Triumphrat

Mudguard · 02-08-2010, 05:51 AM

Hi all, this is a very basic question but please bear with me. I have just acquired a 1978 T140V, first reg 1980, US spec, (engine T140E). Previous owner had removed engine from frame and stripped primary side and as I know this has been standing for 20 years I want to strip to renew bearings, shells, seals etc. Following the Haynes manual I have removed all the various studs and bolts including the nut behind the gearbox inner cover but am in a bit of a quandry in regard to the crankcase mouth screws as mentioned in the manual ie I cant see them. Are these screws in all engine variants as manual strip down appears to be based on T120? Any advice on seperating crankcases is welcomed. Also there are no bushes in the con rod small ends, knowing previous owner I doubt he would have removed these so the question is were the ends plain as stock with bushing required as ends wore? Sorry if these questions seem a bit inane but we all have to start somewhere. Looking forward to any advice on these queries and any other advice on rebuilding engine would be much appreciated.

DAVE M · 02-08-2010, 06:52 AM

hi good luck with the build.

I'd suggest getting a proper T140 manual - a Triumph one and working to that
The Haynes is cr*p.

I use l.p.williams for most bits, Phil there is a nice guy

http://www.triumph-spares.co.uk/

I also use the T140 shop but he's the slowest bloke postage wise I've ever used

I'm a bit confused about the year of the bike but I'd guess that the engine number is the best guide as to the maunal that you need. Most other stuff will be similar.

mine is a 79E with underslung caliper

jimmy bush · 02-08-2010, 09:58 AM

The con rods on the 750's didn't use bushes, they were just plain. Protect the rods from nicks and scratches with a cardboard tube or foam or something while you're working on the engine. They are prone to failure if they get nicked. I'm not sure what crankcase mouth screews are. I suspect that you might be referring to the two screws that hold the crankcases together at the openings for the tappet guide blocks. If that is what you are looking for, they were omitted on the 750's, only the 650's had them.

GrandPaulZ · 02-08-2010, 10:57 AM

Welcome, Mudguard.

"Just like that", you already have your first answers!

I'm sure you'll enjoy being part of this forum, and getting your first project under your belt.

Webby · 02-08-2010, 04:45 PM

Quote:

Originally Posted by Mudguard

Following the Haynes manual I have removed all the various studs and bolts including the nut behind the gearbox inner cover but am in a bit of a quandry in regard to the crankcase mouth screws as mentioned in the manual ie I cant see them. Are these screws in all engine variants as manual strip down appears to be based on T120? Any advice on seperating crankcases is welcomed. Also there are no bushes in the con rod small ends, knowing previous owner I doubt he would have removed these so the question is were the ends plain as stock with bushing required as ends wore? Sorry if these questions seem a bit inane but we all have to start somewhere. Looking forward to any advice on these queries and any other advice on rebuilding engine would be much appreciated.

Hi Mudguard,

There are no crankcase mouth screws on a T140, I think they where deleted when Triumph changed to the OIF models. (My 71 T120 hasn't got any)
As everyone has said get yourself a real shop manual and parts book, the Haynes manual is Boll*cks! (and yes, it's based on a T120

)
For parts there are loads of places, Norman Hyde is good but expensive, I use TMS and Supreme.

Good Luck with your rebuild

Webby

As Plewsy's just told me he's crankcase mouth screws in his bike (the same year as mine) you'd better double check, look into the cut out for the bottom of the barrels and at the join of the crankcase you might see two screws holding the both sides of the crankcase together. Of course you could be lucky and not have any, who knows!

Plewsy · 02-08-2010, 04:58 PM

Quote:

Originally Posted by Webby

Hi Mudguard,

There are no crankcase mouth screws on a T140, I think they where deleted when Triumph changed to the OIF models. (My 71 T120 hasn't got any)
As everyone has said get yourself a real shop manual and parts book, the Haynes manual is Boll*cks! (and yes, it's based on a T120

)
For parts there are loads of places, Norman Hyde is good but expensive, I use TMS and Supreme.
Good Luck with your rebuild
Webby

That's strange Webby mines the '72 T120R OIF as you know and it has them!!
The exploded drawings in the Haynes are handy the rest is great for soaking up spilled oil

Webby · 02-08-2010, 06:28 PM

Quote:

Originally Posted by Plewsy

That's strange Webby mines the '72 T120R OIF as you know and it has them!!
The exploded drawings in the Haynes are handy the rest is great for soaking up spilled oil

Strange!
Unless someone cut mine off? I've just checked in the books and sure enough they are there in the parts book, now I'm confused?
I'm sure I read somewhere that they were deleted from the later models, or maybe I was dreaming

I'll have a search though the books when I get time and confirm if they really where removed or confirm that I'm going mad!

Webby

jimmy bush · 02-08-2010, 07:14 PM

Not sure but I think they did away with the mout screws when they went to 750cc. On a 650, the part of the cylinder that fits down in the crank cases were two seperate spigots. On a 750 they were joined together. I don't know if it was for clearance or strength but they had to do away with the part of the case where the screws were. I don't think a 750 cylinder will fit a 650 case unless you machine the holes in the cases bigger.

Mudguard · 02-09-2010, 02:17 PM

Thanks for the answers lads. I think I'll hold off until I get a genuine T140 manual as you all seem to advise. Plenty of other work to do on the bike in the meanwhile.

DAVE M · 02-11-2010, 05:26 AM

get a parts book as well
if you have a Bitsa then you might run to two, but most cycle parts are the same, only significant changes needed different parts

you might find one as a pdf for free.

once you can type in a part number, google is your friend.

I needed a T140D part for my E to change the mudguard and had been trying for ages. Someone told me the number, 10 mins later i found one on ebay and bought NOS form the states to the UK