its a vauxhall movara van and i need help im trying to found out wether the valves are broken all the springs are upright and all level , so does this mean there ok ? or not ... thanks
The valve can be bent or broken under the head. Just because it looks right up top only means the stems are OK. The stems are usually OK, even if the valves are bent and broken. If it's making horrible valve noises and you're not sure, it's probably got a bent valve. Only way to know without pulling the head is to do a compression test.
You need to have someone crank the engine and check to see if all of the rocker arms are moving.
Cylinder compression test will tell you if you have a broken valve. Thats the best way. The valve might not be broken, it could just be a poor seal.
