Oil in CAC

tomasnc · **Posted:** Tue Mar 10, 2015 7:41 pm

I am in the process of get my engine opened up to do the rockers, ARP's and TB & WP

My inner cooler has a nice leak and as I was getting ready to steam clean it I picked it up and noticed a larger amount of the had collected in it.
I emptied it out and 1.5 quarts was inside it :shock:

. Is this normal ? I am replacing the rocker and doing the Weeks EGR delete.
I was expecting the elbow to be really gummed up. It was not that bad.
I'm in hopes the CAC will be something the can be repaired. The leaks are substantial. Probably one of many reasons for low power... along with shot rockers.

Thanks,

Tom

Jay ne Ohio · **Joined:** Sun Dec 12, 2010 5:49 pm **Posts:** 216

Sounds like a lot of oil. Has the turbo ever failed? A turbo failure will fill the CAC with oil.

ATXKJ · **Posted:** Tue Mar 10, 2015 8:34 pm

if you haven't fixed the Crankcase ventilation - either Elephant hose or Provent - then that's a feature - not a bug.

(my Provent collects about an oz every thousand miles - it adds up)

tomasnc · **Posted:** Tue Mar 10, 2015 8:56 pm

Jay ne Ohio wrote:

Sounds like a lot of oil. Has the turbo ever failed? A turbo failure will fill the CAC with oil.

Jay, I just installed the second turbo thinking the turbo was bad but the rockers had gone south.
I was really shocked by that amount of oil.

thermorex · **Posted:** Wed Mar 11, 2015 7:43 am

That's a lot of oil... As Jay said, I suspected a failing turbo bearing. That oil could have been in there for a while. I'd say empty it, fix your crd, fire it up, drive couple hundred miles and inspect turbo hoses for oil. You'll also need to make sure you measure exactly 6 liters of oil when you do your oil changes. Any more oil gets blown up one way or the other, I have the provent with a release valve on the drain and through the drain (not connected to the oil pan, just hanging under the jeep with the release valve in the hose) I loose anything that's over 6 liters. I assume that could be your issue too, you may have added too much oil in the engine, the dipstick is known to be inaccurate. You should pay attention since that much oil in the intercooler can cause a runaway diesel if you don't have the stock intake elbow with the "throttle" plate.

WWDiesel · **Posted:** Wed Mar 11, 2015 7:59 am

Add a ProVent! Then you can monitor and capture any oil from the CCV before it gets into the CAC. :wink:

Jay ne Ohio · **Joined:** Sun Dec 12, 2010 5:49 pm **Posts:** 216

thermorex wrote:

You'll also need to make sure you measure exactly 6 liters of oil when you do your oil changes. Any more oil gets blown up one way or the other, I have the provent with a release valve on the drain and through the drain (not connected to the oil pan, just hanging under the jeep with the release valve in the hose) I loose anything that's over 6 liters. I assume that could be your issue too, you may have added too much oil in the engine, the dipstick is known to be inaccurate.

Thermorex has a good point in the quote above. The dipstick is wrong. If you fill it to the full mark, there is an extra quart (liter) that tends to get sent into the crankcase vent which is plumbed into the intake prior to the CAC.

thermorex wrote:

You should pay attention since that much oil in the intercooler can cause a runaway diesel if you don't have the stock intake elbow with the "throttle" plate.

However, Thermorex is incorrect with the assumption that the FCV will prevent a "runaway". It has been discussed many times. There is nothing in the "software" that would engage the FCV (throttle plate) during a runaway engine. It is a great idea and I wish that someone would have thought of it when they wrote the code. The turbo failed on my "gold" colored CRD and filled the CAC with oil. But the failed turbo did not have the boost to push the oil from the CAC to the intake. However, after I replaced the turbo, the new turbo DID have enough boost to pretty much clean the CAC of oil when I fired it up for the first time. The engine rev'd to 4000 rpm and did not stop until the oil was used up. The FCV did nothing. Turning the key off did nothing (turning key off should close the FCV for a few seconds).

papaindigo · **Posted:** Wed Mar 11, 2015 10:13 am

Just to be picky liters don't equal quarts so a full fill with new filter is 6.3-6.4 qts with a stock size filter and 7 qts with an oversize filter. Mark dip stick accordingly. FYI when marking or checking be sure to allow at least 5 minutes for oil to drain back to the pan thru the tiny oil passages and to park on a flat spot; you will be amazed at how much just a small grade throws the dipstick off.

mass-hole · **Posted:** Thu Mar 12, 2015 8:41 am

That oil couldn't be from the pcv system? The f150 ecoboost Have big issues with that. They get oil, fuel, water, etc coming through.

thermorex · **Posted:** Thu Mar 12, 2015 6:39 pm

Jay ne Ohio wrote:

thermorex wrote:

You'll also need to make sure you measure exactly 6 liters of oil when you do your oil changes. Any more oil gets blown up one way or the other, I have the provent with a release valve on the drain and through the drain (not connected to the oil pan, just hanging under the jeep with the release valve in the hose) I loose anything that's over 6 liters. I assume that could be your issue too, you may have added too much oil in the engine, the dipstick is known to be inaccurate.

Thermorex has a good point in the quote above. The dipstick is wrong. If you fill it to the full mark, there is an extra quart (liter) that tends to get sent into the crankcase vent which is plumbed into the intake prior to the CAC.

thermorex wrote:

You should pay attention since that much oil in the intercooler can cause a runaway diesel if you don't have the stock intake elbow with the "throttle" plate.

However, Thermorex is incorrect with the assumption that the FCV will prevent a "runaway". It has been discussed many times. There is nothing in the "software" that would engage the FCV (throttle plate) during a runaway engine. It is a great idea and I wish that someone would have thought of it when they wrote the code. The turbo failed on my "gold" colored CRD and filled the CAC with oil. But the failed turbo did not have the boost to push the oil from the CAC to the intake. However, after I replaced the turbo, the new turbo DID have enough boost to pretty much clean the CAC of oil when I fired it up for the first time. The engine rev'd to 4000 rpm and did not stop until the oil was used up. The FCV did nothing. Turning the key off did nothing (turning key off should close the FCV for a few seconds).

Lol Jay, you're funny, thermorex is right with this and thermorex is wrong with that. What I mean is this: turning off the engine should turn off the fcv, not sure to be honest if the time it's off would be enough to kill the engine in a "serious" run away though, as the fcv closes and then opens back. But theoretically blocking the air would kill the engine and this is the purpose of the fcv, but for obvious different reasons (like make the death shutter smoother for people not used to diesels). Now, I also removed mine for weeks kit, and I'm not concerned about a runaway diesel, but the principle I highlighted (killing the air when turning off the engine by closing the fcv) is at least theoretically correct.

(edit- just read again the last part of your post, so the few secs of fcv closing was not enough to kill the engine? That's a clear proof that fcv does not help a bit... So I assumed wrong and you must be correct!)

taroo · **Joined:** Sun Apr 27, 2008 2:14 pm **Posts:** 291

papaindigo wrote:

Just to be picky liters don't equal quarts so a full fill with new filter is 6.3-6.4 qts with a stock size filter and 7 qts with an oversize filter. Mark dip stick accordingly. FYI when marking or checking be sure to allow at least 5 minutes for oil to drain back to the pan thru the tiny oil passages and to park on a flat spot; you will be amazed at how much just a small grade throws the dipstick off.

Whew..I was going to say the same. 6.4 quarts is what I fill with.

Question-isn't the Provet oil/air seperator element good for many years? Do I ever have to replace it?

Oil in CAC

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