Figured I would share my new found knowledge on an obscure Sierra thermostat and gasket kit.
So the kit Sierra lists for my 1996 5.7 2bbl A1G2 is the 18-3647 (and the display pack version of 18-3647D). This kit contains the 160 degree thermostat, the correct housing gasket that has the 2 brass rivets near each thread hole as well as the round cork gasket that sits between the thermostat and the housing (and then the white plastic piece then slides in to hold it all together).
It also contains a round rubber o-ring, an incorrect housing gasket that is just too small to fit over the white plastic piece, an incorrect housing gasket that has a cutout for some sort of protrusion and also a gasket that looks to be for some sort of block off plate.
So count them, yep that is right, 4 extra items in this kit that go straight from the box to the trash as I do not need them, have no clue what they are for and clearly do not fit my boat.
All of this for the bargain price of $24.00 (on Amazon anyway).
So a friend of mine just stumbled across a kit that has absolutely no description to it at all.
That would be the 18-3648. If you look it up in the Sierra Catalog, it shows simply as "Thermostat Kit 160".
Hmmm, that is odd. Every other kit lists all of the components that come with it as well as the OE Merc. numbers, why not this one?
He bought it hoping it would work and it only cost $18.76 (on Amazon again).
Now since I had the 3647 and he had the 3648, I decided to compare them. First of all, the 3648 kit only has the thermo, housing gasket and round cork gasket so it does look promising.
I open all of it up and start looking.
Thermostat is identical, same 160 degree, same made in china marking, same exact size. CHECK
Housing gasket is identical, same brass rivets next to bolt holes, same exact size. CHECK
Round cork gasket is identical, same exact size. CHECK
So why am I paying almost $6 more for a kit and then throwing away 4 of the 7 items that come in the box?
NO MORE! I will now be buying the 18-3648 kit as it is the correct kit for my engine and contains only the gaskets I really need.
No more waste or money, no more waste of parts
So for all that do this stuff themselves, check it out and see if those are the gaskets you need. If they are, make the switch and save some cash!