Bad engine noise!

[jacksdad63]

Belt is off, the alternator is the cause of the bad rumbling noise. One bearing has failed, I can just about turn the pulley by hand, it should spin freely. With the belt still off and the cover removed, there's that high pitched squeak noise, as the vid shows it stops above about 1500 rpm. Maybe they all do that? with the belt back on, applying load, and the cover replaced, it may shut up...

 

[Steptoe]

Belt is off, the alternator is the cause of the bad rumbling noise. One bearing has failed, I can just about turn the pulley by hand, it should spin freely. With the belt still off and the cover removed, there's that high pitched squeak noise, as the vid shows it stops above about 1500 rpm. Maybe they all do that? with the belt back on, applying load, and the cover replaced, it may shut up...

Very very doubtful it’s an alternator bearing problem. It’s most likely the usual problem of a distorted and cracked alternator case that’s stopping the windings/commutator from turning smoothly,

 

[jacksdad63]

Very very doubtful it’s an alternator bearing problem. It’s most likely the usual problem of a distorted and cracked alternator case that’s stopping the windings/commutator from turning smoothly,

That would rule out getting it rebuilt then. Looks like a £200 replacement with 6 month warranty is my best option!

 

[Steptoe]

That would rule out getting it rebuilt then. Looks like a £200 replacement with 6 month warranty is my best option!

At that price I’d buy a few. New alternator is £800+ , used ones from bmw breakers (if available as they’re as rare as hens teeth) cost £500/ £600

 

[jacksdad63]

Used alty with 6 month warranty now paid for, well known UK BMW parts seller so should be all good. I'll get mine removed tomorrow, if its not falling to bits I'll get it rebuilt and sell on, hopefully!
Now there's just the wailing noises as in video #2 to sort out...any more ideas?

 

[Santa-2512]

Chirp aside, thats a sweet sounding engine,

 

[Santa-2512]

Used alty with 6 month warranty now paid for, well known UK BMW parts seller so should be all good. I'll get mine removed tomorrow, if its not falling to bits I'll get it rebuilt and sell on, hopefully!
Now there's just the wailing noises as in video #2 to sort out...any more ideas?

If its what Steptoe thinks, and he's prolly right, its fubarred beyond repair.

 

[iangough]

The oil may have been changed but do you know what grade of oil was used etc etc. It's winter so it won't be running hot which does make them rattle more, as Santa said a 10/40 oil will let the rattles sound worse. I'd change it for a 15/50 or even a 20/50 to see if the thicker oil makes a difference. Though those noises sound wrong.

after 80k I started using 20 50 oil. It stopped the rattles for quite some time. This does not sound like an oil issue. (if the oil level is correct)

Sent from my Pixel 8 Pro using Tapatalk

 

[jacksdad63]

Thanks again peeps, just need to sort out the new noise now!
It does stop above c.1700 rpm so I'm not overly concerned. The bike has been BMW dealer serviced from new, I've got receipts and dealer stamps for all the work and annual inspections, its been looked after.
The trader I bought it from said the last owner was a Buddhist Monk who toured the temples in UK and Europe, often wearing his official robes..I'd love to find out more, find out if he fitted the £5k worth of accessories. There's also a 2 year old receipt for the Ohlin shocks 'full service', and for setting up the front forks and shocks...£633!
The alternator belt was swapped 2000 mies ago, one of the pulley holes has been tapped to M6 so whoever did it knew about the bolt secret...
Much loved bike for sure

 

[jacksdad63]

My new alternator is here, excellent service once again from James Sherlock BMW parts, highly recommended!
Off a GS that did 53,536 miles, comes with 6 months warranty
Just checked the belt, fitted by a BMW dealer 2000 miles ago, its got a hole in it, a 2mm hole punched through in one of the outer grooves (I can't add a picture now!)

 

[Steptoe]

My new alternator is here, excellent service once again from James Sherlock BMW parts, highly recommended!
Off a GS that did 53,536 miles, comes with 6 months warranty
Just checked the belt, fitted by a BMW dealer 2000 miles ago, its got a hole in it, a 2mm hole punched through in one of the outer grooves (I can't add a picture now!)

Denso or Bosch alternator ?

