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V8-250 Saloon: Fan Belt - Solid or Tooth

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classiclife
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V8-250 Saloon: Fan Belt - Solid or Tooth

Post by classiclife »

Hello,

At some stage a PO of my 1968 V8 saloon must have changed either the WP pulley or (more likely) the Alt pulley.

As such, the correct fan belt (C27354) from DMG is too big - even with the Alt at its maximum adjustment and I need a smaller belt.

Does or should the fanbelt be solid, or are saloon owners also using tooth / cogged belts ??

The fan width I know is 12.5mm / 13mm and I reckon I will need a 762 or 750 size belt, I have yet to try the fitment. The correct belt size should be 775.

Any info, greatly appreciated with thanks.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

A.N.Other
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by A.N.Other »

I don’t think it’s a toothed or cog belt as such. They are V belts in the old tradition but have the relieved section on the inner section for efficiency. If you have a small pulley on your water pump or alternator due to the fact they are not standard items then don’t hesitate in going the hole hog and fit the best none standard item you can.
Colin,
I may be slow but I’m rough as well !

classiclife
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by classiclife »

Thanks Colin, that is useful to know regarding the fan belt design / wording.

I remember very well and still have some, Unipart GCB fan belts which of course then, were referred to as cogged belts. I like the idea of the V section with relieved sections. Things are looking up !!

Out of interest I will measure the WP & Alt pulley diameters to ascertain which of the two have been changed.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

lomh 13
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by lomh 13 »

You can take off the tensioner bolt. Then you can turn anti clockwise your alternator a bit more. When the belt is in the pulley you reffit it
Robert
What looks right is right

tjt77
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by tjt77 »

Can't advise on belt ID number or sizes.. the alternator equipped cars have a shorter belt due to smaller pulley. (alternators spin faster to make the extra wattage) The important thing about belts is their quality.. some do come with 'teeth'..which theoretically should grip better, but would also wear faster due to less surface area doing the work..
here in USA I use 'Gates' brand.. because they are known to be very good quality..(Id compare Gates belts with Michelin tyres regarding quality and lifespan) basically if there is not a 'listing' I take the old belt to my local parts store, they measure its dimensions..check the Gates catalogue for a size match, and then provided the belt from their belts section behind the counter.. Sometimes I get 3 belts.. 1 as close in size match as poss.. 1 slightly shorter than the pattern belt and 1 slightly longer.. I determine which is the best fitting one back at the cars location.... and return the others ..

classiclife
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by classiclife »

Folks,

Thank you for all your replies - much appreciated.

Problem now resolved, by using a Gates 13x725HD V-belt................ fully agree that Gates is one of the very best out there.

I suspect at some stage one of the pulleys, I mentioned earlier, has been changed but not sure why that would be unless defective and a correct size spare could not obtained.

Will report back, in due course, when I have measured each of the pulleys.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

classiclife
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by classiclife »

Hello,

Hopefully someone with a slim bumper V8 saloon with an alternator, can assist, please ??

I will be very interested to know what the diameter of the alternator pulley is on these cars - especially if you have the original Lucas 11AC alternator.

Got rid of my 11AC as it was in a pretty bad state and went for a higher output unit - sold via SNG. At the time, I had assumed that the pulley on the discarded 11AC was the correct item - needless to say this is now in question and hence the request.

If you can assist, it will be very much appreciated.

Thank you in advance.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

classiclife
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Location: Ridgewood - East Sussex
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Re: V8-250 Saloon: Fan Belt - Solid or Tooth

Post by classiclife »

Hello,

The mystery of requiring a smaller fan belt has now been solved.

I swapped my 11AC which was poorly, with a higher output alternator from SNG - the swap over is straight forward.

However, the overall physical size of the SNG unit is slightly smaller than the original Lucas 11AC. As a result this makes the alternator pulley sit lower down and the correct V8 saloon belt (775) becomes oversize, hence the necessity to reduce the fan belt dimension to 725 which does the job perfectly.

With regard to suspecting that a smaller pulley has been used, this is not the case as per the above explanation.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

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