89 Grand Marquis Head Gaskets and Mains - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

micro_me289 · 07-22-2009, 18:19

So the Grand Marquis needs a new head gasket and the front and rear mains. How hard are they to replace?

**jwko** · 07-22-2009, 18:58

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.

micro_me289 · 07-22-2009, 19:29

do you know if the lucas stop leak oil treatment might fix the problem?

**jwko** · 07-23-2009, 04:49

I'm really not for sure. Maybe if it were an occasional drip it might help, but if it's a big leak probably not

fixitnowlt · 07-23-2009, 20:09

Man, for the price of all that work just go for a rebuilt long block. Way more time and cost effective that way.

**87_Crown_Vic** · 07-25-2009, 08:36

with all that work... better off finding a HO engine and dropping it in. after HO is in, would have to change the computer in the car and put the accessory pullies on front of engine the way it is on the stock setup engine. go to Car-Part.com--Used Auto Parts Market and try to find a Mark 7 engine or one from a 1997 Explorer / Mountaineer. then you will have added power opposed to paying all that money on repairs to keep it stock. to me, stock and oriinal is BORING.