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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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Old 10-07-2011
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dackerman dackerman is offline
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Default Engine will not start

I've spent the last 5 hours trying to get the coach started. It seems like a fuel issue so I've replaced primary and racor fuel filters. The racor was not full when I pulled the filter out.

Now for the fun part. I'm backed into a parking spot at a storage facility so I don't have full access to the engine compartment. I was barely able to get enough space to change the fuel filter. Any ideas on how to troubleshoot/correct this situation?

Thanks,
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Old 10-07-2011
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Dan,
Is there some chance your engine kill solenoid is frozen open? Look at the top rear of the engine, about eye level. There is an air solenoid with attached airline with a piston which pushes an arm on the top of the fuel pump. The piston is about 1" long and the arm about 1 1/2" to 2" long. That arm, when rotated, will kill fuel to the engine and also cause it not to start. Is the piston engaged and making contact with the arm?

I used marvel mystery oil to free up mine after it had stuck and I couldn't start the engine.

I'll dig around the site and see if I can't find a picture of the solenoid and kill switch arm.

Doug
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Old 10-07-2011
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Dan,
Here is a picture: http://www.wanderlodgeownersgroup.co...4&d=1284386682
Look in the top right quadrant of the photo. You can see the piston extended pushing on that arm. The arm has a 90 degree bend to it. On the backside of the solenoid, there are some air fittings.

Doug
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Old 10-07-2011
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Dan,

Since there was air in the racor, there is also air in the system,
find the electric fuel pump in the rear and /or a hand pump in the engine compartment, jumper 12 volts to the fuel pump or hand pump the fuel lines, should be a T valve on the injection pump open it until fuel spills under the bus onto the ground. then crack a few injectors & release the air, until the fuel runs clear with no bubbles. at least three or four injectors. Then try to start.
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Old 10-07-2011
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I can barely see the cut off, but it looks extended. I can't get the the fuel pump because I can't open the rear engine compartment door. Someone at the storage lot parked a foot behind me.

Assuming it is air in the fuel lines, will it bleed out if I keep trying to start the engine?
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Old 10-07-2011
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If the cutoff is extended, it won't start.

I don't think there is an electronic pump on these engines. Thought all the fuel is pumped through mechanically. Also, the detroit 2-stroke engines use fuel to cool the heads, so warm fuel is cycled through at a tremendous rate and returned to the tank. I believe air would be bled very quickly. As I understand, this is a different system than the CAT 3208 engines.
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Oh yeah, my cutoff is attached to its mounting point on two bolts threaded from the top. I think 1/2" or 9/16" heads. You could remove the assembly if you can climb in and access those bolts from the side via the battery area?

Doug
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Old 10-07-2011
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Quote:
Originally Posted by Bill Pape View Post
Dan,

Since there was air in the racor, there is also air in the system,
find the electric fuel pump in the rear and /or a hand pump in the engine compartment, jumper 12 volts to the fuel pump or hand pump the fuel lines, should be a T valve on the injection pump open it until fuel spills under the bus onto the ground. then crack a few injectors & release the air, until the fuel runs clear with no bubbles. at least three or four injectors. Then try to start.
Dan,

Sorry to mis lead the thread, I read 35' and assumed it was an FC , the about instructions are for a 3208 FC not a DD, PT, But there may still be air in the fuel line.
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Old 10-07-2011
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one other idea. A good rap on the solenoid my release a stuck piston if it is preventing the engine from starting. I believe a spring retracts the piston. Squirt some penetrating oil and then a good rap with a plastic mallet might work?

I built a marvel mystery oil injector that I will use once a year per Randy's suggestion.
After lubing up that solenoid last Summer, mine hasn't stuck since.

Doug
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Old 10-07-2011
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I had a similar problem 5 years ago when we started fulltiming.
We were in Elko, Nevada when it happened.
Engine cranked, but didn't want to start.
Had a diesel guy come out and he found that the aluminum ball in the Racor had jammed up tight and starved the filter for fuel.
The O ring was floating around in the fuel.
He dropped the bowl and and fixed the problem in 10 minutes.
Could this be your problem?"
I dunno, just food for thought.
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