Cam belt change interval?

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Post by Defender110 »

MULLEY wrote: I've only ever heard of quinton hazel cambelts breaking sooner than 48k.
Not necessarily a QH fault as a recent survey (can't remember by who) in to high cambelt failure rates suggested most failures where due to poor fitting rather than the cambelts themselves.
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Post by kiwi »

mat_fenwick wrote:
kiwi wrote:Harry Haynes says 36,000miles
Interestingly (or not!) my Haynes manual gives 45k miles and 5k miles service intervals, changing to 6k after 1989. My 1993 Citroën service manual states 48k miles.
Now you mention it I checked the 3 versions I have and yes in the Citroen Diesel manual it does indeed say 45k miles and service intervals of 5k.

The other two petrol BX manuals earlier brown and later blue version state 36k.

I also checked the documentation when the TXD had its done when I got the car and it says 45k as well.

Does this mean the Diesel is less riskier to belt snap?

On a side note several years ago the cambelt went on our korean vauxhall astra copy. And we had a lucky escape from damge! The one time that stopping for a Burger King actually was worthwhile. Had I not been reversing into a park bay I would have been doing 100kph when it snapped.
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Post by JayW »

kiwi wrote: Does this mean the Diesel is less riskier to belt snap?
Apparently so, on the basis that it doesn't rev as high which puts less strain on the belt.

I also have a vague recollection from years ago that the increased compression rate increases inertia in the bottom half of the engine making the top half easier to turn (once in motion)... Not sure how acurate that bit is though, never gave it much thought!
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Post by BX Meteor »

/\ if true that its due to momentum, then more likely due to heavier pistons, but I don't see how that makes it easier for the camshaft to turn. More likely that the rate of change of momentum in a diesel is less than in a petrol
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Post by mat_fenwick »

We need calculations to prove it!
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Post by citsncycles »

kiwi wrote:

Does this mean the Diesel is less riskier to belt snap?


Apparently so, on the basis that it doesn't rev as high which puts less strain on the belt.
Makes sense - I belive the 14's have shorter intervals than the bigger engines

On a side note several years ago the cambelt went on our korean vauxhall astra copy. And we had a lucky escape from damge! The one time that stopping for a Burger King actually was worthwhile. Had I not been reversing into a park bay I would have been doing 100kph when it snapped.

Although certain engines are inherently good or bad at surviving belt failure, it is a bit of a lottery. I've known one engine bend every valve at tickover, another destroy itself on startup, yet another run perfectly fine with a new belt after the old one snapped at 40mph.
Is 2004 when the belt was changed a little out of touch ?

Change it ASAP! An ex boss had the cambelt go on his Alpha after 30,000 miles, but 8 years service. It cost over a grand to fix, and the car was almost scrapped because of it.
Last edited by citsncycles on Wed Mar 21, 2012 11:17 am, edited 1 time in total.
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Post by BX Meteor »

mat_fenwick wrote:We need calculations to prove it!
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Post by citsncycles »

Apologies for the state of my last post - bloody quote marks :twisted:
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Post by ben »

Well i rang my local citroenist garage to book it in and asked what the interval was and they said 82,000 or 7 years on this one. :)
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Post by kiwi »

ben wrote:Well i rang my local citroenist garage to book it in and asked what the interval was and they said 82,000 or 7 years on this one. :)
THat will be in Kilometres then :wink:
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Post by ben »

..well they said miles but yes it's an odd figure why not 80 or 70 not 82 so you could be right there :? oh well it will have been on 7 years end of next year and i won't have done 82k kms or 50,000 miles on it by then anyway :lol:
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Post by Discoil »

It was 48,000 miles for the BX and then 72,000 miles for later models
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Post by MULLEY »

Brilliant garage :roll: giving out the wrong info. I presume all XUD engines regardless of which car they were fitted to & when the car was in production is still 48k or 5yrs? I presume the DW8 engines & all the other slight variants are 72k?
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Post by Dollywobbler »

MULLEY wrote:Brilliant garage :roll: giving out the wrong info. I presume all XUD engines regardless of which car they were fitted to & when the car was in production is still 48k or 5yrs? I presume the DW8 engines & all the other slight variants are 72k?
See Discoil's comment. My Pug 306 XUD was a 72k interval. Not that I left it that long.

Where an iffy belt can become an issue is the emission part of the MOT test, which involves ragging the engine until the limiter cuts in. That stresses the belt. Any belt older than five years I would change ASAP to be honest.
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Post by Discoil »

I'll order a belt tomorrow

Better find all the locking tools and get it done

To be honest about it , I didn't think it was such a while since it was done until I read and followed this thread. :shock: Many thanks .
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