<VV> rebuild 140 engine noise

[J R Read_HML]

Possible head gasket, but I would describe that sound as more of a chirp 
than  a hiss.

Later, JR


----- Original Message ----- 
From: "Michael Kovacs" <kovacsmj at sbcglobal.net>
To: "VV" <virtualvairs at corvair.org>
Sent: Wednesday, May 17, 2006 4:44 PM
Subject: <VV> rebuild 140 engine noise


> I just started my 140 today after a 6 month partial rebuild. With only 
> 6,000 miles on it, the block was not split . The heads were reworked to 
> reduce the squish height to about .032. The CR was calculated at 9.26:1. 
> The heads have all new valves, springs, guides etc. with only 6,000  miles 
> on them.
>
>   The engine was very carefully rebuilt. I can't believe it could be a 
> piston or cylinder problem. The seats were not loose.
>
>   The problem is when I fired the engine it ran for about 30 seconds  at 
> about 1500 RPM and then developed a sharp hissing sound on the left side 
> like a single cylinder compression or combustion leak. It was very evident 
> over the muffler less engine exhaust sound. It was immediately shut down.
>
>   Upon shut down I checked the rockers for any type of out of the ordinary 
> condition. They were cold adjusted at rebuild. There was nothing evident. 
> #4 sparkplug was normal.
>
>   I did a compression check and #4 was only 110 lbs. The rest were as 
> expected at about 190. While doing the comp check there was a sharp 
> "clack" noise consistent with one cylinder making it. I'm assuming that 
> something happened in #4. I'll do a pressure check tomorrow on #4 with a 
> homemade modified spark plug and listen for escaping air noises.
>
>   The rockers on # 4 were removed to eliminate any valve motion and the 
> "clack was still there.
>
>   Anybody have any thoughts on any other diagnostic trick to be used 
> before I pull the left side off? I wont pull the whole drive train again. 
> I don't have a bore scope to look into the cylinder.
>
>
>
>
>
>
> MIKE KOVACS
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