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#501895 - 08/15/13 6:10 pm Re: T140 STILL.....Won't run right!!!!! [Re: John Healy]  
Joined: Apr 2011
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Jel Offline
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Jel  Offline
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Rugby,United Kingdom
http://s1274.photobucket.com/user/yelleja/library/

Hi, few more pic's showing thrust (front) faces of pistons, rings, wrist pins, and bores... any thoughts???

thanks Jel

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#501910 - 08/15/13 8:49 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
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az-idea Offline
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palo alto,ca.
....what are the Cr ring Gaps like...?....and....Maybe...these guys dumped 5/30 motor oil in Her...?.....

#502023 - 08/16/13 1:13 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Mar 2005
Posts: 9,962
John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,962
Boston, Massachusetts
Jel: What I can see with these pictures.

Signs of detonation on the tops of both pistons.

This would explain the discoloration of the gudgeon pins as they were exposed to more than the normal amount of heat this engine would develop.

The discolored pins would explain the early signs of seizure just under the oil rings of each piston. If I saw this without the pins being discolored I would look into seeing if the piston had the correct clearance. The piston was getting too big for the bore. This happens when the bore isn't big enough for the piston or the bore is proper, and excessive heat expands the piston more than normal.

The microscopic vertical grooves are more, than likely, from honing swarf that was not washed away after honing. The honing stones leave microscopic bits of stone embedded in the cylinder surface. These alone can cause these scratches and also ruin a set of rings.

The carbonized oil coating between the top and second ring is troublesome. It should look more like the surface between the 2nd ring and the oil control ring.

I dragged the picture showing the two pistons and their rings to my desktop and opened it in photoshop. I did this so that I could correct the color balance and contrast to get a better look at the rings. The picture is slightly out of focus and a pretty small resolution. But what I can see shows rings that are in a distressed condition.

The face of the rings should be smooth and polished. From what little I can see yours look black with striations similar to what you see on the piston.

On another note, the cylinder is glazed and doesn't look to me that it had a coarse enough finish.

If it was mine I would remove the carbon from the top of the piston.

Get another set of rings.

In a perfect World I would get another gudgeon pin, but that might be harder than you think.

Get a set of new circlips.

Have someone break the glaze on the bore with a 150-180 grit honing stone (NOT A BALL STONE!!!!). No metal needs to be removed. You just want to rough up the bore.

If you don't already have it get some Motorcycle oil: We would use 20/50 API SG JASO MA. And because you are in the UK where break-in oil is everywhere, a good 40 weight break-in oil (or 20/50 if available).

WASH THE CYLINDER IN HOT SOAPY WATER UNTIL, when you wipe a white, lint free, paper towel with some oil on it, untill it comes out as clean as it came off the roll.

Put oil on the thrust faces of the piston, assembly lube on the gudgeon pin and assemble top end.

Start engine, but DO NOT let it idle. Have helmet on. Start bike keeping rev's up (blipping 1500-2500), let warm for a minute or two, and take the bike up through the gears putting a moderate load on the engine.

Then ride normally - no LUGGING (increases chances of detonation) and no RACING.


#502090 - 08/16/13 8:05 pm Re: T140 STILL.....Won't run right!!!!! [Re: John Healy]  
Joined: Nov 2008
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desco Online content
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desco  Online Content
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Bishop, Calif.
And that my friend is a proper analysis, assembly procedure and break in routine all on one page.
Thanks John, I have already printed it out.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
#502182 - 08/17/13 7:04 pm Re: T140 STILL.....Won't run right!!!!! [Re: John Healy]  
Joined: Apr 2011
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Jel Offline
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Jel  Offline
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Rugby,United Kingdom
Thanks John, Will follow this advice. Looked at rings, they are polished evenly all the way round, but someone else who looked pointed out(on one ring at least) that the polishing was at the top which he suggested meant the ring/rings were in the wrong way up!! which would cause oil to get past... When I assembled the bike there were no indicaters to what way up they should go (which I expected!!!) and they certainly were not cheapo rings!!!!The gaps by the way az are ok!!
Have ordered a new set of rings and also some valves, bit of scoring on a couple of them and the tops are badly 'dished)
There is a engine re-conditioning shop local who a couple of guys in the Triumph owners club recommended. Lot of experience with car and bike heads... Has a Serdi valve seat cutting machine. Thinking about getting him to 'clean up' the seats..not pitted but they look at little 'grooved' Also thinking it will at least save me spending hours trying to get at good seal!!? But also wondering seeing as I'm at this point whether to just have new guides fitted as well (just for peace of mind if nothing else!!!) Happy with the rings analysis but worried about the carbon build up on the backs of the inlet valves??? surely that is oil coming down the guides??? The fact that the bike had a hard life (poor maintenance,misuse? etc..)makes me think if poor oil wore other components will it have wore/damaged/scored the guides as well???
Any thoughts on any of that???

and thanks again ...invaluble advice.....

