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  #1  
Old 11-18-2002, 11:01 PM
Tim Kendall
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300SEL Oil Leak

I've read a previous thread about a known fix for a persistent oil leak on an 89 300SEL, but I'm still hoping I can find a leak or two without resorting to a valve job. Is there a best way to look for a leak on this 6 cyl, or is it more likely to leak from one seal or another?
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  #2  
Old 11-19-2002, 08:49 AM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
103 leak points.

headgasket
cam seal
valve cover
front upper timing cover
lower cover, bottem l/h bolt in bearing bracket. (l/h being the side as if you were sitting in the car)
front crank seal
rear crank seal
rare but, oil filter housing, oil pan
oil level sensor.



Joe
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  #3  
Old 11-19-2002, 10:11 AM
Tim Kendall
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Thanks for the list, Joe. Now, let's say I'm lazy, and I want to get the right one (most likely) first. I definitely don't want to go head gasket/valves unless I have to. I've got a good amount of oil on the right front of the engine, so I might do the cam seal just for grins. After that, is there a better way to find a leak than wipe it off and look for spots?
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  #4  
Old 11-19-2002, 07:20 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,746
Tim,

You're looking for the holy grail.

For argument's sake, my money's on the horseshoe gasket between the head and the timing chain cover. I think the head has to come off for that one.


BTW, if you're too lazy to wipe the engine and look for the source of the leak, you're really lazy

Joe,

What's a cam seal? The cam is completely inside the valve cover. How can a cam seal cause an external leak?

Sixto
91 300SE
87 300SDL
83 300SD
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  #5  
Old 11-19-2002, 07:36 PM
Tim Kendall
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Holy Grail

But still not lazy enough to take it in and write the check.
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  #6  
Old 11-19-2002, 08:19 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,746
... as that would be me

Sixto
91 300SE
87 300SDL
83 300SD
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  #7  
Old 11-19-2002, 09:08 PM
ILUVMILS's Avatar
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Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,461
Tim, replace the cam seal and U-seal. The cyl. head doesn't need to be removed, just the valve cover and distributor cap/rotor. Remove the fan too, and you'll have all kinds of room to work. The corners of the U-seal need to be sealed to prevent future leaks. Sixto, the camshaft pokes thru the front cyl. head cover. It's what drives the ignition rotor, and has a miniature kinda front crank seal(radial seal to be exact). The majority of the leak though, is most likely the U-seal. Good luck
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  #8  
Old 11-19-2002, 09:13 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,746
Gotcha. I've been spending so much time on the SDL that I forgot about the distributor. Thanks.

Sixto
91 300SE
87 300SDL
83 300SD
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  #9  
Old 11-20-2002, 10:23 AM
Tim Kendall
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Thumbs up

Many thanks Jo, Sixto, and ILUVMILS! I'm optimistic now that I can stop putting as much oil as gas into this beast without having to explain to the wife why I'm living in the garage.

(I promise to clean up after the procedure)
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