Hey Guys,
.
I'm with a friend, engine has no power, had a service truck come and help but they don't know whats wrong.
Plenty of fuel, changed fuel filters,now the engine will turn over but won't fire even on either. fuel through the lines.
tank full. does anyone have any clue what,s going on . switch off, wire loose? I'm posting this on my I-phone hopefully
someone will have a idea. MY CELL IS 317-358 7520
Thanks!
Steve 5B........
Guys that engine is in a MCI 8V-71
Steve 5B........
Sorry the hear of the troubles but,
If the engine turns over and no smoke, you know it is getting fuel. I would suspect the blower drive. Pull the air horn and see if the blower is turning.
Hope this helps
Don
Hi 5b Steve,
It sounds like the engine is starving for air. This is only a guess but maybe the air damper in the blower inlet got triped. The air damper is held open by a latch that can be triped by either the solonoid or by hand. The other possibility is the shaft that drives the blower broke.
Good luck, Sam MC8
Fuel pump?...Cable
Electric controlled or mui?
When it cranks does it sound like it still has good compression? Did it get hot before it lost power?
Post your location.
Schraeder valve?...Cable
Hey guys. What is a schrader value. No it wasn't hot befor it shut down. Steve 5B....
Sits on the engine. Piston pushes crescent shaped arm that shuts off the fuel. If it doesn't relax you get no fuel. Last time it happened to me. I unbolted it from the manifold so the crescent arm could open and we could move...Cable
Did he hit the Emergency Stop switch? Closes flapper at blower..Cable
Here is the engine stop cylinder on top of the governor. If the piston is sticking out, it will keep the fuel shout off. If you loose power to the solenoid that controls this piston or the solenoid fails, this piston will not retract. The piston can be moved by removing one of the 2 mounting screws and twisting the piston to the side so the piston no longer contacts the engine stop lever. Jack
Just spoke with him ..they are running...Alge in tank
Interesting conclusion, but I thought he had said it would not start even with ether. I would think that if there was ether, air and compression it would turn over.
Hey Guys,
I WOULD LIKE TO EXPRESS MY SINCERE APPREATION TO EACH AND EVERYONE THAT POSTED AND PERSONALLY CALLED MY CELL
TODAY TO DIAGNOIS THE PROBLEM THAT WE HAD ON THE ROAD THIS AFTERNOON. JACK, THANK YOU FOR THE PICTURE, NOW
I KNOW WHAT A SCHRADER VALUE IS! WHAT HAD HAPPENED WAS THAT THE TANK HAD ALOT OF ALGE AND THE LINES WERE
FULL. ALSO HE JUST WASHED THE ENGINE AND FOR SOME HOW WATER HAD GOTTEN IN THE THE BIG HOSE FROM THE AIR
CLEANER TO THE BLOWER. THAT'S WHY IT WOULDN'T FIRE WITH ETHER. ALSO, THE LINE IN THE TANK WAS SHORTENED (
FOR THE TIME ) SO IT WOULDN'T PICK UP THE SLUDGE ON THE BOTTOM OF THE TANK. RE-PRIMED LINES BLOWN OUT, SHOT
OF ETHER AND AWAY WE GO!
MANY THANKS AGAIN!
STEVE 5B......
Hi 5B Steve,
Glad the problem is solved.
Jack posted a picture of an engine stop cylinder, NOT a Schrader valve. A Schrader valve is what your wheels have in them for inflating and deflating. A Schrader valve consists of a valve stem and a valve core. Please Google Schrader valve and read the information for yourself. It is confusing when someone misidentifies a part, especially in your situation of being stranded on the road with the stress of trying to find and correct a problem.
Again, glad the problem is solved. Sam MC8
Quote from: Sam 4106 on March 27, 2010, 06:40:55 PM
Hi 5B Steve,
Glad the problem is solved.
Jack posted a picture of an engine stop cylinder, NOT a Schrader valve. A Schrader valve is what your wheels have in them for inflating and deflating. A Schrader valve consists of a valve stem and a valve core. Please Google Schrader valve and read the information for yourself. It is confusing when someone misidentifies a part, especially in your situation of being stranded on the road with the stress of trying to find and correct a problem.
Again, glad the problem is solved. Sam MC8
Thanks Sam. That one bugged me when I read it, too, but I didn't have the time to correct it. I was just hoping that Jack's photo would be enough for Steve to figure it out, and that his tires were still full of air :D
As for the problem, I'm glad it's working again, but have serious concerns about the diagnosis. If you got water in your air intake tube, your air intake tube, then you probably have a split in the
rubber somewhere, which will be sucking all sorts of dust directly into your engine, bypassing the big ole restriction we all call an air filter. That's not gonna do your engine much good. But then,
if it's really all full of algae, as you say, it sounds like it hasn't been well cared for anyway. Here's hoping this is a new acquisition by your friend and that much needed care is about to commence.
I thought, possibly, the reference was to the Skinner valve.......
