2003 350 mag, oil pressure and eng temp

[livnrdream]

Purchased a 2003 260da with 350 mag BIII past spring, it had 290 hours on it. Running in fresh water Lake Erie. I have been watching gauges fairly closely. My engine temp after warm up stays steady at around 190 deg F and the oil pressure is around 40 psig under load 3600-4000 rpm and drops to around 15 psig on idle after a run. Are these typical type numbers for this engine. The engine does not use any oil, clean on the stick. I have put about 15 hours on the motor since purchase. My previous boat had a 350 - 260 hp Merc Alpha 1 and ran at much lower 160 deg F water temp and higher 60 psig oil pressures, it had 450 hours on it.

 

[stevea661]

Your oil pressure seems ok. Your temp seems high. Raw water cooling 160 ish is ok. Closed cooling, mine runs between 170 and 180. I don't know what kind of cooling you have. All that stuff needs maintnance.

 

[bartlett]

Gauge or sending unit could be the problem. Get you shop to check the actual engine block temperature.

 

[Bridog]

Mercury rating. Closed cooling 170, seawater cooled 160.