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T Valve wcheck ball

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bobkoss

Member
"I am new to the group. Just p

"I am new to the group. Just purchased a 1989 Slickcraft with a 5.7 Alpha 1 stearn drive. It was purchased as a project boat. Has been sitting with the engine out for 2+ years. (Dropped Valve). I will be installing a long block from S&S. I started cleaning the engine attachements and have a question about the Thermostat Housing. I completely disassembled the housing assembly for cleaning and sandblast.
When I reassemble the "T" Valve w/check ball, is there a spec. for the amount of spring resistance?? Or is snug against the seat good enough??? Thanks for any information.
Bob"
 
"Welcome Robert:

I just rep

"Welcome Robert:

I just replaced the entire T'stat assy. w/"T" ball check valves. There isn't any spec. in my factory manual for setting the balls. The one I removed had weak springs but the nut on the end of the screw was screwed on w/about 3/16" of thread past the nut. Your best bet would be to buy a new kit for a few dollars to replace the 18 year old springs or the entire assy. due to the amount of internal rust.

"T" valve and kit $38 http://bpi.ebasicpower.com/pc/GLM13236/MER8B/Tee+Valve+Assembly%2C+Mercruiser

Complete T'stat hsg. w/ "T" valve $102
http://bpi.ebasicpower.com/pc/GLM13230/MER8B/Thermostat+Housing%2C+Mercruiser+V6 %2C+Small+Block+V8%2C+With+Tee+Balls"
 
"Hi Guy G,
Thanks for the inf

"Hi Guy G,
Thanks for the info and recommendation. If the original T Stat housing cleans up I will only replace the balls & springs. If not, I will have to replace the entire assembly. It appears that my 1 piece housing is no longer available.
Thanks again,
Bob K"
 
Robert:

Good luck. Can you

Robert:

Good luck. Can you remove the brass plugs to check the interior condition for heavy rust? Heat the housing w/a propane torch and then take them out. Have the casting boiled at a radiator shop.
 
"Guy;
After our recent discus

"Guy;
After our recent discussion about these T fitting check valves, I had concluded that my 6.2 didn't have them. Much to my surprise in going thru my Merc manual I find that it does have these check balls after all. They are in the T fitting on top of the T'stat housing, in the hoses going to the exhaust risers.
So now I am wondering what purpose these serve?
The manual indicates that they are a check valve and should be lightly seated against the T fitting.
So the only purpose I can figure they serve is to restrict water from running back into the T'stat housing right after shutdown, so that the risers stay water flooded.
Does that sound right to you?
Rod"
 
"Rod:

I came to the same co

"Rod:

I came to the same conclusion along with another reason; if there is momentary or other blockage in exhaust flow at the "flapper" or past it, the exhaust can't force riser water and exhaust gases back into the cooling system.

Guy"
 
guyjg said:
"Rod:

I came to the same co

"Rod:

I came to the same conclusion along with another reason; if there is momentary or other blockage in exhaust flow at the "flapper" or past it, the exhaust can't force riser water and exhaust gases back into the cooling system.

Guy"
Click to expand...
Hi everyone I'm new here but have been around boats since I was 13 and was a diesel mechanic for Caterpillar. I see you messing with that thermastat housing. Best bet is to junk the 2nd ersio. Which was a one piece unit. They sell a complete kit on Amazon which I purchased. It is actuallyperfect. One in my book. Mine was rotted pretty bad so I bought a thermastat kit, two risers and two manifolds. What a difference great water flow now runs perfert. In florida the water gets in the 90's so you could just imagine how difficult it is to keep everything cool. My blower I leave on all time which helps too. My suggestion is if the components are in bad shape just bite the bullet and freshen them up. I see how old your boat is, just like mine a 1990 Sea Ray. You really have received good value so far from those parts so don't jury rig. Have a piece of mind when your out on the water so you can have with family and friends and above all think safety..
 
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