mercruiser t260's (350cid)

[buzzm19]

Hi guys, I have a simple question, I am changing over my log exhaust to center risers. The new thermostat housing has a tee fitting on top in the front, each outlet has a spring loaded ball, those outlets will have the water hose attached that goes to the bottom of the exhaust risers. My system is raw water with impeller and water pump, I was wondering what is the purpose of those balls, I am only guessing that they balance the water flow to each side. Thanks Buz

 

[alldodge]

Re: mercruiser t260's (350cid)

Don't understand the balls, do you mean the Y-pipe flapper valves?
Water Shutter | Mercruiser 4 Cylinder-Small Block V8

If this is what your talking about they keep water from coming back into the exhaust valves and breaking things.

 

[buzzm19]

Re: mercruiser t260's (350cid)

AllDodge, I thought this was a simple question. I know those flapper valves are in the "Y" pipe for the exhaust that is in the rear of the motor. I believe my question is well described, the thermostat housing is in the front of the motor and I did say t260's-350cid which are 8 cyl motors. Buz

 

[alldodge]

Re: mercruiser t260's (350cid)

Sorry but I have never seen spring loaded balls in a Thermo housing. Since they are spring loaded the only thing they could be are some sort of check valve. If you asked the question on "Offshore Only" they would probably of heard of them. Guessing they make sure the engine stays full of water since there would be no restriction of water going out stright pipes.

 

[Bondo]

Re: mercruiser t260's (350cid)

AllDodge, I thought this was a simple question. I know those flapper valves are in the "Y" pipe for the exhaust that is in the rear of the motor. I believe my question is well described, the thermostat housing is in the front of the motor and I did say t260's-350cid which are 8 cyl motors. Buz

Ayuh,.... They hold back the flow of water to balance the loads/ heat,...

Without 'em, you get Overheatin' at idle speeds,...

 

[alldodge]

Re: mercruiser t260's (350cid)

Thanks for clearing that up

 

[buzzm19]

Re: mercruiser t260's (350cid)

Bondo, thanks I thought along those lines because they only go to the elbows which does not affect the flow to the ex- manifolds. Buz

 

[djmakko]

Re: mercruiser t260's (350cid)

I have the same model housing, how tight these ball have to be ? mine are little loose , they close the inlets but a gently pull they are out let go and go back again , is this how they suppose to operate or they have to be tight that only pressure water can move them, in other words how can one tell if they bad or good?

 

[Bondo]

Re: mercruiser t260's (350cid)

I have the same model housing, how tight these ball have to be ? mine are little loose , they close the inlets but a gently pull they are out let go and go back again , is this how they suppose to operate or they have to be tight that only pressure water can move them, in other words how can one tell if they bad or good?

Ayuh,.... That's Right,...

 

[djmakko]

Re: mercruiser t260's (350cid)

Thanks Bond-o