Dirt and Debris Accumulating at Rear Main Seal on 1997-2005 Jeep 4.0L Engines - Engine Builder Magazine

Dirt and Debris Accumulating at Rear Main Seal on 1997-2005 Jeep 4.0L Engines

Your engine customer/installer may complain of oil seepage from the rear main bearing seal, but a closer insepection may reveal the cause of the seepage is due to the accumulation of dirt and debris around the outside of the rear main seal on some 1997-2005 4.0L Jeep engines. This condition may occur more frequently if the vehicle is used in off road conditions.

A spacer plate is used to mate the transmission bellhousing to the back of the engine. The spacer plate has a slot machined into it at the 12 o’clock position (Figure 1). A small opening may occur at the spacer slot when the spacer is mounted. The narrow spacer opening at the top of the transmission bellhousing may allow small size debris to enter the bellhousing and accumulate around the outside of the rear main engine seal.  If debris accumulation becomes significant, damage to the rear main seal may result (Figure 2).

Repair Procedure:

1. Locate the narrow opening created by the spacer plate. The spacer opening can be viewed when looking towards the rear of the engine and top of the transmission.

2. Thoroughly clean the immediate area around the spacer opening with throttle body cleaner (p/n 04897156AA). Allow cleaner to dry.

3. Apply a sufficient amount of RTV over the spacer opening. Verify that the spacer opening is completely sealed off by the RTV.

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.  
figure 1 
	</div><!-- .entry-content -->

		<footer class=

You May Also Like

America’s Best Engine Shops 2022 | Choate Engineering Performance

This shop’s dedication to quality engine work, its growth, its machining capabilities and its impact in the diesel industry, all make Choate Engineering Performance well deserving of Engine Builder’s and Autolite’s 2022 America’s Best Diesel Engine Shop award.

Necessity is the mother of all invention, and it certainly played a role in the founding of Choate Engineering Performance. The diesel engine and machine shop was founded by shop owner, Cass Choate, after finally becoming fed up with having to rely on others for certain aspects of his work.

America’s Best Engine Shops 2022 | 4 Piston Racing

The 4 Piston Racing facility in Danville, IN houses two buildings – one is 12,000 sq.-ft. and the other is 2,500 sq.-ft. The shop is very heavily focused on Honda cylinder heads and engine work to the tune of 300+ engines and 1,000 cylinder heads annually!

Randy Bauer Shares His Experience as PERA President

We recently spoke to Randy about his PERA presidency and what some of the biggest hurdles are facing the engine remanufacturing industry right now.

Women in Motorsports: Mattie Graves

Mattie Graves competes in the Outlaw Diesel Super Series (ODSS) dragster class, and is the only female doing so in a class that already has very few competitors in general. Find out more about this up and coming diesel drag racing star.

Women in Motorsports: Johnna Dunn

She got her drag racing license before she got her regular license, and that tells you everything you need to know about Johnna Dunn. She’s a drag racer and clutch specialist for her grandfather’s NHRA Top Fuel Funny Car team, Jim Dunn Racing.

Other Posts

Women in Motorsports: Kayla Blood

A veteran of the military, a former track star, an MMA fighter, Motocross and ATV racer, and now a Monster Jam driver, Kayla Blood has packed a lot into her still growing career. Now the driver of Soldier Fortune, she strives to make a name for herself and for other women looking to make motorsports a career.

Women in Motorsports: Felicia Smith

Felicia Smith was never a huge gear head. However, following her first taste of speed at the track, she’s been living a life of cars and racing ever since. She’s taken the past six years to build up her CTS-V and her own car/engine skills in an effort to share it all with the car community.

Women in Motorsports: Jillian McLaughlin

Not all of us start out in this industry. Take Jillian McLaughlin for example. The once hairdresser is now an engine builder helping do a little bit of everything at Precision Machine Engine in California.

Women in Motorsports: Janine Shoffner

Whether it’s motorcycles, skydiving or road racing, Janine Shoffner has an addiction to adrenaline-filled activities. For the last decade, road racing has been her biggest passion as a co-founder of J2-Racing.