How to stop a leak in a manual transmission

Written by judy kilpatrick Google
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How to stop a leak in a manual transmission
Prevent transmission breakdowns by stopping transmission fluid leaks. (Jupiterimages/Comstock/Getty Images)

Transmission leaks may lead to serious problems for your automobile. Manual transmissions are not forgiving of low fluid levels, and will malfunction within a short time when the fluid levels drop too low. The major causes of transmission leaks are loose nuts and a loose transmission pan or dried out gasket seals. Stop-leak transmission fluids may be useful for your manual transmission, as they condition and repair leaky seals. However, manual transmission fluid leaks are more often caused by loose fittings.

Skill level:
Moderately Easy

Things you need

  • Model specific transmission fluid
  • Fluid pump
  • Container
  • Jack or ramp
  • Ratchet
  • Wrench and sockets

Show MoreHide


    Prevent Leaks Through Routine Maintenance

  1. 1

    Prevent transmission fluid leaks through routine maintenance of your automobile engine. Follow the instructions in your automobile manual. Manufacturer's of most engines recommend transmission fluid changes every 30,000 miles.

  2. 2

    Drive your automobile for approximately a mile or around the block to warm up the transmission fluid.

  3. 3

    Elevate your vehicle with a jack or put it on a ramp. Make certain the vehicle is secure before working under it.

  4. 4

    Using your wrench or ratchet, remove the outer plug -- if applicable -- and then remove the transmission fluid drain plug. Drain the fluid into a plastic or metal container.

  5. 5

    Clean the drain plug with a clean cloth. The transmission drain plug is magnetic so that it captures small bits of metal as the transmission gears wear. Wipe the plug thoroughly and replace after all fluid has drained out. Tighten the plug.

  6. 6

    Pump new fluid into the transmission through the fill plug. This plug is usually located on the side of the transmission. Use the amount of fluid recommended by your automobile owner's manual.

    Stop Leaks

  1. 1

    Notice the signs of transmission oil leaks: oil on the driveway, sluggish transmission, low fluid levels as determined by checking with a dip stick.

  2. 2

    Perform routine maintenance when a transmission fluid leak is evident. Drain the fluid from the transmission, according to the previous steps.

  3. 3

    Loosen oil pan bolts with a wrench and remove the pan. Clean the pan with soap and water and wipe dry.

  4. 4

    Spread gasket sealant around the gasket ridge of the oil pan. Make certain sealant is around each bolt hole.

  5. 5

    Press the gasket into place in the sealant on the drain pan. Put bolts through the holes to keep the bolt holes open. Let cure for 30 minutes. Replace the pan. Make certain bolts are tight.

Tips and warnings

  • Stop-leak products may be added to manual transmission fluids to correct minor problems with the gasket seal. Seals do dry out and can be rejuvenated by the addition of a stop-leak product that causes seals to expand and regain plasticity.
  • Transmission fluid and drain plug is hot. Be careful.

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