well,as you may have seen we're pulling engine out of my oldest son's '93 RR and had some challenges over the turkey day holidays.Then my 2nd son's girlfriend was just about to leave('97 DISCO1) and go back to college when i heard an exhust leak. went under and tightened it up and it was gone BUT then i heard what i thought was a vacume leak . after looking closely it appears there is a intake manifold leak between passenger side head and the manifold(note: it appeard that someone had taken off one of the injector leads in same area),in the very center. i sprayed a little WD40 in that area and heard a change of noise NOW what would cause this type of problem and are there any precautions i need to know about the 4.0 verses the '93RR 3.9 in removing and replaceing intake.we intend on starting today 01/01/2009 reply asap

 

Most likely it is that $48 intake manifold gasket under the intake that joins the upper manifold to the lower. When they get old and sometime oil soaked they can leak.

 

now remenber, it is between the lower intake and the head .the price sounds correct, and you are talking about the intake valley pan gasket. i have replace one before but not on a 4.0 are there any major differences?

 

The 4.0 GEMS and the 3.9 GEMS are the exact same engine.
The only difference is the distribitor.

 

thanks, thats what i wanted to know

 

No, I wasn't talking about the valley pan gasket but one refered to as the intake manifold gasket. It is a rectangular gasket between the upper and lower manifold that seels the 8 intake tubes. If you were to see it you would see the rect5angular shape with 8 apx. 1" holes.
When they get old, they can dry rot or they can also suck up oil and burn it through the cylinders.

 

I think thats a mighty fine gesture there - lending out your mechanical know how like that. Cheers

Robert

 

whats the best way to support trans while pulling the engine on my son's '93 3.9 RR so it does't fall

 

Your mother-in-law.

 

well i took that manifold off and found that on the center intake area ,right at the port on the head ,pass side, some how the right top corner had folded inward toward the port allowing a intake vacume leak. so we ordered valley pan set. should be easy fix