<VV> Overheating - Deflashing Heads + rocks in lower shrouds

Mark Durham 62vair at gmail.com
Tue Jul 27 10:26:26 EDT 2010

Charles, Actually, I've never heard of a oil leak causing a cooling problem.
Cooling problems come from the heads, usually the oil does not get that far
out, it just runs down the case and cooks on the lower cylinder areas, which
are primarily cooled by oil spray from the inside.

Also take a look at your oil cooler fins while you have the tin off, and
make sure they are all clean. I use the Wally World brand of brake cleaner,
it cuts through most greases and oils, don't breathe it though, its deadly

Deflashing is the removal of extra aluminum in between the fins on the heads
that is there from the foundry process. The heads are cast in molds that are
put together and the flashing material oozes out where ever there is a hole
or gap between the two mold halves.

The flash material prevents adequate air flow and so you get hotter heads.
Long drill bits of approriate size, 3/32, 1/8, etc., hack saw blades in hand
held holders, and tiny flat files are all a good source of removal tools.
Its time consuming and back breaking work, but well worth it if the need is
Remove the lower tin so you can make sure you get it all blown out.

Mark Durham
On Mon, Jul 26, 2010 at 2:30 PM, Charles Lee <Chaz at properproper.com> wrote:

> Funny, but nope, actual rocks ... among all the tar pit that collected over
> the years, from what is probably a leaking top cover ?
> When I remove the shroud, I expect to find a leaking top cover dripping
> down
> over the jugs, and causing my overheat problem ?
> I hope that's all it is, although deflashing is a good idea while I'm at it
> ?
> How do I deflash ?
> Charlie
> ----- Original Message -----
> From: "Jay Pitchford" <jay.pitchford at gmail.com>
> To: "Charles Lee" <Chaz at properproper.com>
> Cc: "Bill H." <gojoe283 at yahoo.com>; <virtualvairs at corvair.org>
> Sent: Monday, July 26, 2010 2:01 PM
> Subject: Re: <VV> Overheating - Deflashing Heads
> Blue stones? I'd bet it's petrified critter poop!  :-D
> On Mon, Jul 26, 2010 at 4:50 PM, Charles Lee <Chaz at properproper.com>
> wrote:
> > Interestingly, when I removed the right lower shroud, I found about a
> > pound
> > of blue stones (road gravel ?) fell out, only on the right side ? Like
> > someone used the fan as a cement mixer ?
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