NG engine knock

[Bill Green]

It is an engine which was used by Audi to train mechanics out in the
Midwest. It had never been run. All the parts are literally brand new. I
checked all the bearings cap torques on the rods and main bearing caps and
ran a compression test before installing the engine (210 psi avg). It all
seemed fine.


-----Original Message-----
From: Huw Powell [mailto:audi at humanspeakers.com] 
Sent: Saturday, June 09, 2012 8:57 PM
To: Bill Green
Cc: quattro at audifans.com
Subject: Re: NG engine knock

Define "new NG engine" first?

On 6/9/2012 8:34 PM, Bill Green wrote:
> Just put a new NG engine into my 4kq. Using the starter to turn it 
> over resulted in a knock noise very much like a big end rod bearing 
> was shot on one or more of the cylinders. I took all the plugs out 
> then reinstalled a single plug in the cylinders one at a time turning 
> the engine over each time. I thought that would show me which cylinder 
> was making the noise. But they each sounded completely normal when I 
> did this! Then I discovered that putting any two plugs in resulted in 
> the knock noise returning! This is 10-1 compression engine could that 
> noise be normal? I'm afraid to try and start this engine until I get 
> past this problem. By the way rotating the crank through a complete 
> cycle with the plugs out is very smooth with nothing striking 
> anything. Any thoughts??? I don't want to re-pull this engine if I 
> don't have to! J
>
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