Question about 2003 Mercedes-Benz C-Class

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My car needs rear main seal replaced, upper oil pan resealed, valve cover gaskets and wiring repair and bulbs. I have less than 60K miles on this 2003 C240. What should I fix first?

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  • Mercedes-Benz Master
  • 14,036 Answers

Fix what is causing you more trouble.

Posted on Apr 17, 2009

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1 Answer

1999. How can I replace front diff seal?


on the actual front diffr, pinion or the front transfer case seal
the front seal is like the rear.
its a crush cage.
that means when you remove the pinion yoke/flange big bolt
the crash cage is destroyed. also wrecking pinion gear to ring gear back lash..oops.. big big mess-up there...$$$$$$
and such cage must be replaced.
questions????????????
how can you be sure its leaking, when the engine this old loves leak oil

i bet that oil on the ground does not small at all like the nasty stink of hypoid GL5 gear lube. I BET

why not post how to find leaks first
and not do $1000 damage

no engine size posted G16? J20?>
The G16, ill demonstrate (coin toss)
Distributor 2 , o-rings leak like made, all do this old !!!!
same with the 60k mile service and valve cover gasket
all leak, for that reason alone, on all 1990s era
next is cam seal
crank seal
pan seal (or pan is rusted thru as many see (today)
oil pump seal
and gawd forbid the rear main seal , engine.


easy peasy japanezzy

why not ask your mechanic to sniff that oil first and save a fortune
guessing.
!!!!

see man pulling axle to remove pan
wana do that?
http://www.fixkick.com/axles/Pan-drop/pandrop.html

to replace this seal, remove the carrier first
then take it to a shop that can rework the carrier
the correct way.

Jan 25, 2016 | Geo Tracker Cars & Trucks

1 Answer

Oil leak? pan or valve cover? placed cardboard template under oil pan-shows oil all over area template?


there are only but a few leak points, on this water cooled engine.
  1. valve cover gasket tops list.
  2. the 2 distributor o-rings, leaks down bell housing.
  3. or the distributor base housing not mounted and sealed by the book. (need book?)
  4. front cam seal (cover off look)?
  5. front crank seal (or the bolt was never set to 94ft/lbs, torque. 17mm head bolt.
  6. pan never leaks its glued on day one in the Cami factory with RTV, unless prev. owner fiddled with it. (new oil pump done wrong)
  7. last it the rear oil seal, rear to leak.

there are only 2 way sto find leaks, get it clean, drive short distance.
see what leaks.
or
use the dye kit, a kit with UV lamp and dye, pack.

id do a #! valve cover, the 60k mile inspection , adds one, and most of these cars get on 60k service, ever , so the gaskets are all hard.
and useless on every one ive ever seen.

see oll behind here>?
http://www.fixkick.com/t-belt/sneak-a-peek.html

Mar 14, 2015 | 1997 Geo Tracker 2 Door

4 Answers

Oil leak on driveway coming from front of engine


Dear Sir,
Here is the oil leaking Problem Identifying Technique

Engine oil leaks from the valve cover gasket are common.

  • The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.
  • External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.
  • Engine oil leaks at the distributor can be misdiagnosed as leaks from theintake manifold seal, oil pan gasket, or rear crankshaft (rear main) seal. A revised distributor is available if oil is found inside the distributor.
  • If the oil filter casing shows signs of distortion from excessive oil pressure, theoil pump should be replaced.
  • Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.
  • Carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

  • I think it helps to analyse u r Problem

    Nov 02, 2012 | Toyota Cars & Trucks

    2 Answers

    What would cause an oil leak at the rear of my 2003 Chevy S-10 With 2.2L eng.?


    oil pan / rear main seal / head / valve cover
    more then likely rear main

    Jun 26, 2011 | 2003 Chevrolet S-10

    1 Answer

    I have a 2003 BMW 325i. We had the oil changed and had discovered a drop of oil under the car the day before. The repair shop replaced our oil pan plug because it was cracked. Today we have 5 or 6 drops...


    It could well be a PVC valve. The PVC plumbing on e46s is not one of BMW's best designs, and it needs to be cleaned out every 100k miles if not sooner.
    Not likely a rear main. I have never seen a failed rear main seal on a 6 Cyl BMW.

    Are you sure it is not power steering fluid? I would be surprised if a 2003 were not leaking a little power steering fluid by now if the hoses have not already been replaced.
    Another common oil leak is the hose that feeds oil to the VANOS.
    If the leak is toward the rear of the engine, I would look for a valve cover gasket leak.
    The service engine soon light is almost certainly unrelated to the oil leak.

    Feb 02, 2011 | BMW 325 Cars & Trucks

    1 Answer

    I have a 2006 Pontiac Grand Prix, it is supercharged 3800. I have about 115,000 miles on it and I change the oil every 3,000 miles, check fluids, regular preventative maintenance, etc. I noticed a small...


