Chrysler Engine >> CAMSHAFT HOUSING CAUTION
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Chrysler Engine >> CAMSHAFT HOUSING CAUTION
Camshaft Housing Bore Align Bore Caution On
Chrysler 3.0L OHC Engines
It is common practice to reclaim the camshaft bearing surfaces on overhead camshaft engine cylinder heads when the camshaft has seized in the cylinder head. Usually the cam bearing caps are cut at the parting face and then the housing bore is align bored.
In the case of the Chrysler 3.0L engine this could lead to trouble, especially when more than .015 of material is cut off the cam bearing caps. As shown in the illustration, the rocker arm shafts and cam bearing caps form an integral assembly. Therefore, removing material from the cam bearing caps brings the rocker arm shafts closer to the valves.
Since valve lash is controlled by small lash adjusters that are located in the rocker arms, there is not very much room to play with before valve geometry is seriously affected. The result is valves that remain open even if the installed valve stem height of 1.635-1.650 is maintained.
It is best to remove as little material as possible from the cam bearing caps or if this is not feasible, reclaim the bearing surfaces through welding. Alternately, it is possible to fit the cylinder head for aftermarket cam bearing inserts.
The AERA Technical Committee
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