Can you reuse intake valves?
Valve & Guide Replacement Options Some engine rebuilders will reuse the intake valves but replace the exhaust valves (because the exhaust valves run hotter and are more vulnerable to failure if reused). If a valve or whole set of valves needs to be replaced, what are your options?
How do you unstick an intake valve?
Hit the valve with a brass hammer, gently, trying to close it — exhaust valves always stick in the open position. This works well, but slowly. It could take days, maybe a week or longer. Keep soaking, tapping, and hitting until the valve breaks loose.
What causes intake valves to stick?
What makes valves stick? Heat is the primary cause of valve sticking. High temperaturesin the exhaust valve guide oxidizes oil and forms carbon depositson the valve guide, and these deposits can cause the valve tostick.
How do I know if my intake valve is stuck?
A stuck exhaust valve in the closed position produces extreme cylinder temperatures. Listen for a pinging or rattling engine noise, in association with pre-ignition (after-burning of fuel). Hot spots on the valve face and piston top cause this type of noise.
How do you fix a stuck intake valve?
You can try tapping lightly on the top of the valve and sometimes the spring will pop it back up if the springs appear ok………. HOWEVER DO NOT RUN THE ENGINE AFTERWARDS……… Pull it apart. Once the valve or head is bent and even if you get it back straight it can and will Break and cause major damage……..
What are the signs of a stuck valve?
What are the symptoms of a stuck valve? A stuck exhaust valve in the closed position produces extreme cylinder temperatures. Listen for a pinging or rattling engine noise, in association with pre-ignition (after-burning of fuel). Hot spots on the valve face and piston top cause this type of noise.
What should I do if I need to replace an intake valve?
Instal the valve stem seals fisrt (very careful not to damage any of them, best to buy a few extras just in case). Put motor oil on the valve stems before you put it back in and use a dab of grease to hold the keeper in place while you release the valve spring compressor.
What happens when you replace a valve in an engine?
Replacing a broken valve, for example, won’t fix the engine if the underlying cause is misalignment between the valve guide and seat. Unless the misalignment is corrected, the new valve will fail prematurely as flexing causes it to fatigue and eventually break.
How do you replace the valve covers on a car?
Put the valves back into their proper seats, using new valve stem seals. Put the head back on the engine and attach everything but the valve covers. Refer to your vehicle service manual for the next step. You will need to adjust your rockers with the valve covers off and the engine running.
When to replace the idle air control valve?
Start the engine and rev and hold to 1,500 to 2,000 rpm; until no white smoke is coming out of the exhaust pipe. If the idle speed still surges after this, the (IAC) valve is defective and needs to be replaced.