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What cause crankcase back pressure in a four stroke outboard motor?
Wiki User
∙ 10y ago
All four-stroke engines have crankcase back pressure because gases blow by the piston rings. They used to just drill a hole in the crankcase to let it out; when the government figured out this was a major source of pollution, they required the gases be captured and burned. To make this work, the hole is fitted with a one-way check valve and a hose. The hose is routed to the air intake on the carb or fuel injection. This is called "positive crankcase ventilation" (or "PCV") because the intake system's vacuum sucks the gases out of the crankcase. The valve is there for safety reasons: if the engine backfires through the carb, the PCV valve keeps your engine from exploding - which happened before the PCV system was invented.
If you're getting back pressure, this system isn't working. And the problem's usually that the PCV valve is clogged or stuck shut. They should be replaced every year at the start of boating season, but since yours is clogged replace it now. If you pay $10 for one you went to a really expensive store.
Wiki User
∙ 10y ago
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What can high pressure cause?
It can cause stroke.
What may cause stroke?
stress and high blood pressure
What is primary cause of stroke?
Well, I'm not really sure with my answer but I think the primary cause of the stroke is the heart attack and high blood pressure.. :)
Can varapamil cause a stroke if the blood pressure is normal?
Verapamil helps lower your blood pressure. Religiously taking this drug prevent you from having stroke.
WHAT PROBLEMS DOES High blood pressure CAUSE?
It can lead to a stroke and death
What could result if you used 4 stroke outboard oil in a 2 stroke outboard mix?
It could cause engine damage. We had somebody put 10W40 4 stroke oil in the injection oil tank of a 2 stroke sea doo pwc and it ran for less than an hour before there was significant engine damage. He is now forever known as Captain 10W40.
What types of heart disease cause a weak heart and low blood pressure?
stroke
What causes pressure to come out the oil fill hole?
One possible cause is a blocked PCV (positive crankcase ventilation) valve. As your motor is running the crankcase will build with pressure and the PCV system will let the motor breathe. If the PCV valve is blocked or faulty then the motor will look to release the pressure somewhere else.
What is the purpose of a PCV valve on the 93 Acura Legend?
A PCV valve is for positive crankcase ventilation. It is to keep crankcase pressure from building up in the engine. If it does it can cause seal leakage, air filter contamination and engine blowby.
Can blow by be caused by a faulty turbo?
not really. You can get blowby in the turbo itself from high crankcase pressure, but a turbo won't cause engine blowby.
What can cause gas to get into the crankcase on a 97 Pontiac 4-cylinder fuel injected 2.2?
Possible causes of fuel in crankcase are: Leaking injector at shutdown, flooding of the engine due to hard starting, defective fuel pressure regulator. A fuel pressure check for drop of fuel pressure at shut down will verify if an injector is leaking. Get this fixed ASAP, and stop driving the car until you do. Fuel in the crankcase will cause severe engine wear and destroy this engine. Change the oil and filter if you have to drive it anywhere for repair.
Can brain damage from a stroke cause one to become schizophrenic?
Yes unfortuantly the stroke causes pressure on the brain, 1 in 4 people have a schizophrenic gene in their brain. The unrevelved gene is activated by this pressure
