Home » Public Forums » GMCnet » [GMCnet] update on the incontinent diesel engine
| [GMCnet] update on the incontinent diesel engine [message #174658] |
Tue, 26 June 2012 16:18  |
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Marc Hogenboom[2]
Messages: 70
Registered: March 2011
Karma: 0
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Here is an update on the status of my incontinent Diesel engine.
After making it home from Shawnee with the help of Hal Kading and Carl Stouffer I left the coach alone for a while. I had been under it a little more than I liked.
After a couple of weeks I started by doing a compression test on all cylinders, a job that requires taking of the turbo and the d.s. exhaust manifold, to be able to crew the adaptor into the glow plug borings.
All cylinders came out about the same, so no real damage there. The turbo bearings however had way to much play, so a rebuild kit was ordered online. It took 10 days to get the parts here and 1 hour to rebuild. After putting everything together I hooked up a pressure/vacuum gauge to the crankcase to find out what was going on. I took the coach for a drive and found that on idle and light load there was a nice small vacuum in the crankcase, but on more than half load the crankcase was pressurized. This explained the oil leaks while driving and no leaks while idling. Besides that there still was way to little boost despite the rebuilt turbo. Now I took out the CDR (crankcase depression regulator) and hooked up the breather line directly to the air intake and drove again. Now there was a nice vacuum on any throttle position.???? Still too little boost! What would cause this? Finally I thought of taking the air intake apart and check the cleaner.
MOUSE NESTS.
Between preparing the coach for the trip to Shawnee and the actual trip a family of mice must have taken up residence in the air cleaner box.
Than too much vacuum on open throttle caused the CDR to close and the pressure in the crankcase to build up. As soon as the engine was at idle again, CDR opened and there was case vacuum again. This is a new one for me! The case pressure must have prevented the free oil return from the turbo, causing the bearings to wear down extremely fast.
After cleaning the air cleaner, crankcase vacuum dropped to just above zero, turbo worked as it should and the leaks are mostly gone. Front mail seal developed a leak as a result of the over pressure, so I’ m not done yet, but the cause has been found. I threw away the CDR and built a catch can instead. Now I can keep an eye on how much oil gets sucked out of the crankcase and I’ll be sure there is a vacuum.I put a mesh over the opening in the air cleaner box, so the mice cant get in.
We took the coach for a 2 week camping trip and all went well, just a few drops from the main seal, so for now all is good again.
Marc Hogenboom
‘73 Painted Desert Diesel
Madrid NM
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| Re: [GMCnet] update on the incontinent diesel engine [message #174668 is a reply to message #174658] |
Tue, 26 June 2012 18:04  |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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<< MOUSE NESTS >>
congrats and thanks for the update.
always interesting all the things involved with these coaches.
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] update on the incontinent diesel engine [message #174684 is a reply to message #174658] |
Tue, 26 June 2012 19:39 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Marc,
That's good news that you finally got to the bottom of the oil leak problem. I know it must have been frustrating for you to have to spend so much of your time at Shawnee, working to find a solution. Kudos to Mike Miller for helping so much. It seemed like he was right there with you most of the time.
Living here in the Sonoran Desert, on the north side of Tucson. I am very familiar with rodent problems. Surprisingly, we have quite a variety of rodents here ranging from large Jackrabbits, to small Deer Mice. The worst offender is the 'Packrat', a large variety of wood rat. These guys get into everything, including under the hoods of vehicles, and can move in, seemingly overnight, doing considerable damage to wires, hoses, etc. A few a years ago, I had to have the ECM replaced in my Dodge V-10 truck, because a rat chewed the fuel injection wiring causing a short that burned out the driver to one of the injectors.
During a camping trip to Roper Lake State Park, a couple of hours away, but still in the low desert, I noticed the camp host's travel trailers had rope lights under them. I commented on this to one of my SOB friends and he explained that it was to keep rodents, particularly Pack Rats, away. Since they are nocturnal, they do not venture into well lighted places.
I went out and bought a few rope lights and a photocell switch, and strung them out under the motorhome. Guess what? No more Pack Rats. I had previously had to replace a plug wire on my Onan, and clean poop etc off my engine, but have not had a single problem since I stumbled on this remedy a few years ago.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] update on the incontinent diesel engine [message #174692 is a reply to message #174684] |
Tue, 26 June 2012 20:05 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Carl,
Hey sounds like you've come up with a new mod for GMC's!
We can attach rope lights all the way round the bottom and have them light up, blink, turn on and off in series, or other
variations.
