| Author |
Message |
Terry Mac (67.233.187.207)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 3:10 am: | |
Well its winter time in Iowa again went to pick up my bus from the shop.Got my rear main done and my air leaks taken care of.Went to pick her up and all I got was about 10 spins and thats all she wrote.Now to the question how do you jump start a 72 MC7?
Baby its cold out there |
FAST FRED (65.154.177.31)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 5:23 am: | |
Have them haul it into the shop overnight & charge the batts too.
If installed ,plug in the block heater while in the shop.
You will need fully charged batts, a bit of ether and a large batt to get her running if not pre warmed at zero deg F.
FAST FRED |
Nick Morris (Nick3751) (65.117.139.135)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 8:22 am: | |
Depending on how long it sat there in the cold your batts might be done. I've heard some guys on here say that they hook 24v to the started to crank one, don't know that much about it but I'm pretty sure you'll have to isolate the started first.
My 671 had one new bat when I bought it and I think between northwest ohio and vergina, where I bought it, the new bat got killed. I'm guessing from running one dead and one good wire parrallel I ended up with two half charged or less. Needless to say it wouldn't start and I finished my batts up trying to charge 'em. Just some thoughts I'd another opinion other than mine since I'm new at this stuff. |
jim mci-9 (209.240.205.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 10:11 am: | |
warm it up for easier starting.... block heater... kerosene jet heater.... you could wash it with a steam cleaner.....i'd
charge the batteries...i'd also hand-prime the secondary fuel filter while you were waiting...it cant't hurt... your mci is 24volts, so make sure all the connections are good, clean and tight.... |
BrianMCI96A3 (69.34.170.181)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 10:25 am: | |
I tend to agree with Fred, a warm place overnight, with two fully charged batteries as your bet bet. After your batteries are FULLY charged and their peak voltage is reached, IF they will not charge to at least 12.5v I'd be thinking about new batteries.
Gelled fuel is always a concern in extreme cold, but in this case it may simply be a case of weak batteries. If you feel you must try to jump start it, your best chance would be to wait till mid-day use a FULLY charged 8D truck battery on a dolly, attach the jumper cables to the jumper battery first... positive terminal first, then negative... Your coach should 24V so, not to complicate things, choose one battery or the other, and attach the the positive cable of the jumper cables to the POSITIVE post of the battery you choose, then with the negative jumper cable in your hand and your face turned away, tap the jumper cable end on the NEGATIVE POST OF THAT SAME BATTERY. If there is no violent reaction when doing this (if there is a violent reaction, you have either hooked the cables up improperly, or there is a short circuit) attach the jumper cable to the negative post, spray ether into the the ether cup on the air horn and attempt to start the coach using the rear engine control panel.
Brian |
Telestar (142.59.79.109)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 11, 2004 - 10:58 am: | |
Hi Terry, before doing anything I would sugest taking a reading on each battery cell. One dead cell in any one battery can cause you a lot of grief in all the others, not to mention an overworked allternator-generator.Food for thought.Cheers, Emery |
eric hanna (67.127.184.240)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 25, 2004 - 11:08 pm: | |
move to california |
Mark R. Obtinario (Cowlitzcoach) (204.245.228.80)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 26, 2004 - 10:03 am: | |
Batteries are rated at 70 degrees. At the temperatures you are experiencing, your batteries are going to be performing at about 20% of rated capacity. So unless your batteries are in really good condiditon you are going to have problems.
Remember, in order for a diesel to fire you have to have enough heat in the compression chamber to fire the fuel. If your batteries are low you are not going to get enough speed out of your starter to create enough heat to make your engine fire. Hence the need for ether when it gets really cold. Ether lowers significantly the asmount of heat necessary to cause some fire.
If you are going to try and jump start you will need to jump both batteries. Your -7 has a 24-volt starter. Jumping just one battery is only going to give you some warmed up 12-volt.
I have had some electrical problems with my -7 lately. Not sure exactly what is going on but when I tried to jump start with just one of the batteries hooked to a jumper I still didn't have enough juice to get things going. Once I hooked up both batteries to some jumpers I was able to get the engine started.
Putting some heat into the engine compartment is a very good idea as well. 40 wt oil gets pretty thick and heavy at temps below 40 degrees. Warming the oil up so it flows better will help the starter spin the engine over faster. Warming the blower so the air entering the combustion chamber will help as well.
Cold winter weather surely tries men's souls, that is for sure.
Good luck.
Mark O. |