BB marine
Well-known member
- Joined
- Feb 1, 2016
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- 2,905
- Fluid Motion Model
- R-21
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- Mainship 34 Pilot
- Vessel Name
- PORT-A-GEE
I replaced the impeller for the D3 220 hp Volvo today. This was routine replacement 234 hrs on the engine Two seasons of use. All fresh water, no groundings. I didn't expect to find any issues with the impeller. When I removed it I was surprised to see 2 vanes damaged almost 180 degrees apart. The rest of the impeller looked like I would expect slight set with minimal wear.The pump housing looked good no scoring. The face plate of the bearing housing portion of the pump had some wear at the narrow part of the eccentric. Other then that it looked good. I have seen impellers destroyed from dry rot and old age or being run dry . I have seen impellers loose efficiency because they have a bad set to them. This one has me puzzled, not much of a set, no dry rot cracks, the vanes are very pliable, not much wear, but 2 damaged vanes.

the damage is 180 degrees apart


the damage is 180 degrees apart