Is emptying hydraulic tappet necessary?

Question

My car has hydraulic tappets. After doing repair work to the cylinder head, do I need to empty the oil out of the tappets before replacing them? The last thing I need is a piston with a valve-sized hole in the top.

Answer 1

No way man!!! Leave the oil in them!!! In fact everytime I build a motor with Hydraulic Lifters, I place them in a dish full of oil and press down on the seat until no more air bubbles come out. This is called "pumping up" the lifters. If they do not get harder to press down everytime , then they are worn out, and you should replace the lifters and the camshaft. If they bleed down excessively, you will hear valvetrain noise , and accelerate the wear on every part of the system.

Answer 2

Nope. If the tappet is not "bad (i.e., plugged or worn beyond the point that you should not be putting it back into your engine - - two items that probably do not apply to your situation) then there is no need to drain or bleed the tappets. This will happen when the spring pressure of installing them causes them to leak down just like they do in every engine after it is shut down.

Answer 3

Definitely don't want dry tappets---soak them in assembly lube or oil overnight in a coffee can to purge any air out----best thing is to build up oil pressure on first startup after motor work is done by cranking the engine with ignition disabled for about 20-30 seconds before starting---check the oil pressure dash gauge---if you have one---to see if it's registering pressure.

Answer 4

Seeing as you point out "Tappets or pushrods what ever" on your question, you haven't any longer everywhere taking this engine to bits. those use an oil fed hydraulic adjusting equipment. based which engine you have, may be a ball-stud and slipper affiliation, or a bucket form adjuster. there is relatively some paintings for a beginner. Take it to a sturdy mechanic and get a assure.