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Re: [T3] AT pan gasket "fix"


here locally they sell flange head metric bolts I suppose they also would 
help.


----- Original Message ----- 
From: "Jim Adney" <jadney@vwtype3.org>
To: <type3@vwtype3.org>
Sent: Wednesday, August 25, 2004 7:38 PM
Subject: [T3] AT pan gasket "fix"


> For those of you who have gone thru the trouble of getting a distorted AT 
> pan
> gasket to reseal, I think I have a kind of a fix.
>
> Well, it's not really a fix, because once the pan is distorted you have a
> difficult problem. What I have is a way to keep the pan from distorting in 
> the
> first place.
>
> The pan is held on by 13 8mm bolts. The pan distorts because the bolts 
> exert
> all their clamping force right around the inner edge of the bolt hole. It
> doesn't take much overtightening to bend this lip inwards, so that the pan 
> is
> no longer flat. If you've done this job, you already know that the torque 
> spec
> on these bolts is already quite low: 7 ft-lb. If you try to give these 
> just a
> bit more tightness you'll ruin your pan.
>
> I've found some very strong Belleville washers which are also called 
> conical
> disk springs and just look like deformed (conical, not wavy) flat washers. 
> If
> you put these under those bolt heads (with the large end of the cone 
> against
> the pan) the bolt force will be spread over a perimeter that is more than
> double that of the original setup. This means that we are now less than 
> half as
> likely to bend the pan. I still don't recommend increasing the torque.
>
> $15 will get a set of 15 (2 spares!) of these special heavy-duty 
> Belleville
> washers delivered to your door.
>
> I just installed these on my '71 and they fit perfectly. Just remember to 
> leave
> out the original split ring lockwashers when you install these. You can 
> install
> them without removing the pan or disturbing the gasket if you just remove 
> every
> 3rd bolt at a time and reinstall.
>
> Email me privately if you're interested.
>
> -- 
> *******************************
> Jim Adney, jadney@vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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