How to replace exhaust manifold gasket 1989 jeep wrangler 4.2

This is pretty straight forward, you need to locate the exhaust manifold and follow it down to where it connect to the exhaust pipe, there three bolts on the joint and you take those out. Then see if you can separate the pipe from the manifold. If you cannot separate them then you need to get under the jeep and loosen the holders for the exhaust pipe. When you can separate the joint, take the old doughnut out and put in the new one. Make sure that you get it tight and that you tighten the bolts evenly. Don't over tighten one side.

why are you replacing the bellhousing?,it means you are going to have to pull out the motor or the gearbox/transfer case,whichever is easieast

There is a vacuum leak from installing the intake. Common problem. The exhaust and intake use a common gasket. When reinstalling the exhaust manifold, there are two guide pins, one front of the manifold and one in the rear. What usually happens is that the manifold sits ON these pins when installed and it creates a vacuum leak when the engine is started that instantly races the engine. The manifold has to be removed and when reinstalled, MAKE SURE the pins are IN the guideholes on the manifold.

check your local junk yards can do nothing but replace

Head gasket

The best fix is to install the two piece OEM manifold from the later model (2000's) wranglers. There are also manifolds with accordian type flex joints for sale on line that will last MUCH longer than the one piece OEM manifolds.

The intake manifold is the common culprit for this. It may look like it is flush to the block, but it isnt and is causing a huge vaccum leak. There are two locating dowel pins that the manifold must be flush on before tightning the bolts. The usual problem is that the manifold is resting on top of these pins instead of flush, causing a gap. You have to unbolt the intake and exhaust manifolds, relocate the intake and replace the bolts.

Do you mean the O2 sensor? That's located on the exhaust just below the carb.

Check and review this info: ZJ-Secc-11-Exhaust-System-and-Intake-Manifold

In this pages find several graphics that can be help you.

Good luck!!!

not that hard you drop the exhaust and take the manifold off and replace it with a new one, you have to lubricate the bolts to get them out but anyone can do it