Knock knock

[AlRaven]

Got a gentle intermittent knocking from front top of engine - mainly when warmed up, doesn't sound too bad but got me a bit worried now - any clues? water pump?

[Dr Mike Oxgreen]

What sort of speed of knocking? I assume it's related to engine speed rather than road speed?

If it's related to engine speed, are you able to estimate how many knocks you're getting per second with the engine idling? If you can almost count the knocks (i.e. about 6 to 7 per second), then it's either cam/valve related or something else that happens only once every other turn of the engine (e.g. a blowing exhaust port).

Edited by Dr Mike Oxgreen on Tuesday 22 May 12:52

[AJV8]

Sorry to Hijack this post but i've also got a knocking noise. It sounds as though the fan is on in the car when it's not. Opened the bonnet earlier and it sounds a bit tappetty and if i give a little rev before lifting off it makes a louder knocking noise.

Hope this description helps. I read that original post and got worried... Any ideas ?

AJ

[AlRaven]

It's engine speed related, about 2/3 times a second for say 5 seconds - then goes for say 5 seconds and comes back.......

[rickprice]

I had something similar and it turned out the bonnet release cable was rubbing / vibrating on another cable (cannot remember which) where they crossed.

Might be something similar?

Rich

[Chilliman]

Top end noises have been discussed here http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Might be useful....

Chilli