Background Info:
All help would be appreciated.
- 2001 Cobalt 206
- Engine #: 4012046270
- Volvo Penta DP, 5.0GIPEFS
- 118.5 hours on engine
- Installed impeller kit part #: 21951348 (included glycerin lubrication pack and new ?O? ring)
- Replaced thermostat part #: 3856961
- Started boat with out-drive hose attachment.
- Water did not appear to be fully flowing into the engine.(I?ve noticed in the past that sometime the ears on the out-drive appears to be sucked tight to the drive when the engine is running. This did not happen)
- Brought boat to local lake and launched to test again under different conditions.
- Started engine and revved slightly to prime impeller.
- After a few minutes boat overheated and engine automatically shut down when the engine temperature approached 200 degrees.
- Allowed engine to cool and tried again. Same results.
- Re-loaded boat on the trailer and headed home.
- Risers checked for blockage (none found ? see picture)
- Used garden hose to spray water from impeller inlet hose through to the out-drive inlet port without any flow restriction or blockage.
- Used garden hose to spray water from impeller outlet hose into the engine and out the stern drive exhaust without any restriction or blockage (Engine cold and thermostat most likely in the closed position)
- Re-inspected impeller (see picture)
- With the impeller installed in the housing (same as in the picture) , I used my the palm of my hand to seal off the impeller reservoir opening and blew air into the inlet hose opening. Air flowed with little restriction in both directions. Is this correct? I would think that an impeller pump when not spinning would not allow water or air to pass (otherwise all the water in the engine could drain out of the boat when it was taken out of the lake).
- Does the impeller need priming? I would think with the hose attachment and pressure at the drive that water would be available to the impeller.
- Does the boat have an additional water pump in the engine?
- Does the Volvo Duo-Prop out-drive have an impeller?
All help would be appreciated.