50 hp water pump replacement

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,348
I have a 2020 MFS 50. How do you release the shift linkage to drop the lower unit?
Around the upper gear case there should be a round shift rod joint that holds the upper shift rod to the lower leg's cam rod by means of a spring pin, if so must push the spring pin out to release both vertical rods...

Happy Boating
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
14,922
That model should have the threaded coupler since its a 4S. Loosen jam nut with 10mm wrench while holding coupler.
 

Pinter Boat

Cadet
Joined
Jun 5, 2016
Messages
19
Yes. It has a threaded coupler. What is a 4S?
Thank you. Does the threaded coupler adjust how it shifts, i.e. do I have to tighten it back to the exact same position in order to get it to shift properly?
 

pvanv

Admiral
Joined
Apr 20, 2008
Messages
6,339
Put the coupler back where it was... as closely as you can.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,348
Thank you. Does the threaded coupler adjust how it shifts, i.e. do I have to tighten it back to the exact same position in order to get it to shift properly?
I'd guess the threaded coupler is screwed till stops tight as you found it before being uscrewed. 4S (Four Stroke)...

Happy Boating
 
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