MGExp

MGB & GT Forum

exhaust manifold

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

68MGBken Ken A
North Branford, CT, USA   USA
what is the best gasket sealer if any for the intake/ exhaust manifold?



Edited 1 time(s). Last edit at 2017-07-16 09:27 AM by 68MGBken.

. Hide banner ads & support this website by becoming a > Supporting Member <
dickmoritz Avatar
dickmoritz Gold Member Dick Moritz
Philly 'burbs, PA, USA   USA
None...

If you have leakage at the manifold-to-cylinder head interface, check to be sure the mounting flanges of your intake and exhaust manifolds are the same thickness. Manifolds originally from HS4 setups have mounting flanges 9/16 thick; those from HIF setups are 7/16 thick. It is common to find a mis-match...

Dick

In reply to # 3552911 by 68MGBken what is the best gasket sealer if any for the intake/ exhaust manifold?



Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

Steve S. Stephen Strange
Harrisonburg, Virginia, USA   USA
1972 MG MGB MkII "The Mouse Trap"
Ken-
Do not use ever gasket sealer on an exhaust manifold. Find out why it's leaking and treat the cause, not the symptom (i.e., the leaking gasket). The sealing surfaces of the manifolds and the cylinder head need to be on the same plane and flat, respectively. Any decent machine shop should be able to accomplish this for a very reasonable price.

Some gasket manufacturers make an embossed intake manifold gasket that uses a perforated core. Unfortunately, the embossings on a perforated core are often unable to withstand the pressure when they are torqued into place. As a result, their embossings tend to collapse, losing their clamping force, and leakage ensues. As a response to this problem, the engineers at Fel-Pro have designed an intake manifold gasket using an embossed, solid core design coated with a plastic resin material as the carrier for a molded silicone sealing bead in order to permit far superior sealing and clamping force. While the molded rubber bead does the actual sealing, the resin carrier keeps the gasket in place underneath the embossing and assures uniform pressure. When properly installed, this type of gasket assures an even load around the ports, which avoids vacuum leakage and, best of all, its design stands up over time. It is available from Fel-Pro as part of a complete six-piece kit that includes high-quality phenolic insulating spacers (Fel-Pro Part # 23555) for insulating the carburetors from heat that has been conducted through the intake manifold.



Edited 2 time(s). Last edit at 2017-07-16 01:43 PM by Steve S..

. Hide banner ads & support this website by becoming a > Supporting Member <
dipstick Avatar
dipstick Kenny Snyder
La Center, Washington, USA   USA
1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
None, no gasket sealer in my experience. The exhaust/intake cylinder head gasket surface can be resurfaced, and the exhaust/intake manifolds also resurfaced. When tightening the exhaust/intake manifolds tighten from the center toward both ends a little at a time to provide the gasket time to crush, and the manifolds to relax toward the ends not humping up in the center. It may be helpful to loosen the connections between the exhaust manifold and the down pipe in case the manifold is being tipped up or down.



Be safe out there.
Kenny



Edited 1 time(s). Last edit at 2017-07-16 01:12 PM by dipstick.

68MGBken Ken A
North Branford, CT, USA   USA
thanks for the help everyone

Be Coming Avatar
Be Coming Kelvin Dodd
So. Calif., USA   USA
The UK manufactured intake/exhaust gaskets leave a lot to be desired. When Moss Motors was working on supercharging the MGB, we went out and had a high quality gasket manufactured here in the States.

http://www.mossmotors.com/graphics/products/PDF/297-535.pdf


Kelvin.

. Hide banner ads & support this website by becoming a > Supporting Member <

To add your reply, or post your own questions

Members Sign In   or   Create an Account

Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster