Leaking Intake Manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 04-17-2005, 01:48 AM

I noticed this under my intake. Does this mean its leaking? I felt around under it and it didnt have any oil that I could feel.

lngbed71 · 04-17-2005, 02:44 AM

Yup, looks like a front manifold leak. That will happen when the your engine is at speed because of existing oil pressure and oil being slung around under the manifold. Did you use the runner gasket, or plain RTV there?

skokie · 04-17-2005, 04:42 PM

I used the ultra black rtv. I layed down a bead about as thick as a straw and let it sit for about 30 mins before I put the intake on. That may explain why I thought I had a rear seal leak. Its coming down the front and blowing down along the oil pan and getting to the tranny dust cover. Well I hope I am right. Also has anyone done this. Layed down a thin bead of rtv put on the rubber gasket and then layed down mpre rtv and put the intake on?

Thanks

Dean23 · 04-17-2005, 04:54 PM

dont use rtv and agasket it wont seal. when you use rtv both surfaces must be spotless. clean off old rtv till you get to nice clean bare metal then use some brake clean on a rag and wiper both mounting surfaces clean. tehn splly the rtv and set the intake on and torque it down. another bonus is dont start it for 24-48 hours this gives the rtv a good chance to cure

Fred T · 04-17-2005, 06:37 PM

Adding to what Dean said, inspect the sealant while it is still wet, looking for gaps. Properly applied, it should squeeze out in a uniform bead. After it's cured, you can trim the excess with a razor blade.

04-17-2005, 01:48 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Leaking Intake Manifold I noticed this under my intake. Does this mean its leaking? I felt around under it and it didnt have any oil that I could feel. Attached Images __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

04-17-2005, 02:44 AM	#2
lngbed71 Nothing fits but the oil Join Date: Mar 2003 Location: Gaston, Indiana Posts: 424	Yup, looks like a front manifold leak. That will happen when the your engine is at speed because of existing oil pressure and oil being slung around under the manifold. Did you use the runner gasket, or plain RTV there? __________________ Land of the free Because of the brave

04-17-2005, 04:42 PM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	I used the ultra black rtv. I layed down a bead about as thick as a straw and let it sit for about 30 mins before I put the intake on. That may explain why I thought I had a rear seal leak. Its coming down the front and blowing down along the oil pan and getting to the tranny dust cover. Well I hope I am right. Also has anyone done this. Layed down a thin bead of rtv put on the rubber gasket and then layed down mpre rtv and put the intake on? Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

04-17-2005, 04:54 PM	#4
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	dont use rtv and agasket it wont seal. when you use rtv both surfaces must be spotless. clean off old rtv till you get to nice clean bare metal then use some brake clean on a rag and wiper both mounting surfaces clean. tehn splly the rtv and set the intake on and torque it down. another bonus is dont start it for 24-48 hours this gives the rtv a good chance to cure __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

04-17-2005, 06:37 PM	#5
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Adding to what Dean said, inspect the sealant while it is still wet, looking for gaps. Properly applied, it should squeeze out in a uniform bead. After it's cured, you can trim the excess with a razor blade. __________________ Fred There is no such thing as too much cam...just not enough engine.



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