| Author | Message | ||
| John & Barb Tesser (Bigrigger)
Registered Member Username: Bigrigger Post Number: 539 Registered: 9-2007 Posted From: 96.42.5.35  Rating: N/A |
Friday, running late, we threw the stuff in the bus and we were headed to get the rest of the band for a weekend bluegrass festival in Mondovi WI. The bus (which has never failed before) would start as long as I held the key on. When I would release it from the starting position it would die. After a certain amount of frustration, I called my diesel buddy and he said check the solonoid on the automatic shutdown on the governor (not the flapper on the intake). It was holding itself in the off position and had air behind it in the line. I took the air line off, vice gripped it shut and the bus ran normally all weekend although I had to "snub" it to shut it off as the key no longer functioned to turn it off. My question now is where do I start to determine why it was no doing what it was designed too. It is an air solonied but controlled by an electrical signal for on and off, low oil, high temp etc. Oh yeah 1966 4107 8V71 naturally aspirated, spicer 4 speed. Any ideas where to start? Thanks in advance, John | ||
| Dan Clishe (Cody)
Registered Member Username: Cody Post Number: 172 Registered: 1-2008 Posted From: 206.51.117.126 Rating: N/A |
I didn't know you guys were involved in bluegrass, we've enjoyed bluegrass for many years,, we know many of the players and hit as many festivals as we can, alices roots go back as far as her great uncle and his fiddle playing mountain music, I used to play but parkinsons and MS took away my fingers, trying to play using the aim and hope method got discouraging and I quit playing about 10 years ago. Her great uncle was born in 1848 and made his living playing barn dances around the country until about 1923 when his wife ellie got him hired to play on a radio station above a drug store in nashville so he played on the opry until his death in 1933,, she thought that because he was now on the radio that would be an hour a day he wasn't drinking but all he did was pull up a stool to set his jug on lol. | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1214 Registered: 8-2006 Posted From: 74.33.48.167 Rating: N/A |
Start with check the rear starting on/off position then if equipped with a override check the fuel pressure switch good luck (Message edited by luvrbus on August 01, 2011) | ||
| Tony LEE (T_lee)
Registered Member Username: T_lee Post Number: 82 Registered: 11-2007 Posted From: 209.112.181.180 Rating: N/A |
Check coolant level and anything else that causes the engine to shut down under fault conditions. Holding the key on to keep running is a safety feature to allow a stalled bus to be driven out of a dangerous situation. | ||
| George M. Todd (George_todd)
Registered Member Username: George_todd Post Number: 1268 Registered: 8-2006 Posted From: 99.37.28.23 Rating: N/A |
John, Turn the master switch to the on position, and check for voltage between the Skinner Valve hot terminal and ground. I'm betting you won't find any, as the bus will start and run with the start switch held down. This verifies that the Skinner Valve coil is good, and the low oil pressure override is working. Checking the rear-run and rear stop switches as mentioned above should be done immediately. If all of the above check OK, you have a loose wire, bad ground, or a bad run relay. If you can e me a schematic, I can help you look. G | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 530 Registered: 3-2006 Posted From: 216.198.139.38  Rating: N/A |
John You should have 12 volts on terminal 22 in the engine comartment when the run switch is on. From there it goes to the engine control switch then to the stop solenoid. Check the ground for the stop solenoid as well. If you have 12 volts and the ground is okay you have a bad solenoid. If you have no voltage on terminal 22 trace it back and see if you have 12 volts on terminal 22 in the drivers compartment. Terminal 22 in the drivers compartment is feed from circut breaker #2 in drivers compartment. Bill | ||
| John & Barb Tesser (Bigrigger)
Registered Member Username: Bigrigger Post Number: 542 Registered: 9-2007 Posted From: 96.42.5.35 Rating: N/A |
Well to be honest with you all, I didn't even know that I had switches in the back as everything is pretty dirty there and they are not on a panel off to the side in front of my face like the MCI has. There are 3 switches on the panel and they have never been switched that I know of. George, first check I do will be the voltage you suggested. I don't know if its part of the problem or not, but I went to turn the bus around in the dark the other night and the headlights wouldn't turn on. I used the fog lights and I knew I didn't have any night driving to do this weeknend so I didnt bother with it yet. I am afraid it is going to involve a trip into the panel on the left of the drivers seat. There is such a conglomoration of old, new, jumped wires with 3M connectors that I have no idea what is supposed to go where. I think the last driver may still be down there somewhere! THanks again guys, John | ||
| Gary Stacy (Stacytruck)
Registered Member Username: Stacytruck Post Number: 42 Registered: 12-2009 Posted From: 166.250.2.207  Rating: N/A |
Good luck | ||
| George M. Todd (George_todd)
Registered Member Username: George_todd Post Number: 1269 Registered: 8-2006 Posted From: 99.37.28.23 Rating: N/A |
John, It probably is part of the problem. The Skinner Valve is "normally open," in other words, with no electricity, it allows air to flow thru it. When it is energized, it stops the flow of air to the shutdown cylinder. So, if you have other dead things in the front, probably no power is going to the back. Bill has given you the terminal number to check, and needless to say, if #22 is dead in the front panel with the master on, there is your problem. G | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 363 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
Go get a case of cold beer and you will be able to see things more clearly. | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1221 Registered: 8-2006 Posted From: 74.33.48.167 Rating: N/A |
I always toss the skinner valve setup they are always a problems seems like to me and use the all in one shutdown from DD cost 100 bucks buses are the only thing I find that uses 2 valves to control 1 function good luck | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 655 Registered: 7-2004 Posted From: 67.141.74.177  Rating: N/A |
Clifford, can you send me the P/N for that all-in-one shut down? I don't need it myself, but it sounds like a much better system than those skinner valves! |