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 Alternator belt replacement

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Kiwi_Roy
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Dave R
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PostSubject: Alternator belt replacement   Alternator belt replacement Icon_minitime1Sun May 24, 2020 5:45 am

My bikes in for its annual service and MOT next week.  It's a 2015 with (approx) 12000 miles (20000 km).  I don't get in as many miles as I'd like due to work and family commitments, but I do like to make sure that it's serviced annually.  The schedule says the alternator belt should be adjusted at 20000 km and replaced at 50000, but I've also read on another thread to change it every 3 -4 years.  

So do I work on the basis that it's only done 20000 km and needs adjusting, or do I work on the basis of it's five years old and should be replaced?  

Cheers
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Pete Roper
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Sun May 24, 2020 6:00 am

Have a look at it. If it looks fine and isn't cracked or loose? Leave it alone.

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Dave R
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Sun May 24, 2020 11:36 am

Cheers Pete - I'd thought of doing that, but wanted reassurance it wasn't a cop-out
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BrianD
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Tue May 26, 2020 4:13 am

I am thinking about replacing mine, believe to be orignal from 2011 which now has 46,000 + miles, I gather there are quite a few alter native belts which are pretty much same lenght + or - a little. Is there sufficient adjustment to accomodate these?

thanks
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Pete Roper
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Tue May 26, 2020 4:21 am

Yup. Gimme a prod if I forget but I can give you the Gates # if you wish. The factory belts aren't particularly spendy but few shops will have them on the shelf. The Gates option is available pretty much anywhere.
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BrianD
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Tue May 26, 2020 4:38 am

OK thanks, I do have some cross references
Gates 4PK738 = 738mm
Gates 4PK740 = 740mm
Cadna 290K4 = 29" whic hI think is 736mm
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paulbrice
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Tue May 26, 2020 4:43 am

Gutsi Bits have 1 in stock at £19.90 + £3.50 postage..... I bought one ages ago and keeping it until the old one starts looking rough.... Main related problem I've already had was one of the plastic cover bolt was completely rusted in and had to be drilled/tapped out after it sheared (even 'special extractors' wouldn't touch it......funny enough (not) had identical problem at same position on guzzi V50 front cover - guess it's where the water spends most time.
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BrianD
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Tue May 26, 2020 5:37 am

Cheers, I was thinking about being a cheapskate Smile

I replaced the front cover bolts with stainless - so hopefully will come apart OK.

I haev wondered about the belt as a couple months ago I spent a log of time riding through floodwater about foot, foot and half deep.
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eeyore
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed May 27, 2020 12:39 pm

BrianD wrote:
Cheers, I was thinking about being a cheapskate Smile

I replaced the front cover bolts with stainless - so hopefully will come apart OK.

I haev wondered about the belt as a couple months ago I spent a log of time riding through floodwater about foot, foot and half deep.

If not already done it could be beneficial to grease the suspension bearings.

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JohnA
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed May 27, 2020 1:24 pm

Can someone tell me how much has to be removed to get at the top two bolts and get the cover off? Or the best way to go about this.
Thank you.

John
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Pete Roper
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed May 27, 2020 2:52 pm

I've been a bit busy over the last few days but I'll try and answer this and a few other questions by the weekend if I can.
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Kiwi_Roy
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed May 27, 2020 3:57 pm

Here is a post I did earlier 2007 2V/cylinder
[You must be registered and logged in to see this link.]
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JohnA
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Thu May 28, 2020 5:31 am

Thanks Roy. Very helpful. That’s swimming in the deep end for me......
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BrianD
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Sun Jun 07, 2020 2:28 am

Fitted new alternator belt yesterday, believe it's original so about 10 years old and 50K plus miles. slight cracking on ribs.

Belt fitted - 4PK730
Original belt length - 740 (outside measurement)

May be useful to someone
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gerrit
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed Mar 10, 2021 1:29 am

I bought a GRiSO 850 2007 with approx. 30,000 km. Suddenly my battery was empty. Cause: Alternator belt was completely gone. I only found some tiny pieces when replacing it. So it was obviously that the old timing belt was the original one. Not only km's count also the age of the belt is a reason to replace the belt.
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lcjohnny
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Wed Mar 10, 2021 8:18 am

Just replacing my alternator belt this afternoon.
There is corrosion and semi-seizure on: one screw holding the ecu, some screws holding the outer cover, the breather stand-off boss, the alternator lock screw and the adjuster screw.
I have removed both exhaust down pipes and both 'wings'. Doesn't make it 'easy' - but it is letting me get all of these screws out with the minimum of collateral damage.

Any metallurgists out there? If i use coppaslip on stainless bolts in aluminium will that lead to more or less electrochemical corrosion?
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Gouldy1411
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Thu Sep 08, 2022 5:08 am

Has anyone checked their alternator bearings when changing the belt? My G11 is coming up to 40K and I have this strange noise from the front of the bike. Sounds like dry bearing noise. I have removed the cover and checked the belt - looks like new- but have not removed it yet, so have not spun the alternator to check for any roughness
Cheers
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Buellbloke
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Mon Sep 19, 2022 3:13 pm

Dave R wrote:
My bikes in for its annual service and MOT next week.  It's a 2015 with (approx) 12000 miles (20000 km).  I don't get in as many miles as I'd like due to work and family commitments, but I do like to make sure that it's serviced annually.  The schedule says the alternator belt should be adjusted at 20000 km and replaced at 50000, but I've also read on another thread to change it every 3 -4 years.  

So do I work on the basis that it's only done 20000 km and needs adjusting, or do I work on the basis of it's five years old and should be replaced?  

Cheers

If it aint broke dont fix it. Cost a pretty penny for removal and replacement from a shop.
Total ballache for the home mechanic
Have never seen mine, bike has 15k and is 12 years old.
You'll know if it snaps the battery will stop charging.
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Pete Roper
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PostSubject: Re: Alternator belt replacement   Alternator belt replacement Icon_minitime1Mon Sep 19, 2022 4:27 pm

4PK-730, 735 or 740 will do a 725 is just a smidge too short.

Changing the belt is hardly a difficult job. Yes you need to drop the ECU off, (On a GRiSO.) to get to the top bolts on the belt cover but that and the left 'Wing' are about it. There is a special tool for setting the belt tension but it's completely unnecessary as long as you have some grasp of how to set a belt.

Thing with belts is that they will either tend to fail early, (Due to being too tight or too loose, usually the latter.) or last a very long time. We've had 150,000 km bikes in that have never had the belt changed. I changed mine recently on the yellow bike at about 80,000km and it basically looked brand new. No cracking or discernible wear. I thought it was time though.

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