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I have a '96 90hp Yamaha outboard w/ ~400hrs (90TLRT). Having a problem overheating. Am running in driveway w/ lower unit in a tub of water w/ inlets completely submerged. Sequence of events:
1) Weak flow during winter layup.
2) Spring start weak flow and alarm sounded. Shut-down immediately.
3) Checked lines and outlet, all clear.
4) Replaced impeller w/ OEM rebuild kit, although old "looked" fine. Blew air (mouth, not compressed) through outlet tube that attaches to grommet in impeller case, no apparent obstruction.
5) Re-assembled and started, no flow.
6) Checked thermostat in pan of hot water, opens at ~130F (although thermometer was not very good, but thermostat did open)
7) Re-assembled, started...no flow.
8) In an act of frustration, somewhere between 5 and 6 I disconnected outlet hose, blew air into hose bubbled out of inlet grate. Tried to suck water through hose, envisioned a mouthful of nasty, and stopped. I started up and smoke (H2o vapor or exhaust…not sure) came out of outlet.
1) Weak flow during winter layup.
2) Spring start weak flow and alarm sounded. Shut-down immediately.
3) Checked lines and outlet, all clear.
4) Replaced impeller w/ OEM rebuild kit, although old "looked" fine. Blew air (mouth, not compressed) through outlet tube that attaches to grommet in impeller case, no apparent obstruction.
5) Re-assembled and started, no flow.
6) Checked thermostat in pan of hot water, opens at ~130F (although thermometer was not very good, but thermostat did open)
7) Re-assembled, started...no flow.
8) In an act of frustration, somewhere between 5 and 6 I disconnected outlet hose, blew air into hose bubbled out of inlet grate. Tried to suck water through hose, envisioned a mouthful of nasty, and stopped. I started up and smoke (H2o vapor or exhaust…not sure) came out of outlet.
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