ryanchris wrote:
So i havent looked into this much past when i installed the EHM. But you are saying now with it my rear main is more likely to fail? So the choices safe for a rear main are route the ccv back into the intake ( and whatever other stuff comes with it, i guess more oil for the turbo at the least) or get a provent are it right?
Basically what you have stated is true! Several on this forum in the past have reported having the EHM mode and experiencing a blown or leaking rear or front main crankshaft oil seal.
We learned that the vacuum pump discharges directly into the engine crankcase area so with this and any additional piston ring blowby, there can be quite a bit of oily gaseous flow coming out of the CCV puck on top of the valve cover. By design, the engineers designed this system to have a slight negative pressure draw or slight vacuum on the crankcase that is provided by the low pressure suction zone that is provided by the intake boot between the turbine inlet and air filter.
So with an EH mode and if the end of the hose were to happen to freeze shut or if the hose were to get a kink in it preventing normal gaseous flow discharge, pressure inside the engine could build up and this could be detrimental to the oil seals.
We also observed that with a EHM, if you came to a stop, a lot of oily vapors could be observed by others being emitted from the vehicle.
So many, including myself have installed a Mann colesing ProVent filter to allow the CCV connection to be placed back into the intake boot as OEM. The ProVent traps and removes almost 100% of any liquids such as oil and / or condensation out of the gaseous CCV flow and collects it so it may be drained at convenient intervals such as when you perform oil changes.
This keeps oil and / or any condensation from contaminating the internals and / or collecting in the bottom of the CAC (intercooler). It also keeps the oily residue out of the intake manifold where if, hopefully not, you still have a EGR system still functional will form a sooty crusty crappy buildup mess. There are many pictures on line and in this forum showing the terrible buildup when the two are mixed together!
Note: if you read this thread from the beginning, it will give you a better understanding of many of the whys! >
viewtopic.php?f=5&t=80491
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