Gasket failures on rebuilt engine 282 1801

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bobhattler
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Gasket failures on rebuilt engine 282 1801

Post by bobhattler » Mon Oct 31, 2016 1:31 pm

Just replaced the exhaust gasket for the second time and now the exhaust manifold is leaking again. This after spending $250 on grinding the manifolds. It would appear that banning asbestos is causing a big problem.
Fred all the gaskets came from your suppliers, so if you could research the gasket makers to find a better product it would be appreciated.
Thanks for your help.
Bob hattler

Dave Czirr
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Re: Gasket failures on rebuilt engine 282 1801

Post by Dave Czirr » Tue Nov 01, 2016 7:39 am

Bob, I don't have a lot of experience here; I'd prefer the OEM style steel sandwich gaskets but I've used the modern composition (asbestos-free) gaskets a few times. Last time was on a 327 and that was perhaps 12 years ago, never a problem since. So perhaps there is another explanation for your recent gasket failure? I assume your manifolds were surface-ground with the intake and exhaust assembled as a pair? Fasteners all tightened more-or-less equally and to a reasonable torque?

bobhattler
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Re: Gasket failures on rebuilt engine 282 1801

Post by bobhattler » Tue Nov 01, 2016 2:26 pm

Thanks, they were ground at one time. We noticed the brass nuts were coming loose so I replaced them with steel nuts and lock washers. Maybe Fred has some hitech product I can put on the manifolds to stop the problem.
03/2014 new gaskets with rebuilt engine
04/2015 R/R exhaust gasket
06/2015 grind manifolds , new gaskets
01/2016 R/R exhaust pipe gasket install steel nuts on manifold
11/2016 R/R exhaust pipe gasket
11/2016 exhaust gasket leaking
The noise is audible and getting louder.

Old cars are so much fun.

Bob

dak955
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Re: Gasket failures on rebuilt engine 282 1801

Post by dak955 » Wed Nov 02, 2016 4:14 am

Bob...just curious but did you have the manifolds checked for cracks?.....I am sure you did but with all the work that you have done, I thought maybe there is a crack somewhere......good luck....

bobhattler
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Re: Gasket failures on rebuilt engine 282 1801

Post by bobhattler » Wed Nov 02, 2016 1:02 pm

Maybe it was mistake to remove the brass nuts as they could provide flex as the manifold rapidly heats . when we redo this time we'll lubricate the surfaces. (The brass nuts did loosen and possibly allowed gas to escape and erode the gasket.)
This becoming an expensive problem. My guys are searching for more durable gaskets. Without asbestos it may not be possible.
Thanks again,
Bob

Adam
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Re: Gasket failures on rebuilt engine 282 1801

Post by Adam » Thu Nov 03, 2016 8:26 am

The manifolds will move slightly with heating/cooling cycles, so it is necessary to retighten regularly at first, until the gaskets are well settled. A bit like the need to re-torque cylinder head studs after refitting.
"Do not underestimate the English cousin.....they are not as stupid as they look!" - Signor Altabani in The Italian Job.

Dave Czirr
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Re: Gasket failures on rebuilt engine 282 1801

Post by Dave Czirr » Thu Nov 03, 2016 8:40 am

Bob, I don't know if it has any contribution to the problem but lock washers are not specified for the manifold studs in those applications I looked at (1933 thru 1954), just plain steel flat washer and nut. You certainly don't want the assembly so tight that the two manifolds and the engine block are not free to move independently of each other. I rather doubt there is a torque specification for a prewar car but you could use the same specification used for the manifolds on postwar 282 or 288 or 327. I'm guessing the stud is 3/8 -24?

bobhattler
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Re: Gasket failures on rebuilt engine 282 1801

Post by bobhattler » Thu Nov 03, 2016 12:23 pm

Just ordered gaskets from Kanter.
I thought about the flex and do not understand how cast iron to cast iron would flex. Did the Packard dealers call you in to tighten all the @#$$%*& nuts, or could you expect to drive your car for 50,000 miles without messing with the engine. My car had 50,000 miles on it when I *&&^^%$#@ with engine. I should have left it alone.

Thanks
Bob

Dave Czirr
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Re: Gasket failures on rebuilt engine 282 1801

Post by Dave Czirr » Thu Nov 03, 2016 12:51 pm

It's not flex, it's expansion. The exhaust manifold will expand with heat more than the block because it reaches a higher temperature.

bobhattler
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Re: Gasket failures on rebuilt engine 282 1801

Post by bobhattler » Thu Nov 03, 2016 1:55 pm

As soon as I get the gaskets I will remove the lock washers and add the flat washers. I still go back to my last post, we should be able to assemble something without having to go back and redo constantly.
Maybe not.

Thanks

Bob

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