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egr hose routing question 84 6.2L

C

crashyyz

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hey all.. i'm the new guy (been lurking awhile). not just new to the site .. new to diesel engines also. this is my first. it's a 84 K5 Blazer with the 6.2L

there are some weird routings and hoses running around the bay of this engine and although I see a routing diagram on the rad support.. it really doesn't tell me where they should go. specifially, there's the hose that runs from the oil fil tube, to something called a crankcase depression regulator valve. now, based on the crude diagram, it seems there are supposed to be two hoses running off of that. one heading somewhere to the left (drivers side) of the engine and one to the right (pass side) of the engine. mine has obviously been messed with, as i only have one hose coming out of the bottom of said valve and it runs over to the pass side and simply is dumped down by the front diff.

can anyone tell me where it's supposed to go. it obviously doesn't help with fumes inside the truck while driving (i've only had it on the road one day) :eek1:


thanks
crash
 
Those hoses are supposed to run to each side of the intake. Your intake should have two large ports on each side of it under the air cleaner.
 
thanks for the reply. i'll take it apart and see what i find tonight.

crash
 
thanks for the input... I'm back again.. 1 month later, sorry for the delay. the truck has been getting some body work done that I wasn't in a rush for ... hint: never tell a bodyman "there's no rush" :o

I got the truck back last night. took the air breather off and followed the hoses. there are in fact two that are running to the proper locations on the intake from the crankcase depression regulator valve.

There is however, still one hose that runs off the bottom of the reg valve from below the other two hoses that seems to be a vent hose at the bottom of the engine. it's about a 3/4" hose... if not even larger

Does this seem right or is this an extra hose that the previous owner has rigged up for some reason?

below I have posted some pics from under the CDR valve.. hopefully someone can help me out and identify if something is missing or how to route it to the correct location...
it's the hose that is kind of more brownish in color than the other hoses.. the pics show where it goes and how it just hangs (ends) going to nowhere down by the shock behind the front axle

the last pic is of the engine bay... i'm not sure what it's supposed to look like... is there anything missing???

thanks
 
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Nope, that hose is definitely something your previous owner did.

If you need the parts to make it stock again, let me know. I've got most of them sitting around in my parts pile from various 6.2Ls I've taken apart.

The little rubber "fittings" that these engines use are not available aftermarket, and are tough to find NOS these days, so if you find them, hang onto them!
 
thanks russell... any idea where it's supposed to go? or is where it's taped on to the bottom of the CDR valve... is that supposed to be capped off?

to me it seems like there is a piece missing off the air intake?? perhaps a hose is supposed to run into there ?
 
Yeah, just before the intake muffler there is that little oval piece. If I recall correctly, it is facing the wrong direction, and there would normally be a tube that runs from that piece to the hole in your core support to provide cold outside air to your engine.

With my 82 6.2L, the CDR came from the oil fill tube, into the tuna can, then out the bottom into a plastic fitting that split into two different hoses that ran to either side of the intake manifold. Mine didn't have a third line running anywhere.
 
so you think I would be safe to cap it off and just allow the two that run to either side of the intake to handle the recirculation?
 
see above post... someone has got to have one of these sitting in their driveway/yard out there somewhere to take a look at .... LOL :wink1:
 
When you run the engine, does a lot of oil come out of that hose? Or is it just some mists / fumes?

If you have too much oil going into your intake, you can have a run-away engine situation on your hand if the engine starts to run on the oil instead of the diesel. That isn't very common, and would require a fair bit of oil to happen though. Most of the time guys run a hose like that to the frame rail if their CDR canister doesn't work at all and they are having blowby problems.

I'd personally cap it and run it stock though.
 
thanks Russell. I think I'll try capping it. when you say 'run away engine situation' .. I'm guessing that means idle too high?
It seems to be all fumes coming out the hose. The end of the hose seems dry, not like there is oil or drippings coming out of it.

Guess I'll try capping it and see how it runs. If it starts to run fast or poorly, I'll extend the hose all the way to the back along the framerail somewhere.

thanks again
 
Diesel is essentially a light oil which your engine burns. If you get engine oil into your intake, and the engine is warm enough to ignite it, the engine will start to rev out of control until it either fails mechanically (rod out the block, seized up), or the source of either the unwanted fuel or the air path is removed / blocked off.

As you know, diesel engines are not regulated by the amount of air that flows past a set of butterfly valves but rather regulated by how much fuel is put into them by the injection pump. Since the engine oil is not controlled by the fuel cut off solenoid, the engine cannot be stopped by turning off the key.

If you haven't got any drippings etc, then you have nothing to worry about as far as blocking off that other line that is running to the axle.
 
Look closer and follow the hoses coming off of the intake to the cdr valve. They should connect to an upside down F looking fitting. 2 sides connect to the 2 intake hoses, the single end connects to the under side of the cdr valve "Where that hose is just hanging on your truck" I can see the F fitting behind that hose in your pics.

Check and make sure the cdr valve is not clogged while you are at it,


Here are some pics of it on my truck.
cdrvalve001.jpg

cdrvalve002.jpg

cdrvalve003.jpg
 
awesome!!!!! why you may ask??

after you posted those pics I went out and looked again. as it turns out upon MUCH closer inspection.... my 'F' fitting is there.. just like you and I both see. What you can't see is that it's been turned and mounted UPSIDE DOWN. Then this other hose has been installed. Who knows why the previous owner would have done this???

I will be removing the CDR from it's mount and flipping the 'F' fitting rightside up and reconnecting it to the CDR.

I'm sure there had to be a reason for him doing this.. unfortunately, he's somewhere between here and Alaska on a summer long road trip or I would ask

thanks for all your help guys. I'll post the outcome if connecting it correctly alters the way it runs at all.
 
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the good news is that i conencted it correctly and the fumes are gone. the truck ran just as it did before during the 10min or so drive into work.
thanks again for your help!! :)
 
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