Guys read the post he did that. Also Merc's have a pump in the drive like an outboard. I have actualy never done one because I have always had Volvo drives. Volvo's only have a pump on the engine.

Impellers last 4-5 years, unless you run them dry or in silt.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200