My 8V-71 seems to slobber from one side only. How do you tell if the check valves are operating correctly? Can you service them, beyond just replacing them? Also, I was always of the impression that there where two slobber tubes on each side, front and rear, but I can only find one on each side. Are there two or one slobber tubes on each side of an 8v-71?
thanks, Brian
I had only one on each side.one was plugged ...I took apart cleaned and reinstalled. spring and plunger on inside pay attention to which side spring in on...not a hard job..
One on each side is normal but they can be install at the front also, make sure the check valve is on an angle when you clean and install it never install the valves on a true 90 degrees.
good luck
Hey Clifford, I am not sure about the angle of mine, but can you explain why they should not be 90 degree. I am assuming you mean straight down?
Thanks,
Tom Hamrick
On mine, they come off the block close to horizontal. You want them of something of an angle so they drain efficiently.
Brian
Bevans, to test the valves you should have air at idle coming from the drains and no air at the drains above 900 rpm fwiw where did you guys come up with the term slobber tubes is that a bus nut thing lol
good luck
I personally call them air vents, or alternatively those darn tubes that drain oil all over my driveway! But everyone else seems to call them slobber tubes and it seems somewhat appropriate!
Bevans, I wasn't trying to give you a bad time but 1 guy sent me a pm asking how he could stop his droller tubes from leaking and that was a new one for me they have always been knowed as air box drains to me.What ever you call it they are nasty when not working right
good luck
Puke tubes, just like a harley, one day nothing the next, Blaaaaa! LOL ::)
I'll go quietly now :-*
I made a slobber tube catch tank for mine that works well for about $30 and a couple hours including fabricating the brackets to attach to the engine block. It was a whole lot cheaper to make than pay over $200 that Walker Mfg. wanted.
Here are a couple pics.
HTH,
Bryan
Here is a picture of it mounted. I used 3/4" flat bar and formed it around the tank. Then bent to angles to bring it above the bottom of oil pan.
Bryan
Hey Bryan , Thanks for the pics , Iam finishing up mine this weekend and I like the vent you used . Did you built that or buy it . Nice job Thanks Andy
Andy,
I bought it at Oreilly auto parts. It is just a crank case vent. They run about $10. Can get them at probably any parts store. One thing I did do is when I tapped the PVC. I also cut a threaded female coupler into small nuts basically to put on the inside so that the fittings would not come out of the PVC.
Glad that helps,
Bryan
Well guys the catch cans are nice but you need to check those every day I agree with Cole on this you are covering up the best diagnostic tool that came with the engine it will tell whats going on and what side, just my 2 cents worth and I also have the catch can
good luck
Luvr,
Do you mind explaining why the catch can needs to be checked everyday? Thinking about making one for my replacement engine.
Thanks,
Brandon
Needs checked every day? (not absolutely, but recommended!)
The reason Clifford and Cole say this and I do agree is; If you have a problem with the engine, the drain tubes are big time clues as to what is going on, and to which side of the engine!
I have for a very long time used old windshield washer fluid jugs (that you can see thru) one on each side zip-tied to the frame rails so it can be seen what is in there! If you have a problem letting coolant into the air boxes you want to know about it immediately to find and fix the problem. (if it ain't too late!)
FWIW ;D BK ;D
Thanks BK for that info , Now to further educate us on this subject . When you say you would like to know sooner than later if you see coolent in the jug. Would that mean you have an issue with your sleeves as coolent leaking thur . or splitting ? Iam trying to wrap my head around these DD Thanks for your help Andy
Sleaves,head gaskets,injector tubes, it's stuff like that,you want to know about right away,Bryce is right about the clear container. ;D
I've seen them where a hole was cut into the lower thin side opposite of the cap for the tube drain into and air to escape. The bottle is mounted(tie wraps) sideways with the cap down so that you just remove the cap to drain it.
Andy, the 2 strokes are not like the 4 strokes they have ports in the sleeve that is why it doesn't have intake valves and 90% of the time problems like Van said will show at the drains 1st ( he should know by now) a bad injector that is dribbling will show most of the time, a bad blower seal will make a tube leak more oil also and the list could go on they serve more than making a mess.
The old school 2 strokes guys look at the tube the very 1st thing even if you don't notice there is a lot of info dripping out of those hoses
DD tied the drains into the oil pan on some buses for a short time to please CA big mistake cost them a bundle on warranty work but you will still see it on some buses and they have never had a problem so I have been told by the owners, no way would I do that I help a guy rebuilded his 6v92 with that setup
FWIW I check my catch can every time I fuel
good luck
Quote from: NewbeeMC9 on November 15, 2009, 08:18:33 PM
I've seen them where a hole was cut into the lower thin side opposite of the cap for the tube drain into and air to escape. The bottle is mounted(tie wraps) sideways with the cap down so that you just remove the cap to drain it.
Dang it that is such an awesome idea, why didn't I think of that? ;D
;D BK ;D
Clifford,
Where are yours mounted that you can see them each time you fuel up? I really need to do something on ours, and I'll take the cheap route for now, using a couple of milk jugs.
Paul
Thanks Clifford , Thats the kind of information that makes owning one of these DD a little easier or at least understandable. Iam learnning guys . Thanks for being patient. :-\
A Lot Of Us Guys Out Here Are Learning. ??? I Already Have Recieved A Ton Of New Information For My Little Brain To Retain. Retain Or Delete....Now Thats A Question. :o We All Have Questions That May Seem Really Stupid To Us. But There Is A Guy Out There Somewhere Thats Afraid To Ask The Question In Fear Of Being Seen As A Dummy. 10-4?
So Instead Of Spending Hours Looking Up The Q & A Of This Subject. I Might As Well Ask This Seemingly Stupid Question......See, I Feel Stupid Already And I Havent Even Asked The Question Yet :-[
So,The Slobber Tubes Are For... ( Blow-By ) Tubes?? Kinda Like A PVC Valve System On An Automobile?? Are They For Crankcase Pressure?? Of Sort?? This Would Be My Educated Guess.But For My Limited Knowledge Of The Detroit Diesel This Is What I Feel Would Be Correct....Right??? Wrong??? :-[
What Is Normal?? (Oil From Slobber Tubes) What Is To Much Oil?? Im Sure This Has Been Covered Many Times On Many Sites. But PLEASE Help Me Out Here And Set Me Straight. (Stupid Questions Will Set You Free..Brother). ::)
Am I The Only Guy That Feels Stupid Out Here??
P.S.... What Is FWIW ( Fat Women In Winter ) :-*
JOHN
John
The only thing I can tell you for certain is FWIW is "For What It's Worth" :o
The other stuff I would assume some of it and may actually be right but will let the experts speak up ;D
Bryan
Maybe this is to simple think of your air box like you shop air compressor....you have a drain on the bottom that lets out moisture and other things. the air box drains are pressure sensitive...at low pressure (idle) they are open and let out unwanted elements ....when the pressure increases (rpm)they close and deliver to the cyl...the drains are to help keep unwanted material out of the engine...if to much unwanted material shows up then you need to figure out where it came from..the other guys covered the probable causes..hope this helps
John,
The pressure in the air box is not crankcase pressure. It is pressurized by the blower. It is where the cylinders get the air to support combustion. Oil and combustion by-products tend to accumulate in there and need to be drained off. Normal amount is small as the drains normally open at idle and idling should be kept to a minimum.
There is a separate crankcase vent, either on the side of the block or in the valve covers, depending on the application.
Bob