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Many Jeep owners need how-to information on checking valve clearances and adjusting the hydraulic valve lifters on the inline 232, 258 and 4.0L six-cylinder engines and the 2.5L Jeep pushrod engine. Between the model years 1971 and 2006, Jeep used these AMC-design 232, 258 and 4.0L sixes and the 2.5L straight four-cylinder engine (1983.5-2002). The hydraulic lifter and valvetrain design has particular needs, especially the valve clearances. When these engines develop valvetrain noise, owners often think a valve adjustment will cure the problem. In each of these AMC/Jeep engines, valve clearances are set during assembly of the engine, and adjustment is not necessary between engine rebuilds. If your engine has developed valvetrain noise, or if you are in the process of rebuilding the engine and need to know more about setting valve clearances, my HD video from 4WD Mechanix Video Network at Vimeo will assist. This video was originally a Q&A Vlog at the magazine, now available for a broader viewing audience through Vimeo. Moses
Had my 1971 CJ5 225 V6 rebuilt. Machinist decked the block 0.065 and angle milled the heads 0.125. I am having problems with push rod lengths and intake manifold fit. The machinist did not mill the intake side of the heads to match the head rotation or machine the intake manifold for the change. I appear to have a vacuum leak under the manifold. Possibly not seating low enough. The push rods also appear to be too long not allowing the valves to seat correctly. I am looking at adjustable push rods from TA Performance for the push rod problem. but I am not sure how to address the manifold issue. How do I determine how much to machine off the manifold and at what angle? I am using an Offenhauser Dual Port manifold. Should the intake side of the heads be machined to correct the angle to match manifold angle?