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Finally started on my repairs and I have some questions.
On the back of the LT4 intake is an exhaust tube.
1. What type of sealant should be used to attach this back to the intake?
2. Is there an easier way to move this pipe out of the way to put the intake back in. I tried to loosed the 7/8" pipe nut on the exhaust manifold with no luck. Not enough room to get movement on the wrench.
On another area but same subject, does anyone know what color RTV the factory used to seal the front and back of the intake. Mine was cream/tan in color. The manifold was leaking in the front and back. Almost all of the bolts, save the four center, were hand tight at best.
Oh, and for record, the engineer that designed the upper radiator shroud (sp?) needs to be drawn, quartered and set on fire.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Here are pics of my previously-owned LT4 with fuel cover rails removed. What pipe are you talking about? Also, the FSM shows diagrams of the shroud with instructions on how to remove it.
Here are pics of my previously-owned LT4 with fuel cover rails removed. What pipe are you talking about? Also, the FSM shows diagrams of the shroud with instructions on how to remove it.
The lower left corner. Silver pipe with two bolts connecting to the intake. This is the passenger side rear of the intake. The pipe is connected to the passenger side exhaust header.
The lower left corner. Silver pipe with two bolts connecting to the intake. This is the passenger side rear of the intake. The pipe is connected to the passenger side exhaust header.
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
Originally Posted by MotorCity_87_C4
Probably EGR.
LT4s don't have EGRs
To the OP, that is the A.I.R. pipe that connects to both exhausts manifolds. If you dont have the gasket, use RTV to seal it. Ensure it is sealed, or you will have vacuum ergo a lean condition/check engine light.
To move it out of the way loosen everything like you did but there is also a bracket that goes down and attaches to the back of the passenger side head. Believe it is a 9/16 wrench size. Loosen that bracket as well and you should have plenty of play.
Originally Posted by kg4fku
Finally started on my repairs and I have some questions.
On the back of the LT4 intake is an exhaust tube.
1. What type of sealant should be used to attach this back to the intake?
2. Is there an easier way to move this pipe out of the way to put the intake back in. I tried to loosed the 7/8" pipe nut on the exhaust manifold with no luck. Not enough room to get movement on the wrench.
On another area but same subject, does anyone know what color RTV the factory used to seal the front and back of the intake. Mine was cream/tan in color. The manifold was leaking in the front and back. Almost all of the bolts, save the four center, were hand tight at best.
Oh, and for record, the engineer that designed the upper radiator shroud (sp?) needs to be drawn, quartered and set on fire.
Finally started on my repairs and I have some questions.
On the back of the LT4 intake is an exhaust tube.
1. What type of sealant should be used to attach this back to the intake?
2. Is there an easier way to move this pipe out of the way to put the intake back in. I tried to loosed the 7/8" pipe nut on the exhaust manifold with no luck. Not enough room to get movement on the wrench.
On another area but same subject, does anyone know what color RTV the factory used to seal the front and back of the intake. Mine was cream/tan in color. The manifold was leaking in the front and back. Almost all of the bolts, save the four center, were hand tight at best.
Oh, and for record, the engineer that designed the upper radiator shroud (sp?) needs to be drawn, quartered and set on fire.
At the 3:04 mark LT1 Intake Manifold Gasket Replacement *PART 2* LT1 Corvette C4 - YouTube[/url] you will see there is a gasket on the tube. I also explain it's not necessary to remove the tube entirely to remove the intake manifold. Good luck - Ozz
Ozzstar - Thanks for the reply. I am not planning on removing the tube just trying to get a little more vertical space to aid in landing the intake for reinstallation.
I did find the part number for the gasket. It is GM 219-556. Which is no longer available. NAPA shows a gasket for that application as CRB 22574.
I am going to try that and see if it the correct one.
I am also looking for part number 10105324. This is the short vacuum tube that goes to the throttle body from the Fuel Tank Evaporator Control assembly located on the passenger side of the intake (P/N 215-565). Neither of those part numbers are available anymore.
Interesting that these parts were used on the LT1/4 and the L99, of which no telling how many millions were made and still exist today. However, these parts are no longer available.
04-25-2015, 06:50 PM
intake questions
