Question about 1998 Mercedes-Benz S-Class

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1998 S320 transmission filter change - 1998 Mercedes-Benz S-Class

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  • Anonymous Mar 21, 2009

    I can't find where to add the trans fluid! I know there is no dip-stick since you have to take it to a dealer. But, I am just curious where it is located.

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Step1 Allow the Transmission to cool down, if possible, to avoid high heat from the fluid as well as from the catalytic converter. Insert the intake hose of your Siphon Pump through the dip stick tube to the bottom of the drain pan. Siphon off as much fluid as you can. You will appreciate this later! If your Transmission has a drain plug, you can elect to omit this step. Step2 Raise the vehicle on a lift, for easy access. If necessary, remove any cross members blocking access to the pan or pan bolts. If you are unable to do this, loosen the Transmission mounting bolts at the tail stock, and gently raise the Transmission to gain access. (see warning below) Step3 Remove the pan bolts, leaving two in place on opposite sides. Slide your oil drain/reservoir into place and top it with a wide catch pan. Back the remaining bolts out halfway. Use your putty knife to separate the pan and gasket. Then, remove the last two bolts and carefully lower the pan. If you find a plastic cap inside of the pan, you will know that you are the first one to remove it since it was factory installed. Step4 Remove the retaining clip or bolt holding the filter in place. Check the filter stem to be sure the old O-ring seal came out with it. If not, be sure to locate and remove it. Take a shop rag and wipe down the valve body to remove any remaining fluid and sediment. Install the new O-ring seal & filter from the kit, wet the O-ring with clean fluid, install the filter and secure it in place. Step5 Clean the pan of fluid and sediment. If it has a magnet, clean it too. If not, install one, being sure that it won't be in the way of the filter pick-up. Use your putty knife and blade scraper to remove any old gasket material from the pan as well as from the Transmission mating surface. Step6 1998 S320 transmission filter change - peen_thumb.jpg Transmission oil pan Peening the pan.
Chock your deep well socket into the end of your table vise. Use a short extension to gain clearance, if necessary. With the pan in the upright position, carefully center a bolt hole over the socket. Place the ball end of one hammer into the bolt hole and tap the face end with the other hammer. What this does is to create a slight concave curve which will spread the pressure of the bolts to assist in an even seal of the gasket. If you are the first to remove the pan, this step shouldn't be necessary. Step7 permatex_thumb.jpg Pan gasket Apply a thin/even bead of Permatex to the lip of the pan, being sure to circle all of the bolt holes. Carefully apply the new gasket. Flip the pan over onto a clean/flat surface and apply light/even pressure to seat the gasket. If you have the time, allow the Permatex to cure with the pan in this position for at least 10 minutes. Step8 Remove any Permatex that may have oozed into the bolt holes, before reinstalling the pan. Start the bolts by hand, to avoid cross threading. Tighten the bolts, in a zig-zag pattern, to the recommended torque. Step9 Reinstall any cross members or Transmission mounts previously removed. Lower the vehicle from the lift. Step10 Add about half of the recommended fluid then check the cold level on the dip-stick. Keep in mind that some of the old fluid most likely remained in the torque converter, unless this was an off-vehicle replacement. Add the remaining fluid, checking the level frequently. Step11 Once the cold level is reached, start the engine. Place the Transmission in drive, with the parking brake set, and allow the vehicle to idle until operating temperature is reached. Shift the Transmission through all gears then into park, before rechecking the level. If the level is over the hot mark, use the Siphon pump to remove the excess. If it is low, add the necessary amount.

Posted on Feb 26, 2009

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