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CHRYSLER A604 - Cooler Bypass Check Valve Added To Case

Posted on by Amos

CHANGE: Beginning in 1991 model A604 transaxles, there has been a "Cooler Bypass Check Valve Assembly" added in the transaxle case behind the oil pump.

REASON: Lack of cooler oil flow in extreme cold climates, more obd2 scanner? because of transaxle fluid "Jelling" (0°Fahrenheit or Below).

PARTS AFFECTED:
(1) COOLER BYPASS CHECK VALVE - added into the case cooler passage behind the oil pump. If cooler oil flow is restricted, or blocked, the new check valve will open, and allow cooler feed oil direct into the lube circuit to prevent transaxle damage. Normal operation is resumed after oil temperature is warm enough to again flow through the cooler.

NOTE: Customers should be advised to let the vehicle warm-up thoroughly before attempting to drive the vehicle, especially in the colder climates.

(2) TRANSAXLE CASE - The new case has added material between the two cooler line fittings, to accommodate the machining process needed for the new cooler bypass check valve assembly.

(3) VALVE BODY SPACER PLATE - Lube feed hole in spacer plate has been enlarged to .112".

INTERCHANGEABILITY:
Cooler bypass check valve assembly "WILL NOT" retro-fit back to previous models, unless the new transaxle case is installed at the same time. If you want to find some tools like vas 5052a and vag pin reader, search the vtoolshop.
The lube feed hole in the spacer plate can be drilled to .112" on all models to improve lube oil flow.

SERVICE INFORMATION:
Cooler Bypass Check Valve Assembly ....................................................................... 4539880
Transaxle Case Assembly, 3.0L (1991) ...................................................................... 4567015
Transaxle Case Assembly, 3.3L (1991) ...................................................................... 4567016
Transaxle Case Assembly, 2.5L (1991) ...................................................................... 4567017

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