    If it's oil, it's coming from the rear main seal.. I would go with this idea.

    The seal doesn't cost much but the labor to get to it does.

    To give you an idea what is involved the procedure is illustrated below from the service manual:

    Removal & Installation 3.8L Engine To Remove:
    1. Drain the engine coolant.
    2. Drain the engine oil.
    3. Remove the oil pan.
    4. Remove the engine flywheel.
    5. Remove the rear oil seal housing and gasket. Rear seal removal 3.8L gm-03-38-1175.gif

    6. Remove the rear main seal by placing the housing face down on 2 blocks of wood. Using a drift tool and hammer tap the seal out of the housing.
    To Install:
    NOTE: Do not lubricate the rear main oil seal or the installation tool. Do not touch the sealing lip of the rear main seal once the protective sleeve is removed.
    NOTE: Use a clean lint free cloth to clean the crankshaft sealing surface. Remove sharp edges or burrs that could damage the rear main oil seal. Remove burrs or sharp edges with a crocus cloth.
    1. Carefully remove the rear oil seal from the protective sleeve.
    2. Install the oil seal onto the seal driver EN-47623 or equivalent by placing the seal at an angle and twisting until it is fully seated.
    3. Install the seal into the housing using the seal driver EN-47623 or equivalent and driver handle J-8092 or equivalent. Apply downward force until the seal is seated. NOTE: Ensure that the housing gasket is installed correctly and that the oil passages are not blocked.
    4. Using a new gasket Install the rear oil seal housing on the engine being careful not damage the rear main seal. NOTE: The plastic inserts are used in production and are not needed for assembly.
    5. Hand tighten the bolts. Rear seal housing alignment 3.8L gm-03-38-1176.gif

    6. Place a straight edge on the crankshaft rear oil seal housing flange and the engine block oil pan flange. Using a feeler gauge check that there is no more than .0004 in (0.10 mm) step on each side. Rotate the housing to make the steps equal on both sides.
    7. Tighten the housing bolts 11 ft-lb (15 Nm) plus an additional 50 degrees.
    8. Ensure that the housing did not move out of specification. Repeat step 6 if the oil seal housing is not within the specified range. Replace the rear oil seal housing if the specified measurement can not be reached.
    9. Install the flywheel.
    10. Install the oil pan.
    11. Fill the engine oil and the cooling system.
    12. Check for leaks
    5.3L Engine To Remove:
    1. Remove the flywheel from the crankshaft.
    2. Remove and discard the crankshaft rear oil seal from the rear cover.
    To Install:
    1. Use clean engine oil to lubricate the outside diameter of the crankshaft rear oil seal and rear cover oil seal bore.
    2. Install the tapered cone and bolts of a J 41479 or equivalent crankshaft rear oil seal installer onto the crankshaft.
    3. Place the crankshaft rear oil seal onto the tapered cone.
    4. Install the threaded rod of the J 41479 crankshaft rear oil seal installer into the tapered cone. Rear main seal installer 5.3L gm-03-53-3872.gif

    5. Install the crankshaft rear oil seal by turning the handle of the J 41479 clockwise.
    6. Remove the J 41479 crankshaft rear oil seal installer from the crankshaft.
    7. Install the flywheel onto the crankshaft.
    prev.gif next.gif--- I'm not sure what the exact cost would be as the hours were not listed for this procedure on my online resource.

    Sep 02, 2010 | 2006 Pontiac Grand Prix

    1 Answer

    Rear engine oil leak....


    Oil leak can be attributed to several factors.
    1. Gasket failure.
    2. Uncontrolled Crank case pressure Failure.

    RECOMENDATION:
    Tighten both the valve cover and oil pan bolts.
    Replace the Positive Crankcase Ventilation Valve and vacuum line.,

    INFO: PCV
    This is a valve causes a negative vacuum on the engine while its running, As to say if it had a leak in a valve cover it should not be leaking while its running, only when the engine it turned off.

    Hope this tip guides you in the correct direction to solve this problem.

    R/
    David

    Mar 05, 2010 | 2001 Nissan Frontier Crew Cab

    1 Answer

    Oil leaking in engine have replaced seal and O rings but still leaks. I am going to scream!


    ok, There are many areas that the oil could leak from. Head gasket, oil pan gasket, rear main seal, front seal, valve cover gasket. You'll need to locate the leak under the car in order to know which one to replace. There is nothing simple about replacing the rear main seal and although he front seal is easier it can still be a problem. Good Luck.

    Sep 04, 2009 | Ford Escort Cars & Trucks

    2 Answers

    Oil leak in my 98 mazda protege


    Could be a rear main seal.

    Apr 02, 2009 | 1998 Mazda Protege

    2 Answers

    Preparing a salvage motor for transplant


    4. Belt tensioner
    5. oil pan gasket
    6. valve cover gasket
    7. All other seals in timing area and cover.

    Dec 10, 2008 | 1996 Saturn SL

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