Marine: Boating, Sailing, PWC, GPS and Navigation - poppit valve

can anyone explain to me where and how to acess the poppit valve on a 25 hp mercury tiller model outboard. its a 87 or 1988, and manual shows nothing of ot, or thermostat. thanks

It is under a cover on the left or port side. The cover has 2 round portrusions (sp?)held on by 4 bolts. I think this is correct if you list your ser# I can look it up for sure. Sorry I didn't get back to you sooner but it's been a crazy week.

ill get serial posted. thanks pal

its OD295058 for my 25 hp merc outboard

http://i400.photobucket.com/albums/pp89/chetolson/13.gif

I don't have my merc software at home but this is in your ser# range. It shows a thermostat referance # 37 but no popit valve.

So I would run the motor on a hose with the thermostat cover off to see if you have good water flow. If you do put your thermostat in a cup of hot water with a thermometer. the opening temp should be stamped on the stat.

If that all seams good I would check the gasket under the water pump and arround the housing. It's rare but I have seen a bad gasket will pump fine when under water but once the boat is on plane that part of the gearcase is out of the water and will suck air.

If I have time at work I will look up your ser# to be sure.

realy do appreciate all yer help.

No problem I actually learn just as much as I help so keep me posted and we will get this.

I didn't get a chance to look up your specific ser# but does it look like the diagram?

wich number in the diagram is the poppit valve though.

I'm sory It doesn't have one but it does have a thermostat #37.

ok thanks ill open that up and have a look at her. ill keep u informed of my progress