Problem starting mc8 w/ 8v71

robertglines1 · October 06, 2019, 10:01:43 AM

Electric pump still looks like it is in return line instead of supply...Also that switch --low with one wire maybe fuel pressure switch. Still take wire off for test. you can put a hose fuel in let into a gal can of diesel. use engine pump( if is weak it will pump out of can. It's a long way from tank.. Take elect pump from present location and install just in front of filter inlet. Ace Rossi Lakeland Fl is in Tampa area. He knows 2 strokes.. Also Gomer from bno is at Ocola--mikelutestanski this board is just west of Ocola

Dave5Cs · October 06, 2019, 10:56:07 AM

Sean look on the front inside panel to the left of the driver and if there is a switch with CHIME on it, flip it and then try to start it. That was MCI's security switch in case someone tried to steal it. And make sure transmission is in Neutral.

SeanM · October 06, 2019, 04:37:25 PM

I'll try all the ideas and let everyone know the results. Thanks again for all the helping thoughts.

SeanM · October 13, 2019, 07:55:54 AM

Good news, got the motor running on its own. Turns out the injectors where stuck as well as the rack. Now the bus isn't airing up. Found a leak what I think is a leak in spare tire well in front of bus. Appears to be a valve of some sport. Air is escaping from bottom. Is there a plug (bolt) suppose to go in the bottom?

buswarrior · October 13, 2019, 08:12:01 AM

In the spare tire compartment?

Looks like the quick release valve for the front brakes.

it only releases air after you put service brakes on, and then release, the air from front chamber exhausts out there.

Steady leak is not right.

Where else is air escaping?

How much air are you building to before it stops?

Block the wheels, try moving the parking brake control to the released position and see if it stops.

happy coaching!
buswarrior

SeanM · October 13, 2019, 08:22:04 AM

It doesn't stop at all. Continuous flow of air coming from valve. Gauge on dash doesn't show it building pressure at all. Or gauge doesn't work. Haven't found any other air leaks yet

SeanM · October 13, 2019, 08:25:56 AM

Just found this leaking. Black dot is a hole.

SeanM · October 13, 2019, 08:27:32 AM

Better picture

robertglines1 · October 13, 2019, 08:28:16 AM

smack it !! with hammer to see if it just has crud under diafram . doesn't quite you will have replace it anyway.

robertglines1 · October 13, 2019, 08:35:38 AM

last picture ---is that a air drier? I had a MCI 8 and the air drier was in front.

SeanM · October 13, 2019, 08:36:09 AM

Definitely won't quite.

SeanM · October 13, 2019, 08:38:09 AM

Quote from: robertglines1 on October 13, 2019, 08:35:38 AM
last picture ---is that a air drier? I had a MCI 8 and the air drier was in front.

I'm not sure what it is. But yes it's the front of the bus in bumper compartment

robertglines1 · October 13, 2019, 08:56:12 AM

does that coach have a parking brake over-ride switch--put a screw in it. For test purpose only.! Could be tank for that/Anything else I would have would be a guess without being there. Looks like big solid lines going into and out of it.

buswarrior · October 13, 2019, 09:17:04 AM

If you have the proper air schematic for your unit number, you will get on better.

It fairly represents the locations and names of components.

MC8 had around 8 different air schematics, you MUST choose the correct one.

When you have a huge leak like you do, many valves will leak, not because they are broken, but because there is no force behind them to seal, and then you mis-diagnose the problem...

Get the biggest one stopped, go from there.

Happy coaching!
Buswarrior

SeanM · October 13, 2019, 10:32:48 AM

Ok, will do. thank you for the help.