How does a crankcase pressure control system work?
The scavenge side of the pump pulls oil out of the pan and back to the tank or reservoir. The pressure side of the system then pumps oil into the engine. A typical setup will have one pressure stage and multiple scavenge stages.
What happens when crankcase pressure is too high?
Improperly gapped rings can permit blow-by and oil contamination. Detonation can occur. Compression can be lost. Gaskets can be bubbled, burned or blown out. And of course, water can penetrate into the oil, or worse, the cylinders and hydrolock the engine. Not nearly as catastrophic but equally as terminal is excessive blow-by.
What happens when the crankcase is entered into the engine?
Once entered into the crankcase, the atmospheric pressure begins to build. This superheats the air and oil – far faster than what the engine was designed to withhold, consequently boiling the oil into a miasma of oil mist and fuel vapor.
What happens when fuel is left untreated on a crankcase?
If left untreated, unspent fuel can break down the oil’s protective attributes on sensitive bearings and rings, causing excessive heat and accelerated wear.
What causes the fuel pump to stop working?
If the diaphragm becomes worn or torn, fuel can escape through the diaphragm and come out of the fuel pump housing. Eventually, these will fail completely, causing the engine to stop running. As the fuel pump produces less pressure, the engine fails to operate.
Can a bad outboard fuel pump cause a hard start?
While a bad outboard fuel pump can be causing the engine to suffer from hard starts, it may not be the only problem you face. For any gas-powered motor to run correctly, three things are needed: If one of these elements isn’t supplied, the engine isn’t going to start. Most problems are going to be related to one of these three issues.
How can I find out if my fuel pump is bad?
Screw your compression gauge hose to the hole of the spark plug. With your hand, twist the throttle position wide open. With your other hand, pull the rope start, or turn the starter over to turn the engine over four or five times. Read the compression gauge in PSI ( pounds per square inch ).