Hi all, happy Supra owner new to inboards. My boat is a 97 Comp with a 351 H.O. PCM according to the tag on the motor. History is unknown, I traded it for a bike. It looks almost new, sounds amazing and crazy fast. Since I've had it I only changed the oil and repaired minor things here and there to make it run like a top, has run extremely well until yesterday. Moving down the lake at a good pace I noticed temp climbing fast. Dropped to idle and things started smoking. I turned the motor off and scanned for options. I just happened to be near a closed ramp where I was taking my littles to swim. Jumped out and swam boat to the dock. Called a friend who took me to my truck and I was able to convince the guards to let me in to collect my boat. It was not cooling fast but while waiting for her I decided to see if it would start. It had a sluggish crank, then just a click.
Back in my garage today and tried to start it. Just click. Bypassed the solenoid, just click. Pulled the spark plugs and found water in two cylinders. I was able to turn motor over by hand and tried to use the starter to push water out. No go. Pulled starter and bench tested- it's toast. Back to original problem, for some reason I pulled the hose off of the top of the impeller housing expecting to find fragments of rubber. Looked good from the top, I turned the motor over but did not see the impeller move at all. Belt was turning pulley, but not impeller. Removed it and opened it- to my surprise it looks new (PO said he had it and the water pump replaced last season. I can see a new gasket on thermostat so I assume so). I'm puzzled and looking for advice on where to start. Obviously will drop oil and am confident if the rings are not melted or bearings trashed I can get it running again but I'm new to impellers and don't know what to think about it not spinning but after I took it apart and put it together I can see it spin. I looked at the oil cooler and it did not have anything blocking it so I'm confused as to why it overheated and where I should start assessing for damage. Any pro's mind sharing some advice? Thanks.
Back in my garage today and tried to start it. Just click. Bypassed the solenoid, just click. Pulled the spark plugs and found water in two cylinders. I was able to turn motor over by hand and tried to use the starter to push water out. No go. Pulled starter and bench tested- it's toast. Back to original problem, for some reason I pulled the hose off of the top of the impeller housing expecting to find fragments of rubber. Looked good from the top, I turned the motor over but did not see the impeller move at all. Belt was turning pulley, but not impeller. Removed it and opened it- to my surprise it looks new (PO said he had it and the water pump replaced last season. I can see a new gasket on thermostat so I assume so). I'm puzzled and looking for advice on where to start. Obviously will drop oil and am confident if the rings are not melted or bearings trashed I can get it running again but I'm new to impellers and don't know what to think about it not spinning but after I took it apart and put it together I can see it spin. I looked at the oil cooler and it did not have anything blocking it so I'm confused as to why it overheated and where I should start assessing for damage. Any pro's mind sharing some advice? Thanks.
