03 Moutaineer changed Intake manifold replacement issues

[edcantu9]

followed all instructions and torqued in 2 stages. I now have a leak in the back passenger side. I pressure tested it and I can see the coolant leaking out. No where else. This leak was not there before the change. I cleaned the surface before installing new manifold.

Any suggestions? I was told that I needed to RTV the old OEM gasket alignment holes. I did not do this. But I read that this would cause vacuum issues. Would this also cause coolant leaks if I did not RTV the holes?

 

[boominXplorer]

What manifold did you install? Dorman or factory? The dorman has an extra heater hose outlet in the back that could be leaking.

 

[edcantu9]

What manifold did you install? Dorman or factory? The dorman has an extra heater hose outlet in the back that could be leaking.

Thanks for the reply, I used the Dorman 615-775. is the extra heater hose on the driver on passenger side? How would I go about stopping it from leaking? I appreciate your time in responding!

 

[boominXplorer]

Passenger rear. It usually has a cap with a crappy clamp. It's like a 5/8 diameter

 

[edcantu9]

Passenger rear. It usually has a cap with a crappy clamp. It's like a 5/8 diameter

Yes but the leak is not coming from the cap, its coming from the bottom where the aluminum and gasket meet. Any ideas why it is leaking?

 

[boominXplorer]

They have the o ring gaskets instead of the plate gaskets, you don't have both installed by chance do you? You also could of got a peice of trash on there between mating surfaces as you were shifting the intake into place.

 

[edcantu9]

They have the o ring gaskets instead of the plate gaskets, you don't have both installed by chance do you? You also could of got a peice of trash on there between mating surfaces as you were shifting the intake into place.

No just the orings. I will take apart this week and hopefully it is something I can figure out.

 

[IPcamper]

Double check the aluminum surface for any pits, scratches, or corrosion that might keep the o-rings from sealing. I usually put a thin smear of RTV on the o-ring right before installing to help get a good seal.

 

[edcantu9]

Double check the aluminum surface for any pits, scratches, or corrosion that might keep the o-rings from sealing. I usually put a thin smear of RTV on the o-ring right before installing to help get a good seal.

I took it apart, its amazing how experience helps, it took less than an hour to get if off as opposed to 2.5 hours the first time.

There is a bit of corrosion in that exact spot where the leak is, I will take it off and hopefully that will be it!

I am interested in your last sentence. For example I would put a dab on my finger and put a light coating on the gasket that will contact the aluminum?

 

[IPcamper]

That is what I usually do, but if the corrosion is a bit deeper, then put a little more on so it fills the area.