Re: 2002 FORD Explorer XLT question
I would not recommend that 4.0 SOHC engine to anyone. Multiple timing chains tensioned with large flimsy chunks of plastic and 1 of the 3 chains is in the back of motor against the bell housing.
Why Ford decided to cobble OHC's onto the old 4.0 OHV that was pretty durable is beyond me but I saw and heard so many 4.0 SOHC's with bad tensioners and broken chain guides with loose rattling timing chains and the resulting valve damage that it really saddens me that Ford did that to their customers.
I love my 99 Exploder with a 5.0 V8 that has logged 180k trouble free miles.
Jeep 4.0 Grand Cherokee's, Chevy/GMC 4.3 SUV's and V8 Exploders are known reliable rides so I would not recommend for anyone to get potential junk when they could get something known to be durable and reliable.
Here's a beaut from the blue oval Boys, and hey I'm a huge Ford fan, just not a fan of rubbish.
TSB 02-7-6 4.0L SOHC Timing Chain Rattle
*Engine - 4.0L SOHC - Rattle noise from primary chain drive area between 2K-3K RPM - Cold engine operation only
*Noise - Rattle noise from primary timing chain drive area between 2K-3K RPM - Cold engine operation only - vehicles equipped with 4.0L SOHC Engine only
Ford: 99-02 Explorer, 01-02 Sport Trac, Explorer Sport, Ranger
Mercury: 99-02 Mountaineer
Issue:
Some vehicles equipped with the 4.0 SOHC (Single Over-Head Cam) engine may exhibit a Primary Timing Chain rattle noise. The noise is audible during hot and cold engine operation (but predominantly found on cold engines) under acceleration, typically at 2400-2500 rpm. To confirm presence of this noise, accelerate in 2nd gear between 2000-3000 rpm and listen for rattle noise that sounds similar to spark knock. This may be caused by the Primary Timing Chain Tensioner system.
Action:
Replace the Primary Timing Chain Tensioner, Chain Guide, Jackshaft, and Crankshaft Sprockets with a Primary Timing Chain Tensioner Kit. The kit includes an improved Primary Chain Tensioner, as well as updated Primary Chain Guide, Jackshaft, and Crankshaft Sprockets. Required fastners, primary timing chain, and front cover gaskets are also included. Refer to the following Service Procedure for details.
Service Procedure:
Verify the condition. Obtain the correct kit and follow the sheet supplied with the kit.
Use kit 2U3Z-6D256-AA (balance shaft engines) for:
-99-01 4x4 Explorer/Mountaineer
-01-02 4x4 Sport/Sport Trac
-All 02 Explorer/Mountaineer, except engine codes 2G-960-AA and 2G-964-AA
Use kit 2U3Z-6D256-BA (non blance shaft engines) for:
-99-01 4x2 Explorer/Mountaineer
-01-02 4x2 Sport/Sport Trac
-02 Explorer/Mountaineer with engine codes 2G-960-AA and 2G-964-AA
-All 2001-02 Ranger
Labor Time: Estimated around 6 hours
Warranty Status: Elgible under the provisions of Bumper to Bumper warranty coverage