Help 8v71 wont start

carneybus · February 25, 2016, 02:55:42 PM

hello all,

So my MC9 will not start. I have checked fuel lines and I can't seem to find anything leaking. it cranks and I get the white cloud off death but it wont fire. any thoughts. Ive checked the emergency shut off and still nothing. I had parked the bus closer to the house so I can gut it and put the floor in. but now it's time to move it back. she just wont start. I have tried the block heater and read the troubleshooting posts on here for weeks now. someone please help!

I'm pretty sure it's something small and I have over looked. the tank is about halfway full.
I look forward to hearing from you all..

James

chessie4905 · February 25, 2016, 03:16:11 PM

Make sure the block heater actually working. Is the engine warm when you try? Is it spin ING over normally or slow? A decent 8-71 will start in about 1/4 revolution.

luvrbus · February 25, 2016, 03:21:10 PM

You can hear the block heater when it is working I see in your area it is in the 30's they need a little help that cold when they are weak

carneybus · February 25, 2016, 03:31:09 PM

I left the block heater on (working) for about 6 hours today. it was warm when it made complete rotations. i'm going to try switching out the fuel filters tomorrow.

luvrbus · February 25, 2016, 03:36:24 PM

It needs priming then if the block is warm and the engine is spinning

robertglines1 · February 25, 2016, 03:59:59 PM

Suppose to be 65 in your neighbor hood this weekend. I live in Evansville Ind and pass thru on way to Nashville every couple weeks. In Frostproof Fl now for a while. Ck make sure your rear switch is in correct position also if your trying to start from rear make sure front switch is on. Your shut off cyl could be stuck out also--to try it take phillips screw out one side and turn sideways. You can shut off by hand if needed. Fuel is first thought then elect then shut down cyl. Are you military? Bob

carneybus · February 25, 2016, 04:08:03 PM

Bob,

Yes I am Military. I'm a Former Marine. I figured it was something simple. I want to replace the fuel filters so now i just have to a find a place that has them. good thing there is a truck stop at exit 1. they usually have what I need.

HB of CJ · February 25, 2016, 05:40:55 PM

Just a hunch here but does the mighty Detroit sound quite different when it is spinning? How fast is it spinning? It might take two folks to re set that flapper.

OneLapper · February 25, 2016, 06:42:35 PM

Quote from: HB of CJ on February 25, 2016, 05:40:55 PM
Just a hunch here but does the might Detroit sound quite different when it is spinning? How fast is it spinning? It might take two folks to re set that flapper.

Ditto. Flapper. My bet's on the flapper.

daddyoften · February 25, 2016, 07:16:20 PM

Mine wouldn't start a month ago, just wire smoke. I find the fuel shut of valve stuck. I didn't open it up, I just tapped on it with a wrench while cranking it over and it fired right up. I need to open it up and clean it out so it doesn't do that again. Check that....
Eric

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Scott & Heather · February 25, 2016, 08:07:50 PM

Not much to these engines. Air plus fuel equals bangity bangity.

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bevans6 · February 26, 2016, 09:31:41 AM

In my experience lots of white smoke equals fuel but no air. I had the emergency stop flap on top of the blower self-deploy twice on my natural 8V-71 and had exactly this symptom.

Brian

daddyoften · February 26, 2016, 11:16:46 AM

Generally black smoke is excessive fuel, lack of air. White smoke is plenty of air and lack of fuel. Blue and grey wet smoke are bad! Lol
But that's just my experience.
FWIW
Eric

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Lin · February 26, 2016, 12:03:07 PM

I don't for sure if it is the emergency shutoff flap, but I would certainly say that that has to be the first thing to disqualify.

luvrbus · February 26, 2016, 12:26:59 PM

What if he has no emergency stop not all 71 series were equipped with the emergency stop