Can you replace one valve spring?
Most times, you can get away with replacing one spring on a street engine that doesn’t see a very high rev point. If you break a second one, it’s time to think about replacing the whole set.
What precautions should you take when replacing a broken valve spring?
DO NOT MODIFY YOUR VALVE SPRINGS IN ANY WAY TO FIT YOUR ENGINE. Never place your valve springs in a vise, grab them with pliers, or hit them with a hammer as this will damage the surface of the spring and possibly cause the spring to fail. Handle the springs as little as possible to prevent damage or dropping.
How much does it cost to replace a valve spring?
The cost of this replacement job will be between $900 and $1,800, depending on the make and model of your vehicle. The process of replacing valve seals involves disassembling the entire engine until you can reach the valve spring. Remove the cylinder head cover, the spark plugs, pushrods, and rocker arms.
When should a valve spring be replaced?
By the time original equipment valve springs have 100,000 or more miles on them, they have probably lost up to 10% or more of the tension they had when they were new. Most engine experts recommend replacing valve springs that have lost 10 percent or more of their original tension.
How long does it take to replace valve springs?
The labor to pull the exhaust, valve covers, swap the springs, retainers, seals and locks, adjust the valves and replace the covers and exhaust should run about 5-6 hours per engine. Total for a twin engine should run 20-24 hours of labor, plus parts.
What does a bad valve spring look like?
Symptoms of Weak Valve Springs Weak valve springs will typically cause misfiring and a loss of power as engine speed increases. The engine may start and idle fine, or run normally up to 3500 to 4000 RPM.
What would cause a broken valve spring?
What Can Cause Valve Springs To Fail. To maintain correct valve operation at normal engine speeds; all of the valve springs must exert a certain amount of spring pressure. Consequently, too low or week valve spring pressure; may cause valves to not completely seal or float under higher (RPM).
What causes valve spring to break?