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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 11-12-2009, 05:41 PM   #11 (permalink)
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I got mine at the dealership IIRC for $65, I didn't know the parts places called it a PCV at the time, doh!

2001 GMC Sierra 2500HD, EC LB, 2WD, Duramax, 30mpg highway.
1996 Chevy Silverado 2500HD, RC LB, 4x4, 14 bolt FF 3.73 posi, Suncoast 4L80E, completely custom engine, true dual 4" exhaust
1987 GMC Sierra 1500HD, RC LB, 12 bolt 3.08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. Swapping in a built TT Duramax/Allison. Looking for about 700RWHP
1995 Chevy 3500HD, RC, DRW, 13' for looong box, Dana 80 4.63 gears, double framed, 15,000 GVWR
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Originally Posted by bodis22
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Old 11-13-2009, 04:14 AM   #12 (permalink)
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The slight oil film that will form in the intake track (If your CDR is working correctly that is) is nothing more then oil mist that is sucked in by the turbocharger, and it will happen regardless of the age or condition of the CDR, it just gets worse with age lol.

That oil film is actually a good thing, think of it as "undercoating" for the intake of the engine, and it'll help prevent oxidization.

There should be no more then a "wet" look to the insides of the intake.

If you have more then that, clean the air filter (or get a new one) or replace the CDR (also called PCV as Peter has pointed out, but that is the wrong name for it)

CDR = Crankcase Depression Regulation
PCV = Positive Crankcase Ventalation

The CDR is used in mostly in turbo'd applications, (Mostly, because it is used on the N/A 6.2s) and it allows the turbo to scavenge the crankcase pressure caused by blowby, so you don't blow out your seals and also prevents the turbo from sucking up engine oil too (That's where depression regulation comes into play, it prevents excess pressure or vacuum), which would cause a run-away situation on a Diesel because it will use the oil as fuel, with no way to stop the flow of fuel. It is also an emissions control device, all those harmful vapors are recirculated into the engine to be "consumed" and disposed of in the manor they system was designed for. In other words... Don't vent the system into the atmosphere, think of your kid's kids.

PCV uses that pressure in a crankcase to vent so you don't blow seals, not much worry of sucking up oil.

Lastly, adding the CDR post turbo is a bad idea... It needs to be pre turbo, post filter. Post turbo, it kinda defeats the whole point of having it really.........

98 3/4ton 4x4 RC LB F vin L65 HO.
DSG gear set, gurdle and oil cooler, ported and half assed polished heads, HE351VE turbo, 3" downpipe, 2.25" xover, 3.5" DNA muffler and a 4" weed burner exhaust, NRK High idle switch kit and K47 relocated intake & AEM filter, Royal Purple in the trans, engine, and rear diff, 4 cobalt gauges, boost, pyro, trans temp and drive pressure. -6 CAT fuel system, Carter fuel pump. Sitting high on 35" Duratracs.
Bought it with a pooched engine and rebuilt it myself! 211,000 kms on the truck, 110,000km on the rebuild, still chuggin and still screamin.
If you're not drivin it hard, you don't deserve to drive it!

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