Thank you...Shraeder Skinner. Golden years my butt. Half of what I knew is gone...The rest is wrong...Cable
Just FYI I have a Shrader valve on my shut down, It is on the air cylinder that the skinner controls. Basically if I remove the air from it the engine shuts down. This is something I have never really understood. I've posted about it here with no reply so I figure it is another PO add on. The "skinner" pressurizes the air cylinder, which seems to allow full motion of the rack when pressurized ( also and ???the rack has full motion when I have no air pressure), emptying the air via skinner or shrader, "momentarily pushing the rack closed" and shuts down the engine. This system is less than ideal as it is not very positive, sometimes I need to activate it twice for shut down.
Anyone care to explain?
Steve, Questions. How long had she been sitting, how old was the fuel and was the tank full?
I ask this because I've never seen alge in our tank, course we live in a fairly dry climate.
Glad you got 'er back on the road, what an experience huh!
Alge brought me to a complete stop in the middle of the road, the lines were actually plugged and had to be blown out. Very frustrating. Now you need to use a fuel treatment to kill the alge. Not what they sell at truck stops but a quality biocide. Here's one.
http://www.westmarine.com/webapp/wcs/stores/servlet/SiteSearchView?catalogId=10001&Ntx=mode+matchallpartial&keyword=bio+cide&Ntt=bio+cide&N=377+710&y=0&x=0&storeId=10001&Ntk=Primary+Search&ddkey=SiteSearch (http://www.westmarine.com/webapp/wcs/stores/servlet/SiteSearchView?catalogId=10001&Ntx=mode+matchallpartial&keyword=bio+cide&Ntt=bio+cide&N=377+710&y=0&x=0&storeId=10001&Ntk=Primary+Search&ddkey=SiteSearch)
Bacteria and fungi can grow in diesel fuel tanks causing bio-contamination appearing like a black stringy slime or sludge. This contamination can cause equipment to shut down by plugging filters. This acidic slime and sludge contamination can corrode tanks and engine parts.
ValvTect BioGuard Fuel Microbiocides are EPA registered microbiocides that quickly and effectively kill and prevent the growth of bacteria and fungi found in diesel fuel, heating oil, residual oil, lubricating oil and Gasoline. BioGuard works in as little as 2 - 3 hours.
Quote from: zubzub on March 27, 2010, 11:22:07 PM
Just FYI I have a Shrader valve on my shut down, It is on the air cylinder that the skinner controls. Basically if I remove the air from it the engine shuts down. This is something I have never really understood. I've posted about it here with no reply so I figure it is another PO add on. The "skinner" pressurizes the air cylinder, which seems to allow full motion of the rack when pressurized ( also and ???the rack has full motion when I have no air pressure), emptying the air via skinner or shrader, "momentarily pushing the rack closed" and shuts down the engine. This system is less than ideal as it is not very positive, sometimes I need to activate it twice for shut down.
Anyone care to explain?
Well, it seems like maybe your shutdown is hooked up backwards, with wrong parts, but can't say for sure. The normal operation of the shutdown is with a spring loaded air cylinder that
retracts when pressure is released. The Skinner valve is normally open, and is held closed by electric, which cuts the flow of air to the cylinder and the spring retracts the push rod away
from the rack shutdown. When electric is cut to the skinner (e.g. turn off the bus), the skinner returns to open position, air flows to the air cylinder and pushes the push rod into the shutdown
lever, which shuts off the flow of fuel to the engine.
That's how the "normal" operation works. Maybe there was something different before my time as your bus is older than I am and I don't claim to know everything about anything. :)
Removed
Yeah, I may not have explained exactly what happens vis a vis the skinner but I do know for sure that bleeding the air from the air cylinder via the shrader shuts er down. I don't understand it...but it works. I will continue working on other stuff and one day I'll understand it. My feeling has always been that someone used the shutdown system from another type of diesel and fitted it to this engine. FWIW I scavenged the shutdown from another ('58) 4104, those bits did not match what I had, and as I did not scavenge the rack pushrod from that bus, I can't use them (this was before I had worked out mine wasn't OE)...I guess this one gets.."if it ain't broke...."
Zub,
Dallas and Gumpy are correct. I really don't see how it could be hooked up in reverse and still work since it takes air pressure to shut it off and a spring holds it open. That would be hard to do.
The ultimate test is to start the engine with no air in the system. The engine will start and then continue to run even with the engine run switch off. When this happens you can't shut it off until the air builds up.
With no air you can also start the engine with all switches off by jumping the starter solenoid since the starter always has battery power. It will run until the air builds up and shuts it off.
I've done all this on my 4104.
The downside to doing this is that if the engine runs away you have only the emergency shutdown to stop it.
Yeah I've been there, and I know the air baffle shutdown doesn't stop my engine just bogs it down, then I drop the clutch and it dies. I took a pic of it today. I'll start another thread calling on all non DD people to see if they recognize it.
maybe you need to look into this company??? http://www.algae-x.net/4/4/Product%20Literature.html (http://www.algae-x.net/4/4/Product%20Literature.html)