Thermostat Repair Kit (140°F) – Fits Mercruiser 2.5L/3.0L 120/140/165 HP (Replaces 59078Q3, 59078T3, 59078T4) 270HP 25 male adapter

25 male adapter

876294) with your engine's service manual or existing parts

46-96148A5

The most common indicators are milky or water-contaminated gear lube

Place a new gasket on the housing and reinstall the cover

Thermostat Repair Kit (140°F) – Fits Mercruiser 2.5L/3.0L 120/140/165 HP (Replaces 59078Q3, 59078T3, 59078T4) 270HP 25 male adapterProduct Details This Thermostat Repair Kit (140F) Fits Mercruiser 2. 5L 3. 0L 120 140 165 HP Engines is engineered to restore proper engine operating temperature in a range of GM based MerCruiser powerplants. It's designed for 4 cylinder (2. 5L 3. 0L) and 6 cylinder inline engines manufactured between 1964 and 1997, ensuring reliable performance in raw or freshwater cooling systems. This kit serves as a direct replacement for Mercruiser part numbers