| Author | Message | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 136 Registered: 3-2007 Posted From: 66.243.231.37  Rating: N/A |
I have noticed that at night when I activate jakes there is a cloud that diffuses headlights behind Me! Do not see it in the daytime what gives? John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1349 Registered: 8-2006 Posted From: 184.12.188.147 Rating: N/A |
Out of adjustment John they are not going back to no fuel in most cases do you have a buffer switch or they a direct hook up If a blue smoke it will be another problem good luck (Message edited by luvrbus on January 08, 2012) | ||
| Bob Glines (Robertglines1)
Registered Member Username: Robertglines1 Post Number: 65 Registered: 11-2010 Posted From: 75.207.238.101 Rating: N/A |
John: your rad are loaded on BK's bus for trip! Bob. Thought you could use some good news. | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 1656 Registered: 7-2006 Posted From: 97.226.123.40  Rating: N/A |
I have the same...but black; can see in the daylight for sure! Suggestions on how to adjust? RCB (Message edited by chuckllb on January 08, 2012) | ||
| Brian Evans (Bevans6)
Registered Member Username: Bevans6 Post Number: 116 Registered: 5-2009 Posted From: 65.92.49.204 Rating: N/A |
If you are using the jake brake buffer switch, then the switch should not engage until the governor is in the no-fuel position. With a mechanical governor on a typical Detroit (which is all I have experience with) you can test this by moving the fuel cut-off lever (engine stop lever) on top of the governor to the no fuel position, while you have a test light or meter on the switch. The switch should engage only at the very last motion of the engine stop lever. After you do that, you can run the engine at idle with the jake brakes on, it should run normally. Next, raise the engine speed to around 1500 rpm with the engine speed lever, then snap it shut. The governor will go to the no-fuel position (as it does when ever the engine is in the over-run condition), and the jakes should engage. The engine may stall, but it should recover to a normal idle. If you don't have a buffer switch, then you need to rethink whatever strategy you have to force the jake brake to only engage when the engine should be in the no-fuel condition. If you do have the buffer switch and it is switching before the governor gets all the way to no fuel, then you can readjust the buffer switch (carefully) for 15 rpm rise after the idle smooths out, and then adjust the position of the switch on the mount so that it switchs at the right time. There is a factory jig for that, but I imagine that you could do it on the engine. Brian | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 137 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Bob, just read this and it just hit Me that My phone has not been taking msgs due to some kind of glitch! Could You gibe BK My cell #. 8 five 0-830-six six00. I hope He has not been trying to call Me! Tnx Bob | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 138 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Thanks for the info all of You. I do not have a buffer switch just a micro switch on the bellcrank where the throttle attaches and the trany cable attaches. I have no idea if this is a new problem or perhaps it has been this way for many years! I have no presencde of mind anymore. Good thing I no longer fly airplanes. I need some plan of attack to cure this thing. John | ||
| Brian Evans (Bevans6)
Registered Member Username: Bevans6 Post Number: 119 Registered: 5-2009 Posted From: 65.92.49.204 Rating: |
The switch you have cannot tell if the engine governor is at idle (fuel on at idle settings) or at no-fuel (fuel shut completely off and the engine on over-run - decelerating). You will probably always have a little smoke with that setup. I'm not sure if it's particularly bad, but only the buffer switch setup can differentiate between idle and no fuel. I suppose that it would be possible to mount a switch on the fuel rod to tell when it was at no fuel if you didn't want to mount a buffer switch. Brian | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 380 Registered: 2-2007 Posted From: 66.87.70.84 Rating: |
A little fuel sure makes them work better. | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 140 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Does anyone know if this switch dd# 1022351 is the buffer switch? If so where does the switch mount? John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1355 Registered: 8-2006 Posted From: 184.12.188.147 Rating: N/A |
John that is the right parts number but does not have a fast idle feature using that one you lose the fast idle the combo unit fast idle and buffer is around 600 bucks from DD and the buffer goes below the top of the governor it replaces the fast idle cylinder. Be careful trying to adjust one they will run away if not done correctly good luck | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 141 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Luvurbus, thanks for the info. The reason I asked I saw the switch I mentioned for 95 bucks brand new and thought it might be the proper one. I would prefer to have the fast idle feature although I am not sure why! My otr still works so maybe for that reason. How does the switch cause a runaway? Thanks John L | ||
| Brian Evans (Bevans6)
Registered Member Username: Bevans6 Post Number: 121 Registered: 5-2009 Posted From: 65.92.51.73 Rating: N/A |
The switch doesn't cause a runaway per-se, an incorrectly adjusted buffer screw can cause a runaway. And the buffer switch is mounted on the buffer screw, hence the word of caution. Do you have fast idle now? If you don't, you may not miss it. Brian | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 142 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Have fast idle now and use it on occasion in summer when using coaach air. Does anybody have a picture of the buffer switch in place? My manual does not show anything that refers to buffer switch. In which manual would I find info on installation of the buffer switch? Thanks for all of the help. John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1356 Registered: 8-2006 Posted From: 184.12.188.147 Rating: |
