Sealing intake manifold
11-16-11, 02:52 PM
#1
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Sealing intake manifold
I know that I have a vacuum leak around the intake manifold and plan to replace the gasket. Other than replacing the gasket and properly torquing the bolts, does anyone have a sure fire way to guarantee that manifold will not leak. I only want to do this once.
11-16-11, 03:28 PM
#2
Which gasket are you doing? Lower intake-to-engine, or one of the ones between pieces of the intake manifold? You should do them all while you're taking stuff apart in the area.
11-16-11, 04:01 PM
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(since it looks like you hv an s4 in your avatar) you may want to replace the gaskets for the 5/6 pt. actuators also. (s5 is diff and doesnt use gaskets there)
11-16-11, 04:13 PM
#5
I've heard that applying a thin coat of grease to the paper(?) gaskets allows them to be removed in one piece and reuesed. I haven't tried it myself, but I plan on doing so next opportunity I have.
http://grassrootsmotorsports.com/art...ease-its-word/
http://grassrootsmotorsports.com/art...ease-its-word/
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11-16-11, 05:18 PM
#9
So you don't have to buy another one 
.
The actuators are very easy to remove, you can do it without even removing anything else, it's just 2 10mm nuts each and they slide off the actuator arm. I've never heard of an actuator leak in particular, but if other intake gaskets are leaking, the actuators probably are too.
.The actuators are very easy to remove, you can do it without even removing anything else, it's just 2 10mm nuts each and they slide off the actuator arm. I've never heard of an actuator leak in particular, but if other intake gaskets are leaking, the actuators probably are too.
11-17-11, 10:05 PM
#11
zoom zoom go boom
Mating surfaces must absolutely be completely clean of any and all old gasket. Dont even utter the words "good enough". Do that and you shouldnt even have to use RTV.
I do agree that while your at it you should replace all intake gaskets. Hell, I used to go as far as using that time to replace vacuum hoses which are easily accessible at that time.
I do agree that while your at it you should replace all intake gaskets. Hell, I used to go as far as using that time to replace vacuum hoses which are easily accessible at that time.
11-18-11, 12:49 PM
#12
I generally don't like putting rtv or silicone on intake gaskets. Oil or coolant is ok, but I don't like the idea of a silicone booger falling off and getting in the engine. Even if it's just rubbery silicone, there's a reason cars use air filters. In all reality, it'll probably just pass right through and go out the exhaust, but why take the chance when a clean mating surface and proper gasket will seal it like it came from the factory?
11-28-11, 05:54 PM
#14
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Stay away from rvt its a pain and looks like crap and always the chance of boogering in your motor, so clean all your surfaces and coat your gasket lightly with copper gasket spray like PERMATEX Copper SPRAY-A-GASKET Hi Temp Adhesive Sealant (if you soak it, it will mess up your gasket) and tape off and lightly coat your surfaces of the manifold too so if you ever need to take your manifold back off all you will need to clean off is the copper and some laquer thinners takes that right off.
11-28-11, 06:00 PM
#15
have fun chiseling off the asbestos!
usually if the OE gaskets haven't been compromised i leave them alone. sometimes it can take upwards of an hour or more cleaning up one mating surface. if worried a quick coat of ultra copper(spray) will seal any minor imperfections in the surface.
original mazda gaskets suck to remove, but they did their job well. usually the LIM to the block and the 5/6th ports are the only ones that fail.
usually if the OE gaskets haven't been compromised i leave them alone. sometimes it can take upwards of an hour or more cleaning up one mating surface. if worried a quick coat of ultra copper(spray) will seal any minor imperfections in the surface.
original mazda gaskets suck to remove, but they did their job well. usually the LIM to the block and the 5/6th ports are the only ones that fail.
Last edited by RotaryEvolution; 11-28-11 at 06:04 PM.
11-30-11, 06:20 PM
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