Wet Test

[reelapeelin]

I've been dyin' to push the throttle on this thing since bringin' her back from Dave's w/the 200 Johnnie...hauled to lake, got her cranked up and running...took a few minutes...helps to turn the fuel line valve on...

The Good, the Bad and the Where's the Paddle...after everything shook out, she ran across the water like a scalded dog!!...good, steady power and could feel more comin' on...but then the horn in the control box went off and had to shut her down...over heating...on/off the phone w/Spare and he's narrowed it down to t'stats as next move...I agree...will run @ idle all day...once up and running hard, water stops and warning horn blows...1/4 mile from dock...oh here's the paddle...after she cooled down a while, put the paddle away and back to the dock...twice...
I'll run her on hose tomorrow and test out stats and hopefully that' all it is...will get some pics next outing, but enthused about how this boat feels w/this motor!!..stay tuned!!...

[THEFERMANATOR]

If this is a early looper, the T-stats are out of the picture above 3000 RPM's. They are only supposed to be active at slow speeds, and the water diverter valve(black plastic valve atatched to the throttle linkage with 3 hoses) allows the t-stats to be bypassed. If it is a 93+ looper then most likely it is the t-stat springs or a weak pump. If it's a cross-flow also check the impeller or bypass's.

[reelapeelin]

Originally Posted by THEFERMANATOR

If this is a early looper, the T-stats are out of the picture above 3000 RPM's. They are only supposed to be active at slow speeds, and the water diverter valve(black plastic valve atatched to the throttle linkage with 3 hoses) allows the t-stats to be bypassed. If it is a 93+ looper then most likely it is the t-stat springs or a weak pump. If it's a cross-flow also check the impeller or bypass's.

Wow...thanks Ferm!!...'89 looper and never got it past 3 grand, so you may be on to something...plus the diverter valve you mentioned has a small, steady leak and I don't know if that's a possible culprit here or not...the pisser stops pissin', but if you disconnect the back tube from the diverter that goes to the starboard t'stat(plenty of water coming outta there) and then reconnect it, then it starts pissin' again...
IF the t'stats are faulty, could they be closing at the wrong time and shutting the flow off?...Spare put a new water pump on just after we hung it on the boat, so confident no issues there...
Thanks for your thoughts...

[THEFERMANATOR]

If it stops pisson you need to find out why. The pisser is fed off the exhaust cavity which is early on in the water flow. If you didn't get it over 3 grand then it could be t-stats though as they should still be in the equation then. The t-stats are mounted into plastic housiongs that are atatched to rubber diaphrams. When the throttle valve is in the slow speed position it puts water pressure to the t-stat covers which pushes the t-stats into there seats and allows them to regulate the temp. When teh throttel reaches a certain point it then reroutes that water from teh valve to the pisser and this takes the pressure away from the t-stat diaphrams which allows the housings to move away from the seats and then the water freely flows so that nothing regulates the temp except the water flowing through the heads. A common cause of the pisser stopping after the engine is up to temp and when you give it throttle is leaking head gaskets. It would be a good idea to retorque the heads just to be safe.

[reelapeelin]

Originally Posted by THEFERMANATOR

If it stops pisson you need to find out why. The pisser is fed off the exhaust cavity which is early on in the water flow. If you didn't get it over 3 grand then it could be t-stats though as they should still be in the equation then. The t-stats are mounted into plastic housiongs that are atatched to rubber diaphrams. When the throttle valve is in the slow speed position it puts water pressure to the t-stat covers which pushes the t-stats into there seats and allows them to regulate the temp. When teh throttel reaches a certain point it then reroutes that water from teh valve to the pisser and this takes the pressure away from the t-stat diaphrams which allows the housings to move away from the seats and then the water freely flows so that nothing regulates the temp except the water flowing through the heads. A common cause of the pisser stopping after the engine is up to temp and when you give it throttle is leaking head gaskets. It would be a good idea to retorque the heads just to be safe.

Two thoughts...if the system is pressurized, would the leaking diverter cause a disruption in the flow?...would I see water leaking past the head gaskets if that?...and do you know the torque setting?...

And when I said not over 3 grand...pretty sure not, but additionally not sure tach is reading properly...it's a new teleflex...do you know for sure which setting it should be on

[THEFERMANATOR]

Originally Posted by reelapeelin

Two thoughts...if the system is pressurized, would the leaking diverter cause a disruption in the flow?...would I see water leaking past the head gaskets if that?...and do you know the torque setting?...

And when I said not over 3 grand...pretty sure not, but additionally not sure tach is reading properly...it's a new teleflex...do you know for sure which setting it should be on

It should be set for 12 pole which should be 5 or 6 on your tach. Those valves always leak a little it seems like. If the diverter valve is in wrong it can cause overheating problems as it will work in reverse. the heads should be torqued to 18-20 foot pounds starting in the center and working outward in a circuliar pattern. They are known to leak compression into the cooling system but not water into the cylinders.