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#1
03-13-2010, 08:08 PM
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Smoke from valve cover
84 300d:
How much smoke(oil vapor?) should come out of the oil fill on the valve cover with engine on and @ operating Temp.? I assume most of it comes from the breather hose via PCV? 
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#2
03-13-2010, 08:10 PM
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As long as your oil cap doesn't fly off the valve cover when you loosen it you'll be fine.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#3
03-13-2010, 08:13 PM
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Very short answer: Search "blowby"
Longer answer: There is a method documented in some thread around here about using garbage bags and a stopwatch to measure the blowby of the engine at idle. I don't have the specifics of it, but I'm sure you can find it if you really want to. I'm satisfied with the amount of knowledge gained from the "tea kettle test". In this one, you undo the oil filler cap and leave it sitting in its hole while the engine is running. If it sits there without moving, you've got a very tight engine. If it dances around on the valve cover, you're still ok. If the oil cap blows off, your engine is probably pretty worn.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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#4
03-13-2010, 09:35 PM
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Quote:
What is documented is that the Factory mentions in the FSM a machine for measuring that blowby and gives a go no go figure.. the garbage bag discussion was pretty much in jest.... or should be considered in jest as it was never correlated with what that machine said was ok or not...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#5
03-13-2010, 10:01 PM
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In re-reading those threads, you're right, they only contain data points for a pair of 603s and a pair of 617s. Yes, there is a factory tool, but does anybody actually have one? I don't think a precise measurement of blowby is particularly important anyway, hence sticking to the tea kettle test. A compression test is much more informative.
BTW, in high school I had a 351 Ford with blowby so bad it would push oil out the dipstick tube. I drove it like that for over a year before it finally quit. http://www.peachparts.com/shopforum/showthread.php?t=193500 http://www.peachparts.com//shopforum/showthread.php?t=193602&highlight=blowby+garbage+bag
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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#6
03-13-2010, 10:04 PM
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I totally agree that a precise measurement of the blowby is not particularly important.. just failed to mention it in my last post..
Just did not want the garbage bag post to get into urban myth status....LOL
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#7
03-13-2010, 10:05 PM
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It seems kind of fun though. Depending on how busy I am, I might do my 617 tomorrow just to see what happens.
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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#8
03-14-2010, 12:49 AM
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So... when you guys open your cap at idle, hot... do you see billowing clouds, or a light fog?
I know there is a lot of theory and discussion on this, but how bout an easy answer?
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#9
03-14-2010, 11:44 AM
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Light fog.
Unless you can actually measure it, it's a guess.
__________________
83 SD 84 CD
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#10
03-14-2010, 12:06 PM
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The easy and CORRECT ( LOL) answer is to ignore it..
if you are worried for some reason about your engine do a compression test and a leakdown test... lots in the archives on how to do that pretty cheap... Also, renew that gasket on the offending cap.... and when you look in there to smell the oil mist do not turn that cap upside down... because then oil will run out on top of the valve cover and you will be even more convinced something is wrong.
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#11
03-14-2010, 12:10 PM
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Quote:
Let us know all the specs...
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#12
03-14-2010, 01:41 PM
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Quote:
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#13
03-14-2010, 02:10 PM
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Quote:
Thanks for all the responses 
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#14
03-14-2010, 05:54 PM
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If there are vacuum problems and excessive blowby, then the vacuum lines and booster are the first places to look, especially if the engine starts and runs fine. For a quick test, disconnect the union on the pump hard line before the barbed fitting and plug it on the pump end. If your blowby decreases greatly, the issue is not an internal one.
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#15
03-14-2010, 06:59 PM
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Quote:
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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