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Pump 19
Chessington,
United Kingdom
Posts: 4,516
Speed Triple 955i (02-04)
13 May 2008 10:37 |
Hi all.
I have done a fair bit of searching and reading up, but I still have a few questions.
Okwhen I start my bike, an 03 speed triple 955i, sometimes it makes a loud clunk which stops the starter turning.
It doesnt do it every time, maybe 1 in 8 starts? But it does seem to happen much easier if the engine is hot.
There are no unusual sounds or effects when the engine is running.
There are no other issues with it running but it did stop with a clunk when I shut the engine off last night.
The sound seems to come from t he right hand side of the engine.
I did the 12k service just a few months ago and I know that the valves are all well within the tolerence levels, so unless something catastrophic has happened to the valves its not that.
Which brings my diagnosis to the sprag clutch. Would you concur with that?
I havent heard of this in 03 955i engines much so maybe Im just unlucky.
So the questions then  .
Obviously Im not going to pay some thief of a dealer to do something I can do myself. Ive been reading through the threads and some people say its an engine out and split cases job, others say it can be done with the engine in.
Just how an involved job is it? I know I need one special tool and thats not a problem, Ill just get it.
What do I need to know before I put it up on a bench and get spannering
As usual, cheers in advance for any replies
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Kerry
foot of Mt Taranaki,
New Zealand
Posts: 81
Premier Member
Daytona 900 (93-96)
13 May 2008 14:38 |
The '03 model has the starter on the RH side of the engine. No need for engine split. Take out the bung located there. You will find an M8 allen head bolt that secures the starter assembly, check that its tight, 54Nm. This has been known to come loose and break the crankshaft end off, not good!
I'd check this first, let us know how you get on Pump.
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Kerry
foot of Mt Taranaki,
New Zealand
Posts: 81
Premier Member
Daytona 900 (93-96)
13 May 2008 14:43 |
Have posted a pic for you in Albums under WORKSHOP title, has your name on it.
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Pump 19
Chessington,
United Kingdom
Posts: 4,516
Speed Triple 955i (02-04)
13 May 2008 16:11 |
AHA !!!
Many many thanks for those pics.
I was using that allen bolt to turn the crank when I did my valve shims. Its possible that I lossened it, although Im certain I only turned it clockwise which should if anything tighten it.
Im not going to get a chance to check it this side of the weekend now, but many thanks for the reply.
Ill let you know what I find
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geoff
north devon,
United Kingdom
Posts: 2
Sprint RS (02-05)
01 Jun 2008 15:43 |
hi pump 19, i am also having starter probs and cocluded it is the sprag clutch, oh dear it sounds a nightmare to do please keep us posted , ps i have just ordered a haynes manual.
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Druid
Black Country,
United Kingdom
Posts: 33
Speed Triple 955i (02-04)
02 Jun 2008 11:44 |
The sprag clutch failed on my 04 Speed Triple at <10k miles. Replacement was quite straightforward as per Kerry's pics. I bought mine from Triumph-ant for considerably less than my local Triumph dealer wanted, it arrived the next day. They did say that they'd seen a few 02-04 models with this problem
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Terry Colley
Sydney,
Australia
Posts: 121
Speed Triple 955i (02-04)
02 Jun 2008 13:17 |
It's disappointing to hear this. There has been a few threads about sprag clutch failures on post '02 triples. Everybody thought now the sprag is easy to get to it was ironic that Triumph had finally nailed the problem. These threads suggest that's not the case so we should be thankful it is easy to access.
I haven't examined the Triumph sprag design in any depth but when the battery is less than 100% it seems unable to cope with the reverse loads when it snatches and kicks backwards. And of course post '02 models will all be in need of fresh batteries by now hence the failures starting to appear.
This has been an issue from the first Hinckley T300's in the early '90's. It has to be a fundamental design fault that Triumph keep repeating. Yet, if you held a sprag from the mid '90's in your hand you'd wonder how it could fail as it seems way over engineered - it's a big heavy sucker (compared to many Japanese units).
Anybody any thoughts on how it differs from similar assemblies by the Japanese manufacturers?
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 X-Man
Chesterfield/Derbys,
United Kingdom
Posts: 8,929
Premier Member
Enthusiast
02 Jun 2008 15:56 |
many manufacturers sprag clutches (if not all) are suseptible to failure because of battery weakness. I think it is inherent in the design rather than the build quality (although that will affect just how suseptable they are). I think the Triumph one is one of the better ones but constant abuse will cause them to fail and just for once its user fault.
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Pump 19
Chessington,
United Kingdom
Posts: 4,516
Speed Triple 955i (02-04)
03 Jun 2008 21:26 |
Ok, due to decorating and other stuf going on at home at the moment I havent had a chance to look at this in any detail yet.
Luckily I have another bike that I commute on so fixing this has been a low priority for the last few weeks.
Yesterday after work I popped it onto a stand and drained the oil out and took off the cover over the end of the crankshaft.
putting the bike in gear, standing on the back brake and trying to turn the bolt simply turns the wheel because the brake doesnt have enough bite against a breaker bar on a socket turning the bolt.
So it seems tight on first inspection but I need to have another look tomorow and make sure.
54nm is a lot of torque and so its possible that a combination of the high torque rating and the inertia or turning force of the crankshaft means that although its too loose its still too tight to turn by hand.
Which would account for the fact that it doesnt make the noise on starting all the time
Does that make sense? It seems logical to me.
I was going to have a look this evening but its pissing down and its cold and damp in my garage. Hopefully Ill get a look tomorrow and Ill update this thread.
Many thanks to Kerry for the pictures which made the explaination much clearer.
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Terry Colley
Sydney,
Australia
Posts: 121
Speed Triple 955i (02-04)
04 Jun 2008 06:41 |
Hey Kerry,
Just had a look at the pics you posted for Pump19 - excellent!
One question, why the Ansell gloves? you making sandwiches at the same time? 
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geoff
north devon,
United Kingdom
Posts: 2
Sprint RS (02-05)
04 Jun 2008 21:56 |
hi all again, thought i would take the covers off, and hey there is the sprag clutch right on the end of the crank, mine is a 955 2003 model, so easy, just goes to show you should not listen to all the stories of full engine strip.
good news and bad news, ordered new sprag and app 135gbp plus vat but i'm afraid (for owners of later engine models)a slightly later engine than mine was a whopping 248 gbp plus vat, blimey, looking forward to fitting and riding again..
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Pump 19
Chessington,
United Kingdom
Posts: 4,516
Speed Triple 955i (02-04)
06 Jun 2008 02:03 |
You have to split the crank cases for the pre 2001 engines, they moved it to make it accessable without splitting the engine in 2001 and on engines.
Quick update.
I took of the starter cover and the idler gear all looks ok.
Took off the right engine cover off and had a good look. The intermediate gear appears fine as does the clutch assembly gear.
Nothing appeared to be loose and the bearings and shafts are all in good condition.
I ran out of time but tomorrow evening Il take out the sprag clutch assembly and make sure thats all ok. The bolt holding it on appeas fully torqued up, so IM assuming Ill find something loose, worn or damaged in the clutch assembly.
If I dont find anything Ill have to just put it all back again with new wave washers and see if the noise comes back.
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