930 and Oil in the Intake

frednhremax · 10-02-2006, 12:28 PM

The problem: There is oil in my stock air cleaner housing and is be cycled thru my engine.

The is oil being sucked or pushed into the air filter housing. By which hose I don't know. There is oil in both the cloth emissions hose and the oil tank breather. The cone in the oil hose is missing, did it have one?.

1. The oil reads nothing on the gauge at 180 degrees and shows about 1/3 200 plus degrees. On the dip stick it is on the bottom third when hot. Until the engine starts burning it. There isn't too much oil in the oil tank.

2. The case seems to have a lot of pressure out of the oil tank breather hose, but nothing gives me any signs of bad rings, pistons etc. The engine was rebuilt about 4k miles ago, ran very good until now. Current leak down is perfect and similar in all. She runs smooth as can be and has plenty of power.

3. The engine has been fitted with a k27 when rebuilt.

4. BB exhaust.

5. Most emissions have been removed, pump and piping.

I believe the problem is that some of the emissions has been removed, while some is still there. I can remove all with the proper advise!!
Thanks

David · David's Garage

You say there's a lot of pressure out the oil tank breather hose, but no sign of bad rings. What else would it be?

frednhremax · 10-02-2006, 04:24 PM

The car runs so smooth it is sick, piles of power etc. But after about 100 miles oil starts to drip from stock air housing down and ends up on pass headers.
I think it is something related to emission stuff being removed but not completly.
Does anyone know if I can replumb the vents with hoses and kn filters? Also remove the other emision stuff, canisters in wheelwell and under hood?

DW SD · 10-02-2006, 04:28 PM

Maybe the oil level is too full? Are you sure you have the right dipstick?

I have a little film oil in my intake, more so than I'd like. I'm considering removing the oil tank breather line and simply attaching to a catch can, which I could drain, as necessary.
Maybe someone can show some catch can setups?
AND provide vacuum / oil breather hose diagrams / routing?

Doug

frednhremax · 10-02-2006, 04:36 PM

The car runs so smooth it is sick, piles of power etc. But after about 100 miles oil starts to drip from stock air housing down and ends up on pass headers.
I think it is something related to emission stuff being removed but not completly.
Does anyone know if I can replumb the vents with hoses and kn filters? Also remove the other emision stuff, canisters in wheelwell and under hood?

DW SD · 10-02-2006, 04:40 PM

Can you offer a diagram as to how the oil tank vent is plumbed currently?

Doug

frednhremax · 10-02-2006, 04:49 PM

Too much oil no way. Only put 10 quarts in. The level on the dash gauge doesnt read at 180 but starts to climb at about 200, at idle. The dip stick reads bottom 1/4 at temp and is the correct part.
I believe missing emision stuff is causing the problem, the previous owner had the engine rebuilt 4k ago and removed the air pump and head air tubes, but other items are still there. I think something more needs to be removed or modified.

Any help is greatly appreciated.

DW SD · 10-02-2006, 04:54 PM

Can you offer a diagram as to how the oil tank vent is plumbed currently?

Doug

__________________

frednhremax · 10-02-2006, 05:08 PM

It is stock in the air cleaner area.
Black tank bottom hose to hose on bottom. The y hose connects to the intake housing, oil tank vent on the filler tube and black canister. I have oil coming out of the cloth emision hose that mounts lower on the intake housing, that cloth hose goes to the canister in the wheel well. My question if no air pump off the oil pump, what does that effect. More pressure from to the emision system that allows oil to migrate to black canister and ultimatly to the intake housing?

There is a second connection to the oil tank, it is capped. What did go there? Not this model?

David · David's Garage

I think from the tank you could have just the line to the engine case and a line to the intake. I've removed all my emissions stuff so I can't tell where the charcoal canister fits in the mix.

William930t · 10-02-2006, 05:26 PM

"You say there's a lot of pressure out the oil tank breather hose, but no sign of bad rings. What else would it be?"

Is there a connection between higher oil pressure and worn/bad rings?

David · David's Garage

Quote:

Originally posted by William930t
"You say there's a lot of pressure out the oil tank breather hose, but no sign of bad rings. What else would it be?"

Is there a connection between higher oil pressure and worn/bad rings?

It's not higher oil pressure, it's blowby air going into the oil tank. If the rings are not sealing, the combustion gases go past the rings, into the crank case, and through the line at the top of the engine case and into the oil tank. Then they are vented to the intake probably carrying some oil with it.

RarlyL8 · RarlyL8's Garage

Bad rings cause blow-by of compression gas into the crank case which would in turn presurize the oil reservoir.

What you are sescribing sounds like an overfilled oil tank or bad rings.
Could you possibly have a restriction in your oil return line?

AFJuvat · 10-02-2006, 05:42 PM

Please state the year of your car.

There should be a total of four oil lines going to the oil tank (bottom) - The "S" hose to feed oil to the tank, the oil return line from the turbo scavenge pump (routed over transmission hump from drivers side rear camshaft), oil seperator line (from oil seperator in engine compartment, top, and finally oil return line from thermostat housing (passenger side rear wheel-well).

Look on the passenger side engine tin and see if there is an oil hose coming through the tin to directly to the oil tank. If there isn't then the oil seperator is not draining and thus oil is being sucked into the air cleaner housing.

The air pump will have no effect on the problem you are describing. The air pump injects air into the exhaust stream only.

There are two black canisters - one is the oil seperator, which is somewhat funnel shaped and located in the engine compartment and has three hoses attached to it.

The cylindrical canister in the wheel well is the carbon canister for fuel vapor recovery.

AFJ

AFJuvat · 10-02-2006, 05:43 PM

If you have a digital camera, please snap some photos of the area and post them.

AFJ

frednhremax · 10-02-2006, 05:44 PM

can the black charcoal canister go bad? I can buy a replacement?

Leak down on the engine was great. My mech said he thought the pressure was a lot, but said he hadn't felt pressure from a 930 in years so it might be ok; couldn't say for sure. But leak down points to another issue, engine is very quiet and smooth!!!

frednhremax · 10-02-2006, 05:48 PM

Photos would of been great, but I've got apart, my bad!!

No air pump on the emission system, can this cause a lack of back or balancing presure to keep the oil vapor from making it to the intake area?

Also, I can't find the cone in line speerator people speak about. Where does that go? and where can I get one?

frednhremax · 10-02-2006, 05:49 PM

1988 930