USING SEALER ON INTAKE MANIFOLD?
02-08-2003, 10:19 AM
#12
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ok, here is the deal with the RTV on the intakes.
with almost all of GM V6 and V8 engines, if the intake gasket set includes end seals, throw them away !!!!!!!!!!!!!!!! they will defintly leak
use RTV on the corners and run a 1/4"-3/8" bead where the end seals should be.
also as a rule of thumb. i always put a thin film where the water ports are in the head and on the intake too.
and one more thing before i forget to tell you. get teflon sealant and make sure you put some on the threads of the intake bolts. this will prevent oil from coming through the threads of the bolts.
if you look at the newer GM engines, you will see that they use alot of RTV when they assemble them at the factory. i did head gaskets on a 3.1 this past week and the end seals on the intake were RTV . FACTORY!!!!
they use it for everything from oilpan gaskets to valve cover gaskets
hope this helped
with almost all of GM V6 and V8 engines, if the intake gasket set includes end seals, throw them away !!!!!!!!!!!!!!!! they will defintly leak
use RTV on the corners and run a 1/4"-3/8" bead where the end seals should be.
also as a rule of thumb. i always put a thin film where the water ports are in the head and on the intake too.
and one more thing before i forget to tell you. get teflon sealant and make sure you put some on the threads of the intake bolts. this will prevent oil from coming through the threads of the bolts.
if you look at the newer GM engines, you will see that they use alot of RTV when they assemble them at the factory. i did head gaskets on a 3.1 this past week and the end seals on the intake were RTV . FACTORY!!!!
they use it for everything from oilpan gaskets to valve cover gaskets
hope this helped
02-08-2003, 10:55 AM
#13
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Originally Posted by jeffrey10x2
ok, here is the deal with the RTV on the intakes.
with almost all of GM V6 and V8 engines, if the intake gasket set includes end seals, throw them away !!!!!!!!!!!!!!!! they will defintly leak
use RTV on the corners and run a 1/4"-3/8" bead where the end seals should be.
also as a rule of thumb. i always put a thin film where the water ports are in the head and on the intake too.
and one more thing before i forget to tell you. get teflon sealant and make sure you put some on the threads of the intake bolts. this will prevent oil from coming through the threads of the bolts.
if you look at the newer GM engines, you will see that they use alot of RTV when they assemble them at the factory. i did head gaskets on a 3.1 this past week and the end seals on the intake were RTV . FACTORY!!!!
they use it for everything from oilpan gaskets to valve cover gaskets
hope this helped
with almost all of GM V6 and V8 engines, if the intake gasket set includes end seals, throw them away !!!!!!!!!!!!!!!! they will defintly leak
use RTV on the corners and run a 1/4"-3/8" bead where the end seals should be.
also as a rule of thumb. i always put a thin film where the water ports are in the head and on the intake too.
and one more thing before i forget to tell you. get teflon sealant and make sure you put some on the threads of the intake bolts. this will prevent oil from coming through the threads of the bolts.
if you look at the newer GM engines, you will see that they use alot of RTV when they assemble them at the factory. i did head gaskets on a 3.1 this past week and the end seals on the intake were RTV . FACTORY!!!!
they use it for everything from oilpan gaskets to valve cover gaskets
hope this helped
02-08-2003, 12:56 PM
#14
Junior Member
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Jeffrey, I'm going to have to disagree with you 100% on this one. We have cars here with well over 100,000 miles and higher that are dry as a bone. Those end seals are the most critical. Because these seals are at the union of 4 pieces.....the block, both heads, and the lower intake, I wouldn't take the chance of NOT using the factory end seals. They work very well. I just did this to a 93 L27.
Using RTV on the mating surfaces of the upper intake where the water passages are is an even worse idea. A small layer of RTV in an area that doesn't actually touch, and with 2 dis-similar materials that expand and contracts at different rates is asking for failure. That RTV will delam and allow coolant to wick.
The factory seals on these engines are very well designed. The best I've seen yet. I'm betting that motor you saw had a few hands besides GM in it. Don't be fooled by this.
There are some things GM didn't get right......the plastic intake is an obvious one. the 195° thermostat is another, but GM did that for emissions reasons that were regulated. The factory seals and gaskets, however, GM got right. No question.
This isn't intended to be inflammatory. We don't always agree on everything around here, but if we don't discuss topics like this one, we don't learn.
Using RTV on the mating surfaces of the upper intake where the water passages are is an even worse idea. A small layer of RTV in an area that doesn't actually touch, and with 2 dis-similar materials that expand and contracts at different rates is asking for failure. That RTV will delam and allow coolant to wick.
The factory seals on these engines are very well designed. The best I've seen yet. I'm betting that motor you saw had a few hands besides GM in it. Don't be fooled by this.
There are some things GM didn't get right......the plastic intake is an obvious one. the 195° thermostat is another, but GM did that for emissions reasons that were regulated. The factory seals and gaskets, however, GM got right. No question.
This isn't intended to be inflammatory. We don't always agree on everything around here, but if we don't discuss topics like this one, we don't learn.
02-08-2003, 03:40 PM
#15
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On the Intake Bolts at the block surface according to GM, Loctite "Blue" should be used! The only "other" place on the ntake that requires any form of compound on the threads is the T-Stat Housing bolts, there I use Teflon Pipe Sealer with PST! 
02-08-2003, 03:42 PM
#16
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I wouldn't WANT to use RTV instead of the factory seals, even if it was a good idea. That would be a pain in the ***. The OEM gaskets and seals are a snap to install.
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