So last night started getting ready for a trip to Arizona and started the 2001 American Coach Tradition and when I walked outside of the coach, diesel fuel on the ground. As I looked further I noticed the ground looked like the engine just spit it out all over in the area of the engine where it marries up to the transmission. Started wiping down to see if could identify where leaking originated and it is above what looks to be the alternator/generator and couldn't see more because of darkness and now I am at work. Spartan Chassis and it is behind the rear tires almost in the middle but a little more passenger side. Anyone know what might be above or a good mobile diesel mechanic in Corona area of California?And then as I am wiping everything down I noticed that there is a threaded opening at the bottom of where the engine marries up to the transmission and I think I saw something spinning inside and can't believe that it would just be left uncovered. I should add that there is some kind of loom (unknown if wire or hose) that is nearly blocking my view of this opening. Does this sound right?And last question relates to an ongoing issue with the refrigerator. Works like a charm on LP. When I set it to auto and am hooked up to electricity, switches to a/c for a while then back to LP and says no a/c. I have found a fuse in the refrigerator compartment (1 amp I think) that restores a/c to fridge, but then blows again not too long later. Any suggestions on where to start?New to me coach from my father that had a personal mechanic do all his work and now since mine, trying to do most myself. Thanks for any input!Engine - Cummins® C.8.3 Liter, 315 hp ISC Diesel, Transmission - Allison® 3000 MH 6-Speed Automatic on a Spartan Mountain Master Chassis.

In regards to your second paragraph, that sounds like the opening for the barring tool. It's a place where a simple tool that goes on the end of a ratchet is used to manually turn the engine over during valve adjustments and the like. It should either have a metal door that swings out of the way or a plastic plug. If it has the metal door then it may be there and just not in position or maybe someone forgot to tighten the little bolts down. In either case it should be covered. As far as the fridge is concerned, make sure there is 120VAC at the socket where it's plugged in and make sure the flue gets hots when on AC. If not then the element is probably burned out.

Thanks for the response. The opening is about the size of a quarter and threaded with no metal door cover, so I will check into a plug that must be missing. I will check where the fridge plugs in for 120 VAC. It cools very nicely, but like last night, just stops a/c and goes to LP. I did notice that the socket that it plugs into has two spots available. Does it make a difference which one I plug into?

You can use either outlet - just make sure it's live. Maybe use a lamp to check it.Here's what the barring tool looks like for your Cummins. The opening is indeed about the size of a quarter. It may be threaded so a plastic plug will screw in.

Thanks! I can't wait until I am a bit more knowledgeable about this. I can't see the picture because it says my preferences are blocking it. How I set it up to not show pictures escapes me, but I can't undo it now apparently. Thanks so much for the help. Any thoughts on the diesel leak above the generator/alternator near the frame rail?

Sorry, not much of an idea about the leak unless the fuel filter(s) (or lines going to them) that are often behind the alt are leaking. If they're in that area, I would clean off the filters and then run it to see if the fuel is coming from that area - you might even tighten them an 1/8 of a turn. If you use brake cleaner to clean up the whole area you can then sprinkle a little flour around so that the leak shows up easily.

threaded opening between Cummins and Allyson Transmission

15 Replies

ScottG
Nomad
Jul 28, 2013
Sorry, not much of an idea about the leak unless the fuel filter(s) (or lines going to them) that are often behind the alt are leaking.
If they're in that area, I would clean off the filters and then run it to see if the fuel is coming from that area - you might even tighten them an 1/8 of a turn. If you use brake cleaner to clean up the whole area you can then sprinkle a little flour around so that the leak shows up easily.
robertbenita
Explorer
Jul 28, 2013
Thanks! I can't wait until I am a bit more knowledgeable about this. I can't see the picture because it says my preferences are blocking it. How I set it up to not show pictures escapes me, but I can't undo it now apparently. Thanks so much for the help. Any thoughts on the diesel leak above the generator/alternator near the frame rail?
ScottG
Nomad
Jul 28, 2013
You can use either outlet - just make sure it's live. Maybe use a lamp to check it.

Here's what the barring tool looks like for your Cummins. The opening is indeed about the size of a quarter. It may be threaded so a plastic plug will screw in.
robertbenita
Explorer
Jul 28, 2013
Thanks for the response. The opening is about the size of a quarter and threaded with no metal door cover, so I will check into a plug that must be missing. I will check where the fridge plugs in for 120 VAC. It cools very nicely, but like last night, just stops a/c and goes to LP. I did notice that the socket that it plugs into has two spots available. Does it make a difference which one I plug into?
ScottG
Nomad
Jul 28, 2013
In regards to your second paragraph, that sounds like the opening for the barring tool. It's a place where a simple tool that goes on the end of a ratchet is used to manually turn the engine over during valve adjustments and the like. It should either have a metal door that swings out of the way or a plastic plug. If it has the metal door then it may be there and just not in position or maybe someone forgot to tighten the little bolts down. In either case it should be covered.
As far as the fridge is concerned, make sure there is 120VAC at the socket where it's plugged in and make sure the flue gets hots when on AC. If not then the element is probably burned out.

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threaded opening between Cummins and Allyson Transmission

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