| Author |
Message |
Bill Upnortdareh (152.163.252.163)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 22, 2003 - 1:19 pm: | |
When I was reading another post some time ago,I got wind that somebody had a pretty good collection system for the slobber tubes.I ran a search on it but couldn't find anything.Since I have a white coach pulling a white explorer,I really need this. Any imput on this would be greatly appreciated. Bill 4104-4032 |
Peter E (Sdibaja) (64.165.8.176)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 22, 2003 - 1:50 pm: | |
see what DD sells...
http://www.detroitdiesel.com/Public/sp/18sp284.pdf
or
http://www.detroitdiesel.com/Public/sp/18sp285.pdf
I made mine from some scrap 3"ABS drain pipe about 20" long with a cleanout screw end to drain it and hung it from the cradle with a couple of straps...
I bent the slobber tubes to run in thru holes in the top, no fittings used.
I have not put on many miles yet but it seems to make a big difference.
Peter |
Peter Broadribb (Madbrit) (65.73.177.125)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 22, 2003 - 1:56 pm: | |
MCI had a system for this. There was a similar method mentioned a while back which used a section of plastic schedule 40 pipe, capped at both ends with the slobber tubes draining into it. It has to have a weatherproof breather on top, such as one from a car rear axle and they had a bleed valve on the bottom to drain it out. You can mount it anywhere where the tubes will drain reasonably straight down. Draining the catchcan will obviously depend upon the amount you use the bus engine.
Peter. |
John Rigby (65.112.227.94)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 22, 2003 - 4:50 pm: | |
When I purchased mine for my 4104, it came with one way auto valves that let the air come out of each of the drains but do not let it go back.the tubes a canister, and the canister has a breathing K and N filter on top
I didnt want to experiment and it not work.
With this unit and purchasing the two 90 deg exhaust chrome bends from camping world, NO MORE OIL OR ANTHING ON THE TOAD AFTER 2000.MILES.
John |
Geoff (Geoff) (66.238.120.66)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 7:58 am: | |
I hate it when people call air box drains
"slobber tubes"-- that implies that the engine drools naturally and that is a false implication. You should not have oil pouring out the air box drains, maybe a drop or two on occasssion but if it leaking enough to cause a problem then you need to fix the leak-- it could be blower seals or bad rings. Also, you probably have several other oil leaks from your engine that is causing a mess.
--Geoff
'82 RTS CA |
Bill Upnortdareh (152.163.252.163)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 8:19 am: | |
I really don't like the term either,but being a newbe I don't have correct terminology yet. Yes there are probably plenty of leaks to fix but this seemed like a place to start . Bill 4104-4032 |
BrianMCI96A3 (65.40.247.20)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 8:36 am: | |
Geoff,
I actually like Detroits, I fell in love with them 20 some years ago when I heard one being run up in a spotless and very shiney, Texaco tanker truck pulling polished double alluminum tanks, no less... But I am one of the few mechanics I know who doesn't call them 'damn leaking Detroits' It seems to me there is a lot of bias out there, and 'slobber tubes' is part of it, because really, of the Detroits we have had over the last few years, they haven't given us trouble at all, we did have a rash of 8V71 trouble in the middle 80's but the big silver 92's we've had have lasted.
Brian |
John Rigby (65.112.227.94)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 3:45 pm: | |
I hate it when people refure to the readue coming from the slobber tubes as oil coming past the rings or blower seals, this just is not true. The oily looking substence is in complete or half burnt fuel oil that did not go as smoke thouhg the exhaust. Its like oil you put in a pan and burn over an open flame runny burnt oil.This happens more when let a detroit idle to much.
Sorry Geoff, I also always used to think it was oil but its fuel.But open as always open for input.
John |
Mike M (64.252.213.83)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 5:54 pm: | |
Some GMC's came with a drip pan under the engine.
My 4903 has twist clips like it had one at one time. Imagine the poor sucker folling the bus when the pan flew off!
I plan on making a new drip pan with a drain plug at the low point in the future... |
John Rigby (24.174.239.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 6:13 pm: | |
Mike
My 4104 also has clips were the drip pans were, but I think the drip pans performed much more of a service than just catching the excess fluids. I strongly feel that the pans clipped on underneath the engine helped propell the air flow away from the radiator and therfore keep everything cooler.After being very interested in buses for the past 25 years I have yet to see a 4104 with them still attached.
