Question about 1993 Ford Explorer Limited

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I have a 1993 ford explorer with a 4.0. have replaced head gaskets and find that the hyd lifters are pumping up to the point they are keepeing the valves open. have changed lifters and have the same problem. what will cause this ?

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  • dmburdett Sep 28, 2009

    heads were not milled. my 15year son ran it hot ,this blowed the gaskets. push rods were never changed. can bottom cyl ouy and check with rockers loose and have around 120 psi compression. it is as if the lifters will not bleed down to adjust the valves to zero lash. thanks

  • Richard Scordino May 11, 2010

    If the cylinder head was milled, it's possible the push rods are now too long. some engines also use different length rods on intake and exhaust check and see if that's the case with may have mixed them up.


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You are not letting them bleed down.

The lifters will stay "pumped" for some time after the engine is first started. Sometimes its so bad the engine won't start (if fully pumped). If the engine won't start, you can cycle the engine by hand and compress the valve springs and let it sit for a time and they will bleed down (a couple at a time then turn 1/4 turn or so and wait again), but the easiest way is to run the engine at zero lash and tighten the rockers to spec. (one CYLINDER at a time) and let the other cylinders run until the miss goes away. When the miss goes away that cylinder will be at adjusted zero and you can move to the next cylinder. The thinner the oil the faster it will stabilize (which means engine hot).

If the engine will start at adjusted (but pumped up) lash, just let it run. It could take up to 30 minutes for the lifters to leak down.

Lastly, you can pull the lifters out, remove the snap rings, remove the plungers and drain the oil. Reassemble the engine with "dry" lifters, adjust them static (engine off) then start the engine. After the engine warms up they should fill with oil and run normally.

If you don't know how to do any of this, you probably shouldn't be in there to begin with. If you adjust them incorrectly you can damage your engine.

Some engines have no adjustment and those you just have to wait to stabilize. If they won't start, you turn them by hand and let them bleed down.

Posted on Sep 28, 2009

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Just did a quick check of pushrods for your engine...there are three different length listed. That tells me there are options, one of which may solve your problem.

Posted on Sep 28, 2009

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