The MLS gasket was released for production, as a running change, in the 1999 model year for all models except FJ.
The new gasket provides superior sealing characteristics but will require extra care in their installation where a composite gasket was previously in place.
Note: This information applies to models with a 2.0L SOHC/DOHC (naturally aspirated) or 2.4L engine.
Caution: Aluminum engine components are susceptible to metal transfer and surface damage when old gasket material is removed from them. Use extreme care when cleaning gasket material from aluminum components. The MLS gasket cannot properly seal if gouging of surfaces, metal transfer or composite gasket material is left on the head or block surfaces.
Equipment Required
1 Plastic or Wooden Scraper
1 2” 3M Roloc Bristle Disc, White (for aluminum surfaces)
1 2” 3M Roloc Bristle Disc, Yellow (for aluminum/cast iron/steel surfaces)
1 2″ 3M Roloc Bristle Disc Arbor
1 Drill Motor
Repair Procedure
This bulletin outlines the proper procedures for preparing head/block surfaces for MLS
gasket installation.
1. Following service manual procedures, remove the head.
2. Remove as much of the loose composite gasket material with a plastic or wooden scraper.
Note: Prior to additional cleaning, inspect the cooling passages of the head. Replacement may be necessary if excessive pitting or erosion has taken place that will compromise the sealing surfaces around the cooling passages.
3. Cover coolant and oil passages to the best of your ability and apply solvent or a commercially available gasket cleaner to the head/block surfaces. Allow the solvent to soften the remaining composite gasket material.
4. Using a plastic or wooden scraper, scrape the composite gasket residue from the surfaces. If necessary, apply additional solvent or gasket remover to ease removal.
5. If additional cleaning is needed, use a drill motor and 3M Roloc bristle disc (P/N 07528, white) to carefully remove the remaining gasket material from the head and block surfaces.
Note: If difficult-to-remove residue is left, the yellow Roloc bristle disk (3M P/N 07525) can be used. Use extreme care when power cleaning aluminum surfaces to prevent metal transfer.
6. Inspect the sealing surfaces for any remaining composite gasket residue. Carefully remove any remaining material.
7. The head and block must be checked for flatness. Follow appropriate service manual
procedures/specifications where applicable.
8. Spray both sides of the MLS gasket with a coat of MOPAR spray gasket sealant (P/N
0431 8035).
9. Re-assemble the engine as outlined in the appropriate service manual. Pay particular attention to head bolt torque and torque procedures. All head bolts should be oiled prior to assembly.
Note: The 2.0L DOHC torque and torqueing procedure has changed with the installation of an MLS gasket. Use the following procedures for the 2.0L DOHC only.
10. Make sure the cam sensor seal is replaced on all engine applications.
Note: A new cam sensor seal must be installed during the head gasket replacement procedure. Oil seepage from this seal can be misinterpreted as a head gasket leak.
11. Replace the engine oil and filter after performing these procedures.
2.0L DOHC Torque Procedure with MLS Gasket Installation
Note: The four short bolts are placed in the corners.
A. Torque all center bolts to 25 ft.-lbs. (34 Nm). Torque the four corner bolts to 20 ft.-lbs. (27 Nm). See Figure 1 for torque sequence.
B. Torque all center bolts to 50 ft.-lbs. (68 Nm). Torque the four corner bolts to 35 ft.-lbs. (47 Nm).
C. Re-torque all center bolts to 50 ft.-lbs. (68 Nm). Re-torque the four corner bolts to 35 ft.-lbs. (47 Nm).
D. Tighten all bolts in the specified sequence (Figure 1) an additional 90° (1/4 turn).
Revised 2.4L Cylinder Head Re-torque Procedure
This information supersedes the previous technical bulletin, dated March 25, 2005. The previous bulletin should be removed from your files. This bulletin applies to vehicles equipped with a 2.4L engine built between Feb. 1, 2004 and April 5, 2005.
1. Using a 6” wobble plus extension friction ball and shallow socket following the torque sequence (Figure 1), loosen one bolt at a time to 0 torque and then torque that same head bolt to 60 ft.-lbs.
2. Repeat Step 4 for every head bolt, one bolt at a time in sequence.
3. Verify that each head bolt is at 60 ft.-lbs. before performing next steps.
4. After all head bolts have been verified to be torqued to 60 ft.-lbs., follow the torque sequence and turn the head bolts an additional 90° (1/4 turn) (Figure 1).
5. Following the appropriate procedures, install the cylinder head cover.
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.