overheating issue? Poppet valve?

**Valero2.5** · 06-16-2015, 04:23 PM

The guy removed serial numbers and its a 2.4 200 hp block, lets say 1986? it runs through long slow no wakes perfect, once on plain, it rises to over 215 degrees, i shut down and idle and goes back ok. Fresh engine, and water pump last year, strong 6 foot stream, poppet valve? i have been told? how expensive and are parts readily available to do myself? what is time to install? thanks, JIM

**TooStroked** · 06-16-2015, 04:35 PM

Where are your water intakes in relation to the transom? The reason I ask is that if your motor is mounted (or raised on a Jack Plate) too far, you can easily have great water pressure & cooling at idle and lose it once on plane. What's the "strong 6 foot stream" look like once on plane?

**Valero2.5** · 06-16-2015, 09:10 PM

well i do have a jack but was running motor all the way down on jack testing boat for some tubing we are planning with guests. i have water temp, pressure and tach, i use a lot. I think we have a poppet issue, since motor is really low on transom when down and although no cone on this one, i am only driving around at 30 mph hardly on plane, so motor is deep.

**transomstand** · 06-17-2015, 06:46 AM

What is the pressure and rpm at 30 mph?

**Dave Strong** · 06-17-2015, 08:59 AM

If your running a high pitched prop and skiing, tubing etc. That can make it run hot, if thats the case try a prop with less pitch.

Dave

**Valero2.5** · 06-23-2015, 08:35 AM

we pulled the spring out of Poppet valve and all is fantastic now, running nice low temps! Thanks guys!

**allstock** · 06-23-2015, 10:05 AM

Originally Posted by Valero2.5

we pulled the spring out of Poppet valve and all is fantastic now, running nice low temps! Thanks guys!

Well that's kinda weird because it shouldn't. The poppet valve is there to release excess water psi, if you pull the spring it shouldn't have much psi if any at idle, might be okay once your moving.

**Dave Strong** · 06-23-2015, 01:35 PM

Poppet should open just over 10 psi. With no spring would at less press. Have something strange going on.

Dave

**Valero2.5** · 06-23-2015, 01:53 PM

good stream at idle and nice low temp now so we are happy til parts come in for new poppett, on to the other motor with trim issue, this case closed. Thanks, JIM