Can RTV or other all purpose gasket silicone be used on the air crossover on top of the intake manifold.This is on a non intercooled engine where crossover, air heater,& intake meet. It doesn't get that hot but there is alot of air flow.Also any tips on holding the exhaust gaskets in place on a ported exhaust manifold,they need to be held in place till torqued or they might shuffle & block some of the air flow.
THANKS...RM

90 2WD non inter.. 3to4 straight pipe..modified air intake with K&N..pump tweaked,exhaust&turbo ported,polished.Stock 3sp-727.

 

I don't see any reason why you couldn't use RTV. Just don't go nuts with it, but you knew that already. Permatex sells gasket adhesive in a spray can that I've used sucessfully to keep gaskets on parts while assembling.

 

I agree with wannadiesel, the only problem with RTV is when its used to extreme. Personally, anything that might have exposure to any internal engine parts would make me stay away from RTV, use the gaskets as they were intended. I've seen and experienced loose RTV plugging oil run channels and making lunch meat of the engine.

Just my nickel.

 

Can't use high-tack (tm) on exhaust parts. It will burn and cause leaks. It is great stuff for other things though!

 

Permatex makes a special sealant for CAT and Detroit that looks like jelly but when it sets up it is not as hard as RTV. We have had great luck with this on oil pans, intakes, etc. Detroits is red in color and CAT's is blue in color. You should be able to pick it up at either CAT or Detroit.

For holding exhaust gaskets, smear some Permatex anti seaze on each gasket after you have cleaned the exhaust port surface.

 

Thanks for the input.My main concern is not to let the exhaust gaskets move around too much during install & block the porting I've done on the manifold
RM
90 2WD non inter.. 3to4 straight pipe..modified air intake with K&N..pump tweaked,exhaust&turbo ported,polished.Stock 3sp-727.

 

The new exhaust gaskets will have little tabs sticking in to the bolt to hold it while you put it together.
The only thing I would be worried about using RTV on the intake is if it is not completely clean and smooth, it may push out under high boost. I would spend the $5 for a new gasket and rest easy.


Dave

 

Just to be clear,I will be using new gaskets. I used RTV as a generic term for a sealant only to hold temporarily the new gaskets in place for assembly.
The amount used would be verrrry small. All the gasket surfaces, turbo to manifold & manifold to head, have been taken down to fresh shiny metal.The reason for being so particular is that I just spent alot of time grinding & polishing
the manifold & turbo.The gaskets have enough play to move slightly during install,
even while torquing. I want the best gasket/manifold match as possible.
RM
90 2WD non inter.. 3to4 straight pipe..modified air intake with K&N..pump tweaked,exhaust&turbo ported,polished.Stock 3sp-727.

 

In my experiance any silicone base product can be a bear when aligning gaskets, if used liberally it will allow the gasket to sqeeze out and slide, use a little, let it dry some then go to town on it. I used it on my suburban headers with the aspestos gasket and found it was the only was to keep them from powerizing and leaking. I use it for valve covers without the gasket on my gasser and it works great.
apache.

 

Look at your front timing case cover, no gasket, just RTV.

 

On 24v engines this is the case, but all 12v have a gasket.

 

Ant time you use RTV, be sure and have some contact cleaner to clean both surfaces that will see it, RTV hates oil, and will leak after a little while, if you don't have any contact cleaner, you can use your wifes fingernail polish remover . Straight RTV on oil pans and valve cover gaskets, if the parts are de-greased good, seal it up and are a BOOGER to get loose.

 

I have always used alcohol and never had a problem sealing.

 

Yeah, but too much alcohol makes you leaky.

 

uh oh caught...