Re: 89 Grand Marquis Head Gaskets and Mains
For a novice, definitely a hard job. The rear main seal will require the transmission to come down or be slid back enough to access it. The front seal will require access to the timing cover which would mean removing the harmonic balancer. The head will require removal of the valve cover, the intake, the valve train and components bolted to the head. Might want to consider having a mechanic do this work.