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Stripping down an old Tr6 engine - had it seized? #622331
10/18/15 9:34 pm
10/18/15 9:34 pm
Joined: Jan 2014
Posts: 393
Geneva, Switzerland
BrettF Offline OP
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BrettF  Offline OP
BritBike Forum member
Joined: Jan 2014
Posts: 393
Geneva, Switzerland
Hi Folks,

Finding some nasty damage while stripping down an old engine I got a year ago.

The primamry chain had snapped which chewed up a number of the primary cover screw areas as well as the tensioner aduster screw area. Tacho mounting threads stripped etc etc.

Most of it seems repairable though. The crank looks good also.

There was some colouting on one of the small ends. Im not too experienced with these engines so would like your advice if you beleive the small end seized/ran way too hot(lean?) or is that normal colouring?

the first pic is form the good piston
[img:left][/img]

these next two are from the suspect piston

[img:left][/img]

[img:left][/img]

I'm guessing new con rods are in order?

Thanks folks

Brett

Last edited by BrettF; 10/18/15 10:46 pm.

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Re: Stripping down an old Tr6 engine - had it seized? [Re: BrettF] #622340
10/19/15 1:17 am
10/19/15 1:17 am
Joined: Jun 2007
Posts: 5,848
Maui Hawaii
HawaiianTiger Offline

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HawaiianTiger  Offline

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Joined: Jun 2007
Posts: 5,848
Maui Hawaii
That looks pretty common. Best have a look at the piston pins. That will tell the story.

Also, give us a look at the piston sides and tops. There's a lot to be learned there.

Cheers,

Bill


Bikes
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Re: Stripping down an old Tr6 engine - had it seized? [Re: BrettF] #622342
10/19/15 2:02 am
10/19/15 2:02 am
Joined: May 2015
Posts: 1,459
Florida PanHandle
Zombie Offline
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Zombie  Offline
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Joined: May 2015
Posts: 1,459
Florida PanHandle
I agree that looks normal if not pretty clean for most any engine.
Once you have the pins out, take a look at the bottom of the piston dome. That will tell more about the running conditions of the engine.

There should be an even color inside the dome area. Black ash or shiny areas surrounded by black ash mean it was run too lean or to far advanced on the timing.

Back to the pins... They should press out pretty easily. Almost by hand pressure. If needed a large "C" clamp, a socket the same size (slightly smaller) than the pin, and I use a plastic piece from a cutting board as a backer on the opposite side with a piece of pipe the pin can pass into.

Re: Stripping down an old Tr6 engine - had it seized? [Re: BrettF] #622349
10/19/15 5:06 am
10/19/15 5:06 am
Joined: Aug 2001
Posts: 7,427
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 7,427
scotland
Were there signs of the big or small ends seizing, then new rods would be in order.

In fact, a rod would probably have broken already.

Looks normal to me.


Amateur Loctite enthusiast.
Re: Stripping down an old Tr6 engine - had it seized? [Re: BrettF] #622361
10/19/15 9:32 am
10/19/15 9:32 am
Joined: Nov 2005
Posts: 7,384
Back on the mainland!
JubeePrince Online content

Life member
JubeePrince  Online Content

Life member
Joined: Nov 2005
Posts: 7,384
Back on the mainland!
If the wrist pin(s) look like this, it's not good....

Steve

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