Should i use gasket sealer on exhaust manifold

Apr 11, 4. I didn't use any sealant on mine and I never had a problem. Apr 11, 5. I've been thinking about it and I'm pretty sure I used perfect seal on manifold to riser and riser to elbow joints. Nothing, of course, on the head to manifold joint. I remember also using perfect seal on the raw water hoses and drains to eliminate that occasional drip. Apr 11, 6. My marine mechanic uses OSCO "green" gaskets dry.

He said the OSCO gaskets have something in the gaskets that provides a great seal. The key is to make sure the mating surfaces of the exhaust parts are not damaged. Clean them well and polish with emory paper, not sand paper!

The MERC gaskets can leak dry. I put on the green OSCO gaskets specified for my engine when I replaced the exhaust manifolds, 3" extensions, and exhaust elbows last spring. No leaks! Good luck! Apr 11, 7. I have used Sierra gaskets. They are "green" also, and seem much heavier than the Mercruiser gaskets. I use a spray from NAPA on gaskets. It is red and tacky. I use it for all gaskets, marine and automotive.

Apr 12, 8. Either or will stay flexible to create a good seal. The last thing you want to do is have a small leak and have water in your cylinders. Apr 12, 9. If the exhaust manifold is warped. I do not think it will hurt to put copper sealer on because it may increase heat transfer. Studebaker used metal gaskets and there always was a good reason for Studebaker to do things even though they sometimes made no sense.

Bob Kapteyn. Comment Post Cancel. I never use the steel intake gaskets. I always use the good composite intake gaskets. Never have had a failure of any type on an intake. On the exhaust side, I could see the steel gaskets, if you only use new ones. I'd spray them on both sides with the Copper Coat before installing. Just an opinion, of course Mike Van Veghten. Met - I've used both methods with zero problems on cars actually driven, other than to and from shows.

And yes, the Copper Coat type sealer is a good sealer and what I use for metal composit or shim type gaskets. On the nonmetalic intake gaskets, I put them on dry. Maybe if it's older material I'll get them wet in warm water, then install the manifold. Tighten the fasteners again before driving off. If you have an aluminum intake manifold Cast iron ALL of the automotive manufacturers have used both types for years with Revington can supply thicker manifold gaskets for this sort of job.

Ian Cornish Edited November 21, by ianc. Posted December 2, Posted December 4, Nick Jones Posted December 4, Wideband O2 sensors suffer from silicone poisoning too Hi Nick I think the ambition given not perfect alignment of faces and tendency even when clamped for movement to occur and then the odd blow to develop is to find a magical compound that will flex with the movement and not set rock solid at high exhaust temps.

RobTR3 Posted December 5, Posted December 5, Dave As well as using RevingtonTR improved manifold gasket, I think they also recommend 'Heldite' sealing compound when fitting the gasket. Dave Herrod Posted December 6, Posted December 6, Thanks all for the replies. Interesting thought about ensuring greater flexibility elsewhere. Alec Pringle Posted December 6, The choice of flexi pipe is endless. Waldi Posted December 6, Posted December 6, edited. Hi Alec, Good thought.

The standard exhaust in mild steel does not have an expansion joint. I can imagine converting the exhaust to SS contributes to the issues of leaking gaskets. Regards, Waldi Edited December 6, by Waldi. BrianC Posted December 7, Posted December 7, MichaelH Posted December 8, Posted December 8, Hi J'all Use high temp silicone - orange stuff: use it on my race engine The head and the manifold - especially the thick bit to which the tubes are attached never get that hot because of the heat sink effect of the head Just get the manifold as flat as possible coat both sides with high temp silicone and let it go off for 15 mins then bolt it up If you want pressure resistance then use Wurth motor sealant but it is not generally necessary Michael Hunter.

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