Hi there,
I'm trying to figure out what's going on with this tem gauge issue. I've got a 1993 OMC 5.7 EFI Cobra with the SX outdrive. Here's what's going on. She'll heat up to about 200 degrees and then at times bounce up to 205-210 then come back down to 200 when we're underway. But at home with the hose hooked up to her she'll stay right at 160. Now with that said.........I've researched all the forums for answers. Here's what I've done. On the outdrive I replaced the impeller, installed a new gasket and the housing and made sure there were no air leaks around the impeller housing. Still does it. So I replaced the thermostat with a brand new 160 degree one from iboats, still does it. So one day we ran the boat up river for about 8 miles and I checked the risers on the engine and I could hold my hands on them without flinching. They weren't hot. So then I went and checked all the hoses and tightened some clamps and back flushed the motor, still no effect on the temp reading. The only thing I haven't checked or fooled with is the screen over the intake in the lower unit on the outdrive or the gauge itself. I've kinda gotten used to keeping one eye on the river and one on the temp gauge. I installed captains call exhaust this past summer and noticed that now it doesn't do it as frequently but yet it still does it. Any suggestions/ideas ????
Thanks for any help
Ps, raw water cooling system and the boat was originally from Florida and in saltwater for how long I don't really know.
I'm trying to figure out what's going on with this tem gauge issue. I've got a 1993 OMC 5.7 EFI Cobra with the SX outdrive. Here's what's going on. She'll heat up to about 200 degrees and then at times bounce up to 205-210 then come back down to 200 when we're underway. But at home with the hose hooked up to her she'll stay right at 160. Now with that said.........I've researched all the forums for answers. Here's what I've done. On the outdrive I replaced the impeller, installed a new gasket and the housing and made sure there were no air leaks around the impeller housing. Still does it. So I replaced the thermostat with a brand new 160 degree one from iboats, still does it. So one day we ran the boat up river for about 8 miles and I checked the risers on the engine and I could hold my hands on them without flinching. They weren't hot. So then I went and checked all the hoses and tightened some clamps and back flushed the motor, still no effect on the temp reading. The only thing I haven't checked or fooled with is the screen over the intake in the lower unit on the outdrive or the gauge itself. I've kinda gotten used to keeping one eye on the river and one on the temp gauge. I installed captains call exhaust this past summer and noticed that now it doesn't do it as frequently but yet it still does it. Any suggestions/ideas ????
Thanks for any help
Ps, raw water cooling system and the boat was originally from Florida and in saltwater for how long I don't really know.