Xsara xud engine and vacuum brake problem

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xsara98
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Xsara xud engine and vacuum brake problem

Post by xsara98 »

Hello,

Im new on here and I hope someone can help with a problem with my xsara 1998, running a xud9te engine.

I will set the scene, basically the aux drive belt failed on the motorway at speed and with a loss of power the engine would start but not idle.

I assumed that part of the belt had caused the cambelt to skip so it was recover home., using the old belt which was due to be changed anyway the timing was reset up and with fingers crossed it was fired up.
After an intermittent misfire on one cylinder and alot of smoke the smoke cleared and the misfire cleared and now the engine fires up/runs and sounds nice hot and cold so i hoped i had got away with it.
Anyway i went to get the car tonight and found that the brakes do not have any vacuum. Hard pedal etc.
I checked all the pipes and everything seems fine, i noticed that the vacuum is produced by a unit on the end of the cam.

So my question is how could the pump fail at the same time as the cambelt skipped? i see its just driven by the cam but i cant see why one could cause the other.

Any thoughts on possible causes

Cheers

Mark
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myglaren
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Post by myglaren »

Have you tried turning the vacuum pump pulley?
Could be that the pump bearings have seized and chewed the belt up.

Welcome to the forums, hope we can help you get to the bottom of the problem.
xsara98
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Post by xsara98 »

Hi,

Thanks - the pump bolts straight into the end of the cam on the end of the head so it doesnt have a pulley.

Im definatly sure the aux belt failed and a bit went up the cam cover and caused a skip of the cambelt. I just cant understand how that could cause the brake vacuum pump to stop working on the other end of the cam shaft- i guess these units dont fail much - the car has 190k miles but its all motorway.

Cheers
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myglaren
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Post by myglaren »

Can you disconnect the vacuum pipes and check the pump is working?

Do not put your hand over the suction tube - us a bit of plastic, something that will not come to bits and get sucked in.

Could be down to coincidence although that is unlikely.
xsara98
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Post by xsara98 »

Hi,

No i pulled one of the pipes and it seemed to be doing nothing.

I will pull it off tomorrow and see what transpires- i suspect will involve more money:-)

Cheers
wheeler
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Post by wheeler »

You will probably find that the dog drive on the pump broke up when the belt jumped.
citronut
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Post by citronut »

fingers and every thing elss crossed you aint got a snapped cam shaft then,

i know you say the engine is running now

regards malcolm
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