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[Terbs]

Hi all,
The 2.5 Elite has been stood for a month. Battery was a flat as a witches tit. However, attaching a starter pack gave a first time start.
But although the engine sounded sweet, there was a noise coming from the front...Bonk, bonk, bonk, very loud. After throttling, the noise disappeared, but came back at idle....bonk bonk......bonk.....bonk, bonk, bonk, but got softer, until after the engine has been idling now for an hour, with the odd revving up, you can barely hear it. I know its there....very very soft, and intermittent. Can a water pump bonk as well as squeal. Is the water pump on the 2.5 the one to the right of the auxiliary tensioner. TB told me once, but I have forgot !!! The noise seems to be somewhere in that area

[Diamond Black Geezer]

Same issue myself, it appeared one day, and pretty noticeable. Not all the time, maybe only when cold. Before I was able to trace it the bleeding thing's disappeared again! Water pump's directly above the crank, sorry to not be of more help.

[Terbs]

No probs, DBG. At least I am on the right pulley. However, its hard to locate exactly where the noise is. For one nasty moment I thought the cambelt was breaking up, but that is new, and I am sure the noise is not that. If the water pump was bonking, would that sound vibrate against the cambelt cover.

[Diamond Black Geezer]

It's a thought. I had a 'psh psh psh' noise which I think MarkDTM recommended loosening and then drifting up the timing belt cover, as they cometimes catch. The noise seems to have gone away, too, as my car does tend to cure herself if you wait long enough 

Another method of diagnosing noises is to remove the Aux belt (for a short period of running only, of course) if the noise persist, then it's not coming from said belt/associated pulleys.

[Terbs]

Did think that, about the belt. Is that just a case of levering the tensioner nut with a spanner, then slipping the belt off. Obviously make sure its clear of everything. Then just start the engine

[Diamond Black Geezer]

Yes, simple as. I've got a 1/4mile long breaker bar which I use. Not a nancyboy thing, it's just you can control the amount of pressure on the tensioner so easily. It's not pretty when they slip off the socket and spring back! Loud noise = new underwear!

There'll be a diagram on here somewhere but to make life easy for yourself just make a quick note of the routing. I was mucking about 15 mins when I changed my belt before relenting and googled it!


Note: depending on your car, but at the time I had all the air con and intake junk out of the way when I changed my belt, so you may have more of a fiddle getting the belt out yours. But in essence, as above, release tensioner and pop belt off. 

[Terbs]

Thanks DBG....TB did a belt for me a short while back on this car. He made it look easy... Did take a few bits off though. I'll give it a crack tomorrow....got it charging now

[STEMO]

At least your car is still capable of bonking, Terbs. 

[Terbs]

At least your car is still capable of bonking, Terbs. 

That's more than I am, matey

[05omegav6]

Might simply be lifter noise... Takes a while for the oil to get back up into them if stood for a while

[STEMO]

Might simply be lifter noise... Takes a while for the oil to get back up into them if stood for a while

I don't think lifters 'bonk'. More of a 'tap'. 
Or a 'clack' 

[Terbs]

Might simply be lifter noise... Takes a while for the oil to get back up into them if stood for a while

I did think that possibly, Al....but they usually make a clacking noise, and this was not in the right place. I have had that happen with the lifters (I assumed) with the other car, but this noise was different. 'Bonk' is the only way I can describe it. I'll try tomorrow again....and if it is 'bonking', I'll try to record the sound.

[05omegav6]

Might simply be lifter noise... Takes a while for the oil to get back up into them if stood for a while

I did think that possibly, Al....but they usually make a clacking noise, and this was not in the right place. I have had that happen with the lifters (I assumed) with the other car, but this noise was different. 'Bonk' is the only way I can describe it. I'll try tomorrow again....and if it is 'bonking', I'll try to record the sound.

When I fired up the white one after six weeks, I thought the cambelt had jumped such was the racket

[RolandL]

Hi terbert, just a thought. Have a good look at the aux belt tentioner pulley. Look for signs of the pulley breaking up,melting. A couple of years ago i had a pulley fail,the inner rubber wore, melted and there was a similar sound. I never realised what was going on until i started to loose electrics and power steering. When i had a good look, the pulley had created a larger hole so was not running as it shoud,hence the "bonk" . Suprisingly the pulley never parted company with its fixing.


Might be worth a look.

[Terbs]

Thanks Roland....
I don't think its the tensioner, and I have had a new one...like yours, melted, and fell apart. Worth a closer look though