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Join Date: May 2014
Location: Italy
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Intake gaskets to cylinder head: dry or seal?

Hi,
this is my first job on intakes.
I'm preparing for carburators reinstallation so

I've machined intake manifold surfaces and bought:

6 carburator to manifold gaskets
6 intermediate flanges
6 manifold to intermediate flange gaskets
6 cylinder head to intermediate flange gaskets.

Those gaskets are the green "Porsche original" and marked as "REINZ".

Reinz online documentation says to not use any sealant but just to be sure that the head surface is flat and oil or old gasket free.

I 've completely removed the previous gaskets, gently cleaned the surface with a piece of sanding paper but I can't assure that the surface is flat because engine is in the car and cylinder head can't be machined.

I have a question about installation of the gaskets going beetween cylinder head and intermediate flange: do I have to use a sealant or they go dry ?

Wich one is the best approach ?

Excuse for question but I'll hate to suffer an air-leak after 10 labour hours
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Old 02-24-2018, 12:36 PM
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Just remove remains of the old gasket and install the new dry. It'll be fine!
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911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI
911T Coupe -69, 3.6, G50, "RSR", track day.
Old 02-24-2018, 12:53 PM
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Second that. Always dry and very clean.
Old 02-24-2018, 05:42 PM
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Agreed. One word of caution though: be very careful w/ sandpaper. You risk making low spots on the mounting surface. I have had great luck using a razor blade or putty knife to remove old gasket w/ little risk to the mounting surface. Alternately you could use a scotch brite pad as its less aggressive than sandpaper. With either the scotchbrite or sandpaper watch that you don't get abrasive down the intake port.
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'73 911S (long term ownership) '70 914-6 (long term project) '74 914-2.0 (sold)
Old 02-24-2018, 06:41 PM
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Thank you for all suggestions.
Previous, and probably original, gaskets were paper made and glued/sealed.
I used a chisel head to remove the main part and the sealed part has been carefully removed using sandpaper.
I also discovered that wd40 is way better than gasket remover products, propably because it soften the paper.
At the end simply cleaned the surface with sanding paper and wd40... Someone will say wet sanding process.
Surface seems ok, bright and dry now...

Let's hope it will be also leak free
Old 02-25-2018, 09:43 AM
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