A broken EXHAUST rocker or bent or broken pushrod on the exhaust side will make them pop back into the intake manifold when the intake valve opens, as well as the things that can go wrong on the INTAKE side.
Also, it may have simply ingested a piece of oily debris from the intake manifold and lodged it under an intake valve, which will pass in time. (Intake is oily because of crankcase venting into the intake.)
Sometimes, a tip breaks off off a glowplug, which can get lodged/hammered under a valve, or a valve can even get bent by a piston smacking glowplug debris into a valve.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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