!
JubeePrince Online content

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Back on the mainland!
Art -

http://classicbike.biz/Triumph/Repair/1970s/73-78-Triumph-Bonneville-Tiger-Workshop-Manual.pdf

Drop me a PM and I can help you with the parts manual....


Cheers,

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Where to start [Re: JubeePrince] #481240
03/14/13 8:28 am
03/14/13 8:28 am
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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Thanks Steve, PM sent.


Art


1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: bmwr90s] #481261
03/14/13 3:31 pm
03/14/13 3:31 pm
Joined: Jul 2009
Posts: 3,549
Vic. Australia
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Pete R - R.I.P. Offline
In Remembrance
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It looks like it melted a piston and then cooked the rod.Somebody wasn't listening for the "death-rattle",and might have had too much ignition advance or a bad dose of fuel.

Some of the displaced metal around the edges of the head could be hammered back into shape.It will probably look good enough when it's cleaned up.

The crank's probably OK,but you'll feel better after you crack-test it.Get another pair of rods and put it back together.

Re: Where to start [Re: bmwr90s] #481450
03/15/13 5:07 pm
03/15/13 5:07 pm
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Posts: 571
New York
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bmwr90s Offline OP
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I'm starting to take apart the motor. Is there an alternative way to remove the clutch basket other than using the clutch extractor tool shown in the manual? Also, same thing for the removal of the crankshaft pinion gear. Hate to have to go out and purchase special tools as this is probably the only triumph I get to work on.

Art

Last edited by bmwr90s; 03/15/13 5:08 pm.

1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: bmwr90s] #481463
03/15/13 7:10 pm
03/15/13 7:10 pm
Joined: Jul 2009
Posts: 3,549
Vic. Australia
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Pete R - R.I.P. Offline
In Remembrance
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Joined: Jul 2009
Posts: 3,549
Vic. Australia
I don't think there's any safe substitute for the clutch hub puller.Anything else is likely to break the flange off the clutch hub.

It's easy enough to remove the cush-drive if you replace the springs in the pressure plate with 1/2" washers,then pull the clutch lever to push the cush drive off its splines.You can then remove the clutch basket.You still need the clutch hub puller after that.

You should be able to pull the crankshaft out with the pinion gear still attached.Heat the crankcase in an oven until the timing side main bearing is loose enough to fall out of the crankcase.
At least you'll have the crank out.It will still have the main bearing and pinion attached.

Re: Where to start [Re: bmwr90s] #481473
03/15/13 7:57 pm
03/15/13 7:57 pm
Joined: Nov 2005
Posts: 7,259
Back on the mainland!
JubeePrince Online content

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Posts: 7,259
Back on the mainland!
Art -

When you use the hub puller, couple of things:

1) Use some decent torque to attach the puller to the hub. You want as many threads engaged as possible between the tool and the hub.

2) Be sure to use a rattle gun to drive the bolt onto the tip of the shaft. It's the shock of the bolt hitting the shaft that pops the hub off the taper. If you try to gradually tighten the bolt with a hand-held ratchet there's a good chance you'll strip the threads in the tool and/or bung up the end of the mainshaft....

eBay has pullers for $20. I have one too. If you want me to send it to you to use, PM me your address and you can send it back when you're done.

If you plan to reuse the cam followers in the photo, mark them before you remove them from the guides. If they aren't reinstalled in the same order/direction they (and the cam lobes) could wear quicker..

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Where to start [Re: Pete R - R.I.P.] #481480
03/15/13 8:36 pm
03/15/13 8:36 pm
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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Originally Posted By: Pete R

.....
You should be able to pull the crankshaft out with the pinion gear still attached.Heat the crankcase in an oven until the timing side main bearing is loose enough to fall out of the crankcase.
At least you'll have the crank out.It will still have the main bearing and pinion attached.


Thanks, hadn't thought of that.

Art


1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: JubeePrince] #481481
03/15/13 8:41 pm
03/15/13 8:41 pm
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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New York
Steve, PM sent
Thanks,
Art


1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: bmwr90s] #481631
03/16/13 8:28 pm
03/16/13 8:28 pm
Joined: May 2006
Posts: 571
New York
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bmwr90s Offline OP
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Digging deeper in the motor and found debris scattered in the timming cover. Some made it's way into the oil pump.







Art


1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Where to start [Re: bmwr90s] #720617
12/31/17 5:31 pm
12/31/17 5:31 pm
Joined: Sep 2008
Posts: 593
Skudeneshavn Norway
S
Stein Roger Online content
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Posts: 593
Skudeneshavn Norway
HI Art, enjoying the New Years Eve tranquility to the full, I spend the time searching the BBF for stuff. Came upon this thread you started tears ago. I just wondered how it went from there, as the thread just stopped during the autopsy?
I guess you must have enjoyed the experience as you seem to have bought yourself a Commando since then?

All the best for the New Year,
SR


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