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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 02-28-2012, 03:17 AM   #1 (permalink)
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Smoking T140E After Rebore

I have just had a rebore carried out to my T140E- the bike initially was burning blue smoke on the left-hand pot - when I stripped the engine it showed some scoring in the left-hand pot hence the need for a rebore .
I contacted a supplier and he informed me that he could supply the pistons +.020 & he recommended a firm close to him who could carryout the rebore .

I got the Pistons and the Barrels back, and rebuilt the engine from crankcases up I smeared the Piston Rings & bores with oil to ease insertion of the pistons into the bores I also used piston ring clamps . I turned the engine over ( by hand ) & the engine locked I released the tension on the rocker boxes and the engine turned over with a clicking noise after some thought I deduced that the Valves were hitting the pistons and locking the engine.

I checked the pistons supplied and they are Hepolite Part Number 19255 +.020 Compression ratio for these is 8.5.1 - the original Triumph standard Pistons in the bike Part Number 71-7085 have a compression ratio of 7.4.1 .
I made a few phone calls to other suppliers and was informed that in order to clear this obstruction I should install a +.080 Head Gasket . I did this and the engine turned over freely .


I started the bike on the second kick and lots of blue smoke came from the exhausts I expected some blue smoke as per above as I smeared the Piston Rings & Bores with oil during the rebuild however the amounts of smoke is excessive I stopped the engine and got my Video camera and restarted the engine see attached Links . I am sure that there is something not compatible between the supplied pistons and the rebore

Interested in any thoughts anyone may have or have had a similar experience.





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Old 02-28-2012, 03:36 AM   #2 (permalink)
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Hi Arty,

This request is a can of worms in many respects.

We do not know what Triumph engine rebuilding experience you have, I assume from the videos, not much.

Firstly we do not free rev a rebuilt engine until we have bedded the rings and even then, avoid no load revving of the engine.

Whilst you have covered rings and pistons in oil at assembly (and this is not what I would do) you can well expect some smoke. A newly reassembled engine blowing some white and black smoke is neither here nor there, and only after bedding the rings and some few running-in miles, would you be the least bit concerned about exhausts fumes.

I strongly recommend you seach this forum for threads on bedding rings and running the engine in. Do not have it stand as you have, free revving the thing to see what comes from the exhaust pipe!! RR
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Last edited by RetroRod; 02-29-2012 at 07:06 PM.
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Old 02-28-2012, 04:58 AM   #3 (permalink)
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I have 8.5:1 pistons in my 79T140E and have done for years. No idea what brand, but probably Hepolite.

I don't recall any issues when fitting them
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Old 02-28-2012, 06:43 AM   #4 (permalink)
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Guys

Thanks for your replies been working around bikes 30+years now don't agree with you RR .
If I am honest this is not the kind of response I was looking for .
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Old 02-28-2012, 07:27 AM   #5 (permalink)
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Arty, Judging from your video’s the engine seems to sound ok. My school of thought has always been to get a new engine out on the road as soon as you fire it up. I rebuilt my 140 last year and it puffed some smoke on the initial startup as well. After a short ride the smoking stopped. Have you taken it for a comfortable ride yet? NO LUGGING!
Steve
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Old 02-28-2012, 07:42 AM   #6 (permalink)
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Firstly you need to vent the exhaust gases outside, you cant expect to work on a running engine in those conditions.

I am not familiar with Mk2 concentrics, but they apparently have a cold start (choke) lever.
The engine needs to be warm enough to turn the choke off, or it will smoke.
A large fan will cool the engine while you are working on it.
Dont let it idle for too long, give it some revs now and again.
Has the ignition timing been checked?
The workshop manual says initially the mixture screws should be set 2 1/2 turns out
Have the pilot jets been cleaned out?
The plugs are probably very sooty now, treat it with a couple of new ones...gap .020"?
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Old 02-28-2012, 08:00 AM   #7 (permalink)
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valves should clear the pistons with no problem,even if head has been skimmed there is still enough room for to clear the 8.6-1 pistons
Pushrods not located correctly perhaps,or is the valve timing not correct ?

For oil burning can be several things,poor quality rings,rings not seated,excess clearance in the rebore,too course a finish on the bore etc.
Or it may be your guides.
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Old 02-28-2012, 09:10 AM   #8 (permalink)
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...how about a compression test with the engine warmed up?I fitted new pistons/barrels but they didn't bed in after qute a few miles,even tho I ran them in...Kept blowing oil out of everywhere(mag/dyno/rocker boxes)... I just hope your problems not as serious..Goo luck!
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Old 02-28-2012, 09:12 AM   #9 (permalink)
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...yes Tom,maybe guides?
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Old 02-28-2012, 09:43 AM   #10 (permalink)
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Hope you have not used synthetic oil. Numerous reports of poor ring bedding with syn oil used during break in.

Go bed the rings and then worry about smoking.

Folks are mentioning guides. I would have expected you to have done all the necessary head/valve/guide inspections as part of your top end rebuild. If all was well, you did not replace guides or valves and it did not smoke out of the right jug before, then I would not expect it to smoke out of the right jug now due to guides.

Bed the rings with fossil based oil and then lets see if she still smokes.

regards,
Rob
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