Merc 250xs
2005
Ser# 1E000996
Merc Monitor Series 1
New water pump and service about 3 months ago. I was getting 15-20 psi. Recently changed my jackplate. Same setback. First trip out I was too high. I knew it, but didn’t have tools to lower. Ran 1/2 speed 3-4 times about a mile each run to some close fishing spots. Water pressure was only about 8-10 but at only 50/60% from WOT. Reset motor at correct height and the same as it has been for long time. Today (next trip) I could only get 12.5-13 psi at WOT instead of the 15-20 in the past. Engine temp would get 130-135 and stay in that range. No idea what my water temp used to be. Only know today because I was watching because of water psi. Pee stream looks normal. Idle psi is 3.5 which I think is normal. No alarms or anything and ran great.
Is the 12.5-13 psi a concern?
Is temps in 130’s normal?
What could/would cause by water pressure to drop by 5 basically from 1 trip to the next?
My concern was an air gap from that 1 trip running too high or could that 1 trip have damaged the rubber on impeller without ever over heating the engine? Or something else like poppit?