thermostat housing/ lines

[N0 Luck]

I have a new engine from michigan motors (5.7 vortec) the thermostat has only 4 hose barbs on it. My old one has 6... (power steering cooler, water pump, both risers, and below the exhaust manifolds).
The question is do I not run hoses to the risers and keep them plugged?
Im not sure if this is ok or if ill get hot spots somewhere

This is on a 89 alpha one, gen one setup (also the old motor was a 5.7 260 hp)

 

[Bondo]

Re: thermostat housing/ lines

This is on a 89 alpha one, gen one setup (also the old motor was a 5.7 260 hp)

Ayuh,... Do you have the old T-stat housing,..?? Is it servicable,..??

I think you'll Need it, Not the 1 that came on the new motor...

 

[starsnstripers]

Re: thermostat housing/ lines

No Luck you have a private message. I think they sent you a housing for a closed cooling system and you need one for a raw water system.

 

[N0 Luck]

Re: thermostat housing/ lines

Mine is about all coroded away

ok.... after searching around it looks like I originally had a 16413A which is now 87290A23 but iboats doesnt have it

 

[starsnstripers]

Re: thermostat housing/ lines

Look in a newer merc manual i just noticed that there is a newer style 4 conection for raw water cooling, you may be able to use it if you look at the cooling plumbing diagrams. Is this what you have? see attached

 

[N0 Luck]

Re: thermostat housing/ lines

close but mine is in the #9 manual on page #569.... this is old and new attached

 

[starsnstripers]

Re: thermostat housing/ lines

Is this your neww one? Part # 860266A3 ? It's a newer style see attached. It can be used for raw water cooling Design III

 

[N0 Luck]

Re: thermostat housing/ lines

mine is stamped indmar 53-5022.... that diagram does look like it. Thats why i asked the original queston of leaving out the riser hoses. I dont want to gamble with the heat though

 

[starsnstripers]

Re: thermostat housing/ lines

I found it. It says it's for raw water cooling only. Just need to figure out how it's plumbed i guess.

 

[Bondo]

Re: thermostat housing/ lines

Ayuh,... The old 1 has the popet-balls,... You have the Alpha 1 with the smaller waterpump,...
You NEED another copy of the Old Housing....

Otherwise you're going to be chasing an Overheat at Idle situation,...
Til you install a copy of the Old Housing...

 

[N0 Luck]

Re: thermostat housing/ lines

Ayuh,... The old 1 has the popet-balls,... You have the Alpha 1 with the smaller waterpump,...
You NEED another copy of the Old Housing....

Otherwise you're going to be chasing an Overheat at Idle situation,...
Til you install a copy of the Old Housing...

Thanks Bondo, looks like im going to get the old one in service... chasing the correct parts for this housing is proving to be frustrating. Is there a part# teardown of all the gaskests and housing parts I can get to?