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Old 08-23-2018, 05:09 PM   #1
Mini-Skoolie
 
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Bus wont start

2002 thomas safety bus

So it's been a while since I started the bus last, kind of took the summer off from the build. So its probally been a month since i ran her last and now today i go to start her and she cranks but wont start battery is fully charged. I'm in no way a mechanic and was wondering if there anything obvious i check for before i go and call a mechanic to come out here and try and figure it out. It's in neutral all emergency exits are closed nice and snug. Any ideas fellow bus people??
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Old 08-23-2018, 05:20 PM   #2
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Year: 2002
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Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
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Does it crank and not start or fail to crank?
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Old 08-23-2018, 06:20 PM   #3
Mini-Skoolie
 
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It cranks but fails to start
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Old 08-23-2018, 06:40 PM   #4
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Engine: T444E 7.3L
What engine is in it? Fully charge the batteries and crank on it for 10 second intervals giving the starter a break between cranks. Maybe lost it's fuel prime depending on engine.
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Old 08-23-2018, 07:07 PM   #5
Mini-Skoolie
 
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It's got a cat 3126 I'll give that a shot tommorow
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Old 08-23-2018, 07:24 PM   #6
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Year: 2002
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Quote:
Originally Posted by Kdebo View Post
It cranks but fails to start
Somehow I overlooked that in your original post. Sorry 'bout that.

Did anything else change? New fuel filters etc?
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Old 08-23-2018, 07:26 PM   #7
Mini-Skoolie
 
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No nothings changed the bus has literally been sitting in my backyard for about 3 months now. I'm kind of getting the feeling I might have done critters causing damage maybe
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Old 08-23-2018, 07:33 PM   #8
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Year: 2002
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Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Hmmm...

A diesel engine needs air, fuel and compression to start.

I can't conceive what could keep it from getting air. A sudden loss of compression from sitting idle seems unlikely. That leaves fuel.

As yours is an electronic engine it could be either an interruption in the fuel supply or an electrical/computer problem in the fuel injection.

Not being very well versed in CAT engines I will defer to our resident CAT guru's. Where would you be looking for fueling issues on this engine?
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Old 08-23-2018, 08:00 PM   #9
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No guru and not familiar with these engines. This is a common issue when diesels sit idle for months. I agree with the priming because the high pressure pumps have internal check valves that sometimes leak or stick from sitting. Filtered diesel can be dirty too when it sits and doesn't get burned. That dirt affects the operation of that pump. Also check water separator before trying again and drain. Charge the batteries up good, you been taking them down trying.


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Old 08-23-2018, 08:04 PM   #10
Mini-Skoolie
 
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When you're cranking it over watch to see if you got a little bit of white smoke and if you are it should smell a bit like diesel that means you're getting fuel and if it won't start you need to start looking at whether or not the glow plugs are getting power the CAT engine is a glow plug engine and sitting can build up little bit of corrosion on the relay contacts what do a little bit of research into how to diagnose glow plugs for your motor there's lots of info out there on them and it is a fairly simple electrical circuit
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