| Author | Message | ||
| Craig (Ceieio)
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Doing a checkout on the bus after is has been setting a while. A couple of things needed attention, one being the emergency shutoff not working. When I push the button the solenoid retracts the arm, but the shaft barely rotates. I got the WD40 cure-all but that didn't so the trick. The shaft is hard to turn by hand. I turned it some while the bus was running and it changed pitch but didn't seem like it was about to quit. I was only willing to reef so far on it while those blower belts were whirring by. Is there some neglected regular maintenance that I should do, or any other fix ideas? The last time I checked this was November and it worked fine then. Any ideas are appreciated! Thanks, Craig | ||
| Vin (Billybonz)
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My 6V71 had the same problem right after I bought it. I used PB Blaster on it...sprayed it down every morning and worked back and forth. by the 3rd day it was working smooth again. I made a point to give it a shot of PB a few times a year. Bones 1973 GMC T6H4523 | ||
| Steven Braud (Sedab)
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What is PB Blaster? Where do you get it? I have the same problem with the emergency shut down on my bus. | ||
| TWODOGS (Twodogs)
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if you can't find PB...liquid wrench is good...they changed the formula on WD-40,it's not worth buying anymore | ||
| g
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PB Blaster is a great product. I pick up a can or two at Auto Zone when on sale. Grant | ||
| Jim Bob Rating: N/A |
The emergency air shutoff on a Detroit Diesl is not what's referred to as the "mousetrap". That is a spring device to reduce clutch pedal effort. Jim-Bob | ||
| Jim Bob Rating: N/A |
The emergency air shutoff on a Detroit Diesl is not what's referred to as the "mousetrap". That is a spring device to reduce clutch pedal effort. Jim-Bob | ||
| TWODOGS (Twodogs)
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detrit has no clutch....mousetrap covers the air intake....clutch is made by Eaton | ||
| Bill Gerrie
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Craig I had the same problem 20 years ago and have never had the problem since. I drilled a small hole in the housing to get oil to the shaft on each side of the intake. It worked like a charm. I have never had the shaft seize since. It is important to keep the shut off working as it is the only way to stop a run away engine. Never use it to stop an engine that is running faster then an idle except in an emergency or it will pull the seals out of the blower. Bill | ||
| RJ Long (Rjlong)
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Two Dogs - You're the only one I know of that calls the emergency shut off on a non-turbo Detroit a mousetrap. But then again, your background is in the trucking industry, and perhaps that's where you learned the term. Different jargon in the 18-wheeler world. . . In the bus industry, the mousetrap commonly refers the the clutch-assist mechanism found on GMC coaches with manual transmissions, as Jim-Bob mentioned. The bus industry commonly calls the emergency shut-off the same thing Detroit calls it: the emergency shut-off. FWIW. . .  | ||
| TWODOGS (Twodogs)
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he was asking about the mousetrap on a detroit;he must know more than you | ||
| TWODOGS (Twodogs)
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R.J.... craig knew,Vin knew,bill knew, I know...seems like you are the only one that is illinformed...I think you just like to argue | ||
| RJ Long (Rjlong)
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TD - Re-read what I said - I wasn't arguing, just commenting on the different industry's use of jargon. Jargon is jargon, every industry has it, every industry uses it. It just has to be translated now and then for clarification. It's like the word "chips" when referring to food. To folk like Peter (the Madbrit), it means french fries. To us here in the States, it means potato chips. Same word, different application. Time for lunch. . . | ||
| TWODOGS (Twodogs)
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have some chips....take a valium | ||
| RJ Long (Rjlong)
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You really enjoy needling people, don't you. . . | ||
| TWODOGS (Twodogs)
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................ | ||
| RJ Long (Rjlong)
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Cheers!! The next Guinness is on me! | ||
| TWODOGS (Twodogs)
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don't drink..............thanks anyway | ||
| Jason Whitaker (Jeepme)
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I've heard that you shouldn't use the emergency shutoff except in an emergency cause you'll be replacing blower seals. How fragile are the seals? I'd like to test the e-stop but haven't because I don't want to start burning oil. Can I test it at idle without cringing each time? Am I stressing the blower? Jason Whitaker 4104 6-71 | ||
| TWODOGS (Twodogs)
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slow idle...not fast idle...one time | ||
| Henry R. Bergman, Jr. (Henryofcj)
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Hey...RJ Long.....and if 5mg of Valium doesn't work...try 10mg. Suggest you take it with several large slugs of cheap red wine. Works for me! He he he. Oh, by the way, we may now have access to some Factory manuals (recopied) on a '75 Crown Coach. If you are interested let me know. CROWNS FOREVER!!! | ||
| TWODOGS (Twodogs)
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.......... | ||
| Craig (Ceieio)
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Thanks all for the info (and the entertainment!). I'll get some better penetrating oil and work the thing over. I'll also look at the possibility of adding oil holes as suggested; I just don't have that good of recall on the layout without looking at the thing! Best Regards, Craig | ||
| Buswarrior (Buswarrior)
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Hey, play nice! I wonder if the reason that some of us knew what Craig meant, and perhaps why he used the term "mousetrap" in his title is because of the misinformation started on this board? I am reminded of that old Steve Martin gag of the early 80's (the wild and crazy guy days) about teaching your kid to talk wrong and then sending him off to school... something like this: "can I mombo dogface down to the banana patch?" A newbie gonna sound foolish out at the DD dealer using the wrong words... ohh.... that's the real purpose?????? :-) happy coaching! buswarrior | ||
| DMDave Rating: N/A |
