Question: intake manifold keeps coming loose

MarkRHayes · 09-25-2009

72 GT with 2.2 liter engine from OGTS. i notice that the exhaust/intake manifolds share the same gasket. i've replaced that. what i noticed was that the exhaust manifold actually has holes drilled into the ends so that it won't slip off the bolts. i've also noticed that the intake manifold does not, and it basically just holds on by sheer torque on the bolts that it shares with the exhaust manifold. i think the bolts keep working themselves loose and my intake is slipping, creating a vaccuum leak. is this setup normal and what can i do to remedy it. i've also noticed that on the intake manifold, there are holes at the top that a bolt can go into to attach it to the engine block but there are no holes in the engine block.

blancojp · 09-25-2009

Originally Posted by MarkRHayes

72 GT with 2.2 liter engine from OGTS. i notice that the exhaust/intake manifolds share the same gasket. i've replaced that. what i noticed was that the exhaust manifold actually has holes drilled into the ends so that it won't slip off the bolts. i've also noticed that the intake manifold does not, and it basically just holds on by sheer torque on the bolts that it shares with the exhaust manifold. i think the bolts keep working themselves loose and my intake is slipping, creating a vaccuum leak. is this setup normal and what can i do to remedy it. i've also noticed that on the intake manifold, there are holes at the top that a bolt can go into to attach it to the engine block but there are no holes in the engine block.

The center bolts have thick washers, or at least they do on mine, to create a sealing area pushing the manifold towards the block. The intake manifold also has two holes on top and the block should have two short studs that hold the manifold in place. Even without the short studs, the amount of available down travel is very small.

guyopel · 09-25-2009

The intake manifold bolts are easy to strip and then they do not tighten . If your bolts are O.K. then you could add grounding star washers ( Radio Shack for 3/8 washers ) to help hold the manifold .
Your cyl. head does not use the locating studs ( 2.2 ) because your intake is modified to fit the 2.2 if I am correct it was machined to fit your Eng. HTH

John

opelwasp · 09-25-2009

Two words, Loctite Red

kwilford · 09-25-2009

Um, obvious question: is the flange on the intake manifold the same thickness as the exhaust manifold, at least at the points that the bolt washers contact? It sounds like your intake flange is thinner.

opeletti75 · 09-26-2009

maybe loctite not sure

09-25-2009	#1 (permalink)
MarkRHayes Army Opeler Join Date: Mar 2005 Location: Jonesboro, GA Posts: 89	Unanswered: intake manifold keeps coming loose 72 GT with 2.2 liter engine from OGTS. i notice that the exhaust/intake manifolds share the same gasket. i've replaced that. what i noticed was that the exhaust manifold actually has holes drilled into the ends so that it won't slip off the bolts. i've also noticed that the intake manifold does not, and it basically just holds on by sheer torque on the bolts that it shares with the exhaust manifold. i think the bolts keep working themselves loose and my intake is slipping, creating a vaccuum leak. is this setup normal and what can i do to remedy it. i've also noticed that on the intake manifold, there are holes at the top that a bolt can go into to attach it to the engine block but there are no holes in the engine block.

09-25-2009	#3 (permalink)
guyopel Member Join Date: Feb 2003 Location: Duluth,Ga. Posts: 649 Real Name: John Provided Answers: 2	The intake manifold bolts are easy to strip and then they do not tighten . If your bolts are O.K. then you could add grounding star washers ( Radio Shack for 3/8 washers ) to help hold the manifold . Your cyl. head does not use the locating studs ( 2.2 ) because your intake is modified to fit the 2.2 if I am correct it was machined to fit your Eng. HTH John __________________ Guyopel I have not failed - I've merely found 10,000 ways that won't work." ---Thomas Edison It's amazing what God lets man get away with when lightning is so cheap. Mark Twain
	1 out of 1 members found this post helpful.

09-25-2009	#4 (permalink)
opelwasp Non Civilian Join Date: Mar 2003 Location: Between Chico and Sac, CA Posts: 1,596 Provided Answers: 1	Two words, Loctite Red __________________ Arguing online is the same as racing in the Special Olympics; no matter who wins, you're both still retarded.

09-25-2009	#5 (permalink)
kwilford Über OpelGT.com Moderator Join Date: Mar 2002 Location: Calgary, Alberta, Canada Posts: 4,087 Real Name: Keith Wilford Provided Answers: 4	Um, obvious question: is the flange on the intake manifold the same thickness as the exhaust manifold, at least at the points that the bolt washers contact? It sounds like your intake flange is thinner. __________________ Keith Wilford working on my '71 GT and '75 SportWagon Last edited by kwilford; 09-27-2009 at 02:58 AM.

09-26-2009	#6 (permalink)
opeletti75 opeletti75 Join Date: Oct 2006 Location: rockvile ct Posts: 422 Real Name: mike poletti	opeletti maybe loctite not sure

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