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Have a om 460 engine on a freight liner Columbia. Spewing…

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Have a om 460 engine...
Have a om 460 engine on a freight liner Columbia. Spewing black smoke through exhaust although engine is running better than it ever Has.
Submitted: 11 months ago.Category: Medium and Heavy Trucks
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Answered in 23 minutes by:
9/12/2017
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 7,898
Experience: Shop Froeman for Freightliner Trucks
Verified

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

is this a detroit or mercedes motor???

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Customer reply replied 11 months ago
It's a Mercedes and it's actually white smoke. Truck runs like new and within an hour oil starts dripping down the exhaust manifold. What could it be? I apologize for the confusion as I am helping my uncle.
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

white smoke is usually coolant. it could be coming from ege cooler is you have an egr. it could also be a head gasket.

black smoke is usually oil related. you replaced the turbo I see. it could be egr or injectors causing this.

the leak, is it external like a valve cover???

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

pressure wash the or that side of the motor and run to see if you can pin point the leak easier

Roy

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Customer reply replied 11 months ago
We've already pulled the exhaust apart.
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

is it in the exhaust ports of the head???

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Customer reply replied 11 months ago
No we removed the exhaust manifold and all of the head ports look fine.
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

ok, then it is not internal.

your leak is external. thats why you need to power wash and then run it to determine the leak.

also, injector cups could also cause the white smoke.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

Please take a moment and rate my service 5 stars so the site will pay me for my efforts. We only get paid when you accept our answers

Roy

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Customer reply replied 11 months ago
Upon further inspection, we found oil in the rearmost exhaust port. What could cause this and what do we need to check?
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

ok

could be rings or could be bad valve guides in the head.

you can do a cylinder leak down test to check the rings.

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Customer reply replied 11 months ago
Please explain the leak down procedure
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

remove the injector. insert the tool for leak down test. it uses shop air to air up the cylinder. then watch for the loss of pressure. you will most likely see excessive crankcase pressure if you remove oil fill cap.

Roy

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Customer reply replied 11 months ago
Is this a special tool that I have to get from the dealer?
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

no, snap on, mac, cornwell, even harbor freight would have it. the dealer will have it but will be very pricy.

Roy

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Customer reply replied 11 months ago
We can't go that route because we don't have the injector puller
Technician: roybelding, Shop Foreman Freightliner trucks replied 11 months ago

you will need to get that as well.

the bot***** *****ne is this. either you have to pull the head and send it out for checking the guides or you are talking an in frame for the rings

Roy

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