CLS 320CDI gives a lot of white smoke more than 5 minutes - Page 2 - Mercedes-Benz Forum

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post #11 of 17 (permalink) Old 02-09-2011, 06:24 PM Thread Starter
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Dear isstay, if what u said is correct, how do i fixed it before it will be getting worst? ANd also as you point out read AP4720P0780T, where can i find and read it? Thank you
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post #12 of 17 (permalink) Old 02-10-2011, 04:43 AM
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Just to clarify here (and in mitigation for my mistake!)

Not ALL MB deisel engines have a fuel filter fitted with a water level sensor.

Drawing AP4720P0780T is in the WIS (MB workshop manual) and does show this feature for MB with Code 494 (USA version)

Drawing AP4720P0780 shows the fuel filter WITHOUT a water level sensor. (no electrical connector at the top of the filter)

So what type of filter do you have? with connector or without?
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post #13 of 17 (permalink) Old 02-10-2011, 07:52 AM
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The amount of white smoke the OP described would be more than just a little water in the fuel. I'd have to guess the head gasket or even a cracked head.

Take a look at the oil on the dipstick. If cloudy, milky or foamy, then water is in there also.
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post #14 of 17 (permalink) Old 02-10-2011, 09:48 AM
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Quote:
Originally Posted by keyhole View Post
Not ALL MB deisel engines have a fuel filter fitted with a water level sensor.
Good point, the default at this forum would be the US and one could assume that from a member who does not indicate his/her location in the profile but then again, I think the car was a CLS CDI which cannot be a US car.
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post #15 of 17 (permalink) Old 02-10-2011, 10:52 AM
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Originally Posted by keyhole View Post
isstay - my sincere apologies to you Sir. You are absolutely correct, as DB has just pointed out.
Apologies accepted.
Here is some more info about it if you like, see attached files:
As is been pointed this is for US models, code 494, or U41 code, maybe for rest of the world, not sure. I saw that the car is in Bruney, but I don't know were U41 applies.
Water has lower weight than diesel, so it will stay on top of it. Soffean193 did you notice if your car smokes when you tank is full or almost empty? If it does when empty most likely will be water in the fuel. If it does when tank is full you probably have different problem. I also would keep eye on coolant level. I don’t know if you install one of those filters with water separators how will work for your car. Maybe will be fine but you will have to check it manually for water levels and empty it since it is not going to alarm you, maybe will create back pressure on the fuel pump inside the tank and trigger some error code.
Attached Files
File Type: pdf fuel filter1.pdf (294.4 KB, 71 views)
File Type: pdf fuel filter2.pdf (380.0 KB, 65 views)
File Type: pdf fuel filter3.pdf (442.8 KB, 57 views)
File Type: pdf fuel filter4.pdf (419.7 KB, 68 views)

Last edited by isstay; 02-10-2011 at 11:01 AM.
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post #16 of 17 (permalink) Old 02-10-2011, 10:55 AM
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Originally Posted by gforaker View Post
The amount of white smoke the OP described would be more than just a little water in the fuel. I'd have to guess the head gasket or even a cracked head.

Take a look at the oil on the dipstick. If cloudy, milky or foamy, then water is in there also.
It is very rare for the head gasket to blow in both directions: to the oil and to the coolant passages. Although it may happened some time. He most likely does not have dip stick ,but will get a warning about oil level to high and needs to be drained.

Last edited by isstay; 02-10-2011 at 11:03 AM.
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post #17 of 17 (permalink) Old 02-10-2011, 11:11 AM
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Originally Posted by soffean193 View Post
Dear isstay, if what u said is correct, how do i fixed it before it will be getting worst? ANd also as you point out read AP4720P0780T, where can i find and read it? Thank you
Only way to fix head gasket is to replace it, hope this is not the case, it is $$$. In my opinion sooner is better, because if it blows trough the oil passage it may cost you even more. Don't know anything about AP4720P0780T, but look at the PDF's that I attached, if this will help you. With small gasket hole car will smoke when is cold more than when warms up (gasket will expand), but eventually will get worse.

Last edited by isstay; 02-10-2011 at 11:19 AM.
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