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Old 04-27-2012, 03:35 PM
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SBC intake manifold will not stop leaking?

I have a 96 Express van and I completely rebuild the engine. I originally had the intake sealed up tight but the lifters were defective so I had to pull it apart and reseal it. Then it leaked. I re sealed the intake again and now it leaks in the same area. leaks at the rear of the manifold where I applied RTV. I just got it together again and now it seeps from there. Any ideas on what is going on? it has the vortec style factory intake on it.
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Old 04-27-2012, 03:39 PM
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Quote:
Originally Posted by chucksrt
I have a 96 Express van and I completely rebuild the engine. I originally had the intake sealed up tight but the lifters were defective so I had to pull it apart and reseal it. Then it leaked. I re sealed the intake again and now it leaks in the same area. leaks at the rear of the manifold where I applied RTV. I just got it together again and now it seeps from there. Any ideas on what is going on? it has the vortec style factory intake on it.
If you had it sealed up once before you had to tear it back down again, then you must be rushing yourself this time around getting aggravated and not getting it to seal up properly. JMO Relax clean it good and give it time to set-up before firing it up or so on. JMO



Cole
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Old 04-27-2012, 03:43 PM
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Very important to clean the mating surfaces with brake cleaner. Any oil and the silicone won't adhere.
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Old 04-27-2012, 04:08 PM
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I wasn't rushing. Whe I re did it the first time I did it myself (sitting in the van and trying to lift it into place and manuvering around components). I may have pushed the rtv out of place then. This time I did it with a friend and I triple checked and cleaned every surface! I was not in a hurry!! Believe me, I just want to get it running and it is just a toy, so no need to blast through repairs. I just don't understand? is applying a bead of rtv to the block and smearing rtv on the manifold ok to do? I think this will be my next method unless instructed otherwise.
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Old 04-27-2012, 04:34 PM
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If you have GOOD access to the offending area ,SOMETIMES you can clean the area and apply some more silicone [press it in ,your trying to fill a void] & it'll work !! CLEAN _CLEAN_CLEAN !!!
dave
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Old 04-27-2012, 04:41 PM
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I have always had good luck by dimpleing the intake and block surface with a center punch. I know its too late now, but if you pull the intake again, clean it good and dimple front and rear!!
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Old 04-27-2012, 05:04 PM
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Quote:
Originally Posted by chucksrt
I have a 96 Express van and I completely rebuild the engine. I originally had the intake sealed up tight but the lifters were defective so I had to pull it apart and reseal it. Then it leaked. I re sealed the intake again and now it leaks in the same area. leaks at the rear of the manifold where I applied RTV. I just got it together again and now it seeps from there. Any ideas on what is going on? it has the vortec style factory intake on it.
Are you using RTV as a gasket replacement on the china wall or is this just trying to get a seal with gaskets where they meet at the corners of the china wall, head, and intake?

By reseal do you mean the manifold came off each time and the sealing process repeated or at some point is the engine left assembled and you're putting RTV on the external joints?

Are you using RTV meant for engines rather than household plumbing?

Bogie
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Old 04-27-2012, 05:17 PM
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Quote:
Originally Posted by oldbogie
Are you using RTV as a gasket replacement on the china wall or is this just trying to get a seal with gaskets where they meet at the corners of the china wall, head, and intake?

By reseal do you mean the manifold came off each time and the sealing process repeated or at some point is the engine left assembled and you're putting RTV on the external joints?

Are you using RTV meant for engines rather than household plumbing?

Bogie
They don't sell the gasket kits with rubber seals for the china wall that I have seen. I am using rtv instead of a seal on the front and rear of the manifold. Yes I did pull the manifold off each time and replace the gaskets and rtv. Yes the rtv is for engines.
I think I will try to clean the crap out of the area and apply a thin coat of rtv to the outside of the existing rtv.
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Old 04-27-2012, 05:19 PM
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Quote:
Originally Posted by 2old2fast
If you have GOOD access to the offending area ,SOMETIMES you can clean the area and apply some more silicone [press it in ,your trying to fill a void] & it'll work !! CLEAN _CLEAN_CLEAN !!!
dave
Would it be best to trim away the excess rtv that is there and then apply more rtv to it?
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Old 04-27-2012, 06:49 PM
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I'd only trim off what has squished out , then clean it w/ alcohol and put it on like you're grouting tile , you can always clean off any extra...
dave
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Old 04-27-2012, 06:54 PM
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I think I would pull it back off and do it right
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Old 04-27-2012, 08:13 PM
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Remove the intake..(Sorry) clean the china walls with brake clean and the bottom of the intake also, and then use Permatex" Right stuff " it comes in a cheese wiz can, make a good thick bead and immediately install the intake right stuff is far superior to regular junky RTV. Always use Right stiff on a engine, Oil will attack regular rtv and it will eventually leak.
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Old 04-27-2012, 08:30 PM
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Quote:
Originally Posted by Jim Rockford
Remove the intake..(Sorry) clean the china walls with brake clean and the bottom of the intake also, and then use Permatex" Right stuff " it comes in a cheese wiz can, make a good thick bead and immediately install the intake right stuff is far superior to regular junky RTV. Always use Right stiff on a engine, Oil will attack regular rtv and it will eventually leak.
+1 for the right stuff
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Old 04-28-2012, 06:43 AM
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suck it in.

My old neighbor used to build a lot of circle track cars. He would duct tape all the openings on the engine, hook up a vacuum source to the dip stick tube then get out his stethescope and check aroung for a whistle. He would dab on sealant until he got the leak stopped, the vacuum sucked in into the hole. too much vacuum would suck it all the way through.
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Old 04-28-2012, 08:20 AM
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Quote:
Originally Posted by Jim Rockford
Remove the intake..(Sorry) clean the china walls with brake clean and the bottom of the intake also, and then use Permatex" Right stuff " it comes in a cheese wiz can, make a good thick bead and immediately install the intake right stuff is far superior to regular junky RTV. Always use Right stiff on a engine, Oil will attack regular rtv and it will eventually leak.
X2



Cole
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