SCORPIO
Well-Known Member
For those with raw water cooled small block GM engines (350s 5.7s) how hot does your temp gage read at idle and under cruise conditions? Especially those of you with 86-89 300 DA's.
Both my engines had been running 145-150 degrees at idle and under load until just recently. Now, my port engine wants to run at 165 at idle and 150 under cruise at about 3000rpm. The starboard engine is still rock steady at 145-150. I replaced my thermostat(140 degree) and thermostat housing. I pulled and cleaned my inside riser, it was already clean, no scale. Both drives had new water pumps installed before the start of the season, and I haven't used the boat that hard this year. I scrubed the water inlets on the lower units and backflushed the power steering cooler.
I even swapped the gages from port to stbd to see if it was an instrument problem, no luck, the port engine is definatly running warmer than the stbd. The mechanic that rebuilt the drives said that unless the temp climbs to around 200+ and stays there, not to worry about it. I'm concerned that I have something restricted that may get worse.
Does anybody have any ideas? I'd also like to hear what your operating temps are.
BTW I'm in salt water and the temps are in the mid to upper 70s right now.
Thanks
Both my engines had been running 145-150 degrees at idle and under load until just recently. Now, my port engine wants to run at 165 at idle and 150 under cruise at about 3000rpm. The starboard engine is still rock steady at 145-150. I replaced my thermostat(140 degree) and thermostat housing. I pulled and cleaned my inside riser, it was already clean, no scale. Both drives had new water pumps installed before the start of the season, and I haven't used the boat that hard this year. I scrubed the water inlets on the lower units and backflushed the power steering cooler.
I even swapped the gages from port to stbd to see if it was an instrument problem, no luck, the port engine is definatly running warmer than the stbd. The mechanic that rebuilt the drives said that unless the temp climbs to around 200+ and stays there, not to worry about it. I'm concerned that I have something restricted that may get worse.
Does anybody have any ideas? I'd also like to hear what your operating temps are.
BTW I'm in salt water and the temps are in the mid to upper 70s right now.
Thanks