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Old 01-21-2018, 03:05 PM   #1
Mini-Skoolie
 
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Chassis: Freightliner
Engine: Caterpillar 3126
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Blue Smoke - Cat 3126

It's me again, lol

I've done some research into on the web trying to figure out why my bus is exhausting blue smoke while running or pressing the accelerator, however I've not come to a conclusion that would help me fix it. I have no diesel mechanics in my area to mention this to either, so I'm asking here.

While the bus is running, after about 5 minutes, a light blue smoke will begin to exhaust and continue for the time the bus is running, and it happens when you depress the accelerator too. Can anyone make any comments as to what the most logical things are the check and replace?

I am considering flushing the oil with a higher quality oil and see if that changes anything. I want this fixed so it doesn't come to have bigger more $$$ problems.


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Old 01-21-2018, 03:12 PM   #2
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You might have a rebuild in your future:

https://www.perkins.com/en_GB/resour...lue-smoke.html

Blue smoke indicates burning oil. Usually related to top end or ring/bore wear.

How many hours on the engine?
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Old 01-21-2018, 03:20 PM   #3
Mini-Skoolie
 
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Blue Smoke - Cat 3126

Quote:
Originally Posted by Twigg View Post
You might have a rebuild in your future:

https://www.perkins.com/en_GB/resour...lue-smoke.html

Blue smoke indicates burning oil. Usually related to top end or ring/bore wear.

How many hours on the engine?


Not sure how many hours on the engine, as mine doesn't tell me that info, unfortunately. I just know it has 194k miles and was maintained every month and a half by a school district.


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Old 01-21-2018, 03:21 PM   #4
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Ok, a shot in the dark first.

What is the engine temp when warmed up during a good run? Normal on the guage?

Do you have a grid heater on that bus for the intake air? They cycle on and off depending on the temp the engine develops running normal and may kick back on when at low idle to help with combustion. Usually they shut off when the engine has reached the optimum operating temp and you have a clean burning, low smoke exhaust. Makes me wonder if it is working.
Could be low battery power too if the grid isn't heating up or just not working at all. usually a relay feeds the grid and they do expire over time.
Do you see black smoke under load?

John
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Old 01-21-2018, 03:41 PM   #5
Mini-Skoolie
 
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I don't have any black smoke, and my dad and I both have checked the batteries and they're all charged.

The temp is something else to note. It doesn't go above 125 after running about 30 minutes with high RPM. We did remove the rear heater completely, and refilled the coolant and nothing changed. But the entire bus runs so flawlessly. The exhaust is just a little worrisome to me.


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Old 01-21-2018, 04:02 PM   #6
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Normal operating temps should be 190-195, concern if over 210. I would be checking the reliability of gauges that read only 125 after running for 30 minutes.
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Old 01-21-2018, 04:37 PM   #7
Mini-Skoolie
 
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Quote:
Originally Posted by o1marc View Post
Normal operating temps should be 190-195, concern if over 210. I would be checking the reliability of gauges that read only 125 after running for 30 minutes.


I am looking into getting a newer gauge cluster, but am unsure how because of the difference in connectors. I made another post about that but am still unsure how to approach it. It doesn't seem to run hot though. Everything is so smooth


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Old 01-21-2018, 04:38 PM   #8
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125 is way low.
The thermostat might be done or stuck in an open condition. Try tapping around the housing. Wouldn't hurt to put a new one in and compare results.

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Old 01-21-2018, 04:42 PM   #9
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Quote:
Originally Posted by sean82206 View Post
I am looking into getting a newer gauge cluster, but am unsure how because of the difference in connectors. I made another post about that but am still unsure how to approach it. It doesn't seem to run hot though. Everything is so smooth


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That gauge would concern me, if it is off by 70 now, if it were to read 190, it would really be 260 and possibly leave you in a false comfort zone.
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Old 01-21-2018, 04:50 PM   #10
Mini-Skoolie
 
Join Date: Oct 2017
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Could you look at my other thread and see if you could explain how I'd go about upgrading the guage cluster?


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