John |
mel 4104 (208.181.100.35)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 23, 2003 - 9:40 pm: | |
John i think that the pans you are refering too are not ment for drip pans as i still have them on my 4104 and they would not catch much as they are louvered and come in sections and are held on by those D type spring twist clips that hang down from the engine cradle. their main use was to keep any objest of the road flying up and hitting the cooling system or the engine or tranny and causing damage. as these buses were sued on a lot of unpaved roads when they were new [1956] era and later. every once in a while you hear of some one that has picked up some thing and it has punchured the pan or oil cooler.even the tranny on one running here had the drain pug smached out by a piece of spring off a truck that was laying on the road. mel 4104 |
John Rigby (24.174.239.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, October 24, 2003 - 6:29 pm: | |
Boy I wsh I could find some for my coach.
John |
DonTX/KS (205.187.92.222)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 25, 2003 - 8:12 am: | |
I think if you look at the 4903 parts book, you will find those clips are for wire mesh screens, mostly to keep road debris out of the churning parts. Not sure about the 4104 ones, never seen them. |
Rodger (64.70.24.54)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 25, 2003 - 10:41 am: | |
Regarding the fluid coming from the air box drains not being motor oil but rather fuel:
I respectfully submit that although it could possibly be fuel, it is most likely oil.
After a long run, my 8V71N occasionally drips from the air box drains, a few drops of what I assume to be oil. This oil may have some fuel mixed with it but it appears to be 100% oil. I avoid idling the engine any more than necessary, so I have no idea how much would drip from the a. b. drains if left idling for a long time. A small amount of oil seeps from a spot or two at the tranny end.
I attribute the light oily film accumulated on the toad, after a couple thousand or more miles of towing, to be from diesel and oil in the exhaust and oil leaks more than drips from the air box drains.
Oil consumption, I'm told, is about normal - up to a gallon in 2K to 2.5K miles if run between the Add mark a couple of qts below the full mark on the dip stick; or up to 1 gal in 1500 miles or so, if kept filled to the full mark.
An 8V92 in a MC6, I considered buying, had literally a steady stream of motor oil pouring from the air box drains when idling. Inspection by a mechanic, including removal of the air box covers, revealed oil in the air boxes. The mechanic informed me this indicated severely worn cylinders and/or piston rings. His term was a "blown" engine.
My conclusions from these experiences is that normally, fluid exiting the air box drains is all or mostly motor oil and more than an occasional drip, indicates worn cylinders and/or piston rings. I'd suspect a noticeable amount of fuel in the air boxes to indicate some other problem. |
Geoff (Geoff) (66.238.120.19)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 25, 2003 - 11:19 am: | |
If you have problems starting the engine or leave it idleing a long time you can build up fuel in the air boxes and have fuel out the air box drains (as well as the exhaust), but yes, I agree with Rodger that usually it is oil. The 71 series Detroits don't usually have a significant amount of oil out the air box drains even when the engines are tired, but on a 92 series the first sign of a worn engine is oil past the rings and out the air box, even when the engine still has good compression and starts easily. Either engine can have bad blower seals making oil out the air box.
On 92's the oil collection cannisters are popular-- even though the 92 engine runs good, oil loss through the air boxes will progressively get worse on a worn (not blown) engine, so the cannisters prolong the inevitable needed overhaul.
--Geoff |
John Rigby (24.174.239.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 25, 2003 - 12:15 pm: | |
I do not have the experience of Jeff nor probably Rodger, but my first 671 engine in my 4104 have what I was told was blow by. Oil coming though the breather behind the engine, that kept engine oil all over the exuhast pipes under the engine the back of the bus and all over my toad.This was most definetly oil as you could see the consistancy and the way it dripped everywere.
I eventually changed this engine out to an out of frame rebuilt 671.umfotunatly, due to my leaking air sysytem I had to idle the coach 30 minutes before a trip.Well when I arrive at my destination there was oily looking deposits on the back of the bus and my toad(none coming from the back breather and therfore non on the exhuasts.
Being alarmed and checking with Stewart and stevenson and others, it appears it was unburnt fuel coming though the air box and leaking out the air box drains.The air box drains were doing what they were designed to do and I was told less idling less fuel though the dains.
Since I have installed my new levelling system, added the collector and also turned the exhuast pipes away from the rear I get next to no oilly deposits.
John |