Series 3 Fan belts snapping

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WoodyO

WoodyO

Well-Known Member
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Afternoon all,

I had some issues with the fan belt snapping on a drive yesterday, I carry a spare but about 20 miles afterwards that snapped too.

Correctly tensioned and a new belt, so concluded it must have been the pulleys that caused it.

Whipped them off today and there's a build up of rubber in the base of the pulley. I'm hoping this was the cause, not letting the belt sit properly in the pulley.

New pulleys ordered rather than cleaning up the old ones, along with a bunch more belts just in case.


 
Is it 3/8 or 1/2 inch belt? as it looks like the belt has been touching the bottom of the pulley groove.

Generally v belts will take a load of abuse and still work just fine.
 
Everything turning okay, new alternator and water pump, no excess play in any bearings.

Dayco 10A1050C belt, so 10mm width.

I think it's been contacting the bottom of the groove only due to the build up of rubber.
 
WoodyO said:
Everything turning okay, new alternator and water pump, no excess play in any bearings.

Dayco 10A1050C belt, so 10mm width.

I think it's been contacting the bottom of the groove only due to the build up of rubber.
Click to expand...
I reckon you should have a 13mm belt, 10mm is only just okay to just drive an alternator on its own, but to drive alternator and water pump you need the wider belt.
Only reason it is touching the bottom of the pulley is the belt you had fitted is to narrow.
 
Appreciate the feedback, but the 10mm is the standard belt for the 2.25, OEM number returns the same size belt from different suppliers.
 
new pulley may help, But you could also wire wheel all the existing pulleys to give a nice smooth clean groove. I found that recently with and engine I fitted that had been standing for a while. chewed through several belts before fully cleaning up all of the pulleys and no problems since.
 
WoodyO said:
Appreciate the feedback, but the 10mm is the standard belt for the 2.25, OEM number returns the same size belt from different suppliers.
Click to expand...
With the 10mm belt, is the top of the belt flush with the top of the pulleys, or below the top?
New belt toothed or plain?
 
All sorted, thanks again for the input.

Fitted the new pulleys today and did a the 230 miles back home without any issue. Although I now have 3 spare belts just incase.

The toothed 10mm belt (Dayco 10A1050C) sits flush with the top of the pulley, no sign of bottoming out at all.

I'm confident the pitted surface of the old pulleys, coupled with a build up of rubber in the bottom of the groove was to blame.

Would have cleaned up the old pulleys had the new ones not been available next day, but they'll be kept as spares just in case.
 
Last edited:
WoodyO said:
All sorted, thanks again for the input.

Fitted the new pulleys today and did a the 230 miles back home without any issue. Although I now have 3 spare belts just incase.

The toothed 10mm belt (Dayco 10A1050C) sits flush with the top of the pulley, no sign of bottoming out at at.

I'm confident the pitted surface of the old pulleys, coupled with a build up of rubber in the bottom of the groove was to blame.

Would have cleaned up the old pulleys had the new ones not been available next day, but they'll be kept as spares just in case.
Click to expand...
You were lucky they were available next day when I did mine I ordered them and cleaned up the old ones as a stop gap which then sorted and solved the problem so the new ones are now sat on the shelf as spares!
 
There's a great little independent called A L Services in Poole, Dorset if anyone is that way. Good service and has daily deliveries.
 
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