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Crankcase pressure causing oil to come through breather hoses has the one way valve fitted this caused oil tank to pressurise

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Needs piston rings at least!

Posted on Aug 01, 2009


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What causes excessive crankcase vaccum, besides pcv. Pcv confirmed OK and functioning, all vacuum lines routed correctly 07 f150 5.4 3 valve

I can only think there is a fault somewhere in the pcv system that has somehow been overlooked.

The vacuum part of the pvc system provides the motive power for the flow of clean fresh air through the crankcase and into the inlet manifold via two routes, taking with it the various crankcase emissions to be burned up during the combustion process.

At idle and low revs and other times when manifold depression is high, such as during overrun, crankcase emissions tend to be drawn through the pcv valve directly into the manifold and at other times, when engine speed and load increases the venting increasingly takes place through a second vent into the air cleaner or intake. At low speed, etc. the second vent becomes the supply of clean fresh air for the crankcase.

In the early days of the pcv system some engines had fresh air supplied via a filter fitted to the crankcase and others used a vented oil filler cap. A few engines had no air inlet at all and the manifold was simply connected directly through a length of half-inch hose to the valve cover. Those engines almost never leaked oil...
For a few years BMC used a complicated vacuum regulator valve mounted on the crankcase and again a large bore hose to the manifold.

Since those days most manufacturers have settled on one of two systems using either a pcv valve or a small air bleed into the manifold to provide the motive power for the ventilation of the crankcase. Mostly there is a flame or spark arrestor/oil mist trap in the breather that sometimes becomes blocked and causes trouble, though the trouble is usually the opposite of too much vacuum.

I suggest you go back to the drawing board and recheck everything. During a service I usually test the breather by putting the compressed air blow-gun down the dipstick tube and sealing it with a cloth. If the crankcase breather is clear and working properly no pressure will build up inside the engine.
Obviously some caution is needed to avoid blowing out seals and gaskets if the breather is found to be inadequate.

Aug 08, 2015 | Cars & Trucks

2 Answers

Pressurized crankcase ?

Yes, more than likely the crankcase is being pressurized.

The usual cause is worn piston rings/bores. As the piston moves up on the compression stroke the air/gases are forced downwards into the crankcase. These pressurized gases try and escape to the atmosphere any way they can - either from the rocker cover, the oil-dipstick tube or through the rubber seal on the oil filter.

If there's an 'oil breather' on your engine, try cleaning it out. But .. the usual cause is a worn engine

Dec 05, 2013 | kawasaki Motorcycles

1 Answer

OIL leaking from my breather hose on top of the crankcase on my ttr 125

Hi, Anonymous oil level readings are taken when the engine has reached normal operating temperature and the usual suspects are:
1. Overfilled oil tank dipstick reading should at or below full.
2. If the sight glass is full you are running to much oil.
3. Excessive blowby caused by worn out piston rings.
4. Piston rings never properly seated.
5. Faulty breather valve or system.
6. Pinched or clogged breather line/hose.
7. Clogged or failed oil filter.
8. Contaminated oil dirt-rust-water etc.
9. Excessive oil foaming.
10. Wrong oil type not designed for your bike.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a wonderful day.
Spitten Out Oil
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha
YAMAHA TT R110E Owner Manual

Apr 07, 2012 | 2007 Yamaha TTR 125 LE

1 Answer

77 shovelhead w joe hunt mag and s&s oil pump everything is great except after about 20 mins of riding oil start coming out of gasket all around cam cover and mag assembly dont know what would cause...

There ae a number of things it could be. What it sounds like to me is that the oil is not being pumped back into the oil tank and is collecting in the cam chest. It should be blowing out of your crankcase breather tube as well if your crankcase breather tube is open. Behind the oil pump, there are three holes. One is behind and above the oil pump. This is where the breather tube from your oil tank and the primary comes into the engine. The hole directly behind the oil pump in the middle is the oil return line from the very back end of the primary where the oil from the primary is recirculated back into the engine. The bottom hole behind the oil pump is the crankcase breather. It should have a hose that runs back around behind the transmission and just dead ends in a bracket pointed towards the final drive chain. This hose should be open to vent the crankcase pressure. Have you checked to see if oil is being pumped back into the oil tank? If not, the scavenge gears of the oil pump may not be pumping the oil out of the engine and back to the tank. If this is the problem, you may not have the drive key properly installed in the scavenge gears of the oil pump. Still, oil should be pouring out of the crankcase breather hole. But, this is what it sounds like it's doing to me. The oil is building up in the cam chest for some reason.

