1991 V4 90HP Overheat

[pfiedler]

I just had my water pump and tstats replaced last August (2001). Everything ran great. The boat has been on a trailer in my garage since the end of last summer. Took it out tonight, hooked up a garden hose with water ear muffs and about two minutes after starting the engine, my overheat alarms went off. I have a solid water discharge stream but the water was almost at the boiling point! I shut the motor down right away and it took about 20 minutes before the overheat alarm stopped.<br />Having just replaced the water pump last year I can't understand why this is happening. I read something about air getting trapped (this was on a 120 HP motor) preventing the tstats from opening the water flow. Is there any way to check this? Is there a good repair guide available for this engine which might highlight such a problem?<br />Thanks for any assistance provided

 

[DJ]

Re: 1991 V4 90HP Overheat

pfiedler,<br /><br />If this engine is a crossflow, it is not unusual for them to "heat up" when run on the muffs.

 

[pfiedler]

Re: 1991 V4 90HP Overheat

Hi...thanks for responding so quickly!<br /><br />The model is an E90TLEI...I'm not sure if it's a cross-flow or not. Perhaps you are familiar with the model.<br /><br />Anyway, thanks for the reply and the advice.

 

[P.V.]

Re: 1991 V4 90HP Overheat

Here's what to do on a cross-flow motor that "overheats" either with a flusher or in the water. If it's pumping a good amount of water, but still sounding the horn, you must shut down ,wait for the sensor to cool, and then re-start. Take the warm-up lever and CRANK THAT MOTOR UP !!!! Now, we normally don't instruct customers to do this but you are trying to use the added water pressure to unseat the pressure control valves located next to the thermostats. They're just stuck. Only do this about one or two times but a healthy "high rpm rev" is in order. Just for a second only. Did I say a second only??????? If the engine still overheats, you are gunna have to remove the thermostats and valves again. Royal pain in the arse !!!!! Trust me, I'm not bul;l-s%@**ing you . Regretably, I've taken quite a few of these apart, done water-pumps jobs and found out that this is the mosr expedisious(sic) way to solve it, short of dissassembly.