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Author Topic: How much should my bus be slobbering?  (Read 3629 times)
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Dave Knight
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« on: March 02, 2008, 01:52:53 PM »

Maybe a somewhat relative question but how much should an 8v71 be draining out the tubes and are there variables which would make it drain more or less at times?


It seems like my tubes were leaving a little more than usual the other day. I know that DD's love to leave their marks but I'd like to leave as little behind me as possible. I would be sort of ticked if I were the owner of a place someone stayed and they left puddles behind.

While on this topic, I was thinking of building some vented boxes with some drain valves in them, does anyone have any neat plans based of what they did or am I on my own here?
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'75 MC-8   'Event Horizon'
8V71  HT740
Salt Lake City, Utah

"Have bus will travel read the card of the man, a Knight without armor in a savage land...."
gmbusguy1
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« Reply #1 on: March 02, 2008, 01:58:55 PM »

Walker engineering builds a very high quality airbox drain can. you can find them on the bay every now and then

Since installing ours on our Buffalo the "Holiday inn express" the shop floor is much cleaner

Sleep smart !

Chris
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JackConrad
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« Reply #2 on: March 02, 2008, 03:08:54 PM »

I used 2 12" lengths of 3" PVC pipe (one for each side. A cap glued to each end. Pipes are mounted horizontally on the engine frame rails on ourMC-8. I drilled and tapped a 1/4" hole in 1 cap near the blttem and installed a 1/4 turn valve to drain. I drilled tapped another 1/4" hole in the side of the pipe (this is the top when mounted). A hose barb fitting to connect the air box drain was installed in this hole. I then drilled and tapped a hole for a breather off a hydraulic revevoir tank. Tanks were attached tot he frame rails with large hose clamps (2 each).  Jack
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Growing Older Is Mandatory, Growing Up Is Optional
Arcadia, Florida, When we are home
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Dallas
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« Reply #3 on: March 02, 2008, 03:18:49 PM »

Since some of my humor isn't appreciated at times, I'll answer you seriously this time..

The air box drains shouldn't contain any oil. What they do contain is unburnt fuel and carbon. The majority of the slobbering problem is usually from idling too much which doesn't allow the engine to maintain adequate coolant temperature, which in turn causes unburnt fuel to build up in the air boxes.
Detroit diesel 2 stroke engines hate to idle more than any other engine you've ever seen except maybe for the old Continental radial engine in the MK III tank.
Another cause of slobbering can be caused by a poorly tuned engine or weak fuel injectors.
I think I would first look at your idling habits before anything else. Take the bus out for a run of 100 miles or so and make it work hard to get it up to temp and burn out all the crud and corruption.

Good Luck, I hope this helped and that the engine didn't shrink before.

Dallas
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Melbo
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« Reply #4 on: March 02, 2008, 03:29:32 PM »

I also built some "catch tubes" like Jack described for my 8V71 and it seemed to cut down on the mess left behind although it did not eliminate it completely.

I also found that I had fuel leaks that looked like I had "oil" leaks when I was parked but when fixed also cut down on the mess left when I parked

Melbo
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gm4106
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« Reply #5 on: March 02, 2008, 04:10:27 PM »

This mignt be of interest
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Dave Knight
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« Reply #6 on: March 02, 2008, 08:34:04 PM »

Yeah, that was helpful. Gives a good foundation, thanks!
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'75 MC-8   'Event Horizon'
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Salt Lake City, Utah

"Have bus will travel read the card of the man, a Knight without armor in a savage land...."
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« Reply #7 on: March 02, 2008, 08:45:35 PM »

Jack, that looks like a good future article for the Bus Conversions Magazine!?HuhHuhHuhHuh
Hope you and Paula are doing GREAT!
Helo from Dianne!
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
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Joebus
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« Reply #8 on: March 02, 2008, 08:49:12 PM »

I spoke to a gentleman a while back that had a 6v92 in his conversion. He had connected the airbox drain tubes to the oil pan........he had removed on of the plugs from side the pan inserted a T and connected both tubes to the T. Claimed he had no problems ........Any thoughts
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Joe Beleskey ,Stroud Ont. 50 Miles north of Toronto
1977 MC8, 8V71T, Auto
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« Reply #9 on: March 02, 2008, 08:49:31 PM »

http://www.busconversions.com/bbs/index.php?topic=7538.0

This is another thread running right now, it has a couple of neat phots of an ail box drain.
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
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« Reply #10 on: March 02, 2008, 08:51:28 PM »

JoeBus, look at Dallas' post above, as he says, it's not just oil, of that matter any oil, it's mostly unburned fuel and other 'stuff'!
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
JohnEd
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« Reply #11 on: March 02, 2008, 10:39:33 PM »

I think you would do less damage ifyou plumbed it into your freshwater tank. Shocked  Certainly less to the engine Roll Eyes

John
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« Reply #12 on: March 03, 2008, 04:56:56 AM »

Jack, that looks like a good future article for the Bus Conversions Magazine!?HuhHuhHuhHuh
Hope you and Paula are doing GREAT!
Helo from Dianne!
Jack
Jack,
   We plan to be in your neck of the woods in mid April.  We will give ya'll a call.  Jack
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Busted Knuckle
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« Reply #13 on: March 03, 2008, 07:05:11 AM »

I spoke to a gentleman a while back that had a 6v92 in his conversion. He had connected the airbox drain tubes to the oil pan........he had removed on of the plugs from side the pan inserted a T and connected both tubes to the T. Claimed he had no problems ........Any thoughts

Joebus,
Originally Detroit did the same thing, but it wasn't long before they realized what Dallas has pointed out and came up with a drain can similar to the "walker unit" and retrofitted those caught still under warranty, and issued a service bulletin after that to protect themselves. I used to have a copy of the service bulletin, but who knows where it is now! I'd strongly suggest that you don't run them back into the oil pan, and also that you'd point out the potential dangers to anyone you know that is doing this! FWIW Grin  BK  Grin
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makemineatwostroke
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« Reply #14 on: March 03, 2008, 07:17:15 AM »

I spoke to a gentleman a while back that had a 6v92 in his conversion. He had connected the airbox drain tubes to the oil pan........he had removed on of the plugs from side the pan inserted a T and connected both tubes to the T. Claimed he had no problems ........Any thoughts
   

Joe, that is for a incline engine only and you have to take the drains out of the block and use the 2 special plates with 2 check valves that bolt in place of the air box covers  ( on the low side of the engine) and they are not made for a standard engine installation. fwiw
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