C5 intake installation
Thread Starter
Intermediate
Joined: Sep 2009
Posts: 29
Likes: 0
C5 intake installation
The factory manual says to put a thread sealant on the bolts and torque to 89 lb-inches. Is this torque that critical and does this equal
7.4lb-ft?
In addition is it OK not to replace the 8 seals, since I don't intend on removing the intake from the engine, just move it forward as some have recommended in replacing the sensor.
Ciao
7.4lb-ft?
In addition is it OK not to replace the 8 seals, since I don't intend on removing the intake from the engine, just move it forward as some have recommended in replacing the sensor.
Ciao
Drifting
Joined: May 2010
Posts: 1,482
Likes: 2
From: Pearland, TX
Torque isn't critical, but make sure you know what 89 inch*lbs feels like before you try to tighten them without a wrench. And yeah it's 7.4 ft*lbs.
How many miles are on your car? It may not be a bad idea to at least look at the gaskets to see if any need to be replaced. Or maybe just feel with your fingers and see if they're still pliable.
How many miles are on your car? It may not be a bad idea to at least look at the gaskets to see if any need to be replaced. Or maybe just feel with your fingers and see if they're still pliable.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Pull the intake completely and flip it over. You will likely find sand in the seals. Clean and inspect them thoroughly. Replace them if they are too deformed. Also, clean the bolts and the area around the bolt holes in the head as these holes are directly over the lifters and you don't want any dirt falling in.
Following the service manual for installation as the tightening is done in two steps and in a specific sequence. Don't forget these are very long 6mm bolts and not using a torque wrench runs the risk not only twisting the plastic intake but also breaking a bolt off in the head, which won't be fun if it happens.
Following the service manual for installation as the tightening is done in two steps and in a specific sequence. Don't forget these are very long 6mm bolts and not using a torque wrench runs the risk not only twisting the plastic intake but also breaking a bolt off in the head, which won't be fun if it happens.
Last edited by vettenuts; Jan 18, 2012 at 05:26 AM.
Melting Slicks
Joined: Jan 2007
Posts: 2,170
Likes: 6
From: Oilerville Edmonton
St. Jude Donor '08
I have my car apart for this very project. you are going to want to remove the intake and clean underneath for sure. in regards to the gaskets, my car has 60k miles on it and the gaskets are not in great shape. for the $50 or whatever, it is better to replace them rather than risk having to redo the entire proceedure due to a gasket leak.
here is a thread with pics of what my engine looked like under the manifold:
http://forums.corvetteforum.com/c5-t...-manifold.html
here is a thread with pics of what my engine looked like under the manifold:
http://forums.corvetteforum.com/c5-t...-manifold.html
Drifting
Joined: Apr 2011
Posts: 1,454
Likes: 6
From: Pittsburgh PA
Good move. If you do much of your own work, you won't regret investing in an inch pound/newton meter wrench.
Don't forget to put the two rear bolts in the manifold before slipping it in place. You can hold them up with some masking tape so they don't catch. You can't get them in once the intake is in position under the cowl. Don't ask how I know.
And I don't know how I double posted either.....sorry
Don't forget to put the two rear bolts in the manifold before slipping it in place. You can hold them up with some masking tape so they don't catch. You can't get them in once the intake is in position under the cowl. Don't ask how I know.
And I don't know how I double posted either.....sorry
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Drifting
Joined: May 2010
Posts: 1,482
Likes: 2
From: Pearland, TX
Tech Contributor
Joined: Jan 2007
Posts: 19,353
Likes: 1,125
From: Dyer, IN
The factory manual says to put a thread sealant on the bolts and torque to 89 lb-inches. Is this torque that critical and does this equal
7.4lb-ft?
In addition is it OK not to replace the 8 seals, since I don't intend on removing the intake from the engine, just move it forward as some have recommended in replacing the sensor.
Ciao
7.4lb-ft?
In addition is it OK not to replace the 8 seals, since I don't intend on removing the intake from the engine, just move it forward as some have recommended in replacing the sensor.
Ciao
Tech Contributor
Joined: Jan 2007
Posts: 19,353
Likes: 1,125
From: Dyer, IN
Wrong. The service manual specifically calls for thread locker on the intake manifold bolts.
"Apply threadlock GM P/N 12345382 or equivalent to the threads of the intake manifold bolts...."
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
The Service Manual does call out Locktite ... which should also provide some thread sealing along with ensuring the intake bolts don't move since they are pretty low torque fasteners.
Last edited by ZeeOSix; Jan 18, 2012 at 10:16 PM.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
To jpulone - you definitely want to remove the intake so you can clean up everything underneath. If you just move it, you risk the chance of something getting down inside the intake ports or on the sealing gaskets which will create some problems.
BTW - you can get a whole set of new intake gaskets, Fel-Pro brand from the local parts stores for $25. Just replace them if you go through the trouble of doing the job. Last thing you want to do is the job twice!
While you're in there, might as well seal up the knock sensor covers to keep any water from getting down the knock sensor wells.
BTW - you can get a whole set of new intake gaskets, Fel-Pro brand from the local parts stores for $25. Just replace them if you go through the trouble of doing the job. Last thing you want to do is the job twice!
While you're in there, might as well seal up the knock sensor covers to keep any water from getting down the knock sensor wells.
Drifting
Joined: May 2010
Posts: 1,482
Likes: 2
From: Pearland, TX
Yes, that was WRONG. WRONG WRONG WRONG WRONG WRONG WRONG. I was teh confused and I apologize for ruining your heads.
Instructor
Joined: Sep 2006
Posts: 159
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From: Rantoul IL
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
I decided to check my FSM for 2001, it also says threadlock GM P/N 12345382 for these bolts. First time I have noticed that. Now I am wondering if Locktite Blue is equivalent. I did not see Locktite Blue as an interchange in the info from Lucky...
Drifting
Joined: May 2010
Posts: 1,482
Likes: 2
From: Pearland, TX
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
Blue Locktite should be fine for the intake bolts. It's actually shown as equivalent to the GM call out on page 2 of the Locktite spec sheets ("OEM Interchange" table) that Lucky posted - highlighted in yellow.
Last edited by ZeeOSix; Jan 19, 2012 at 02:33 AM.