How Often To Change Raw Water Impeller

buzzk · Post by **buzzk** » Tue May 13, 2008 6:16 am

My mechanic cleaned my intercoolers yesterday. I'm having him change my raw water impellers too. How often is everyone else changing their impellers? Last time I changed my impellers the rubber had broken loose form the hub. But my engine was still not overheating. Buzz

TBonedad · Post by **TBonedad** » Tue May 13, 2008 7:03 am

Buzz - I think the engine manual calls for a 250 hour service interval on the impellers (don't take that as gospel, I don't have it in front of me) The reason I can't remember the specified service interval is becaus I simply change mine annually.

lobsta1 · Post by **lobsta1** » Tue May 13, 2008 7:05 am

Buzz, I do it on a biannual basis. I think if I were operating in shallow sandy waters it would be annually. Al

buzzk · Post by **buzzk** » Tue May 13, 2008 8:12 am

I have been changing my on an annual basis and most of the time they need it. On my outboard I change it every other year. I used to own a boat with Detriots and it seems like they lasted longer. Buzz

Post by **dougl33** » Tue May 13, 2008 8:53 am

Try switching to Tony Athen's impellors. The stock sherwood one's suck.

IRGuy · Post by **IRGuy** » Tue May 13, 2008 3:13 pm

I have some of Tony's impellors as well as a spare rebuilt raw water pump always on the boat. I can't see any physical difference between Tony's impellors and and the Sherwoods, but I trust Tony's word that they are better. I found it almost impossible to remove an impellor from the pump without breaking off some veins, so I carry a whole spare pump. BTW.. My local diesel guy showed me some impellors he has on his shelf.. the metal insert in the rubber has a section of threaded inner surface.. making it easy to remove them.. screw in the appropriate bolt and the impellor comes out without pliers or any other tools he says. Frank B - IRGuy@aol.com "Phoenix" 1983 FBC Wilmington, NC

buzzk · Post by **buzzk** » Tue May 13, 2008 3:36 pm

Frank, have you had to change one of Tony's impellors? Buzz

smanni · Post by **smanni** » Tue May 13, 2008 7:29 pm

every year - I figure its cheap so why not.

IRGuy · Post by **IRGuy** » Tue May 13, 2008 9:15 pm

Buzz.. no, I haven't had to remove one yet, but I do have one installed now, which I put in about 40 engine hours ago. BTW.. for anyone who needs to replace an impellor.. a tip I just read in a magazine.. take a proper sized hose clamp and use it to compress the vanes of a new impellor, then you can get it inserted part way into the housing without having the hassle of trying to get the vanes to collapse all at one time. In fact, if you use two clamps you will have a much easier time. Frank B - IRGuy@aol.com "Phoenix" 1983 FBC Wilmington, NC

lobsta1 · Post by **lobsta1** » Tue May 13, 2008 9:16 pm

Frank. I must be getting old as I have always done it that way. Al

IRGuy · Post by **IRGuy** » Wed May 14, 2008 5:13 am

Al... You and I must have been born old! Frank B - IRGuy@aol.com "Phoenix" 1983 FBC Wilmington, NC

lobsta1 · Post by **lobsta1** » Wed May 14, 2008 5:45 am

Buzz, Sorry to hijack your thread. Frank, The Fein Multimaster is great at cutting off teak plugs. I did over 50 of them the other day in about 10 minutes! Al

buzzk · Post by **buzzk** » Wed May 14, 2008 6:07 am

I'll keep changing mine every year. It's cheap protection. Buzz