MonteCarlo 2000

Rear Main Seal


Removal & Installation

3.1L, 3.4L & 3.8L Engines

Please note that the entire transaxle assembly must be removed to perform this procedure. Make very sure of the diagnosis before beginning work.

  1. Remove the transaxle from the vehicle.
  3. Remove the engine flywheel using the procedures found in this section.
  5. Remove the rear oil seal by prying out of the engine block. Use care not to nick the crankshaft when removing the seal. Pry the seal a little at a time, repeating as necessary around the crankshaft rear oil seal.

Click image to see an enlarged view

Fig. Rear crankshaft seal service-3.1L, 3.4L and 3.8L engines

To install:

  1. Clean all parts well. Coat the new seal entirely with clean engine oil.
  3. GM recommends their seal installer J 34686 which presses the replacement seal into place. Many replacement seal kits come with a plastic driver suitable for one-time use. Use care if using substitutes. The goal is to get the seal installed squarely, bottomed in its bore, without damage. If there is any question about the condition of the seal after installation, remove and discard it and try again with another seal. Much time and effort are spend getting access to the rear crankshaft seal. Take the time to make sure it is correctly installed.
  5. When satisfied with the seal installation, install the flywheel using the procedures found in this section.
  7. Install the transaxle.