The head, or top part of the motor, must be removed to replace valve seals. After the head is removed take it to a machine shop and they will mill the head to make sure it is flat and also grind down the valves and replace the valve seals.
Replace the valve seal and check the valve guide for wear.
valve seal possition
IF YOU MEAN THE OIL IS DOWN IN THE SPARK PLUG TUBE. THERE IS A SEAL THAT IS IN THE VALVE COVER THAT GOES AROUND THE TOP OF THE SPARK PLUG TUBE, THEY GET HARD AND START TO LEAK INTO THE TUBES AFTER A WHILE. YOU WILL HAVE TO REMOVE THE VALVE COVER TO REPLACE THEM.
Replace valve seal
Its called a valve cover gasket kit and the job should cost about 300.00 Parts and labor.
You must remove the transmission are engine to replace the rear main seal.
I just got mine replace this morning...my 626 is just one year older than yours....but it cost me 200.00 $
Oil Pump Check Valve. Replace oil pump
Yes, you remove the rockers, add air pressure in the cylinder through the plug hole and use a valve spring compressor to remove valve spring. You can now change the valve seal.
What do you want to know? Take the heads off, remove the valves, and springs to get to the valve stem seals
The quote from my dealership was $1400.00
the seal on the valve cover needs to be replaced. my 2000 neon had the same problem. I replaced the seals in the valve cover and it fixed the problem. The kit came with the seals for the spark plugs.