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Connecting Rod Wobble #432730
05/01/12 5:40 pm
05/01/12 5:40 pm
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
'70 TR6R
Morgo 750 kit

While I was riding the bike the last couple of weeks, I noticed (heard) a mild "clunking" noise coming from the old engine. The faster the RPM's, the faster the "clunking". So I took the rocker boxes, head and barrels off and started to check the innards out.

I did notice that when I grabbed the connecting rods separately, I could wobble them side-to-side approx. .010-.015. The left one a bit more than the right. I noticed that the conn. rods were moving on the crank, not at the wrist-pin area. This also recreated my "clunking" noise a bit. Please tell me I'm allowed a little play in my conn. rod bearings, because if not, I'm afraid I'm in for a complete tear down.

It's riding season and I really don't want to spend half of the Summer rebuilding the engine - again! It's been approx. 6 years since I did it the first time. Shouldn't these bearings last a bit longer? Could the 750 Morgo kit develop too much "oomph" for the stock bearings to handle? I did tighten them up with a torque wrench, but I know I never checked the "stretch" of the bolts.

Any good news for me?


'70 TR6R Chop (always in process)
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Re: Connecting Rod Wobble [Re: Ken Holby] #432754
05/01/12 7:28 pm
05/01/12 7:28 pm
Joined: Mar 2005
Posts: 10,158
Boston, Massachusetts
J
John Healy Offline

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John Healy  Offline

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J
Joined: Mar 2005
Posts: 10,158
Boston, Massachusetts
Ken: There is side-to-side movement, of which you should have movement as you describe, and then there is up-and-down movement, of which you should not have any perceptible movement.

So there is play, and there is play.

Sliding Side-to-side - yes.
Movement Up-and-down - no.


Re: Connecting Rod Wobble [Re: Ken Holby] #432781
05/01/12 8:39 pm
05/01/12 8:39 pm
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
John,

Thanks for the reply.

As far as I can tell there is no up-down movement. The movement is where the lower conn. rods surround the crank. You say it's allowable to have "a little bit" there?


'70 TR6R Chop (always in process)
Re: Connecting Rod Wobble [Re: Ken Holby] #432803
05/01/12 11:06 pm
05/01/12 11:06 pm
Joined: Feb 2007
Posts: 210
Corning N.Y.
C
choppadude Offline
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choppadude  Offline
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C
Joined: Feb 2007
Posts: 210
Corning N.Y.
I would take a good look at the rotor. When the inner sleeve becomes loose on the rotor it will make a tell tale bottom end "knocking" or "clunking side. I have seen more than one Triumph bottom end rebuilt only to find the noise was still there and turned out being a loose rotor center.

Re: Connecting Rod Wobble [Re: choppadude] #432952
05/02/12 5:22 pm
05/02/12 5:22 pm
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Originally Posted By: choppadude
I would take a good look at the rotor. When the inner sleeve becomes loose on the rotor it will make a tell tale bottom end "knocking" or "clunking side. I have seen more than one Triumph bottom end rebuilt only to find the noise was still there and turned out being a loose rotor center.


I'll check it out...thanks. Didn't you used to be a member on the Chopper Underground? It's where I got started.


'70 TR6R Chop (always in process)
Re: Connecting Rod Wobble [Re: Ken Holby] #432959
05/02/12 6:24 pm
05/02/12 6:24 pm
Joined: Sep 2007
Posts: 1,597
Shingle Springs, California
Roadwarrior Offline

BritBike Forum member
Roadwarrior  Offline

BritBike Forum member
Joined: Sep 2007
Posts: 1,597
Shingle Springs, California
Rotor or wrist pins will get you that noise.

Last edited by Roadwarrior; 05/02/12 6:24 pm.

Bob


73 Triumph T140 Main Ride
70 Bonnie
67 BSA West Coast Hornet

56 Chevy

Who are the brain police?



Re: Connecting Rod Wobble [Re: Ken Holby] #435088
05/15/12 3:15 am
05/15/12 3:15 am
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
It seems that both exhaust push-rods had somehow come off and rode halfway between the edge of the "ball" castings and the back edge of the rocker box. I had indents in the rocker castings and gouges in the aluminum box themselves. Funny thing was there wasn't any damage to the push-rods, which was okay with me. Re-installed everything and am getting ready to button it up....again.

BTW - Everything else seemed fine. Thanks for the advice guys. bigt beerchug clap


'70 TR6R Chop (always in process)
Re: Connecting Rod Wobble [Re: Ken Holby] #435112
05/15/12 10:35 am
05/15/12 10:35 am
Joined: Jan 2005
Posts: 1,662
East Bethany New York
Dick Harris Offline
BritBike Forum member
Dick Harris  Offline
BritBike Forum member
Joined: Jan 2005
Posts: 1,662
East Bethany New York
I have installed several Morgo kits and in each case the pistons had too much clearance which caused piston slap.Usually getting less noticable when the engine gets up to tempreture. Dick

Re: Connecting Rod Wobble [Re: Ken Holby] #435148
05/15/12 4:41 pm
05/15/12 4:41 pm
Joined: Jun 2010
Posts: 523
Maine
M
MikeinBiddeford Offline
Private sponsor
MikeinBiddeford  Offline
Private sponsor
M
Joined: Jun 2010
Posts: 523
Maine
And you ruled out the primary chain?


Please do not believe anything I write. I am a hack but I like to guess the right answers.
Re: Connecting Rod Wobble [Re: MikeinBiddeford] #435264
05/16/12 10:39 am
05/16/12 10:39 am
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Mike,

I checked the stator rotor, but never did check the chain. I will do that today.

BTW - I needed a new ignition switch to replace my old generic one, so I called up one of our local Harley, etc. repair shops (I do his home page) and asked if he had one. He said he had an extra one, so I went down and he had a 2012 side-mount style old one some guy had replaced because he wanted a tank style switch. $10 !! It even fits in my custom bracket. Sometimes you just get lucky.


'70 TR6R Chop (always in process)
Re: Connecting Rod Wobble [Re: Ken Holby] #435309
05/16/12 4:52 pm
05/16/12 4:52 pm
Joined: Sep 2007
Posts: 1,597
Shingle Springs, California
Roadwarrior Offline

BritBike Forum member
Roadwarrior  Offline

BritBike Forum member
Joined: Sep 2007
Posts: 1,597
Shingle Springs, California
The primary chain would have to be pretty loose to give you a clunk. How did you test the stator rotor?


Bob


73 Triumph T140 Main Ride
70 Bonnie
67 BSA West Coast Hornet

56 Chevy

Who are the brain police?



Re: Connecting Rod Wobble - UPDATE [Re: Roadwarrior] #435415
05/17/12 5:24 am
05/17/12 5:24 am
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline OP
BritBike Forum member
Ken Holby  Offline OP
BritBike Forum member
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
First I used a wrench to try to move it around, nothing. Then I grabbed it with some clamping-jaw pliers and tried my best to wiggle it...nothing. I know the magnets there are still good because they kept grabbing my wrenches.

Without taking the side case off, I think this is the best I could do.

UPDATE: After replacing gaskets and rings, I got it started tonight. Sad to say the "knocking/clunking" is still there. It's a bit hard to hear, but it's there. I think I will ride it this year like this and hope it doesn't get worse...then I'll probably break it down this Winter. I'm not looking forward to that, but if it must be done it must be done.


'70 TR6R Chop (always in process)

Moderated by  John Healy 


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