[DeTomaso] best practice

[Sean Korb]

I had a problem with head bolt torque on my Windsor with aluminum
heads.  I don't know if it's mushrooming as much as the expansion and
contraction due to heat cycling of the aluminum compared to the cast
iron.  They will cycle at different rates and different amounts
putting stress on the bolts.

Definitely retorque if you have aluminum heads.  I've got pics of what
happened somewhere around here... :)

sean

On Mon, Nov 29, 2010 at 9:11 PM,  <wkooiman at earthlink.net> wrote:
> For what it's worth, I rarely retorque any bolts, but I often check the torque when I disassemble.
>
> The breakaway torque to remove the bolts is going to be greater than the torque to tighten the bolts.  That's because any lubricant would have dried up a bit.  But... the bolts have always been tight, with the exception of the outer row of head bolts on my A3 heads.  They are always much looser than I like.  I believe it is because the soft aluminum is mushrooming under the added heat on the outer row.  The inner row is kept cool with oil.
>
> Back to the original question:  If #2 leaked oil into the cylinder, it would have built enough pressure to bleed some junk into #1 - under/over/around/through the head gasket.
>
>
> -----Original Message-----
>>From: John Bentley <gndplne at yahoo.com>
>>Sent: Nov 29, 2010 12:48 PM
>>To: panteras <detomaso at realbig.com>, David in Durango <adin at frontier.net>
>>Subject: Re: [DeTomaso] best practice
>>
>>exactly!
>>
>>JB
>>
>>
>>--- On Mon, 11/29/10, David in Durango <adin at frontier.net> wrote:
>>
>>From: David in Durango <adin at frontier.net>
>>Subject: [DeTomaso] best practice
>>To: "panteras" <detomaso at realbig.com>
>>Date: Monday, November 29, 2010, 10:44 AM
>>
>>"Did Ford retorque the head gaskets after 500 miles back in the day?"
>>
>>No offense intended to anyone . . .
>>
>>After "you" (whoever that might be) have rebuilt 100 motors and rechecked every head bolt, let me know how many bolts needed to be snugged up.
>>
>>Old wive's tales (like retorque ing the head bolts) come about for a reason.
>>
>>Best practice is always best practice - no matter what anyone else does.  If you have doubts, ask those that do a LOT of the procedure.
>>
>>That's how we do it here in grouchy and dirty land, even under the snow.
>>
>>
>>
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso