4.5L Thermostat Replacement Pics

TomB985

Petty Officer 1st Class
Joined
Apr 4, 2011
Messages
213
Good evening, everyone. I haven’t seen many posts about 4.5L repairs, so I wanted to share the photos I took this morning of my thermostat replacement. This one started sticking open last week at 1,110 hours, so I wanted to replace before it thought about sticking shut.

Points to Merc for placing it front and center, but I really wish they used a gasket that came off easily. I probably spent an hour cleaning up the sealing surfaces, but the second gasket under the thermostat came off in one piece.

Parts used:
- 8M0204687 - thermostat sealing gasket
- 8M0079167 - housing gasket
- 8M0089715 - 140º Thermostat

Parts total from boats.net was $33.54 plus shipping.

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silverbul

Petty Officer 1st Class
Joined
May 19, 2023
Messages
304
but I really wish they used a gasket that came off easily. Don't we all brother.
 
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