My emergecy shut-off did just that at full throttle just past Richmond once. I dident know what the hell happened! got out and opened the doors and saw it was tripped and reset it. It did it again 20 miles down the road so I wired it open till got home. It smoked heavy on restart but seemed to be ok. That was 15000 miles ago. The engine is 4-71 Detroit. | ||
| Bob Oakman (Bobsbus)
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I'm definitely a Liquid Wrench guy. Some time back I bought a case of WD-40, which did nothing compared to Liquid Wrench. I now use it to start fires in my fire pit. I can sit calmly in my chair by the fire with a glass of Bookers and a can of WD with the long red nozzle. I just hose down anything that isn't burning. If WD-40 doesn't get it going, the Bookers works fine. Never even tried my emergency shut-off. Is it common for them to stick? | ||
| TWODOGS (Twodogs)
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the realy terrible thing ,is that by the time you figure out you have a runaway...it's already too many r.p.m. to stop it | ||
| Vin (Billybonz)
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Bob, On the WD-40 burning...in '91 I worked for a printing press manufacturer. The welding fab area was in a raised concrete pad with a 4" curb running around it. The welder had loaded a fixture with steel to weld a press base. He used to spray the toggle clamps with WD-40 (LOTS!) to keep them from sticking. The propellant gas settled on the floor around his work area and when the arc struck...FLASH!!! I was told the propellant back then was propane...not sure about that. On the E-Stop sticking...both me and my friend have 6v71s and we both have had sticking problems. I like the idea of drilling oil holes in the blower housing, maybe even install an oil cup. Twodogs, on the runaway issue...my friend got his MCI (former Husky Lines) because the engine ran away...E-Stop didn't work, driver panics, puts the bus in neutral, engine reved real high and he slid it back into drive. It worked to stop the bus but it was an expensive E-Stop. Bones | ||
| Brian Brown (Fishbowlbrian)
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So what's the procedure for an E-stop when the E-stop don't work? I'm assuming a runaway means the governor stop (stop cylinder) ain't working either. Seems like a "pucker factor" experience if I've ever heard of one. BB | ||
| TWODOGS (Twodogs)
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procedure is the same as tornado...put your head between your legs..& kiss your ass goodbue... really...once it starts a runaway...& the emergency flap doesn't kill the engine...it will run till it throws the rods...this is what I've heard..never have had it happen to me... | ||
| Vin (Billybonz)
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I didn't mention, when I got my bus back in '01 and got the E-stop working I did try it at an idle...it did not stop the engine but it was huffin and puffin....too much vaccuum to pull it back off with it running so I shut it off and reset it. Didn't appear to do any damage but I'll never do that again. I also learned that the engine won't start if the E-stop has been tripped, the solenoid has power even when the master switch is in the off position. My son was playing around one day and hit the button...took me about an hour to figure that one out after which he quickly confessed he pressed the button and heard a klunk. I remember reading about a guy who's bus wouldn't turn off...not run away situation but it just kept running when switched off. He thought he could smufficate it with a plastic bag....he mentioned having a panel type air filter so I don't what kind of bus it was, but the engine quickly sucked the filter and bag into the intake. Must have been a mess. One more and I'm done...I used to drive a truck for International, right before Navistar came to be. Drivers were to do their own safty inspections, lights, check fluids, etc. If we needed oil we would pull in a bay and fill er up. The mechanics union complained about it so we had to have one of them put in fluids if needed...no problem, less work for me. So I ask for an oil fill, the guys sets the gun on the overhead hose for 2 quarts and it was supposed to auto shut off...it didn't! He tells me I'm good to go and about a block away this 6.9 starts blowing smoke real bad. I pull over and shut off the key but it kept running. I never knew a diesel engine could run on engine oil...but not for long. Bones | ||
| Stan Rating: N/A |
Brian: You don't want to be close to a run away engine but in a bus you have a reasonable distance between the engine and driver's seat so you can attempt to stall it. High gear, full brakes. When the fly apart, the pieces go out the sides of the engine. I saw a Cat piston rod stuck in a tree about 100 yards from the engine when the goveror rod broke on a 200 kw portable power plant. | ||
| Ed (Ednj)
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Okay, you guys. A mousetrap IS for the clutch linkage. It makes it easier to push in the clutch. And this is for you FF, GM had a problem with their stiff clutches and "borrowed" the mousetrap idea from Harley Davidson. For anyone who is interested in seeing a Harley mousetrap, click on the link below and you'll get the idea. (By the way, FF, Harley was making mousetraps before GM even knew what a bus was.......) http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4531773217&category=355 58&sspagename=WDVW | ||
| bowlingshoegiverouter Rating: N/A |
if you go into a truckstop & tell the mechanic you are haveing trouble with your emergency stop device....the least you are going to come out with is a wedgee........... | ||
| Bob Oakman (Bobsbus)
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Thanks Billybonz! I have a lot to learn about little details like that. I guess the smart thing to do would be to try the thing out and if it don't work, go to work on it with the lubricant. I certainly wouldn't want to see the rods flying out of my re-built 8V71. that sounds pricey. Would installing some kind of fuel cut-off device be a good alternative? bob | ||
| TWODOGS (Twodogs)
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not realy....you already have one...that is the only way to stop a diesel..in the 'runaway'...the seals in the blower are sucked in after the mousetrap flap fails to stop the engine & the high reving engine will run on it's own oil,when the oil is all used up...the rods fail & the engine explodes....not a fun experience,but a character building one  | ||
| Vin (Billybonz)
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So once the oil is used up, problem solved! | ||
| TWODOGS (Twodogs)
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Time to get the wife to push |
