Crankcase Vent Filter Repairs In Cars

What is this Crankcase Vent Filter?

The most frequent application for the crankcase vent filter is presently on high performance auto engines such as race vehicles, though it is extensively used on older models of cars as well. Inside the engine are small quantities of combustion gases push by the piston in the cylinder and then enter the crankcase, or the bottom end of the engine. These gases produce a positive pressure inside the crankcase, which needs ventilation. Positive crankcase pressure denies the engine of power as the pistons have to fight against that pressure when running each down stroke.

A breather tube is linked at the top of the crankcase in the engine block that then releases the positive pressure into the environment or into the intake to cleanly burn prior to being introduced into the atmosphere. The breather tube has a port or elbow at some point along its route where the crankcase vent filter is linked. The crankcase vent filter lets excess pressure to push out into the environment without taking oil particles or other messy contaminants with the gases. It equally stops any debris or dirt from going into the crankcase if there is a situation where negative pressure happens, such as engine cooldown. If the crankcase vent filter is plugged, the excess positive pressure inside the crankcase can blow out engine oil seals. If the crankcase vent filter is not in place, dirt can enter the crankcase and plug oil galleries or contaminate the oil, which can create lasting engine damage.

Facts to Note:

The crankcase vent filter functions opposite to how other filters operate. Its main duty is to stop contaminants in the engine from going into the atmosphere, while most other filters stops contaminants from entering the engine.

How to Fix:

If it is confirmed that the crankcase vent filter requires replacement. The air filter housing should then be opened.

The faulty crankcase vent filter is then removed by disconnecting the vent hose and taking out the clip.

The new crankcase vent filter is mounted and secured with a clip. The vent hose is then attached.

The air cleaner housing is then closed. The crankcase vent filter is then tested for operation.

The car should be road tested to ensure proper operation of the crankcase vent filter.

The crankcase vent filter will suddenly get plugged with oil that is conveyed by the exiting vapor. It should be checked whenever the engine air filter is swapped, and should be replaced at least as often as the spark plugs. If you experience signs that may be associated to the crankcase vent filter, have one of your expert technicians diagnose and change the vent filter.

What are common signs that indicate you may need to change the Crankcase Vent Filter:

Oil on the engine

Plugged filter causing engine seals to leak

Decrease in engine performance

Importance of this service:

When it is that crankcase vent filter is actually plugged, engine oil will leak when seals get pushed out. If the vent filter is missing or broken, contaminants can penetrate the crankcase. If the vent filter is not in position, an oily mess can happen under your hood. It is wise to change the crankcase vent filter as soon as required.