What does a spring tensioner do on an engine?
Spring tensioners are designed to tension automatically while the pivot design types can be adjusted manually. Both are used to keep tension on the engine serpentine belts so that they can drive the various engine accessories.
When to replace the timing belt on a water pump?
When replacing a water pump run by a timing belt, always replace the timing belt at the same time, especially if the water pump was leaking. A coolant contaminated timing belt will have a reduced service life. On the other hand, a worn out timing belt may break and damage your new water pump.
What should I do if my water pump fails?
Do not keep driving your car if your water pump fails. The worst thing for an engine is heat. Excess heat will warp internals and kill an engine. If you are overheating and have a failed water pump, pull over to the side of the road and get a tow truck. If you’re 1,000 feet away from a repair shop, fine, idle the car over to it.
What happens when a belt tensioner goes bad?
When the tensioner has an issue, it can affect the how the belts drive the pulleys which can affect the performance and functionality of the vehicle. Usually a bad or failing tensioner will produce a few symptoms that can alert the driver of a potential problem that should be serviced.
What causes a chain driven water pump to fail?
Another reason why chain-driven water pumps fail is a worn or defective tensioner and guides. Most engines use oil pressure to actuate a tensioner that puts pressure on a guide. If the tensioner fails (typically due to a lack of oil changes), the chain will move around due to centrifugal force acting on the chain.
What happens when a belt on a water pump fails?
A failed belt means a non-operational water pump, which is as catastrophic as a broken water pump. If a belt is over-tightened, it must be replaced and the tensioner reset. Otherwise, it can damage the pump’s drive pulley and lead to premature bearing and/or casting failure.
When to reinstall the timing chain on a water pump?
If you exceed 20º with the tensioner slacked, the chain could jump. When the new pump is installed, you will need to reinstall the tensioner. Turn the crankshaft pulley approximately 20° counterclockwise so that the timing chain on the timing chain tensioner side is loose, and then install the tensioner.
If the belt isn’t sufficiently snug, it should be tightened to specification, and this tightness should be checked regularly. A failed belt means a non-operational water pump, which is as catastrophic as a broken water pump. If a belt is over-tightened, it must be replaced and the tensioner reset.