Thermostat GLM13230 OEM # 87290A4

[thomascrown]

I replaced my engine with an ATK rebuilt and a new SEI106 Lower unit.
I have new risers, manifolds, circ pump,and new thermostat with T valve and check balls.

Started the boat and temperature went to 200, verified this on hose and in the lake. I pulled the thermostat 140 degree, and ran the engine, and it ran 150. Raw water cooling system.

I was using the closed gasket, and also tried the open gasket. Same results. I pulled one of the hoses to the exhaust manifold and it had steam no water.

I used AI to walk me thru and it is telling me the brass insert is what is causing my issue. It says the brass insert needs to be lip up. I had it lip down, holding the thermostat. Every picture I have seen shows it like this.

Can someone answer this question definitely on the correct orientation of the brass insert. Mercruiser 305 V-8.

Gasket - thermostat- brass sleeve lip down, free flow gasket, cap.

Appreciate it.
Thanks

 

[Pmt133]

The lip goes down. You want the closed gasket if using the 140 thermostat and check ball assembly. Water will flow to the elbows out the checkball tee but not the manifold as that water is the outflow of warm water from the block. The manifolds will only have water flow once the thermostat opens.

 

[thomascrown]

The lip goes down. You want the closed gasket if using the 140 thermostat and check ball assembly. Water will flow to the elbows out the checkball tee but not the manifold as that water is the outflow of warm water from the block. The manifolds will only have water flow once the thermostat opens.

So why am I not getting flow to the exhaust manifolds when the thermostat opens. I pulled the cap off after running it, and the thermostat was wide open. But I had steam come out the exhaust manifold hole before I took the cap off.

 

[Pmt133]

Are you getting sufficient water flow in and confirmed there are no restrictions on the block out the thermostat?

 

[thomascrown]

Are you getting sufficient water flow in and confirmed there are no restrictions on the block out the thermostat?

I am. Which is why I ran it both in lake and on hose. Everything is getting water when I remove the thermostat, when it is in, the exhaust manifolds are not getting water. I can hear them begin to boil water, thus when I pull the hose that supplies them water, the steam.

 

[Scott06]

I am. Which is why I ran it both in lake and on hose. Everything is getting water when I remove the thermostat, when it is in, the exhaust manifolds are not getting water. I can hear them begin to boil water, thus when I pull the hose that supplies them water, the steam.

verify the thermostat is opening, would not be the first time a new one didn't work. Put it in a pot of water see what temp it opens at and if it opens fully.

 

[Bt Doctur]

pull the drive ,stick a hose in the water inlet hole and retest

 

[Lou C]

an old school radiator thermometer is great for checking a 'stat in a pot of water....I rigged up a length of coat hanger wire to hold the stat and the thermometer off the bottom of the pot....