We can be hip like these guys:
http://www.youtube.com/watch?v=81UM5sdeWP8&feature=related
Actually we'll leave them for dead! We got 26 feet! ;-)
Regards,
Rob M.
-----Original Message-----
From: Carl Stouffer
Marc,
That's good news that you finally got to the bottom of the oil leak problem. I know it must have been frustrating for you to have
to spend so much of your time at Shawnee, working to find a solution. Kudos to Mike Miller for helping so much. It seemed like he
was right there with you most of the time.
Living here in the Sonoran Desert, on the north side of Tucson. I am very familiar with rodent problems. Surprisingly, we have
quite a variety of rodents here ranging from large Jackrabbits, to small Deer Mice. The worst offender is the 'Packrat', a large
variety of wood rat. These guys get into everything, including under the hoods of vehicles, and can move in, seemingly overnight,
doing considerable damage to wires, hoses, etc. A few a years ago, I had to have the ECM replaced in my Dodge V-10 truck, because a
rat chewed the fuel injection wiring causing a short that burned out the driver to one of the injectors.
During a camping trip to Roper Lake State Park, a couple of hours away, but still in the low desert, I noticed the camp host's
travel trailers had rope lights under them. I commented on this to one of my SOB friends and he explained that it was to keep
rodents, particularly Pack Rats, away. Since they are nocturnal, they do not venture into well lighted places.
I went out and bought a few rope lights and a photocell switch, and strung them out under the motorhome. Guess what? No more Pack
Rats. I had previously had to replace a plug wire on my Onan, and clean poop etc off my engine, but have not had a single problem
since I stumbled on this remedy a few years ago.
--
Carl S.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] update on the incontinent diesel engine [message #174696 is a reply to message #174692] |
Tue, 26 June 2012 20:32 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Robert Mueller wrote on Tue, 26 June 2012 18:05 |
Carl,
Hey sounds like you've come up with a new mod for GMC's!
We can attach rope lights all the way round the bottom and have them light up, blink, turn on and off in series, or other
variations.
We can be hip like these guys:
http://www.youtube.com/watch?v=81UM5sdeWP8&feature=related
Actually we'll leave them for dead! We got 26 feet! 
Regards,
Rob M.
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That would be cool Rob. I could probably get away with it since I don't have any really close neighbors. Seriously, I am considering attaching the rope lights to the bottom of the frame so I don't have to roll the lights up whenever I move the GMC (to keep from running over them. Since I plug the coach in when it's parked, I could even hardwire them to 115 AC. Still need the photocell switch though.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] update on the incontinent diesel engine [message #174711 is a reply to message #174709] |
Tue, 26 June 2012 22:18 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Robert Mueller wrote on Tue, 26 June 2012 20:15 |
Carl,
Thought of some more hip stuff!
Add a GIGANTOR MASSIVE stereo system with lots of speakers would bring us higher up the hip scale.
Finally when JimB gets his pneumatic front suspension assist worked out we can build a GMC that hops!
Hmmmm the cold medicine I'm on might be affecting my brain!
Regards,
Rob M.
-----Original Message-----
From: Carl Stouffer
That would be cool Rob. I could probably get away with it since I don't have any really close neighbors. Seriously, I am
considering attaching the rope lights to the bottom of the frame so I don't have to roll the lights up whenever I move the GMC (to
keep from running over them. Since I plug the coach in when it's parked, I could even hardwire them to 115 AC. Still need the
photocell switch though.
--
Carl
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Hmmm...I wonder if the noise would keep the rats away? I don't think my neighbors would put up with THAT!
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] update on the incontinent diesel engine [message #174726 is a reply to message #174684] |
Tue, 26 June 2012 23:56 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| Carl S. wrote on Tue, 26 June 2012 17:39 |
... Kudos to Mike Miller for helping so much. It seemed like he was right there with you most of the time. ...
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I just needed an excuse to get a good look at his diesel installation. Plus after getting to know his personality (a little) I had a chance to give Marc a little ribbing... ie: "There is something to be said for staying stock!"
But really Marc has done a amazing job with his coach. I am glad he has found the "root" cause to most of his coach problems.
Way to go Marc!
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] update on the incontinent diesel engine [message #174729 is a reply to message #174726] |
Wed, 27 June 2012 00:17 |
peter bailey
Messages: 367
Registered: March 2009
Location: Gawler, South Australia
Karma: 0
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Senior Member |
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Marc,
That is great that you finally found the souce of your leaking oil problem and now if you have any of that talcum powder (you used to find the leaks) left you can use it for what it was originally intended for.
Peter Bailey
from Ozy (Aussie)
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