Good Luck

Sep 06, 2011 | Harley Davidson FXDWGI Dyna Wide Glide...

1 Answer

14.5 hp Briggs and Stratton shooting oil and gas back thru the carb.


There is a little breather tucked in behind the carby that is held on by 2 little 5/16th screws, normally when that is passing it is due to the crankcase is pressurising it could be a couple of things could be the rings worn out causing blowby back into your crankcase or a valve timing issue where the pressure is being released at the wrong time...

either way you will probably require a small engine mechanic to attend to it

Aug 01, 2011 | Garden

1 Answer

What could cause excessive oil pressure in the oil tank of an 1988 evo, plug blows out of oil tank, when loose plug is left in oil weeps from tank and caskets have started to leak. I have changed the...

Check your crankcase breather hose. On the '88 model, it originally came from way down low behing the oil pump up to the backside of the air filter plate. If the bike was purchased used, the original owner may have rerouted the hose in order to avoid oil getting into the air filter. Find the crankcase breather hose and check to see if it has been plugged by something or has become crimped.

I'm confused by the term "breather valve". I don't know of a breather valve on the engine. If you mean the "breather gear" in the cam chest, this is good as the originals were made of plastic. These would break a tooth off the gear and quit turning. Usually the broken tooth would lock up the oil pump and indicate a problem in the area. However I have seen on occasions that the oil pump was not locked up by the broken tooth and the engine would build up too much pressure inside. I've seen the pushrod tubes start to leak because of this. If I have misunderstood and you have not pulled the "nosecone" on your engine to check the breather gear, that could be your problem as well.

But, do not pull the nose cone unless you know what you're doing. I've fixed several bikes because the owner went to check the breather gear and didn't know what all was involved in doing this. The nosecone would come off about a quarter inch and hang up, would come the rest of the way off and wouldn't go back on either. If you need specific instructions on how to take the "nosecone" off, repost and I'll tell you how to do it. You'll need a pair of tappet block pins to do the job.

Good Luck

Nov 16, 2010 | Harley Davidson FXST - FXSTI Softail...

1 Answer

I have a 1989 fzx 750 and there is oil leaking through the alternator,,any ideas,,also is there a breather hose on the engine thats supposed to be releasing little bits of smoke ??

Sounds like you have too much crankcase pressure.
That may be caused by excessively worn rings or valve guides, a hole in the top of a piston, or a crack between a cylinder wall and the crankcase.
All of which are pretty serious. The leak at the alternator is just a blown seal but the crankcase pressure must have been high for it to blow. first, carefully inspect the breather hoses from the crankcase and the cam cover to atmosphere. if they are kinked or plugged, that will cause the symptoms you describe. On some bikes there is a hose from the crankcase to the intake box. Be sure this is not blockes. Some bikes have a PCV valve, check that.
good luck.

Jun 16, 2009 | 1989 Yamaha FZX 750

1 Answer


Many craftsman compressor are built by champbell hausfeld using a dry type of cylinder and piston (no oil, no crankcase). If dry type, check for worn cylinder and piston ring. Pieces of the vinyl ring can jamb between the reed valves in the head causing air to escape from the intake. If your compressor has a crankcase and oil, check for broken reed valves in head. Spray soap solution on hoses, checkvalve, drainvalve, and fittings to check for leaks. Most likely problem is reed valves broken or open. Parts are available from sears or match parts to enjoy

Nov 26, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

7 Answers

Oil blow out the breather

This is a common problem on all sportsters, they have an oil blow by that dumps it into the air filter. I have found that if I run about a half quart low the problem goes away.

Nov 10, 2008 | 2000 Harley Davidson XL 1200 C Sportster...

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