monterey262
Contributing Member
"Background- 2000 5.7 GSi 1.95
"Background- 2000 5.7 GSi 1.95 DPS running F5 props, 856 hours. Boat in LI Sound, WT has been between 72 & 76. Replaced manifolds, risers, engine water pump, sea water pump, thermostat housing and temperature gauge sender in 2007 at 639 hours as preventive maintenance when replaced both heads. Replaced outdrive intake hose (#3852352) and nipple last season. New impeller and thermostat this season at 807 hours. Beginning of June engine wasn't building temp above 120-125 degrees so replaced thermostat with new 160 degree, everything was normal (150-155) until middle of July when alarm went off after running at 3500 for about 15 minutes. WT never exceeded 160 on the gauge. Backed off and let cool but alarm has been coming on since, always around 160 on the gauge. I know it is WT related as the risers are equally very hot to touch, not warm like they normally ran. Checked everything obvious; impeller is like new, engine water pump is like new including the impeller, all hoses are clear, cleaned minimal growth from intake grills and back flushed through sea water intake hose. Removed thermostat housing, no blockage, checked thermostat and it opens at 150. I have performed the SELOC raw water flow test before I pulled the boat and it checked out okay. I pulled the drive today and the intake hose and sealing o-ring between the drive and shield are okay. I am stumped and before I remove the risers I would like your opinion on the possibility of PS oil cooler blockage. Is this common? With the ear muffs on, minimal water pressure running at 800 and the raw water intake disconnected at the thermostat housing, the outlet flow is more of a surge then a steady flow. Not sure if that is normal. The gauge is all over the place. It will rise to 200 then drop off to 140-150 and then bounce to 175 and drop off. It doesn't matter what rpm range. At a steady 1000 it will run for about 10 minutes at 175 and then climb. It wasn't doing this in the water. El do you have any ideas? Thanks, Ray"
"Background- 2000 5.7 GSi 1.95 DPS running F5 props, 856 hours. Boat in LI Sound, WT has been between 72 & 76. Replaced manifolds, risers, engine water pump, sea water pump, thermostat housing and temperature gauge sender in 2007 at 639 hours as preventive maintenance when replaced both heads. Replaced outdrive intake hose (#3852352) and nipple last season. New impeller and thermostat this season at 807 hours. Beginning of June engine wasn't building temp above 120-125 degrees so replaced thermostat with new 160 degree, everything was normal (150-155) until middle of July when alarm went off after running at 3500 for about 15 minutes. WT never exceeded 160 on the gauge. Backed off and let cool but alarm has been coming on since, always around 160 on the gauge. I know it is WT related as the risers are equally very hot to touch, not warm like they normally ran. Checked everything obvious; impeller is like new, engine water pump is like new including the impeller, all hoses are clear, cleaned minimal growth from intake grills and back flushed through sea water intake hose. Removed thermostat housing, no blockage, checked thermostat and it opens at 150. I have performed the SELOC raw water flow test before I pulled the boat and it checked out okay. I pulled the drive today and the intake hose and sealing o-ring between the drive and shield are okay. I am stumped and before I remove the risers I would like your opinion on the possibility of PS oil cooler blockage. Is this common? With the ear muffs on, minimal water pressure running at 800 and the raw water intake disconnected at the thermostat housing, the outlet flow is more of a surge then a steady flow. Not sure if that is normal. The gauge is all over the place. It will rise to 200 then drop off to 140-150 and then bounce to 175 and drop off. It doesn't matter what rpm range. At a steady 1000 it will run for about 10 minutes at 175 and then climb. It wasn't doing this in the water. El do you have any ideas? Thanks, Ray"