Engine >> OIL FILTER REPLACEMENT CAUTION ON AMC 4.2L ENGINES
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Engine >> OIL FILTER REPLACEMENT CAUTION ON AMC 4.2L ENGINES
Oil Filter Replacement Caution on
Chrysler (AMC) 4.2L (258 CID) Engines
Chrysler Corporation cautions on the replacement of oil filters on 4.2L (258 CID) AMC built engines.
Engines built prior to 1987 utilize an oil filter without internal bypass architecture. A bypass valve is necessary to provide adequate lubrication to the engine should the oil filter become clogged. Engines using this style filter have a bypass valve assembly built into the cylinder block (see illustration).
This earlier filter design features a .813 connector thread.
Engines built during and after 1987 do not have the built-in bypass assembly and therefore utilize a filter assembly containing the bypass valve. The later model filter design features a 20mm (.787) connector thread.
Do not use the earlier style filter on engines built during and after the 1987 model year. Incorrect filter application may result in serious engine damage.
The AERA Technical Committee
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