Head Gasket Leaks/Seepage Found in 1987-93 Jeep 4.0L Engines - Engine Builder Magazine

Head Gasket Leaks/Seepage Found in 1987-93 Jeep 4.0L Engines


1987-1992 (MJ) Comanche, (XJ) Cherokee, (YJ) Wrangler

1993 (ZJ) Grand Cherokee

Some vehicles equipped with a 4.0L engine, may experience engine oil leaks/seepage from the head gasket along the right hand side (tappet rail) of the engine. A new cylinder head gasket is now available. The new gasket has beaded silicone sealer on both sides to eliminate leakage/seepage.


Verify the oil leaks/eepage is coming from the cylinder head gasket by visual inspection, or using fluorescent tracer dye or by doing a low pressure leak test.


This repair involves replacement of the cylinder head gasket with a revised gasket using instructions outlined in the appropriate service manual using cylinder head gasket p/n 53020219 or equivalent.

Coat a new head gasket with suitable sealing compound and place it on the block. Most replacement gaskets will have the word TOP stamped on them.

NOTE: Apply sealing compound only to the cylinder head gasket. Do not allow sealing compound to enter the cylinder bore. The 1991-’98 cylinder head gaskets used on the 4.0L are a composition gasket. This gasket should be installed dry. Do not use sealing compound.

Install the cylinder head and bolts. The threads of bolt No. 11 must be coated with Loctite® 592 sealant before installation. Tighten the bolts in 3 steps, using the correct sequence:

   1. Tighten all bolts to 22 ft. lbs. (30 Nm).

   2. Tighten all bolts to 45 ft. lbs. (61 Nm).

   3. Retighten all bolts to 45 ft. lbs. (61 Nm).

   4. Tighten bolts 1 through 10 in sequence to 110 ft. lbs. (150 Nm).

   5. Tighten bolt 11 to 100 ft. lbs. (136 Nm)

   6. Tighten bolts 12 through 14 to 110 ft. lbs. (150 Nm)

NOTE: Cylinder head bolts should be reused only once. Replace the head bolts which were previously used or are marked with paint. If head bolts are to be reused, mark each head bolt with paint for future reference. Head bolts should be installed using sealer.

Some or all of this information was provided by the Automotive
Parts Remanufacturers Association (APRA). For more information on
technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com.
Cylinder head torque sequence.

You May Also Like

Shop Solutions January 2023

Next time you have set of large journal small block Chevy connecting rods to resize, consider honing the big ends of them for a +.002” outside diameter bearing that the LS engines with fracture cap rods use.

Engine and Machine Shop Tips and Tricks


For proper block cleaning, the oil bypass valves in Gen 5 and 6 big block Chevys need to be removed. We made a couple different sized “hook” tools for a slide hammer. This tool will easily pull the valves out of the block and sometimes without damaging them.

Shop Solutions December 2022

Everyone misses occasionally, and this helps avoid dents and damage.

Jesel Certified Performance Rebuilds

Engine components are serious investments for any racer and maintaining that investment could be the difference between winning a championship and losing it.

Going the Extra Mile with Cylinder Head Porting

It’s not just the port work alone that creates spectacular cylinder head performance. The most critical areas of a cylinder head are those which pass the most air at the highest speed and for the longest duration. Your bowl area, the valve job, the throat diameter, and combustion chamber are all crucial parts. 

Tight Tolerances and Building Power

As you ascend Mt. Everest, you reach an area called the death zone. Once you climb high enough, the margin of error becomes perilously thin. That death zone also applies to engines. As the horsepower per cubic inch and rpm increase, the margin of error decreases. 

Other Posts

CNC Update: Features and Automation

Precision is key when it comes to automotive parts; the complex designs of connecting rods, pistons and rings, blocks, cylinder heads, and other parts require super tight tolerances that are getting more and more difficult to be met by hand or with other machining processes outside of CNC.

All Things Media Blasting

Engine building is a segment of the automotive industry that has always been ahead of the curve in media blasting, and no matter the engine shop, cleaning equipment is a common bond.

Engine & Hub Dynos: Necessary Tools and Additional Revenue

Being able to see the horsepower and the direct correlation to what is lost in the driveline is invaluable – dynos offer a myriad of benefits for the modern engine shop.

November 2022 Shop Solutions

November tricks and tips for the shop!