Poly-V belt

[MikeO]

4 pk 611

I'm guessing - but it could be 4 ribs/grooves and 611mm diameter ??.

Certainly 4 ribs - haven't got a ruler/tape to hand - but it fits round my forehead and I wear a 7 3/8 hat - does that help?

Mike

 

[Greg Masters]

.... and I wear a 7 3/8 hat - does that help?

Mike

It's actually quite close!

7 3/8" diameter = 187.325mm diameter

187.325 x 3.14159 = 588.5mm circumference

Mike, is your 611 belt a loose fit around your bonce? Could 611 be the length in mm?



Greg

 

[kal151]

When I replaced mine the other day, I bought a spare. Here's all the text & figures on it:

BMW 11.28 - 1341 779 - 692637 4 PK 611 SR Made in Germany CONTITECH 5 >CR< 9 F 28 01 04

Any help?

Mike

I'm not sure about the 11.28 part. The 1341 779 - 692637 part has to do with what compound the belt is made of and what production drum it was built on. The 4PK 611 SR means four ribs and a 611mm circumference, measured at the base of the ribs. If you take the wifes measuring tape (that flexable vinyl bit from the sewing kit) and wrap it around the belt it will come close to 600mm. I hope this is a better belt for you. Everybody remember to inspect your belt from time to time. If you see the cord sticking out the side, clip it off. I have seen several belts that wind themselves up on the pullies when the cord pops out (not pretty) and they can do some damage. Even if you clip it off, it can continue to come out so go ahead and replace the belt (better safe than sorry :cockeye ).

 

[guitarman]

I'm fascinated by the idea of carrying a spare belt. Is this the sort of job you can do at the side of the road then?

If it isn't then surely it's just a matter of calling the AA or whoever.

Cheers

Dick

 

[Iain Hogg]

Yes it is, certainly as far as "get you home" mode, there should be enough tools under the seat to do it.


Pretty simple job to replace a broken belt to get you going again but it is worth checking the tension once you get there

Iain

 

[(RIP) Jamie]

There is one small problem

I'm fascinated by the idea of carrying a spare belt. Is this the sort of job you can do at the side of the road then?

If it isn't then surely it's just a matter of calling the AA or whoever.

Cheers

Dick

I keep mine under me seat. And it looks like a doddle to change, so 20 minutes max is the difference between riding home or getting a lift in a big yella van.

BUT

I've got H&B bars on - whole nuther thing. But essentially would only add TIME and lots of swearing to the replacement. You'd have to loosen the bars, not take them off.

But if your belt goes and you drop it, I'd be happy with the inconvenience.

 

[guitarman]

Well I hope I'm riding with you guys if my belt goes

Cheers

Dick

 

[littleredrooster]

Wow!! Just replaced mine as part of a service. Only three ribs left (where t'other one went is a mystery) and half of the belt had no ribs at all! This may explain the soft 'twittering' noise the bike used to make occasionally on start-up. It was obviously the belt slipping on the pulleys. 28,000 miles, before you ask, and I'm sure it wouldn't have done another thousand.

 

[Greg Masters]

After reading this thread, I decided to look at the belt on my bike - even though it's only done 25k miles and I've never touched the alternator or removed the belt cover.

I'm glad I did as the belt was missing several inches of one of its V sections.



Greg