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Bottom half of the gearcase.----Also called the skeg.-----Or lay motor on it's side and see if you can position shifter so you can see the hole.------Did this job many times 50 years ago when I worked at a Johnson dealer !!

Take lower unit off.----- Take the cap off.-----Assemble with clutch dog in forward and shift rod in forward ( up into the unit ) and install cap.----Install pin.

????----That carrier is NOT THREADED !!!

Many sellers on AMAZON make money on the quick service delivery fee.

Looks like a V-4 90 degree looper.-----120 / 130 / 140 HP.------Post picture of cowling if original paint / graphics.

Rubber lips on oil seals do wear out.----A 25 year old gearcase benefits from a complete seal kit.

Well-----running time of 5 to 6 hrs every day will be tough on those boats.-----Locally we had a " poker run " out on the lake.------One or more owners had to go get their trailers as boats could not take another 1 hr pounding in 5' waves

Open the low speed / idle mixture screws 1/8th turn at a time till bogging goes away.

Very easy to remove bypass covers to inspect condition of motor.

Find another dealer !

What motor ?-----Does spark jump a gap of at least 5/16" ( 8 mm ) on a test device ?

Time for a seal kit.-------Much cheaper than gears , bearings and shafts.

Drill out the plug.----Remove screen.------Tap for a pipe plug.----Install new / repaired screen.-----Install plug.

They built a lot of those 48 SPL motors.-----I can not believe you could not find new / used parts to keep it running.----What parts were deemed to be " hard to find " on it ??

Is the gauge in fact aluminum or the cast iron sleeve.-----If aluminum then a product called ----LUMIWELD-----Might be used for the repair.

You might find that the Evinrude / Johnson drain plug is the same.--Will fit if Mercruiser uses 3/8-NC thread.---I have seen those hex allen ones stripped as well.

There are better more reliable motors out there.----Takes time to find a good one.------Yes it is acceptable to bore one cylinder.

Very valid point.------The older 2 strokes are easy to trouble shoot.----Repair / rebuild.-----The 4 strokes are great when they run.----Start when you look at the key !!--Expensive to repair if you can find a shop with the right mechanics.

Going to be expensive.-----Best look for another motor.----Your location ?

Need to use more force to raise the drive.----Sounds like it is jammed by those 2 pins at the bottom.