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Old 04-26-2010, 04:49 PM   #1
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A bit of smoke @ start up for Cat 3176 = normal?

20 year old coach

89k miles

Engine Oil analysis = green check mark = all normal

Is it normal to see a bit of smoke @ start up?
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Old 04-26-2010, 09:40 PM   #2
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Blue or black?
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Old 04-26-2010, 10:09 PM   #3
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We have about 108K miles on our 3126B and I see a little black smoke on startup when the engine is cold. Once its warmed up, no smoke on starting. Oil analysis shows no problems. I've always thought it was normal.
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Old 04-27-2010, 08:13 AM   #4
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Blue or black?

well its not black.... and there is no smoke during operation. and very little at start up but there is some
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Old 04-27-2010, 01:34 PM   #5
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I little blue smoke is OK, a real lot can be trouble such as valve guide seals or turbo seals. White smoke can be water in the fuel. Black smoke is unburned diesel with a cold motor. You said it wasn't black so it is ether blue or white. If it is below 40-45* you will probably get some blue smoke on startup and for a few minutes. 89,000 miles is nothing on a diesel motor. The oil analysis will only tell you if there is water in the oil. The mechanical injection diesels smoke more than the later electronic injection diesels. The big question would be how much oil you are using while driving. A quart every thousand miles is normal.
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Old 04-27-2010, 02:22 PM   #6
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I little blue smoke is OK, a real lot can be trouble such as valve guide seals or turbo seals. White smoke can be water in the fuel. Black smoke is unburned diesel with a cold motor. You said it wasn't black so it is ether blue or white. If it is below 40-45* you will probably get some blue smoke on startup and for a few minutes. 89,000 miles is nothing on a diesel motor. The oil analysis will only tell you if there is water in the oil. The mechanical injection diesels smoke more than the later electronic injection diesels. The big question would be how much oil you are using while driving. A quart every thousand miles is normal.
I believe the Cat 3176 is the "1st" fully electronic unit cat made.... so it is not mechanical.... and I will check for sure next time i start it up to make sure its not blowing smoke and the exact color. thanks for the help!
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Old 04-30-2010, 08:23 AM   #7
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Quote:
Originally Posted by Mike Canter View Post
I little blue smoke is OK, a real lot can be trouble such as valve guide seals or turbo seals. White smoke can be water in the fuel. Black smoke is unburned diesel with a cold motor. You said it wasn't black so it is ether blue or white. If it is below 40-45* you will probably get some blue smoke on startup and for a few minutes. 89,000 miles is nothing on a diesel motor. The oil analysis will only tell you if there is water in the oil. The mechanical injection diesels smoke more than the later electronic injection diesels. The big question would be how much oil you are using while driving. A quart every thousand miles is normal.
Ok we started the big coach up cold yesterday afternoon in the warehouse.... with some light shining on the exhaust. At startup, a very transparent 'grey' colored fog (cloud) of smoke comes out innitially (cold start up) then goes away pretty quick.

The guy I work with thinks its normal? My oil pressure runs about 45 lbs cold and 40 lbs in final gear, warm, going to freeway. Oil analysis looked good.
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Old 04-30-2010, 08:28 AM   #8
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I would say that is 100% normal. I think you should stop worring about. I see that on my Detroit Diesel with 25K miles on it. My old MH with a Cummins B5.9 with a 125K was about the same also.
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Old 04-30-2010, 09:17 AM   #9
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I would say that is 100% normal. I think you should stop worring about. I see that on my Detroit Diesel with 25K miles on it. My old MH with a Cummins B5.9 with a 125K was about the same also.
Mike thanks for your 'gut' feel advise. Can you tell me if you think my oil pressure is normal? I'm pretty sure the VDO gauge is accurate.
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Old 05-02-2010, 05:29 AM   #10
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Yes, the oil pressure looks normal.
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