![]() However, there may be a turbo crank with a different casting number out there, so don’t be surprised if you stumble on one in a core. This crank must be used with any platform that has “NGC” including all FWD applications beginning in 2003, the Liberty in ’04 and the Wrangler in ’05.Īccording to the parts book, Chrysler used a different crank for the early turbo motors, but both of the new turbo short blocks we bought while researching these engines had the 4781590AA casting, so Chrysler has apparently decided that the regular cast crank is strong enough for the turbo motors, too. The 4781590AA crank has a “target ring” with 32 windows bolted on the back of the rear counterweight. It was used for both the Liberty and the Wrangler in ’03 and for the Wrangler in ’04, because the RWD platforms weren’t changed over to “NGC” until ’04 and ’05. This crank was used for the platforms that came “without NGC,” meaning they had the old style computer, so it was used for all the FWD applications until ’03 when they were changed over to the “next generation controller” (with NGC). It can be identified by the “sensor ring” with 18 windows that is machined right on the second counterweight. The 4621916 casting was used from 1995 through 2002 for all the FWD applications and for some RWD applications in 20. There have been two cast cranks used in the 2.4L from beginning to end, one that has the sensor wheel machined directly on the second counterweight and one with a bolt-on “target ring.” The revised 53010502AB casting was used for the Liberty in ’04 and ’05 and the Wrangler in ’05 and ’06. The RWD block was revised in 2004 to accommodate the bolt-on “target ring” with more notches that was used with the new “NGC” computer so the hole for the sensor was moved over to the driver’s side and back toward the bell housing, just like it was on all the ’03 cars. The Catch-22 is that this block was used for both the Wrangler and Liberty in ’03, but only for the Wrangler in ’04 because the Wrangler platform continued to use the old style computer and crankshaft (without “NGC”) through ’04 even though the Liberty got the “NGC” computer along with a new block and crank in ’04. These blocks have “RWD” cast on the passenger side so they’re easy to spot. The RWD block is a unique casting (53010502AA) that doesn’t have the “ear” that sticks out from the front of the block down by the pan rail on the passenger side of the FWD blocks. Look for a 4781632AA/AB casting.Ĭhrysler installed the 2.4L motor in both the RWD Jeep Wrangler and Liberty beginning in 2003. There were some other changes made to accommodate the turbo motor, too, including a boss on the passenger side that can be drilled for the oil return from the turbo and an additional oil galley inside the block that’s machined for the four “oil squirters” that are used to help cool the pistons on the turbo motors. There was another all new FWD block in ’03 that incorporated several more changes, but the most noticeable one was the change in the location of the hole for the crank sensor it was moved from the front of the block on the passenger side to the back of the block on the driver’s side in order to accommodate the new, bolt-on “target ring” for the crank sensor. It’s an all new casting that has 4781655AA on the driver’s side. It’s a 4621443AB casting.Ģ002: The oil drainback hole in the head was enlarged in ’02 so there was another “bulge” added to the block on the driver’s side, between the third and fourth cylinders. The hole for the oil pressure sender on the passenger side was moved back about 6? in 2001 so it was much closer to the bell housing. The original casting was a 4621443 block that had a 4621445 bedplate. And, the latest FWD block may or may not be machined for a turbo application. There are six distinctly different castings including four FWD blocks and two RWD blocks.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |