Impeller Torque specs

[Enlowe]

I enjoy working on my boat and follow the service manual for guidance. Recently replaced the impeller on my 2001 260DA with a 5.7. The service manual said to torque the impeller housing to 30 ft lb. I was skeptical but followed the guide. Well a bolt housing has cracked. Could the service manual be wrong? What are your experiences here.

 

[Nater Potater]

Those torque settings are for the engine side of things. That's the cast iron engine's water pump you're reading. Without doing a lot of digging for actual torque settings, that should be down somewhere in the inch-pound realm.

 

[Thornton69]

Is that an OEM kit you used? The impellers are a lot lighter with the chinese junk and won't stand up as well. Reading reviews on amazon, there appears to be a lot of counterfeit kits being sold as Merc. The OE Merc kits (46-807151A14) come with new screws and believe they were torqued to 20 ft/lbs in the last kit I did.

 

[Brite Idea]

I'd say it's wrong. I just found a post from 2015 addressing this as Mercury printed the wrong information. The correct torque specs are 15-20 foot pounds.