 

[jacksdad63]

Bosch 0124 120 007. Spins like a swiss watch! Appears to be in perfect working order, the one on the bike won't spin at all, it turns about 3/4 turn then stops, and needs a good twist to get over this one area...just hoping its rebuildable but from what I've learnt on here its had it!
I've now found another small hole in the belt, and a little bit of damage. Looks like it was forced on with screwdrivers! New one ordered, ELAST 592 from Motorworks, cost me just under £20 delivered with my bit of trade discount, well worth the peace of mind, otherwise I'd be thinking about it all the time...

 

[jacksdad63]

Well then! Its a Denso alternator fitted, it looks like you just remove the denso wiring loom to reveal the Bosch one. but the replacement Bosch unit I've bought has one wire pin in the connector block, after looking at the wiring diagram it appears to be 1200RT only!
So if indeed it won't do, does anyone have a list of part numbers that will fit? Or have one...I know, rocking horse stuff...

 

[Santa-2512]

Well then! Its a Denso alternator fitted, it looks like you just remove the denso wiring loom to reveal the Bosch one. but the replacement Bosch unit I've bought has one wire pin in the connector block, after looking at the wiring diagram it appears to be 1200RT only!
So if indeed it won't do, does anyone have a list of part numbers that will fit? Or have one...I know, rocking horse stuff...

www.realoem.com

you need to know your month of manufacture as well as year

Parts changes occur twice a year (uplift) hence needing to know month of manufacture

its not set in stone as you also have run out run in of parts , so its not unuasual to find a part in early or past the uplift date

 

[Pukmeister]

The belts can get damaged from tiny bits of flint or road chippings that get flicked up and under the belt cover over time. They can also get nicked by the pulley ribs when fitting, which is why I used some plastic strips cut from an old milk bottle to ease the belts smoothly over the pulley then remove themonce the belt aligns with the grooves after rotating by hand.

 

[jacksdad63]

The belts can get damaged from tiny bits of flint or road chippings that get flicked up and under the belt cover over time. They can also get nicked by the pulley ribs when fitting, which is why I used some plastic strips cut from an old milk bottle to ease the belts smoothly over the pulley then remove themonce the belt aligns with the grooves after rotating by hand.

Thats how I removed the belt, so you used the same method to fit the new one? Makes sense!
I've just been told the single wire Bosch alternator will work, the 'other' wire isn't needed on the Bosch unit..the Haynes (often wrong) diagrams show the GS has 2 wires, and the RT alone has one wire. Think I'll just connect it up and hope the single wire plus the live feed does the job

 

[jacksdad63]

www.realoem.com

you need to know your month of manufacture as well as year

Parts changes occur twice a year (uplift) hence needing to know month of manufacture

its not set in stone as you also have run out run in of parts , so its not unuasual to find a part in early or past the uplift date

Real OEM says its the Denso unit, 60A. Looking like I need to return the Bosch and pay £600 for a used Denso one. Or scrap it, lots of Touratech and Wunderlich parts fitted

 

[Watty100]

Real OEM says its the Denso unit, 60A. Looking like I need to return the Bosch and pay £600 for a used Denso one. Or scrap it, lots of Touratech and Wunderlich parts fitted

I do believe they are interchangeable and this lead does the job of converting Denso to Bosch. I was lucky enough to find another Denso when mine broke so didn't need to buy this

Wiring repair kit

2 pin plug no. 610613

www.motorworks.co.uk

 

[jacksdad63]

I've fitted the Bosch alty now, all working. I just removed the Denso wiring tail which revealed the Bosch connector, very easy to do: hardest bit was getting the Ohlins shocker back in, I had to wind back the sprin adjuster collars so I could compress the damper, not difficult but it came out easy enough. I had to remove 'that sensor' on top of the block, right in the way of the alty, when refitting I bolted in the bosch unit then couldn't get the plug back in. I just filed off the side of the sensor thingy, gave just enough clearance to fit, rather than unbolting the alty again!
Now my only issue is its still charging at 15.64V, same as with the old, damaged alty! Is there another voltage regulator on these?

 

[crumbles]

The belts can get damaged from tiny bits of flint or road chippings that get flicked up and under the belt cover over time. They can also get nicked by the pulley ribs when fitting, which is why I used some plastic strips cut from an old milk bottle to ease the belts smoothly over the pulley then remove themonce the belt aligns with the grooves after rotating by hand.

Like mine had..lol..