Author Topic: Smoking Exhaust  (Read 2718 times)

--leXXy--

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Smoking Exhaust
« on: 04 December 2007, 07:56 PM »
Hey guys a have a beautiful Benz 450SE Auto. Whenever the car is on idle the engine gets very smoky of a blue/grey smoke. Also when i revv up my Benz to about 5000RPM a lot of smoke puffs out.
Should I have an engine rebuild? Or Change engine components. The car has done 190000kms

13B

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Re: Smoking Exhaust
« Reply #1 on: 04 December 2007, 08:10 PM »
Valve stem seals, most likely.  Nothing a competent MB mech can't do in a day, cost should be about a grand, but if you've got 190,000km on the clock, better change your timing chain and tensioners.  You'll have another 200,000km of trouble (engine) free motoring.

Welcome to the forum, btw.  You'll meet many likeminded individuals here.  Pls enjoy your stay.

I.
450SEL 6.9 #5440 = V MB 690 , 450SE # 43094 = 02010 H , 190E/turbo # 31548 = AOH 68K

Nutz

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Re: Smoking Exhaust
« Reply #2 on: 14 December 2007, 06:08 PM »
Year?

DieselDog

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Re: Smoking Exhaust
« Reply #3 on: 14 December 2007, 09:15 PM »

Yep, valve seals if smokes at startup especially.  But thats not much mileage for the 450 V-8.  How's fuel economy and whats condition of spark plugs tell you - maybe fuel fouled running rich?  Oil fouled if seals are gone and whats oil consumption rate on this engine?   Meanwhile stretched timing chain beyond 6-8 degrees will take out injector pump timing and cause lousy combustion, crummy economy, sluggish performance. 

Before considering rebuild I'd first get engine compression tested after valve adjust. This wont tell status of seals but will indicate condition of rings and valve seats.  Valve guide seals can be done without pulling the heads.

'80 300SD/ w116
'79 240D 4-spd
'71 750cc Guzzi

previously owned:

'83 240D 4-spd
'77 280SEL 4-spd
'74 280/8
'72 250/8
'65 220Sb 4-spd
'63 220Sb 4-spd
'63 190c 4-spd
'61 220Sb 4-spd
'60 190b 4-spd

CraigS

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Re: Smoking Exhaust
« Reply #4 on: 14 December 2007, 10:44 PM »
I agree that this is minimal mileage and suspect that it may have had minimal maintenance. I would also have a leak down test done. That will tell you more than a compression test. For what it will tell you, have a look here - http://autos.yahoo.com/maintain/repairqa/engine/ques057_1.html

Nutz

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Re: Smoking Exhaust
« Reply #5 on: 15 December 2007, 04:11 AM »
A vacuum gauge is your friend! No need to second guess and head scratch about whats really going on inside the engine.Very affordable and useful tool that should be in every DIY'er toolbox. Handy too when going to check out a car for purchase.


bolbol

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Re: Smoking Exhaust
« Reply #6 on: 16 December 2007, 08:21 AM »
Nutz, can you please elaborate on how you can use the vaccum gauge ?

bolbol

Nutz

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Re: Smoking Exhaust
« Reply #7 on: 18 December 2007, 02:25 PM »
Go to this site which explains it pretty well and scroll down to this image below



and click on it and it will give you various scenarios and their meaning on the vacuum gauge.