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92 1500 Loud Tapping Noise when accelerating

Jared Stangenberg
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Pistol Pete New Member

Pistol Pete

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On 10/2/2015 at 2:40 PM, ifixedit said:

Pull the valve covers and check for a broken or cracked rocker arm, sounds like that's what it is, they can break on a moments notice. If a rod was hammering that hard the engine would have very low oil pressure, would likely be smoking like a steam ship, and probably would have already quit by now, so I doubt it is a rod bearing. The 350 bottom ends are about as bullet proof as they come so it would be very uncommon for anything in the bottom end on these engines to let loose just like that under normal driving on a daily basis, that is unless you had REALLY abused it with some very high and prolonged RPM's over and over which I doubt you've done.

 

If all the rocker arms are fine, it could also be a collapsed lifter. Get the valve covers off, go over each rocker arm carefully looking for one that's loose. If you find a loose rocker arm that appears to be intact, then you've got a collapsed lifter and possibly a bent or damaged push rod as well as things were likely banging into each other with all the excess clearance. Look the parts over closely for damage before you decide to re-use them. Unfortunately a collapsed lifter that refuses to pump up will require removal of the intake to replace it. An old trick to free up the lifter is to add about a quart or so of kerosene to the oil and let it idle for a few minutes, if that doesn't take care of it the intake is going to have to come off to get at the lifter. If the kerosene trick does work you're going to want to change the oil ASAP.

Hello. I'm new to this site and so I'm aware this thread is fairly old. My question regarding checking the rocker arms is it better to warm the engine up 1st and then pull the covers to check the rocker arms?

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