Engine Tapping Noise :(

[jdbubb at verizon.net (Dan Bubb)]

Edited the following line:
Course the other thing it could be would be rod knock. Heavier sound but it starts out as a tapping sound and gets louder. If caught early enough it might not damage the crank and replacing the bearing shell may fix the problem. Visual inspection of the crank bearing surface and plastigage check would be required.


From: "Dan Bubb" <jdbubb@verizon.net>
To: <haygood@myway.com>; <scirocco-l@scirocco.org>
Sent: Tuesday, November 14, 2006 6:58 AM
Subject: Re: Engine Tapping Noise :(


I don't believe the head will need to come off. The tapping is typically a failed hydraulic lifter, so just replacing that should do the trick unless its damaged a cam lobe. Mostly the valve and spring aren't damaged by this unless it goes on for an extended time, then the shock loads may do some damage. Bentley has a procedure for testing the lifters. I've never actually identified a bad lifter using the procedure, but that's where I'd start.
Course the other thing it could be would be rod knock. Heavier sound but it starts out as a tapping sound and gets louder. If caught early enough it might not damage the crank and replacing the bearing shell. Visual inspection of the crank bearing surface and plastigage check should be sufficient.
Dan

From: "Brian Haygood" <haygood@myway.com>
Sent: Tuesday, November 14, 2006 1:03 AM
Subject: Engine Tapping Noise :(


> 
> So, I've got a loud tapping noise apparently coming from the exhaust valve area of my number 3 cylinder.  It started out as a slight tap above 3krpm but rapidly changed to a constant loud tapping noise.  
> 
> 
> 
> Obviously the head has to come off.  What parts are likely to have been damaged and need replacement?  Is the head itself damaged by this?
> 
> 
> 
> Also, what parts would you normally replace when rebuilding a head with no known problems?  I'm not asking for a list of gaskets - do you replace valve springs? hydraulic lifters? valve guides? 
> 
> 
> 
> I'm dealing with heads from PL and 9A 16v's.
> 
> 
> 
> Thanks.
> 
> 
> 
> Brian
> 
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