Thermostat on a 1987 Mercury 20xd

[zackduncan40]

Where is the thermostat on a 1987 Mercury 20xd and also, whenever I start the engine up should it automatically start peeing out of the pee hole or does it have to get warm before it starts peeing?

 

[flyingscott]

That one we need the serial# for 2 block designs for that motor 1 has the thermostat one doesn't. If you have a thermostat the housing is where the tattle tale hose attaches to the water jacket will be a thermostat housing on the left side of the block. If it does not have a thermostat the hose comes straight out of the water jacket in the middle. Waterflow will be a strong stream right away with NO thermostat, if you have a thermostat it will piddle until the thermostat opens then a strong stream.

 

[zackduncan40]

0B115204 is the serial number.. The pee hole comes out of the middle of the back of the engine, above the spark plugs. I just took the mount off and there was no thermostat in it, is there supposed to be a thermostat right there in that hole or is it made without a thermostat right there?

 

[GA_Boater]

These are the two different 20XD blocks.

No thermostat;



With thermostat;



The arrows point to the tell tale elbow with no thermostat and on the bottom snip, the arrow is to the thermostat housing.

If you had to remove two bolts to undo the housing, item #38 in the bottom snip, there should be a thermostat. If all you have is an elbow and no housing, you have no thermostst.


Can you tell which set up you have?

 

[flyingscott]

0B115204 is the serial number.. The pee hole comes out of the middle of the back of the engine, above the spark plugs. I just took the mount off and there was no thermostat in it, is there supposed to be a thermostat right there in that hole or is it made without a thermostat right there?

You do not have a thermostat that starts at serial # b118

 

[zackduncan40]

These are the two different 20XD blocks.

No thermostat;



With thermostat;



The arrows point to the tell tale elbow with no thermostat and on the bottom snip, the arrow is to the thermostat housing.

If you had to remove two bolts to undo the housing, item #38 in the bottom snip, there should be a thermostat. If all you have is an elbow and no housing, you have no thermostst.


Can you tell which set up you have?

Mine looks like the bottom diagram, the elbow screwed into what looked like a housing and that was held into place by two bolts and it had a gasket; but inside the hole there wasn't a thermostat, but it kinda looks like there should be one there.. I'll post a picture later... If it is supposed to have a thermostat, would it be okay to leave it without one? Or do I have to put a thermostat in?

 

[zackduncan40]

No Title

 

[flyingscott]

Does it look like this your pic is blurry if yes, you have a thermostat. Yes you should put one in there they run better sorry b114 starts the design 2 block

 

[GA_Boater]

With no thermostat, the motor will run colder than designed and take longer to warm up. I would put one in.

 

[zackduncan40]

Yes flyingscott that is what it looks like! Do you guys know a part number for the right thermostat and gasket? Seems like every time I try to get a part on my own without a part number I get the wrong thing lol.. Thanks for all the help!!

 

[flyingscott]

The paper gasket for the housing is
Sierra #18-0323
Quicksilver #27-14318005
Thermostat #s are
Quicksilver # 14586
sierra # 18-3549
Rubber gasket for thermostat # is
Quicksilver #27-62386001
Sierra #18-0182-9
You need a total of three parts for it 2 gaskets and the thermostat.

 

[GA_Boater]

For parts like these I prefer OEM (Quicksilver by Mercury). Only the thermostat is OEM. The parts list is here - http://www.iboats.com/Cylinder-Block...iew_id.1695871

You need items 39, 43 and 41.

Item #39 is not available as OEM. The Sierra part is here - http://www.iboats.com/Boat-Parts-Acc...erra%2018-0323

Item # 43 is also not Available OEM, the Sierra part is here - http://www.iboats.com/Boat-Parts-Ac...ed.1--**********.594860230?q=sierra 18-0182-9