Question about 2001 Yamaha YZF-R1

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Would a hole in the crank case cause to much crankcase pressure

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Posted on Nov 13, 2014


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Watt is a cpv valve on aford f250 engine

PCV - positive crankcase ventilation.

one way passage for gases to escape in a controlled manner from the crankcase of an internal combustion engine.
This is necessary because internal combustion inevitably involves a small but continual amount of blow-by, which occurs when some of the gases from the combustion leak past the piston rings (that is, blow by them) to end up inside the crankcase, causing pressure to build up in the crank case. For control of the pressure inside it, a PCV is used to vent the crank case


Hope this is helpful :-)


Feb 19, 2015 | Ford F-250 Cars & Trucks

1 Answer

Would a hole in the crank case cover cause to much crankcase pressure

No, it would have the opposite effect. you would lose pressure that normally routes to the pcv hose.

Nov 13, 2014 | 2001 Yamaha YZF-R1

2 Answers

Excessive crank case pressure. engine built up pressure and blew valve cover almost all the way off, cracking it in several places

Your engine should have a Positive Crankcase Ventilation or PCV valve on it to prevent this type of thing from happening. While I am not familiar with you engine, you should be able to locate a rubber line running from your valve cover to the air intake system. It may be part of the oil fill cap or a separate valve. It may be a separate piece then you can test it by shaking it. Inside is a metal stopper that should flop back and forth very easily when shaken. This is probably plugged. They can be washed out with gas but it is best to replace them on a regular basis, as you can see.

Dec 05, 2013 | 2004 Ford Freestar

1 Answer

The oil dip-stick is blown out of its seat when the compressor runs

Without knowing what make or model you have, check the following:

1. Some, not all, compressor dip sticks have venting holes for the crankcase. If the vent holes are plugged or the check ball is stuck the dip stick will get forced out when the piston comes down.
2. Make sure the oil level is where it's supposed to be. Too much oil in the crankcase will cause the motor to work harder and the excess oil being splashed around the crank case can overwhelm the vents in the case or dip stick and again blow the dip stick out.
3. Worst case, you have worn or broken rings on the piston(s), a hole in a piston or a badly scored cylinder(s) and air is leaking past the piston and creating pressure in the crank case and blowing the dip stick out.

Jan 26, 2011 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Oil in air filter wot causes this car in qustion is a jag xj8

This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.

Usually there is minimal oil that gets back into the air cleaner.

So, when somthing goes wrong, like excessive blow by, for example, the crankcase pressure overcomes the PCV valve and intake of fumes capability, and oily starts showing up in the air filter.

Investigate the crankcase pressure and PCV system.

Oct 14, 2010 | 1998 Jaguar XJ8L

1 Answer

When my gl1500 gets warmed up, motor oil leaks out of a hose directly underneath the crank case. how do i stop this oil leak?

too much crankcase pressure can be caused by oil level to high, or worn piston oil rings, thus drawing pressure from the combustion chamber into the crankcase. If your oil level was to high, then that is most likely the cause of your problem.

May 23, 2010 | 1988 Honda GL 1500 Gold Wing

3 Answers

Oil blow back from out of the dip stick, what may be causing this and how to resolve the problem.

Time has come to retire this vehicle to the recycle plant and get yourself a nice new SMALL car thats fuel efficient.Most obvious cause is worn pistons and rings

Oct 23, 2009 | 1989 GMC Suburban

1 Answer

Crank bearing cap blew out on Porter cable air compressor

Your compressor is sold under various part #s depending on brand name. The link below is the breakdown for ac-0171. You will notice that there is no vent to release internal pressure. Most brands have a filler/dipstick which is also a vent. As the compressor wears there is a normal increase in crank pressure caused by pressure passing thru the rings. I have seen home made vents installed on the bearing cap. If you are creative you can make one yourself using the same cap or a metal cap (axel bearing cap) that fits the opening. A crankcase vent is a very simple device. A small hole to atmosphere with a bit of oil resistant foam behind to prevent oil from being blown out the hole. Works best when there is a vent tube about a couple of inches long to catch any oil and allowing it to run back down into crank. Remember that there is oil sloshing around inside the pump. Examine several brands of compressors for vent and try to recreate that on yours. One thing in common about vents is that they are usually located pretty high up above the crankshaft. You could also try lowering the cut-out pressure on your compressor to reduce back pressure. Good Luck on your repair.

Apr 23, 2009 | Porter Cable Air Tools & Compressors

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