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#1
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85 300D oil pressure!
my 300D incessantly leaks oil through every seam on my camshaft cover.
i replaced the gasket, but eventually i get oil blowout from the gasket, the filler cap, even the air filter hose. im wondering if the pressure is too high. i leak a few drop to a splash every where i go.. any guesses? |
#2
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Blowby?!
I'm not an expert, but I'd guess you have a lot of blow-by gases built up in the crank case. Maybe a sign of worn rings... With the engine running (idling) carefully openup the oil filler cap - I mean carefully!!!! In your case it may be trying to fly off... so be forewarned.
Others may suggest more checks.
__________________
1987 Mercedes 300SDL; SOLD 1985 Mercedes 300D; SOLD 2006 Honda Pilot - wife's ride; 122K; 1995 Toyota Land Cruiser - 3X locked; 182K |
#3
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^Agreed and how much oil is in it?
__________________
83 SD 84 CD |
#4
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oil leak
i usually read about a quart lower than normal...
is there any other place that might allow pressure to build up? the air intake, or maybe oil return, or just a clogged oil filter? |
#5
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How's your PCV system?
__________________
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 |
#6
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pcv system
im not sure how my pcv system is. what should i be looking for? oil separator trouble?
the haynes manual says" the pcv system is virtually maintenance free" alternatively, could the vacuum diaphragm on my egr valve give me oil around the cam cover gasket and in the air filter? thanks |
#7
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The PVC system on my 84 300d consist of a Hose coming off the Valve cover going into an Oil Separator in the Air Filter Housing. The Blowby gets sucked into the air intake while the oil goes into the separator and is supposed to go back to the crankcasel.
While amost maint free the hose can become restricted due to crap build up andyou cannot defy physics. The hole in the Valve cover that the Hose attaches to is less han 1/2 inch in diameter. Only so much volume of Blowby can pass through that hole. If there is too much Blowby volume to pass through the hole the crankcase pressure will rise. If that pressure is not relieved it will start looking for an easy way to get out and start pushing the Blowby out from under things. My Father owned a gas engined Car that had worn Exhaust Vlave Guides/Stems. If you did not drive the car without the Oil filler/breather cap off it pushed Oil out from between the Oil Pan Gasket; resulting in a big mess. What can you do about it? Make sure your Hoses are un-restricted. Inside of the top of the Valve Cover is a baffle to help keep the liquid Oil from being pulled in easily. Check that to be sure it is not plugged. If the Blowby is being caused by worn Piston Rings the only cure is an Engine Overhaul. If sticking Piston Rings it may be possible that Marvel Mystery Oil could unstick them as per this thread. However, be sure to avoid any sort of hydraulic lock by allowing time for the Oil to pass by the Piston Rings and crank the Engine without the Glow Plugs or Injectors on so as to blow out any excess Oil. Compression Test...how low is low..... If it is worn Valve Guides/Stems with the exception of replacing the Valve Stem Seals the only cure is to rebuild the Cylinder Head. Note: Replacing the Valve Stem Seals on my Fathers car would not have helped as they were just little rubber umbrellas with a hole to slide over the Valve Stem; designed to deflect Oil away from the Valve Stems. On the Mercedes they are actually real seals. However, new seals may not work if the Valves can be wiggled sideways too much due to wear. But, at least the Valve guide seals cost around $25.
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84 300D, 82 Volvo 244Gl Diesel |
#8
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if it was the case that i have worn piston rings, wouldn't i notice a loss of power or efficiency: im still getting 26+ mpg with fine acceleration...
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#9
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My guess is a lot of blowby, but theres no harm in checking the pcv. It doesn't matter where the blowby is coming from in the case of oil leaks and blown out gaskets. The pressure is definitely not too high, the oil pump is operated by the timing chain, it's impossible to put out too much pressure.
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1983 240D 3.0T 4-speed manual, now sold 1989 Subaru GL Wagon 5-speed Touring Edition |
#10
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Run it a quart low
Quote:
I had some similar issues and here's what I found:
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Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html |
#11
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Quote:
The oil filter cap will leak unless the gasket is relatively new. The air filter hose can also leak if it's old........needs a good grip and a good clamp to avoid any slight bit of oil. |
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