Thermostat replacement 1996 5.7L

[Ed Harris]

when I opened the t stat housing today and retrieved the stat and plastic insert I noticed there was not an o-ring under the stat. When I reinstalled the stat I used an oring then the stat then the insert. How important is the oring in this housing?

 

[thumpar]

For mine it shows insert, thermostat then gasket. Don't know how much that gasket would change things. Might make it a little loose but that's it.

 

[Ed Harris]

Yeah same thing. I installed mine while I had the housing upside down looking into it. I was just wondering about that gasket/oring importance.

 

[Ed Harris]

Can anyone tell me what style outdrive this serial number is 0F865656 ?

 

[San_Diego_SeaRay]

Can anyone tell me what style outdrive this serial number is 0F865656 ?

1996-1997 Alpha One Gen Two per the Mercury Parts Lookup engine.

 

[Ed Harris]

Is there a diagram for the cooling system configuration for engine number 0F790518 ?

 

[San_Diego_SeaRay]

Is there a diagram for the cooling system configuration for engine number 0F790518 ?

There's an exploded view under the Parts Catalog link. Type in the Serial Number in the field provided. You're looking for this on the left hand side (assuming your engine isn't a MAG 350 or 2BBL TBI):

STANDARD COOLING SYSTEM (5.7L/5.7LX ALPHA)

 

[tacx]

According to the manual.

Looking down at the housing.

First the "O" ring.
Then the thermostat.
Then the sleeve.

 

[Ed Harris]

Roger that. That is the order I put them in. 160 tstat and my temp gauge is reading 175 after about 10 minutes on the hose at 1000 rpms. Does this sound about right for this engine?

 

[tacx]

Our 5.7 must have a lower tstat. Will stay around 120 to 130 at a slow cruise. Will go to 150 to 160 pulling tubes and skiers.