Sierra 18-3569 Thermostat Kit, Mercury 70-125HP 2 Cycle
- Brand:
- Sierra
- Part no:
- 18-3569
Image: Wholesale Marine
Where to buy
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The Sierra 18-3569 is a thermostat kit for various Mercury and Mariner 70-125hp two-cycle outboards, 1987 and newer. Sierra designs its kits to meet OEM specifications. The kit holds an 18-3549 thermostat with a 120°F temperature rating, plus an 18-0182 gasket and an 18-0339 gasket. Engine models are listed by serial number range, so check yours against that list.
Our take
The 120°F rating and the pair of gaskets, 18-0182 and 18-0339, are the points of this Sierra kit. Both gaskets come with the 18-3549 thermostat, so the job does not need separate seals. Check your serial number against the model list.