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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 02-02-2012, 09:32 PM   #1 (permalink)
chevydmax04
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PCV reroute over hyped?

After reading all the threads on here about the PCV reroute and the horror stories of all the oil be blown into the intercool, I decided that I should install this on my 07 LBZ with 193,000 miles.

So I ordered the $118 version from All Seasons Diesel and Installed it today. It went in just as easy as can be, took me 20 minutes. So as I was doing it I disconnected the intercooler pipe at the boot from the turbo and ran my finger in there. There was a light oil film, but nothing like what I was expecting from others have said they found. The inside of the PCV bridge I removed had oil in it, but again not the gobs I was expecting.

So I don't know if I will get the benefits mentioned by others but non the less it is installed and it can't hurt anything.

Has anyone else that installed one of these bypasses seen similar results?
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Old 02-02-2012, 11:50 PM   #2 (permalink)
pooch
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all trucks are different. mine has a small build up around the turbo outlet. not lots but its there.
i worked on a truck acouple days ago that there was enough oil built up around the intercooler inlet that it was forming drips.
but i think the big thing is keeping it out of the motor. Oil + hot valves = Carbon build ups and that can cause a valve to stick . Had this happen last week to a guys truck. he was lucky as the valve touched the piston, but never broke off.
Mine will get done when i do my EGR delete and BatMo wheel.
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Old 02-03-2012, 11:58 PM   #3 (permalink)
Stevejr
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If I had to guess I would think the more blowby you have the more oil and such will be in there. So a truck that has been turned up (black smoke) would be adding soot on top of the oil that is normally sucked back threw the engine. That engine will also have more crank case pressure to vent so more oil. Or a truck that has been abused with scared cylinder walls will have more blowby too.
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Old 02-04-2012, 12:28 AM   #4 (permalink)
dozerboy
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IMO its kind of a wast of time and blocking the EGR is much more important.
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Old 02-05-2012, 11:41 AM   #5 (permalink)
IGO1320
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Quote:
Originally Posted by dozerboy View Post
IMO its kind of a wast of time and blocking the EGR is much more important.
X2. I started a thread a couple of years ago called "Stirring the Pot" about not needing to re-route (disconnect) the PCV system. I have 153K on my 06 now and have no problems with oil in the intercooler or passing through the turbo. PCV actually helps keep moisture out of the crankcase by creating a positive ventilation/air flow. If the boost has been turned way up on your truck you may need more crankase ventilation than stock but most trucks don't benefit from removing the stock system in my honest opinion. A slight improvement of ring seal is also a benefit to leaving the stock system in place. If you want to change the PCV system then add a vacuum pump and regulate it with a valve, of coarse that will require periodic cleaning of the system but that is easy and quick to accomplish. That being said to each their own, your truck do as you wish.
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Old 02-05-2012, 11:48 AM   #6 (permalink)
tennykimble
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Quote:
Originally Posted by IGO1320 View Post
X2. If you want to change the PCV system then add a vacuum pump and regulate it with a valve, of coarse that will require periodic cleaning of the system but that is easy and quick to accomplish. That being said to each their own, your truck do as you wish.
what about one of those vaccume things they use to put on the old car headders? that used a veturi to help "suck" out the crank case fumes?
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Old 02-05-2012, 12:03 PM   #7 (permalink)
tennykimble
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like this
Attached Thumbnails
PCV reroute over hyped?-headders.jpg   PCV reroute over hyped?-headders-2.jpg  
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2006 chevy, lbz, Ls, black, ext cab, long bed, 4x4,
cat nictane filter setup, 4" mbrp exhaust, cat mudflaps, b&w gooseneck hitch, pridigy brake controller, westin stainless stepbars, PERMATECH spray in bed liner.
1969 chevelle, small block, m22 rock crusher,
355 12 bolt eaton posi, new rear tires

Last edited by tennykimble; 02-05-2012 at 12:06 PM.
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Old 02-05-2012, 11:14 PM   #8 (permalink)
clone
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Quote:
Originally Posted by IGO1320 View Post
X2. I started a thread a couple of years ago called "Stirring the Pot" about not needing to re-route (disconnect) the PCV system. I have 153K on my 06 now and have no problems with oil in the intercooler or passing through the turbo. PCV actually helps keep moisture out of the crankcase by creating a positive ventilation/air flow. If the boost has been turned way up on your truck you may need more crankase ventilation than stock but most trucks don't benefit from removing the stock system in my honest opinion. A slight improvement of ring seal is also a benefit to leaving the stock system in place. If you want to change the PCV system then add a vacuum pump and regulate it with a valve, of coarse that will require periodic cleaning of the system but that is easy and quick to accomplish. That being said to each their own, your truck do as you wish.
Agreed 100%

Venting the oil system to atmosphere is taking a step back in time when engines didn't last as long.
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Old 02-06-2012, 12:27 AM   #9 (permalink)
Stevejr
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Quote:
Originally Posted by clone View Post
Agreed 100%

Venting the oil system to atmosphere is taking a step back in time when engines didn't last as long.
I don't knowif I would go that far. Your old big rigs were vented to atmosphere and they lasted. Don't get me wrong I don't see it being that important either. I just wouldn't go as far as to say the ones that were like that before didn't last.
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Old 02-06-2012, 12:37 AM   #10 (permalink)
chevydmax04
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so am I better off reinstalling the stock PCV system?
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2007 Silverado 2500HD Classic Crewcab
6.6 LBZ
312,000+ miles
PCV reroute installed, Resonator Blocked off
Kitty on a warm shelf, Muffler delete kit installed
ECM custom programed by Kennedy Diesel

2005 Silverado LT 2500HD Crewcab
6.6 LLY 115,000 miles
Bone stock
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