How to Tighten the Intake Manifold Bolts on a 1998 Cherokee

The intake and exhaust manifolds on the Jeep six-cylinder engine are sealed by a common gasket. Therefore, the manifolds must be serviced as a single unit. Dowel pins in the cylinder head help locate the gasket and manifold during installation. Any bolt that is easily started can be used to hold the assembly in place, while all the other bolts are partially installed. The 1998 edition of the 4.0 liter requires only modest torque values to seal the manifolds, but all lower bolts must be reached from underneath the assembly.

Instructions

1

Tighten the two lower bolts on either side of the center exhaust manifold down-tubes, starting with the rearmost of the two. Proceed to the upper bolt above the center of the same tubes. The final torque value for these bolts is 24 foot-pounds.

2

Tighten the lower bolts to the left and right of the previously tightened lower bolts, in that order. Both of these bolts are inboard of the cylinder-head dowel pins. Torque these two bolts to 24 foot-pounds. Tighten the two outermost lower bolts of the exhaust manifold to 23 foot-pounds, front bolt first.

3

Tighten the upper bolt that is second from the front, and then the front bolt to 24 foot-pounds. Proceed to the second-to-last bolt, and then the last, or rearmost bolt. Final torque for these bolts is 24 foot-pounds.