Lol was there even 80 of them?

I know but I wanted to say 40 to 60 but thought someone would jump me for that. My best guess seems like 50 to 75 range.

page 33 Max allowable oil temp 284 F

also I have the current Merc Racing info for the 1350 they list the same allowable oil temp at 6500 rpms --- 284 F

page 33 here in the link for the 1075

https://www.scribd.com/doc/101451908...-Owners-Manual

No check balls in the TS housing. Seawater pump is the Hardin pump and new this year.

Also need to get my pressure down below 80 psi

Good info BUP. Thanks.

I want to add the term "Max Allowable" does not mean that you want to be there routinely.

being that he is seeing 240* cruising along at 3600rpm, with a 530hp engine, sounds to me like he is in need of some cooling help. As well as running a 140 water stat, and yet his water temps are 170..

Just my two cents, I would check your oil level relative to crankshaft, if over filled you will whip the oil with the crankshaft causing high oil temps, also I would also check the oil bypass valve make sure you have the right one because that will bypass oil filter and oil cooler if it's the wrong tension. I believe the marine version is 18 lbs.
Good luck

I believe everyone uses the 30# spring in marine engines. I just plug it though.

^^^^^^^ Yes it is 30 for the valve not 18 --- and Merc does state this in a few of its service manuals. ^^^^^^^^

Maybe look at water flow volume to see if its providing enough cooling water.

You have over 80 psi for oil pressure ? Too high is not good either. cavitation in the oil pump can become an issue with too high oil pressures.

Also to high pressures in some cases can also be related to a form of restriction

Oh I thought this was WOT temps and IMO sounds like not enough cooling water volume or inadequate part(s) related for the cooling system to me as both are higher ( water temps and oil temps)