Intake manifold gasket leak?

[eohat]

What is the purpose of the foam insulator?


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I think it’s supposed to channel water away from the knock sensors but it doesn’t do that very well. The rear one does a great job of trapping dirt and debris under the manifold.

 

[Newkon]

Yes I was watching a video of a guy that was saying the foam insulators are to keep water from entering the knock sensor holes. He recommended that you take the rear insulator out completely because it tends to keep water instead of prevent it.

 

[Newkon]

I think it’s supposed to channel water away from the knock sensors but it doesn’t do that very well. The rear one does a great job of trapping dirt and debris under the manifold.

Eohat, Is there another name for the valley cover gasket? Im assuming that its the gasket under the plate that holds the knock sensors but I'm having a hard time finding the gasket when I search for valley cover gasket. Thanks!

 

[95escahoe]

Eohat, Is there another name for the valley cover gasket? Im assuming that its the gasket under the plate that holds the knock sensors but I'm having a hard time finding the gasket when I search for valley cover gasket. Thanks!

https://www.amazon.com/gp/aw/d/B006...3_1?ie=UTF8&psc=1&refRID=K90Y6E6KAB1H3JQJ03FM

That what your looking for?


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[Newkon]

https://www.amazon.com/gp/aw/d/B006...3_1?ie=UTF8&psc=1&refRID=K90Y6E6KAB1H3JQJ03FM

That what your looking for?


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Great thanks!!

Is there somewhere that tells me the specs for tightening the bolts and the sequence in doing so?

 

[Tonyrodz]

Great thanks!!

Is there somewhere that tells me the specs for tightening the bolts and the sequence in doing so?

F you don't have a Chiltons or something similar, you could Google torque specs and sequence.

 

[Newkon]

F you don't have a Chiltons or something similar, you could Google torque specs and sequence.

I found the specs for the intake manifold. Do the valley cover bolts need to be torqued to a specific pound? I tried to find info on it and didn't come up with anything.

The intake manifold is 44 in-lb on the first pass and 89 in-lb on the second pass in sequence.

 

[Tonyrodz]

I found the specs for the intake manifold. Do the valley cover bolts need to be torqued to a specific pound? I tried to find info on it and didn't come up with anything.

The intake manifold is 44 in-lb on the first pass and 89 in-lb on the second pass in sequence.

I've never done one on our trucks before, but I'd think there would be a specific torque along with sequence too.

 

[eohat]

I found the specs for the intake manifold. Do the valley cover bolts need to be torqued to a specific pound? I tried to find info on it and didn't come up with anything.

The intake manifold is 44 in-lb on the first pass and 89 in-lb on the second pass in sequence.

Yes, there’s a torque spec for the engine valley cover bolts.

http://www.tahoeyukonforum.com/threads/engine-torque-specs-00-06-4-6l-5-3l-6-0l.56547/

I couldn’t find the torque sequence for the valley cover bolts. Maybe someone here has the sequence; it wasn’t in the Haynes manual. I started with the middle row and worked outward in an X pattern, like the intake manifold bolt torque sequence.

 

[Newkon]

Yes, there’s a torque spec for the engine valley cover bolts.

http://www.tahoeyukonforum.com/threads/engine-torque-specs-00-06-4-6l-5-3l-6-0l.56547/

I couldn’t find the torque sequence for the valley cover bolts. Maybe someone here has the sequence; it wasn’t in the Haynes manual. I started with the middle row and worked outward in an X pattern, like the intake manifold bolt torque sequence.

Thank you for the link to the thread! very useful. Found all of the information I need to tackle this job!