Jel

Last edited by Jel; 08/17/13 7:06 pm.
#502611 - 08/20/13 3:05 pm Re: T140 STILL.....Won't run right!!!!! [Re: John Healy]  
Joined: Apr 2011
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Jel Offline
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Jel  Offline
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Rugby,United Kingdom
Hi,
Have decided against having new guides, just going with the valves, rings etc... All things considered after john's advice on Triumph rockers running 'drier' than most bikes the problem must have been the rings....
One more issue I could do with help though. When stripping down, the rocker shafts were turning in the boxes.. Got the exhaust one out, but the inlet shaft is still in the box.... had to undo the oil feed pipe and remove box with shaft, nut and feed pipe still on. Any ideas on how to get it out???

thanks Jel...

#502621 - 08/20/13 4:29 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Oct 2003
Posts: 11,107
RF Whatley Online content
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RF Whatley  Online Content
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North Georgia, USA
An air wrench will turn the nut so fast the shaft doesn't have time to react. This solution will require an air wrench and a Whitworth/BS socket wrench. Not sure you have access to those.

However, this may expose an issue you didn't know you had. The shaft is actually 2 separate pieces that aren't ever supposed to come apart. If the shaft is spinning, then the cap may have come loose from the shaft. Be sure and check for that.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#502630 - 08/20/13 5:45 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Mar 2005
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John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,962
Boston, Massachusetts
Measuring the guide and the valve stem will tell you if you need new guides!


#502742 - 08/21/13 11:46 am Re: T140 STILL.....Won't run right!!!!! [Re: RF Whatley]  
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Jel Offline
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Jel  Offline
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Rugby,United Kingdom
Thanks RF, got an air wrench at work and it has done the trick!! Trouble is those shafts are going to spin when I re-assemble yes?? What can be done???
I have measured the shaft diameter (where the rockers run)In the workshop manual spec's it says they should measure .4990" - .4995". mine are measuring .4985" and a little less in places. Doe's that mean they re-placing anyway??

John, have measured the valves. One is about a thou under but they look marked. Can't measure the guide bore, nothing to do it with. They are my main concern... with the wear everywhere else (mostly down to unchanged oil methinks??)could they be not so much worn as scored?? Guy who is going to re-cut valve seats reckons the guides are ok (he 'wiggled them!) said one was 'a little' loose!!?? and he is highly recommended and no doubt has plenty of experience.
Please forgive my paranoia on this issue, just want to dot the i's and cross the t's before re-assemmbly..
But just out of curiousity... what sort of life/mileage should you get out of the guides???
many thanks for the help...

Jel

#517305 - 12/03/13 7:25 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Sep 2007
Posts: 1,562
Roadwarrior Offline
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El Dorado, California
Did you sort out what were the problems? Is the bike running correctly? What ended up being the cause?


Bob


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

56 Chevy

Who are the brain police?



#517361 - 12/04/13 10:46 am Re: T140 STILL.....Won't run right!!!!! [Re: Roadwarrior]  
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Snakeoil Offline
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Snakeoil  Offline
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Upstate NY
Yeqh!!! I just read this whole stinkin' thread with great interest only to have it leave me hanging.

Please let us know how you made out.

I was also wondering where he found those 3 piece oil rings. I thought you could not find them anymore for our bikes.

regards,
Rob

#517422 - 12/04/13 7:07 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Sep 2007
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Roadwarrior Offline
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El Dorado, California


Bob


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

56 Chevy

Who are the brain police?



#517427 - 12/04/13 8:03 pm Re: T140 STILL.....Won't run right!!!!! [Re: Roadwarrior]  
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Snakeoil Offline
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I think you are right. The saga continues....

Wish he had kept it all in the same thread.

regards,
Rob

#517655 - 12/06/13 12:19 pm Re: T140 STILL.....Won't run right!!!!! [Re: Snakeoil]  
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Posts: 191
Jel Offline
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Jel  Offline
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Rugby,United Kingdom
Ahhhh, sorry guys...this is all a bit new and alien to me.. and I've had a whole lot of non-bike related crap to deal with this year... will try and keep you informed and keep everything together...
glad you are still following the 'saga/nightmare!!!!


sorry again...

Jel

#517656 - 12/06/13 12:25 pm Re: T140 STILL.....Won't run right!!!!! [Re: Snakeoil]  
Joined: Apr 2011
Posts: 191
Jel Offline
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Jel  Offline
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Rugby,United Kingdom
Rob,

the three piece rings were from Norman Hyde, got them about 3 years back, not sure if you can still get them. Spoke to aguy who used to work at Meriden and he too was real surprised to see them!!!!!

#592266 - 03/28/15 8:45 am Re: T140 STILL.....Won't run right!!!!! [Re: Pete Suchawreck]  
Joined: Mar 2015
Posts: 4
kevin18 Offline
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kevin18  Offline
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Joined: Mar 2015
Posts: 4
bristol uk
hi, had my mates t140v firing on 1 cylinder befor and after engine rebuild,checked everything still nothing, came across
your post and took off live to switch and connected it to
live on battery, now running perfect, new switch on order,
thanks for your post saved my mate money and me a lot of time.

kev

#592271 - 03/28/15 9:08 am Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: May 2014
Posts: 148
cacinni Offline
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Pennsylvania, USA
I had a headlamp toggle switch drive me absolutely crazy! System of elimination works well! GOOD LUCK!

#592363 - 03/28/15 8:02 pm Re: T140 STILL.....Won't run right!!!!! [Re: Jel]  
Joined: Jan 2014
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NickL Online content
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NickL  Online Content
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Aus
Sounds like a valve.



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