[DeTomaso] 180 header rattle

[Asa Jay Laughton]

Here are some photos.  The last email got me back out to the shop to do a closer inspection.  Lo and behold the bottom bracket on the passenger side muffler is broken.  Two photos on that showing muffler laying in the bracket and one with me lifting it to show how it’s broken.

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These next series of photos show the crossover connections.  You can see there are two sets of brackets with bolts.  These are tight.  However, the tube closest to the camera below is free-floating from exhaust port 3.  It is tight at the exhaust port but is the source of the rattle with the tube it mates with.  Now granted because the bracket is broken on the muffler, it’s contributing to the movement.  I’ll get that fixed.

Please also look at the amount of blow-by in the form of black soot.  Yes, we know the engine has been running rich and we are tuning.  But should those connections be passing that much exhaust past?  That is what makes me think there should be some kind of gasket donut in there or something.
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I appreciate any and all thoughts.
Thank you,
Asa  Jay

Sent via radio waves

> On Aug 1, 2022, at 19:04, Asa Jay Laughton <asajay at asajay.com> wrote:
> 
> Hi Mirril,
> 
> The collectors are solid.  All four pipes on each side run into and are welded at the collectors. The collectors attach to the mufflers and all that part of the assembly is solid.  It may be I’m not communicating this correctly and need to provide a photo.  I’ll try to get that later.
> 
> I agree it would seem the other pair of crossover tubes should have a bracket but they never had that I can tell.
> 
> Asa  Jay
> 
> Sent via radio waves
> 
>> On Aug 1, 2022, at 16:31, mirrilm at earthlink.net wrote:
>> 
>> Asa,
>> 
>> Sounds like a bracket is MIA.
>> 
>> My brackets attach to the mufflers, that hold the collectors that hold the 8 pipes together.
>> 
>> I am on my second set from the same reputable vendor.
>> 
>> What happened with mine is the Nylock nuts melt in the heat, and then loosen the bolts that hold the collectors to the 8 pipes. Then you get blow-by from the loose collectors.
>> 
>> When I reassembled, I put a light skim coat of Hi-temp RTV inside each of the pipes, and have regularly checked the Nylock nuts for tightness and fit.
>> 
>> I am also going to use header wrap around where the pipes meet the collectors.
>> 
>> I keep eating slave cylinders and oil pressure senders from the excess heat and the blow-by (my bad).
>> 
>> /\/\
>> 
>> #6859 
>> 
>> -----Original Message-----
>> From: DeTomaso <detomaso-bounces at server.detomasolist.com> On Behalf Of Asa Jay Laughton via DeTomaso
>> Sent: Monday, August 1, 2022 5:56 PM
>> To: DeTomaso Mail List <detomaso at server.detomasolist.com>
>> Subject: [DeTomaso] 180 header rattle
>> 
>> Hi all,
>> I’m working on a Pantera with 180 headers.  Where the crossover is, two sets of tubes are held together with tabs and a small bolt, while the other two are not.
>> 
>> The issue is that the single tube from cylinder 3 is part of the crossover and the only place it bolts down is at the exhaust port, and it’s tight.  But it rattles something fierce over the mating tube at certain rpm’s.
>> 
>> Second issue is that all the joints at the crossover, four of them, are leaking exhaust.
>> 
>> 1.  Recommendations on stopping the rattle?
>> 2.  Are there supposed to be some kind of header gasket/donut in each of the crossover tubes to seal them together and prevent leaks?  Assuming there is supposed to be something there, I imagine it would stop the rattling too.
>> 
>> 
>> Thanks all,
>> :)
>> Asa  Jay
>> 
>> Sent via radio waves
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