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Old 06-09-2015, 11:30 AM   #11
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Location: Rhode Island/Nicaragua
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Year: 1997
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Engine: CAT 3126 7.2L
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I probably won't get to work on the bus until Sunday but I'll try and Check the coolent and oil level tonight. Has anyone used a remote OBD-2 adaptor on a 3126? Any idea one how much info it provides and wither or not it may be able to help diagnose this problem and others in the future?
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Old 06-09-2015, 11:51 AM   #12
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OBD-2 is a passenger car standard. Medium duty trucks like our buses use the J1939/1708 protocols. If it has the data port.
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Old 06-09-2015, 12:02 PM   #13
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Thank you scooter. I'm leaning a lot here.
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Old 06-09-2015, 12:09 PM   #14
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Thank you scooter. I'm leaning a lot here.
This is definitely a learning resource, and we can all share our common experiences. But listen to folks like Cowlitz- people in the industry- when they offer advice. Even if/when I start having problems that I can't figure out, I'll probably be taking my bus to the local truck shop to get looked at
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Old 06-09-2015, 07:35 PM   #15
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Is it pure white or blueish? Could be an injector.
Does it smell like coolant.
your right a injector will give the same signs as a blown head gasket, one other thing, if the gasket is gone there should be signs of over heating.
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Old 06-10-2015, 10:35 AM   #16
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The oil and coolent levels look the same as before the 45min drive home. I would think the coolent level would be significantly lower if it was leaking through the combustion chamber. Also the engine temp stayed steady at 2/3 of temp gage range. I did notice the oil pressure fall maybe 10lbs or more when the smoke starts. That may just be the simalar affect of removing your foot from the throttle. I leaning back towards a fuel delivery problem.
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Old 06-10-2015, 06:00 PM   #17
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The oil and coolent levels look the same as before the 45min drive home. I would think the coolent level would be significantly lower if it was leaking through the combustion chamber. Also the engine temp stayed steady at 2/3 of temp gage range. I did notice the oil pressure fall maybe 10lbs or more when the smoke starts. That may just be the simalar affect of removing your foot from the throttle. I leaning back towards a fuel delivery problem.
It does sound like a injector problem, those engines are know for blowing the tips off the injectors, but they are know to break piston rings, and blow head gaskets.
if it was me, I would start by removing the injectors, you can have them tested, the oil seals go bad and cause blow by. when there out you can do a compression test as well. I had lots of smoke and it was light blue/white, I replaced all 8 injectors, all is good.
but you really should take it to a shop if your not sure, its costly to replace them and its not the problem.
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Old 06-13-2015, 08:50 AM   #18
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I think at this point I will pull all the injectors and have them cleaned and tested for $35 each and replace any with rebuilt if the are found to be bad. If all are good then I will continue on with pulling the head. I haven't read into the head gasket procedure yet but I would assume that pulling the injectors is part of the procedure. In the end I must know this bus intimately before our journey begins. Once I cross over to Mexico the roads are steep, ruff and often remote on our way through every Central American country on our way back to Nicaruaga.
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Old 06-13-2015, 09:02 AM   #19
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Although, finding a bus mechanic in Central America is easy considering that almost everyone uses public transportation and the only public transport down there are our retired school buses. Driving a personal Skoolie down there is like driving a newer custom Coach up here. If you have a problem there will be plenty of help to get you back on the road but at a price. If you know what your talking about you are far less likely to pay for something that didn't need repair. I.e. Pay for a new injector if all they did was rinse out the fuel filter or water separator. (Not even replace it)
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Old 06-13-2015, 10:13 PM   #20
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I think at this point I will pull all the injectors and have them cleaned and tested for $35 each and replace any with rebuilt if the are found to be bad. If all are good then I will continue on with pulling the head. I haven't read into the head gasket procedure yet but I would assume that pulling the injectors is part of the procedure. In the end I must know this bus intimately before our journey begins. Once I cross over to Mexico the roads are steep, ruff and often remote on our way through every Central American country on our way back to Nicaruaga.
$35.00 to clean and test. that's they way to start, and a good price, I'm sure they would replace the o-rings too, hopefully this is all it takes care of your problem.
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