John, down load the trouble shooting manual from Jake Brake shows the buffer switch in section 1 on a Detroit Diesel it's a free download good luck | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 143 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Luvrbus, I have not been able to find a troubleshooting manual to download! Help what am I doing wrong. I know still breathing LOL. Thanks for Your help. John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1358 Registered: 8-2006 Posted From: 184.10.153.249 Rating: N/A |
John go to Jacobs Vehicle Systems, look under Parts ,Service and Support then look under the Technician section you will find the download good luck | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 612 Registered: 3-2006 Posted From: 216.198.139.38  Rating: |
John http://www.jacobsvehiclesystems.com/files/file/Troubleshooting-Guide.pdf This should be it. Bill | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1359 Registered: 8-2006 Posted From: 184.10.153.249 Rating: N/A |
Thank you Bill I tried to post the link for hours and never could get it to work so I gave up lol good luck | ||
| Jim Wilke (Jim Bob) (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 750 Registered: 2-2001 Posted From: 184.0.13.120  Rating: N/A |
Thanks also Bill, I downloaded it onto my "bus stuff" flash drive. I have learned the hard way to grab stuff like this. Lots of the links I saved to valuable old on line manuals, cheat sheets etc. are no longer there. Nowadays I copy it. | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 615 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
Jim It is always good to save manuals and info on systems related to our hobby. You just never know when you might need to refer to it or let somebody else use it. You are right about they aren't always around. Our hobby uses old technology and it is slowly disappearing. Try and find a mechanic that knows what a 2 stroke diesel is never mind one that is capable of working on one. Few and far between. Thats why this board is so valuable to us. Bill | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 1663 Registered: 7-2006 Posted From: 97.214.57.194 Rating: N/A |
Amen...and AMEN!!! And it is not restricted to 2 stroke diesels, to be sure. I have an up date coming on another thread about that very thing...stay tuned!  RCB | ||
| Jim Wilke (Jim Bob) (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 752 Registered: 2-2001 Posted From: 184.0.13.120 Rating: N/A |
Pretty scary thought that WE are becoming the experts by attrition! I'm pretty sure I don't even know enough to be dangerous yet. | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 144 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
I have now had a look at the website and am still in the dark! I have mounted on the left side of the gov housing a unit with a wire and a hose. I also have two air cylinders on the top of the gov housing. One for shutdown and I thought one for fast idle. What gives and what have I missed. John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1361 Registered: 8-2006 Posted From: 184.10.153.249 Rating: N/A |
Sure there is not 2 wires if so it will be a fast idle buffer comb/switch the cylinder with the line is a fast idle good luck | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 145 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Luvrbus, now for the rest of the story! I went out and used a bright light and the wire I thought went to the cylinder on the side of the gov body actually ran behind it and was not connected to it. There is only a air line connected to the cylinder no wires! Thesre is a wire from each head that connect to the throttle switch and that is it. I assume there is a switch in the line tht opens when the torque converter comes out of lockup. I will make sure ofthat when I drive bus next time. I pulled in for fuel years ago and left engine running and discovered engine running rough and noisy went to turn of engine and saw jake light on and engine smoothed out when I turned jake switch on panel off. Will try that next time I drive. It would have been nice if orignal installer would have left a print behind. Thanks John L | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 620 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
John The normal way to hookup Jakes is as follows: 12/24 Volts to a wire that goes to switch in the lockup port in the transmission then to the switch on the throttle. From the switch the wire then goes to the dash mounted switch. Two wires from the switch then go to the rear. One to each head to power the Jakes. Hope you can follow this. Bill | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1362 Registered: 8-2006 Posted From: 184.10.153.249 Rating: N/A |
John, this will make it easier for you www.bernhardbus.com good luck | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 146 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
I checked at the throttle switch and with jake switch on throttle switch closed I have 12.7 vdc at both wires going into heads! Resistance to ground 5.2 ohyms and with house master dc switch off no voltage. No lockup switch must have only had 12vdc coils so tapped off of house batterys. Coach is 24 vdc. No buffer switch no torque converter switch and mickey murphy prevails. Thanks for the help hope I can return the favour. John L | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1363 Registered: 8-2006 Posted From: 184.10.153.249 Rating: N/A |
John it makes no difference on the solenoids under the valve covers they are 12/24 Jake stopped that long ago but you still see a few volts specified if not marked they work on both | ||
| John Lacey (Junkman42)
Registered Member Username: Junkman42 Post Number: 147 Registered: 3-2007 Posted From: 66.243.231.37 Rating: N/A |
Thanks Luvurbus, I did not realize that but I still cannot figure why They would use the house electrical system when They were right in a panel with coach power available. Annoys the hell out of Me. I am going to check the Ht70 manual and see if there is a way to add a converter lockup switch. The problem for Me with a rewire is not ability it is age I cannot climb into some of the spaces I need to anylonger. Thanks for the help, John L. |
