Cam chain Tensioner

[Boxersimp]

The next day after my 600 miles first service on my Adventure i started to hear the cam chain rattling esp, when the oil was cold it was noticable below 3000 rpm,so i took it back to the dealer and after them telling me it was ok i made them strip the tensoiner and there was two scores down along the body of the tensioner.
Now i take it the only way it can get scored would be that it has picked up a ittle swarf from a brand new engine after the first oil change.

Has anyone else had this same problem or is there any other reasons or possiblitys why this happened.

Also i take it they should drain the oil and replace the oil filter as well or take sump off to see if any swarf in oil .

Anyway dealer has ordered a new tensioner, and i wondered if there is anything else they would need to check when its being fitted , a simple job but what else should i be asking guys.


Thanks in Advance

Angry steve

 

[littleredrooster]

The tensioner will have scores at each side of the rubber blade where the side-plates of the chain wear it away initially. It then runs on the rollers of the chain and very little more wear occurs......Doesn't sound faulty to me, but I didn't see it.

 

[Kenny Rodkiss]

I think he means this bit and not the tensioner blades.
These work by using the spring for initial tension and then engine oil pressure to keep it there.
If the body is scored then it will not hold oil pressure and the plunger will be free to move up and down like an undamped shocker and not maintain cam chain tension.

 

[Grizzly]

Butterfly Chatter???

Hi Boxerimp,
Like littleredrooster, I haven't seen or heard your bike but I agree that tensioner "wear" you describe is normal and you seem to be getting unduly worried??.
I think a more likely cause of the noise is that the mechanic has set up the inlet butterflies as per the book with zero-zero play in the throttle cables?. If you do this you tend to get a loud chatter as the b/flies rattle on their stops due to the pulsations in the inlet tract. I always set mine up with a little play to eradicate this problem.
This would explain why your bike was fine before the service, but had a rattle afterwards? - worth a check anyway????.

Cheers...........................Grizzly

 

[(RIP) Kaister]

Cause and effect problem here.

How can something not making a noise before the service make a noise after when it isn' touched or affected by the service items ?

Grizzly is exactly right here - its the butterfly's flapping.

( some poor sod in china 's just been killed by a hurricane because of you - but that's another theory )

 

[BiG DoM]

I cannot imagine the mech would have touched the factory set and sealed stops??? Are you not hearing your newly reset valves that were too tight prviously? or normal chatter?

 

[Grizzly]

Cable Adjustments

Your right BigDom, the mechanic wouldn't touch the factory-set and sealed stops - but he would set up the throttle cable free-play as part of the service and the BMW theo. for this is zero, which, as I said above, often result in chatter as cable is almost lifting butterfly off it's stop, making it more likely for induction pulses to cause the butterfly to chatter on and off the stop??
Does that make any more sense???

Cheers...........................Grizzly

 

[Boxersimp]

Cam Chain tensioner

Thanks guys i can see much more clearly now how the tensioner works, and i will ask the mech, is he ajusted the cables, it sort of makes sense that act , when engine oil is cold and putting power on in third gear it seems to give off a heavy clicking chattering noise scared me to the point i nearly filled my nappy i tell you.

Two deep scores on tensioner body so that would make said body float and not then giving corect pressure to the chain slides, yes i makes sense now.

But what has scored the slide in the first place im wondering.

Many thanks guys it dont worry me so much anymore now,will get the dealer to replace the tensioner and then i will try and see how it fairs.

RGDS Steve

 

[BiG DoM]

Re: Cable Adjustments

Your right BigDom, the mechanic wouldn't touch the factory-set and sealed stops - but he would set up the throttle cable free-play as part of the service and the BMW theo. for this is zero, which, as I said above, often result in chatter as cable is almost lifting butterfly off it's stop, making it more likely for induction pulses to cause the butterfly to chatter on and off the stop??
Does that make any more sense???

Cheers...........................Grizzly

Ok, with you, but is the BMW adjustment stated as 2-3 mm or thereabouts (not at home where I can check the manual)?
Will be interesting what the prognosis is.
Cheers

 

[Boxersimp]

Cam chain

Ok dealer changed the cam chain tensioner and oil , filter but noise still there.

Going back in to dealer they now think its rocker float,cant seem to buy that one getting peeved, head tech back from holidays on monday so heres hoping he can sort it.

Bugged Steve

 

[Mick_rw]

Re: Cam chain

Ok dealer changed the cam chain tensioner and oil , filter but noise still there.

Going back in to dealer they now think its rocker float,cant seem to buy that one getting peeved, head tech back from holidays on monday so heres hoping he can sort it.

Bugged Steve

I have this problem with my 1150GS, mechanic took it for a ride and stated it was the tensioners that were faulty, so they replaced them, noise still there. After a big argument with dealer it seems they only changed the right hand tensioner and all the noise is from the left side. Now planned to have left hand tensioner replaced as well. I would get the noise below 3000RPM but only after the engine was nice and warm.

 

[Boxersimp]

Cm chain

Ok got ADV, back from dealer the chief mech, took most of day at it.

He has told me that boxers do a thing called pinging, not pinking but pining,caused by to much fuel being dumped into the cyc, and it gets squashed his words not mine.

funny it didnt PING before the first service and only did so after the service.

Anyway all seems to be fine now he stripped the heads off checked all clearances rockers checked and all ajusted to proper tolerances.

The bike pulls well now with no sign of a noise but i will probably listen for a while to recover my faith in it.

Anyone smell a rat possibly at the first service ???

Cheers Steve

 

[littleredrooster]

34 years of working on all sorts of motors and I suddenly come across pinging, caused by too much fuel being dumped into the cyc.

It's right wot they say - you learn summat new every day!

 

[Boxersimp]

Found out what happened truthfully , twat mechanic had loaded in wrong CD for motronic system and it was giving wrong settings to motronic system all is perfect again.

 

[(RIP) Kaister]

Isn't it amazing how everone suddenly finds a million causes for noises that weren't there before a service and 'suddenly' appeared afterwards.

Instead of knee jerk reactions, talking pure bollocks and using the excuse book - how about a little careful thought.

So 'Chief mech ' strips heads off !! ??

bollocks did he - he might have told you he did but only to placate you - make you think he's 'looking after you, mate'

if he was any good he'd find out straight away using process assessment or plain old thinking and asking questions.

Problems never appear for no reason.