Re: Grinding noise above 2800 rpm

["Rodney Trout" <troutster@domain.elided>]

 Gerry Djerrahian Wrote: 
  

   I began to have a terrible grrrrr sound that comes up when 	
accelerating after 2800rpm. 
 
 The jack shaft and water-pump are new including timing chains and
tensioners. I did have an unfortunate incident as I was driving to the 
body shop last year where the water-pump gears got stripped. The engine 
did overheat briefly. The heads are OK. I don't burn oil.  It never 
overheats. I have no coolant leaks and the water temp gauge never goes 
above 3/8.
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You will probably get many hits on your request, and it is very 
difficult to diagnose a fault without having a look at the car, but this 
is a simple thing to check up on:
	The water pump gears got striped  --- Why?

	Could it have been that when the pump was ever replaced, the uprated 
type was fitted (this also requires that the cover be replaced as well). 
There are two types of covers, one for the old style pump and one for 
the newer style. If the old type cover if fitted with the newer style 
pump, then I would imagine that gears will strip.

	So, what could be causing this noise you here?

As the engine heats up, the blades of the pump are rubbing the pump 
cover.

The above is just a guess, and I am not even sure that once the newer 
style pump is fitted this will allow the older type cover to be placed 
on, but it is easy enough to check into what type of pump was fitted and 
to which cover was fitted.

Good Luck


Rodney Trout
72 Stag
78 Spitfire




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