Hey,
Just purchased a 93' Chevy 2500 6.5L Turbo Diesel. Pretty happy with it so far. A suggestion was made to me to remove the PCV and put a filter on the output and let it run to the atmosphere, obviously sealing off the intake where the return line previously went. Cant find a damn thing about this online, was wondering if anyone has done this or if this can cause issues due to the lack of "vacuum" from the intake pulling off the PCV. If this all goes well when I put a straight exhaust on the truck I'm planning on running a line from the manifold where the PCV was to into the exhaust to create a vacuum so it pulls all that shitty oily water under my truck instead of under my hood. Any advice or helpful hints would be appreciated.

Thanks!
Josh



93' Chevy 2500 6.5L Turbo Diesel
Duramax L65 396 Vin "F"

Hey,
Just purchased a 93' Chevy 2500 6.5L Turbo Diesel. Pretty happy with it so far. A suggestion was made to me to remove the PCV and put a filter on the output and let it run to the atmosphere, obviously sealing off the intake where the return line previously went. Cant find a damn thing about this online, was wondering if anyone has done this or if this can cause issues due to the lack of "vacuum" from the intake pulling off the PCV. If this all goes well when I put a straight exhaust on the truck I'm planning on running a line from the manifold where the PCV was to into the exhaust to create a vacuum so it pulls all that shitty oily water under my truck instead of under my hood. Any advice or helpful hints would be appreciated.

Thanks!
Josh



93' Chevy 2500 6.5L Turbo Diesel
Duramax L65 396 Vin "F"

Welcome to the site. Make sure you take a trip through the FAQ's. Probably the main reason you can't find anything is because it's not called a PCV, it's called a CDR. You can find the answer to your question in one of the links in the FAQ under "C" for "CDR." It's not a Duramax either, not even close.

What RC said. And the short of it.... don't do it. One good CDR mod, I believe, is to put the cdr into the oil fill tube and reroute the hose. I don't remember who did this but it was a great idea and kept him from sucking oil into the intake.

I believe re-routing the CDR to the oil tube would defeat its purpose. I always thought it needed to be connected to the turbo inlet so that it would keep a negative pressure in the crankcase to help prevent oil leaks.

I believe re-routing the CDR to the oil tube would defeat its purpose. I always thought it needed to be connected to the turbo inlet so that it would keep a negative pressure in the crankcase to help prevent oil leaks.

he means were the CDR pulls the vapors from. the 6.5's CDR is hooked form the valve cover to the turbo inlet. The 6.2s had the CDR pull the vapors from the oil fill tube in some, and the valve cover in the others.

With the oil tube pickup you don't get that splashing oil effect from the rockers as much.

Of course you'd have to find a way to seal off the hole in the valve cover. That or get a 6.2 valve cover.

As far as removing it, there are a few people that has done it. Unfortunately, it is not something that will improve the running or performance of the truck because it will be bleeding oil all over the place. The CDR/PCV is there to regulate the pressure even if you route them to the exhaust. I think the Dmax do that but remember this truck is far from a Dmax and they are designed way different that Dmax. They call it PCV reroute and some vendor actually sells a kit for it. If it is a S truck which have EGR system, then, a lot of people have blocked it and get away with it. Removing EGR will improve performance and one less things to worry about. But you have an F truck, so that is not there already.

You can replace it with another system called Provent. It is going to cost you something.

What is your purpose of removing it?

As far as removing it, there are a few people that has done it. Unfortunately, it is not something that will improve the running or performance of the truck because it will be bleeding oil all over the place.

You can replace it with another system called Provent. It is going to cost you something.

What is your purpose of removing it?

JMJ

What is this Provent and where do I find info on it? My 83 with 6.2 apparently has a bad CDR and is losing oil all over the place.

Thanks, Don

Google it!!!

JMJ

What is this Provent and where do I find info on it? My 83 with 6.2 apparently has a bad CDR and is losing oil all over the place.

Thanks, Don
You can buy a lot of cdr valves for the price of a Provent. Napa is the cheapest on cdr valves. $45+ or -

iirc, last time I checked, the provent was over $200.:eek:

That is why I said, "It is going to cost you something"!!! LOL!!!

That is why I still have the stock CDR besides I did not know about this Provent until somebody at the other forum did it.

Anything aftermarket is going to be expensive. It is just a matter of whether it is worth doing it or not. Cost and benefit analysis.

OK, I understand that it is expensive, that answers part of my question. But, what is it , where does it hook up/mount, and how does it work? I've never heard of it before and knowing all this info would help me analyze pro and con for my situation.

Also, I've started checking parts houses around here for CDR's and so far can't find any.

Thanks, Don

A) don't mess with the way the CDR is routed. It's done that way so that the engine can burn it's own crankcase vapors (emissions) it prevents crankcase pressurization, and it helps lubricate the intake track (Think winter vehicle undercoating).

B) The heads are the same, just backwards side to side, there is no left and right, so are the valve covers Dave, just get another driverside cover without the hole in it ;)

C) the provent is kinda like a filter of sorts, it filters the oil out of the air, and returns it to the crankcase.

IMO Just buy a new CDR and be done with it, the benefit of doing otherwise just isn't worth the money or work involved.