Check Your Intake Manifold Bolts!!!
Thread Starter
Instructor
Joined: Jun 2003
Posts: 168
Likes: 0
From: Crystal Lake IL
Check Your Intake Manifold Bolts!!!
While doing a bit of work on the car, just for the hell of it I decided to check the manifold bolts. The car is stock and has never been touched in that area. I have an oil leak issue there. They were all loose. Everyone of them were only torqued to 10 lbs or less. The only one I couldn't really get to was the one under the throttle connection on the TB. Any advice on that one? Hopefully this will at least slow the leak. I would suggest that anyone whose car is stock and hasn't been touched to check also.
The work I was doing was replacing the coil and ICM. Hoping that will fix the stumble and hesitation on acceleration and cutting out in the upper rpms when hot. Will report back on that. Drove the car twice since and no problem yet. It seemed to pull a lot smoother. I'll see this afternoon when the temp is around 90. I've got my fingers crossed.
The work I was doing was replacing the coil and ICM. Hoping that will fix the stumble and hesitation on acceleration and cutting out in the upper rpms when hot. Will report back on that. Drove the car twice since and no problem yet. It seemed to pull a lot smoother. I'll see this afternoon when the temp is around 90. I've got my fingers crossed.
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
i had a nice pume of oil smoke fill my cabin the other day when redlining it......turned out a few valve cover bolts were loose.
it's good practice to check all these from time to time.....
it's good practice to check all these from time to time.....
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
While doing a bit of work on the car, just for the hell of it I decided to check the manifold bolts. The car is stock and has never been touched in that area. I have an oil leak issue there. They were all loose. Everyone of them were only torqued to 10 lbs or less. The only one I couldn't really get to was the one under the throttle connection on the TB. Any advice on that one? Hopefully this will at least slow the leak. I would suggest that anyone whose car is stock and hasn't been touched to check also.
The work I was doing was replacing the coil and ICM. Hoping that will fix the stumble and hesitation on acceleration and cutting out in the upper rpms when hot. Will report back on that. Drove the car twice since and no problem yet. It seemed to pull a lot smoother. I'll see this afternoon when the temp is around 90. I've got my fingers crossed.
The work I was doing was replacing the coil and ICM. Hoping that will fix the stumble and hesitation on acceleration and cutting out in the upper rpms when hot. Will report back on that. Drove the car twice since and no problem yet. It seemed to pull a lot smoother. I'll see this afternoon when the temp is around 90. I've got my fingers crossed.
Thread Starter
Instructor
Joined: Jun 2003
Posts: 168
Likes: 0
From: Crystal Lake IL
Drifting
Joined: Dec 2005
Posts: 1,313
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From: High Ridge Missouri
Melting Slicks
Joined: Oct 2004
Posts: 2,510
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From: Austin Texas
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Drifting
Joined: Feb 2003
Posts: 1,614
Likes: 163
From: Davis CA
Edelbrock says 11 ftlbs for its hi-flo base (like Accel's)
http://www.edelbrock.com/automotive_.../3000/3817.pdf
35 does seem like overkill for bolts of that size and for this function.
http://www.edelbrock.com/automotive_.../3000/3817.pdf
35 does seem like overkill for bolts of that size and for this function.
Race Director
Joined: Jan 2002
Posts: 12,261
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From: O'Fallon Missouri
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
I dug up this old archived post from "FD2BLK" when I had a '95 :The specs are below, it should be done in two passes and you need to do it the proper sequence. The crude drawing below is the sequence
-----12---11---4---1---5---6
Back--------------------------Front of intake/Motor
-----10----9---3---2---7---8
Intake Manifold Bolt/Stud FIRST PASS
6 Ft Lbs
Intake Manifold Bolt/Stud SECOND PASS
35
Drifting
Joined: Feb 2003
Posts: 1,614
Likes: 163
From: Davis CA
Holly stealthram also says 11 ft/lbs
http://www.holley.com/data/Products/.../199R10343.pdf
Interesting.
I would like to see someone with more expertise than I have to step in and explain why we might see differences of this magnitude and the consequences of following the different instructions might be.
http://www.holley.com/data/Products/.../199R10343.pdf
Interesting.
I would like to see someone with more expertise than I have to step in and explain why we might see differences of this magnitude and the consequences of following the different instructions might be.
Thread Starter
Instructor
Joined: Jun 2003
Posts: 168
Likes: 0
From: Crystal Lake IL
That's a good one. 
Instructor
Joined: Apr 2007
Posts: 136
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From: Fountain CO
Holly stealthram also says 11 ft/lbs
http://www.holley.com/data/Products/.../199R10343.pdf
Interesting.
I would like to see someone with more expertise than I have to step in and explain why we might see differences of this magnitude and the consequences of following the different instructions might be.
http://www.holley.com/data/Products/.../199R10343.pdf
Interesting.
I would like to see someone with more expertise than I have to step in and explain why we might see differences of this magnitude and the consequences of following the different instructions might be.
Drifting
Joined: Feb 2003
Posts: 1,614
Likes: 163
From: Davis CA
Nope. Too easy. The 86 FSM says 25-45 ft.lbs.
A problem I have with people "checking" is that the bolts should be Loctited and some will have thread sealer. What happens to these when the owner gives them a turn?
A problem I have with people "checking" is that the bolts should be Loctited and some will have thread sealer. What happens to these when the owner gives them a turn?
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
...BTW, what's up with the large variance of 25-45lbs for the '86 !! That's seems crazy to me....
Last edited by MikeC4; May 29, 2007 at 07:55 PM.
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
I can tell you right now 10 ft lbs. is very bad. I'm in the process of redoing my bolts as we speak. The first time I couldnt get one of the bolts to get more than 10 ft. lbs. on it cause it was stripped. Needless to say, I blew my intake gasket. The intake bolts are supposed to be between 20 and 25 ft. lbs.
Drifting
Joined: Feb 2003
Posts: 1,614
Likes: 163
From: Davis CA
My GM Factory Service Manual says to use Loctite 1052624 or equivalent. Can't determine exactly what current Loctite product is equivalent but my CF search suggested a thread locker. Holly says use 242 Blue.
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Or you can go el cheapo and just use black RTV and it works just as good.