[DeTomaso] Puckered Oil Pan Bolt Holes

Dave Londry davel at emspace.com
Sat Apr 16 16:10:56 EDT 2011


I don't think that much twist will noticeably change the clamping load 
on the gasket.
(Unless the pan is crazy stiff)
And I didn't notice you mentioning having done anything to twist it - so 
it probably came that way.
dave


On 4/16/2011 12:48 PM, Mike Thomas wrote:
> Clarification, this is an Armando aluminum pan.
>
> Thanks Jack.  After I laid the pan over the block, I realized the the same
> thing.  I've ball peened the puckers down and each side is flat to itself
> but now have a very slight (~1/16-3/32) twist in the pan when I lay if
> upside down on my woodworker's bench.  I get the same measure of twist when
> I drop the pan back onto the block.  Feeling I need to eliminate the twist
> to put an even load on the gaskets, I'm thinking I'll lay the pan top down
> on the garage floor with one corner supported by a thickness just larger
> than the twist and apply some weight straight down on the pan to get it to
> move.
>
> May sound pretty basic, but I don't want to have to buy a new pan, and don't
> want to have to pull it again to redo the gaskets if they start leaking.
> This has to get done right the first time.
>
> Thanks again
> Mike Thomas
>
>    _____
>
> From: JDeRyke at aol.com [mailto:JDeRyke at aol.com]
> Sent: Saturday, April 16, 2011 11:59 AM
> To: mbefthomas at comcast.net; detomaso at realbig.com
> Subject: Re: [DeTomaso] Puckered Oil Pan Bolt Holes
>
>
> In a message dated 4/16/11 10:40:45 AM, mbefthomas at comcast.net writes:
>
>
>
> My first thought is to lay the oil pan on the upturned engine, and with a
> flat-end block of hardwood over the bolt hole area, tap it back to flat
> until the area is once again flush to the edge of the block.
>
>
>
>
> Better would be to lay the pan on a board and tap the puckers down with the
> ball end of a ball-peen hammer. You'll need to exercise some care, though.
> IMHO the iron block won't yield enough to allow the metal to go past the
> 'neutral' point and spring back to flat. If you go too far, tap it back the
> other way again. This is simply bodywork. If you don't have a ball-peen, a
> large punch can be used with a std hammer. The key is only hitting it as
> hard as is necessary. And be more careful tightening the little bolts- they
> only take about 5 ft-lbs of torque&  usually break before overtightening.
> Good luck- JDeryke
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