Intake manifold vacuum leaks
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=17128
Printed Date: November-18-2024 at 8:46am
Topic: Intake manifold vacuum leaks
Posted By: Riley
Subject: Intake manifold vacuum leaks
Date Posted: April-14-2010 at 11:21am
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Anyone ever run into vacuum leaks through the bolts of an intake manifold? I'm guessing it's not an unusual problem and that some kind of coating for the bolts should be used to seal them up? Any suggestions on what to use?
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Replies:
Posted By: 79nautique
Date Posted: April-14-2010 at 12:37pm
waiste of time adding sealent to the bolts. The only way that it can leak out of that area is if the gasket is shot and it'll be leaking in a lot of other places besides around the bolts. It's very uncommon for the intake to leak around the bolts hols. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Riley wrote:Posted By: 8122pbrainard
Date Posted: April-14-2010 at 1:35pm
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Bruce,
Try some of the blue RTV durring assembly. Were there any copper sealing washers under the heads of any of the original bolts?
Chris, I believe this issue is on Bruce's Y block. I think the situation is different than later blocks. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Riley
Date Posted: April-14-2010 at 1:49pm
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It is on the Y block. When we got it running last year we had vacuum leaks everywhere, including some from the bolts. We tightened up on all the bolts and got rid of most of the leaks. The engine ran good at that point and we wnated to get it broken in so we quit messing with it and put about 15 hours on it. It ran very good.
We're going to start work on it when David comes home in May and are pulling the intake off to cover up the exhaust crossover and then install a marine carb. I'm not sure about the washers, I'll check for those when we pull it off. What is RTV? ------------- |
Posted By: 79nautique
Date Posted: April-14-2010 at 1:59pm
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do the bolts go through an intake runner? if not then how can it leak? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: Riley
Date Posted: April-14-2010 at 2:09pm
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I'm looking at a pair of gaskets and there appears to be bolt holes in them on each side of the runners. The runners would be the holes that fuel/air leave the manifold and go into the head? ------------- |
Posted By: BuffaloBFN
Date Posted: April-14-2010 at 2:24pm
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A long time engine builder pointed me to permatex white for bolts that go into a water passage. ------------- http://correctcraftfan.com/diaries/details.asp?ID=2331&sort=&pagenum=12&yrstart=1986&yrend=1990" rel="nofollow - 1988 BFN-sold "It's a Livin' Thing...What a Terrible Thing to Lose" ELO |
Posted By: Riley
Date Posted: April-14-2010 at 2:31pm
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Greg, I haven't forgot I still owe you a phone call about that carb. I'm not sure yet if we need a 450 or 600, and am undecided if we are going Holley or Edelbrock. ------------- |
Posted By: BuffaloBFN
Date Posted: April-14-2010 at 2:52pm
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No worries, it's still here.
I looked at that permatex tube...it's called high temp thread sealer. ------------- http://correctcraftfan.com/diaries/details.asp?ID=2331&sort=&pagenum=12&yrstart=1986&yrend=1990" rel="nofollow - 1988 BFN-sold "It's a Livin' Thing...What a Terrible Thing to Lose" ELO |