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Triumph Pre unit T110 oil leaks #609214
07/19/15 9:35 am
07/19/15 9:35 am
Joined: Jul 2015
Posts: 6
Hartlepool
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Maddoman Offline OP
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Hello one and all, this is my first posting so please give an old man a chance! My mate Jonesy has a lovely old Triton and in his quest for perfection he's trying to eliminate it having any oil leaks at all, I'm not sure anyone has ever achieved this yet but here's the problem. The bottom end is a 1958 T110 pre-unit set of crankcases and primary chaincase, pre oil seal behind the crankshaft drive sprocket. As he only goes on runs of 75-100 miles maximum he runs the primary chaincase dry and just gives the chain a good blast of chain lube before he sets out. The problem is the residual lube oil from the sump is being forced through the primary drive side and ending up in the chaincase due to the pressure from the downward stroke of the pistons. The crancase breather is in good working order and the Top end was all replaced with brand new bits a year ago so its not compression blowback past the rings. In a nut shell the main lube oil tank is slowly draining through to the primary chaincase. Has anyone out there come up with a way of sealing this side off effectively? I have thought he could put a single sided rubber or metal shielded bearing (MS11) in this side but I don't know if its been done before with any success. The bike usually comes to bits every winter so fit and forget is not really an issue. Also what is the best chain available for the primary drive? something pre lubricated ideally although we know the split link will always be the weakest part. Hope someone can help the aged. Best wishes, Maddoman

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Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609228
07/19/15 11:07 am
07/19/15 11:07 am
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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How much oil and how long does it take? Very little oil usually gets through- certainly not a tankful!

Oil can seep through the lowest of the three screws which hold the inner case to the crankcase.


The primary case can be sealed pretty effectively with a cork gasket.


Amateur Loctite enthusiast.
Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609384
07/20/15 2:23 pm
07/20/15 2:23 pm
Joined: Jul 2015
Posts: 6
Hartlepool
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Maddoman Offline OP
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Thanks for the reply Thrash, Actually not a lot of oil does pass into the chaincase, only a very small amount but its definitely coming from the main lube oil supply as it contains STP additive, my mate always uses this. We think its coming through the chaincase orifice covering the crankshaft main bearing in the drive side as no physical oil seal is in this side. Any thoughts on this and do you think its a possibility. Maddoman

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609387
07/20/15 3:02 pm
07/20/15 3:02 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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When my T110 was more standard, a small amount of oil leaked out of the primary chaincase, behind the clutch.

Just about enough engine oil leaked into the chaincase to replace it.

A bit old fashioned, but better for the chain than depending on sprays, I'd say.

Now I have a belt drive and a big crankcase breather with a reed valve and no oil comes through from the crankcase at all. That's without an oil seal.


Amateur Loctite enthusiast.
Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609439
07/20/15 9:58 pm
07/20/15 9:58 pm
Joined: Aug 2001
Posts: 6,738
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Jon W. Whitley Online content

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Over on The Jockey Journal, a guy by the name of supercrouton of Angry Monkey Motorcycles made an oil seal holder for one of his Pre-Unit Triumphs. You might want to contact him as well as look at his work.

http://www.jockeyjournal.com/forum/showthread.php?p=1492106&highlight=seal#post1492106


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Triumph Pre unit T110 oil leaks [Re: Jon W. Whitley] #609454
07/21/15 1:42 am
07/21/15 1:42 am
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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Originally Posted By Jon W. Whitley
Over on The Jockey Journal, a guy by the name of supercrouton of Angry Monkey Motorcycles made an oil seal holder for one of his Pre-Unit Triumphs.
http://www.jockeyjournal.com/forum/showthread.php?p=1492106&highlight=seal#post1492106


Says he fitted brass valve guides, too.

(??)


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Re: Triumph Pre unit T110 oil leaks [Re: triton thrasher] #609472
07/21/15 6:58 am
07/21/15 6:58 am
Joined: Aug 2001
Posts: 6,738
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I would imagine it is a typo of sorts. He has built many bikes and his reputation is very good...I have no doubt he knows his guides aren't made of brass !




Originally Posted By triton thrasher


Says he fitted brass valve guides, too.

(??)


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609494
07/21/15 11:29 am
07/21/15 11:29 am
Joined: Jan 2014
Posts: 1,638
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reverb Offline
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...all pre units leak from the primary but the oil is only for the chain so as you know you do not need too much.
From the external oil lines screws is where most leak (if you really ride the bikes)and that s worst.
No matter new washers; annealed washers, glue, etc.

-the quality is good but regarding reputation: If you rebuild an engine the best way possible to run at less than 100kms/h only to go to a bar or do 3 -4 short rides per year the engine should handle all that for years and years.
How many times do you heard: Yeah, I have this bike and ride since ---years ago ?
They are afraid to say that only rides few kms per year at low rpm s or trailing the bike on the truck to the next show...
Proven machines are other.

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609504
07/21/15 12:45 pm
07/21/15 12:45 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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The cylinder head drain pipes don't have to leak. There was one banjo joint I couldn't seal for a while, because the surface in the head was not perpendicular to the threaded hole. I drilled the bolt through and fitted a pipe down the middle of it. That pipe is joined to the rest of the external drain pipe with a length of PVC tube.

You're right in that I also found that hard riding made the engine leak from all sorts of places. The big breather cured that trait.


Amateur Loctite enthusiast.
Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609601
07/22/15 2:10 am
07/22/15 2:10 am
Joined: Jan 2014
Posts: 1,638
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reverb Offline
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...hello Triton thrasher; yeah, more in the 40s ones so Im very interested in one of those breathers that you are talking and if I can fit one in a older 500cc.
Also do you have a photo of that other adaptation?

Thanks

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609637
07/22/15 1:19 pm
07/22/15 1:19 pm
Joined: Jul 2015
Posts: 6
Hartlepool
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Maddoman Offline OP
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Thanks for all the interest fellas, i'll have a good read of all that's posted best wishes, Maddoman

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609640
07/22/15 2:05 pm
07/22/15 2:05 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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There isn't much to show.



Closer up. Excuse missing gearbox.


Last edited by triton thrasher; 07/22/15 2:07 pm.

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Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609702
07/23/15 12:34 am
07/23/15 12:34 am
Joined: Jan 2014
Posts: 1,638
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reverb Offline
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...man, that s a big MF breather tube.
In my motorcycle it would looks so big; may be having another breather could fix the problem?
Or may be those possible 2 plus 2 little ones on the rocker caps?

Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609703
07/23/15 1:38 am
07/23/15 1:38 am
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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It can be done nore neatly than mine.

The wide part is where the BMW reed valve is.

Vents in the rocker caps are easy to make, because you can take them to the workbench, but I'm not sure they have much effect.


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Re: Triumph Pre unit T110 oil leaks [Re: Maddoman] #609752
07/23/15 12:34 pm
07/23/15 12:34 pm
Joined: Aug 2001
Posts: 7,026
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triton thrasher Online content
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Sorry- it gets a bit messy!


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Moderated by  Alan_nc 


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