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Posted

I can't comment on the HDi change interval - my manual's a few miles away !!

 

but

 

http://www.honestjohn.co.uk/forum/post/index.htm?t=7920

 

has an interesting formula :

 

Take a belt base life of 60,000 miles.

 

Now apply the following factors as multipliers:

 

Crank pulley teeth (half cam pulley number) 19t 0.7; 20t 0.9; 21t 1.0; 22t 1.05.

 

Next, apply the following factors as multipliers:

 

Fixed tensioner 1.0; Undamped sprung tensioner 0.8; 3/4 wide belt 0.75;

1 wide belt 1.0; Diesel engine 0.85.

 

As an example, the old Ford CVH 1.4 engine had 19 teeth on its crank pulley (0.7), a fixed tensioner (1.0), and a 3/4 wide belt (0.75).

 

Change interval becomes 60,000 x 0.7 x 1 x 0.75 = 31,500 miles.

Posted

Thanks (I think!). Sounds a bit complex and far fetched to me. Begs the question - how many teeth are on the pulley?

 

I'm trying to weigh up service costs wrt to buying cars at certain mileages.

 

had mine done @ 100k, told 60-70k safest option, but worst option is after belt breaks. if in doubt, change it

Posted

had mine done @ 100k, told 60-70k safest option, but worst option is after belt breaks. if in doubt, change it

 

I just had a look in the service handbook from my C5 - HDi engines are at 100k miles for normal wear, or 80k for severe ...

 

Hope that gives you good news <_<

  • 2 weeks later...

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