Roller rocker arm. The rocker are in the head that transfers the camshaft action to the valve. Opens and closes the valves. On a roller rocker, there is a small roller on the lifter end of the rocker arm. Some small gain in performance due to lack of friction. Very small. In a complete engine overhall where everything is done just right to improve performance, each little bit can have a combined affect that does improve the overall performance. Changing the rockers by themselves is not wort the expense.
Take off one of the valve covers, if the rocker has a roller tip on the side which it touches the valve spring then its a roller, if no roller tip is present then its a normal tappet rocker.
A valve spring "keeper" or AKA a valve spring "retainer" is used to lock a valve spring to the valve.
Valve pocketing is when a valve is hammering the valve seat.mostly due to miss adjusted valve spring/wrong valve spring/to strong of a valve spring or valve stem to short.Makes the valve seat deeper.
vale springs dependon what lift your cam is . need to know what lift cam it is where can get the correct pounds spring if not can have one BIG HEAD ACHE.
how many positions does a spring offset valve have
you need to compress the spring with a valve spring compressor tool, and then remove the valve keepers, and retainer.
The valve spring is the spring that closes the valve in the engine head after the cam lobe or rocker opens it . If the valve didn't close, many things would happen , the main one being the motor would not fire .
That would be a hydraulic roller tappet valve train.
Your engine will probably missfire and you will not have compression in the cylinder that has the broken valve spring because your valve will stay open.
Spring loaded safety valve.
A valve spring compressor
pull a valve cover and look for roller rocker arms.
The roller slides onto the handle from the side. Some handles have a nut that pust be unscrewed first, some have a spring that simply slides into the center of the roller.
The purpose of the valve spring is to close the valve when the cam has finished pushing it open to allow fuel/air in or exhaust gases out. The spring is held in place at the top of the valve by a split-collet, like 2 halves of a cone, and also sits against the outside of the cylinder head. The spring is compressed when the cam on the cam shaft pushes it down, and as the cam moves away, the spring forces the valve shut again.
its usually somewhere on the part of the valve that encases the spring
A valve spring compressor is used to remove collets in a car. The tool compresses the valve springs in the cylinder head of the car allowing the collets to be removed.
KD Tools Valve Spring Compressor 3087
There are valves in the head of the motor. They open to let in air and exhaust out. There is a spring around each one that keeps them closed until the camshaft forces the valve open. Edit: Another way to put it is that the valve spring's job is to close the valve once it's opened by the valve train. The stronger the spring, the quicker it closes the valve and the higher the RPM the engine can operate without 'floating' the valves. The tradeoff is that the stronger the spring, the harder it slams the valve against the seat, reducing each's useful lifetime.
No the valve seals are between the cam and the head, under the valve spring
To retain the valve to the valve spring, could also be called keepers
The Oldsmobile LX5, 3.5L V6 is a (DOHC) dual over head cam, engine. It doesn't have rocker arms, but roller cam followers. The followers itself can fail in the form of a faulty roller, but more likely the hydraulic tappet/slack adjuster that the end of the follower rides on or the valve spring itself is faulty/broken.
If only one spring were used on each valve, the valve would surge and bounce because of the natural vibration frequency of the spring.
constant support spring Roller Clevis Trapeze
Broken valve spring