Globe Run-Dry Impellers - My Experience

[vabeach1234]

Well I changed my raw water pump impeller to a Globe Impeller. You are supposed to be able to run the impellers dry for up to 15 minutes with out harm to the impeller. I'm sure the engine wouldn't like that though. Anyways. Took the boat out for a quick spin after setting the timing after switching to a electronic ignition pickup instead of points (the first time running it with the new impeller). She ran great. On the way back in I got her up to 3600 rpms at WOT, bottoms a little dirty. Coming of plane the exhaust sound changed. Then the temperature started climbing. Turned off the motor and checked it with a infared temp gun. Sure enough running hot. We started it and stopped it about 5 times to get it to a dock without the temp getting over 230 degrees. There I pulled the raw water pump and sure enough the impeller wasn't spinning. The shaft key edges rounded some also. The globe impeller has a composite core, not metal like the Sherwood impellers. Sure enough the key slot was stripped and the impeller core was cracked, so the pump shaft was spinning without the impeller turning. Changed out the impeller to the older one (Sherwood brand) and still had enough bite on the key to lock it in. Was able to get back to my slip without problems after that. So lesson learned. No aftermarket parts for critical items, like impellers.

Also, you might want to change out the key next time you switch out your impellers.

[The Dog House]

Thanks for letting us know. I've thought about trying the run dry impellers but I'm glad I stuck with the Sherwoods.

[aaronbocknek]

BOTTOM LINE... GLOBE IMPELLERS SUCK!! i ran this by my mechanic two years ago when i was swapping out impellers on the tri cabin. john said to me, ''they are great. if you want to ruin your engine and exhaust hoses.'' he went on to explain that they have a terrible failure rate. now, i know, that some folks will not agree with me or him, but, i will stick to the OEM (sherwood) standard. i buddy of mine a few slips away from me did not listen when he asked me what type of impeller to use. i said to stay away from the 'run dry' globe impeller. didn't listen. bought the globes. BOTH of them fried roughly 200 yards out of his slip. when removed, sure enough, the inner core was shredded. now he uses the ones with the metal core. live and learn. the hard way.

[yorklyn]

good info to have , Thanks!

[RWS]

no first hand experience here, but I heard they were narrower (in my genny application)

led to less than adequate flow rate.

RWS

[prowlersfish]

no first hand experience here, but I heard they were narrower (in my genny application)

led to less than adequate flow rate.

RWS

Heard the had the same issues in Cummins .