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What happens if my crankcase vent tube breaks

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You pollute the air.

Posted on Nov 08, 2012

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SOURCE: crankcase vent hose, broken, yellow fluid

The crankcase vent hose vents unburned fuel and oil fumes to prevent explosion in oil pan. The combination can result in a yellow or lite chocolate milk color if moisture is also present. These hoses harden over time due to the heat of these fumes and engine heat much like your vacuum hoses that harden.

Posted on Oct 16, 2009

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Locate pcv valve.pulled throtle body nothing or valve covers


Crankcase ventilation system is used to consume crankcase vapors created during the combustion process instead of venting them to the atmosphere.
Fresh air is supplied through a filter to the crankcase, the crankcase mixes the fresh air with the blow-by gases and then passed through a positive crankcase ventilation (PCV) orificed tube into the intake manifold.
The PCV orificed tube restricts the flow rate of the blow-by gases using a 3 mm (0.118 in) (a) orifice located at the end of the tube. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the throttle body in order to be consumed by normal combustion. Positive Crankcase Ventilation Hose/Pipe/Tube Replacement
Remove the two nuts (2) from the fuel injector sight shield (1).
Lift the sight shield (1) from the front and pull forward to disengage the rear tab from the bracket.
Disconnect the PCV fresh air tube from the left camshaft cover.
Remove the PCV fresh air tube from the throttle body.
Remove the drive belt. Refer to Drive Belt Replacement .
Remove the power steering pump retaining bolt.
With the hoses still attached, Carefully position aside the power steering pump.
Remove the retaining clip securing the PCV dirty air tube.
Disconnect the PCV dirty air tube from the PCV orificed tube.
Remove the PCV dirty air tube from the intake manifold.

Feb 25, 2016 | 2004 Cadillac Seville

1 Answer

How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

Nov 29, 2015 | Cars & Trucks

2 Answers

My engine is breathing badly from the breather pipe on top off the head and the dipstick tube


Those are usually the symptoms of blow-by. This is frequently caused by worn or broken piston rings, damaged cylinder walls, or (infrequently) a severely damaged piston. Blow -by is pressurized air from above the piston (that is, in the combustion chamber) leaking into the crankcase and escaping wherever it can; the oil fill opening, the crankcase vent air inlet, or the dipstick tube are the usual places where it is noticed. It generally indicates relatively major engine problems.

Nov 11, 2015 | Cars & Trucks

1 Answer

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

1 Answer

1992 ford f150 302 engine. Oil is leaking in to air filter which means it is coming from the air intake from the engine. Air filter is soaked and dripping to the ground. Any ideas on what is might be??


It is more likely that the oil is coming into the air cleaner by way of the CrankCase Vent.
There should be a tube that goes from one of the Valve Covers directly to the Air Cleaner.

Inside the AirCleaner Housing, there is the Air Filter, but there should also be a much smaller filter, sort of held in a little box, where the tube from the valve cover comes in.

This condition usually manifests when the vehicle has very high miles. It is caused by excessive BlowBy in the cylinders to the CrankCase. It will help to Change the Positive CrankCase Ventilation Valve. If it is plugged, it will make the situation worse. So, get a new PVC valve, and that is about all you can do, except to keep the air cleaner new, and the oil topped off.

Jun 25, 2011 | 1992 Ford F150 SuperCab

1 Answer

Pulling a code of 2072 any ideas? 2005 f150


Throttle Actuator Control System - Ice Breakage

Description: This DTC only identifies that the strategy has carried out several open and close cycles to remove potential ice build up. The DTC does not imply any system concerns, only that the mode has occurred, and that mode may be causing a long start time.
Possible Causes: Ice or oil in the induction system could be the result of a positive crankcase ventilation (PCV) system concern

Diagnostic Aids: Check the PCV system for evidence of water or ice. Disconnect the air induction fresh air plenum from the throttle body. Check for water or oily residue at the PCV fresh air port. Disconnect the tube at the valve cover and check the tube for ice obstruction/ice. Start the engine and, to check the PCV system, place a piece of cardboard on the crankcase vent in the rocker cover. If the cardboard is held on the crankcase vent and fumes are not exiting, reconnect the tube to the valve cover and the air induction port. If the test passes, the PCV system is OK. If the cardboard is not held in place, turn off the engine and check the PCV valve side of the system for ice or obstruction and repair as necessary. If no obstruction is found there, isolate and repair any obstruction in the intake manifold connection. If no obstruction is found there, make sure the PCV coolant heater is functional and repair as necessary. If no concern is present, make sure the PCV valve is allowing the proper vacuum flow and repair as necessary.

Jan 04, 2010 | 2005 Ford F-150

1 Answer

Crankcase vent hose, broken, yellow fluid


The crankcase vent hose vents unburned fuel and oil fumes to prevent explosion in oil pan. The combination can result in a yellow or lite chocolate milk color if moisture is also present. These hoses harden over time due to the heat of these fumes and engine heat much like your vacuum hoses that harden.

Oct 16, 2009 | 1995 Volkswagen Golf

1 Answer

Location fo pcv valve on 2001 ford ranger 4 cyclinder 2.3


I think it is in the valve cover. see illustrations from shop manual.



Positive Crankcase Ventilation System Overview The Positive Crankcase Ventilation (PCV) System (Figure 132)cycles crankcase gases back through the engine where they are burned. The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV valve should be mounted in a vertical position. On some applications, the PCV system is connected to the evaporative emission system (refer to the VECI decal). located on the underside of the hood or on the radiator cooling fan shroud.

crankcase ventilation tube
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  1. Remove the positive crankcase vent (PCV) hose from the clips.
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Apr 17, 2009 | 2001 Ford Ranger Regular Cab

1 Answer

Turbo control/control limit below minmal level jetta 2000 tdi


This happens to almost every TDI. On top of the valve cover there's a puck-shaped device with a 90 degree plastic tube connected to the intake. This is your crankcase vent... and your culprit. I fixed mine using heater hose. For detailed instructions visit TDIclub.com- a must for every TDI owner

Apr 07, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

Don't know were a pipe goes from air filter to moter


u mean the bellows tube ? or the crankcase vent tube on the bellows which ?

Jul 31, 2008 | 1997 Chevrolet Venture

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