Are Supertech valve stem seals good?
Supertech make great products but from my experience I find OEM valve stem seals better. Yeah they have some good stuff out there. Ive decided to purchase the supertech seals aftrall. People can still chime in whats better and how it performed for theyre engines.
What are the symptoms of bad valve seals?
Bad valve seals nearly always show an intermittent problem of oil burning, whereas worn piston rings and valve guides will smoke during all times of engine operation and never disappear.
Why is my valve lash making a spongy noise?
If the rocker arm is free to move or there is a spongy feeling; it is a good indicator that the valve lifter is leaking down too fast; or not retaining oil from the engine. Once you locate the lifter that is causing the noise, you will need to determine the reason for its malfunction. This can be caused by the plunger being stuck in the valve body.
What do you need to know about valve lash adjustment?
A valve lifter (sometimes referred to as a tappet or cam follower); follows the contour of the camshaft lobe and transfers that motion to open and close the valves. Valve lash adjustment is a necessary maintenance requirement, for engines without hydraulic valve lifters. A solid lifter is a rigid component.
Do you need a feeler gauge to adjust a valve lash?
An engine equipped with a hydraulic cam does not require a feeler gauge. When adjusting the valve lash on an engine with hydraulic lifters, you are not really setting the lash or clearance. You’re actually setting the preload on the lifter through the pushrod and rocker arm.
What happens if you do an incorrect valve lash adjustment?
Power and mileage then dramatically decrease. The most serious result of incorrect valve lash adjustment is damage to the valves and related components. Setting the clearances loosely causes parts of the valve mechanism to hammer together, damaging valves and creating a knocking or rattling sound.
How does hot valve lash affect engine performance?
Using Valve Lash to “Tune” Engine Performance. For example, by reducing the amount of (hot) valve lash, the valve will open slightly sooner, provide slightly more lift (valve opening), and will close slightly later. This makes the camshaft look bigger to the engine, due to this slight increase of duration and lift.
What happens when a valve is adjusted too tight?
If adjusted too tight (the plunger fully compressed) the valves stay open slightly, and do not close all the way. This removes the important cooling time (lash) that removes heat from the valve stem.