Mann-Filter ProVent 100 model 3931070793 OCC

Duh, right. Brain fart.

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The carbon particles, plus the moisture, sort of “powder coat” the interior of the EGR components? The cooler in particular, would tend to condense/collect the brew; it’s design purpose is to cool it some.

 

I really like this thread!
How does the manufacturer say this valve assembly on the side of the Provent 100 functions?
Sorry if I missed the explanation. I don't see the need for this valve with an ICE.
I do see how you'd want that drain hose capped and not open to the atmosphere.

I do see the need to keep the hose runs without any 'bow' in them to allow moisture to drain to the low end of each run.
I like the idea of using insulation around the hoses to keep the innards from freezing.
BTW, what happens to the water content of an OCC when it get's really cold?

I'll be installing an OCC when I finally go for a complete EGR system cleaning.

 

Well, I'm going to add the OCC for the PCV. I just wish I could come up with a way to trap the shit from the exhaust circuit.
Also, what about the tube coming from the valve cover to the intake hose? Has anyone seen any issue here?

 

bone dry here /

 

Admittedly, I have not yet read these (only just downloaded), but there are 2 files on this website dealing with the Provent.
Under "Crankcase Ventilation Systems", the top link is specific to the 100, while the bottom link covers all of them. I am hoping to find that answer in here, but you may get to read it before me. There's also a flyer.
https://oem.mann-hummel.com/en/downloads.html#accordion-68f9393dfa-item-150dd10e43

 

As it should be when the volume of blowby gases doesn't doesn't exceed the flow rate through the PCV valve.

 

I believe the theory is, as long as the PCV valve is working and keeping the Crankcase air at a lower than ambient pressure the flow through that hose is always providing clean air to the top of the engine and the oily blow by fumes get sucked through the PCV and into the low pressure (vacuum) side of the intake manifold.

And then the theory is by condensing/trapping some of the oil/moisture in those fumes in the OCC before it gets consumed by the engine,,, maybe there will be less carbon particles in the exhaust gases, and maybe there will less carbon build up in the EGR cooler and passages.

Also there is the promise of not having pools of moisture settling out in the intake manifold after shutdown.
These pools get sucked into the engine at start up and create that horrible knocking at startup sounds.
I kind of believe that short duration knocking/hydro-locking may be the real destroyer of head gaskets.

I personally have the theory that ice can build up in the intake manifold when in very humid conditions and the car is driven at speed and the intake is much colder than the engine. (Similar to 'Carb Ice' in small airplanes.) (This is why the Throttle Body has coolant lines to keep it warm so ice can't form.)
At shut down the ice melts and a pool of water is laying in the bottom of the intake manifold.
I only had 'start up knock' once, on a previous Prius. It was on a road trip in those conditions.

But there is something to the theory that the small EGR passages in the intake manifold get clogged more on the last ports in the row, cylinders 1 and 2. And this creates uneven combustion pressures in the cylinders. But if it's so bad it gets to knocking, or whatever, why does the Knock Sensor not hear that and adjust the system accordingly?

Sorry for the long treatise on this subject.

I too am pizzed at toyota for not addressing this chronic head gasket problem.
Is there really a maintenance program that can make this engine last as long as similar engines?
Toyota could at least give recommendations if there is a chance of saving the head gasket.

 

Here's an interesting bit. I sent an email to Mobil to find out if their spin on filters had an anti drain back valve.
Mobil forwarded the email to their tech team. The email I got back (Mobil's Tech Team). Mann+Hummel, maker's of the Provent OCC, apparently make filters for Mobil.

 

I couldn't agree more. I think someone with a fancy desk should start working on a class action, as it is Toyota's failed attempt at emission control that is causing this issue.
Also, in my case, it's no longer just a head gasket.

 

Their recommendation (in a warranty extension, May of 2017) is to wait for EGR clogging code P0401, and/or cold-start shakes, then bring it into a dealership. Oh, and they add:

While the majority of vehicles will not experience this condition

(Italicized and underline, like the above)

 

Not all engines need anti-drainback valves in the filter. You can easily see the valve in filters that have it.

 

Funny. When was this written? Like in '11 or '12? Before it was obviously a common chronic problem?

 

You might consider performing a 'Piston Soak'.
This would be a perfect situation to measure if this really helps with oil consumption.
Pistons all even in the bores.
Pour X amount of the strong detergent product into each spark plug hole.
Wait a day or two for it to soak past the oil control rings and their drain hole in the pistons.
Change the oil before driving.

I have a friend with really high mileage Prii and he claims this routine definitely helps!
Lots of info and different Piston Soak products to choose from.

 

Type of detergent? do you have a link?

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Someone was inside with the engine that far apart and didn't replace the known low tension rings wow that's really interesting I don't think I could do that I'd be ordering me some aftermarket Deves rings or something . The low tension rings cannot account but for tenths of mileage or Mpg numbers . That was a big mistake on Toyotas part on an already week open deck design to skimp out on the piston rings thinking you could reduce the tension and clamping force of the ring to the cylinder wall to save me exactly what..?? Exactly this is what happens when too many people got too many irons in the fire and too much say so

 

The 2015 Prius mpg average on Fuelly dropped 0.2 compared to earlier 3rd gen years…

 

Google 'Ring Soak'.
Several products to choose from.

It will help with oil consumption. I doubt it will do much for MPG issues.

Keep in mind this is a several day affair. You want all the 'product' to soak the carbon build up in all the ring lands and escape to the oil pan through the oil drain holes in the oil control ring lands.
These holes getting clogged is part of the oil consumption problem.
It may take a few days for the product to leave the combustion chambers.