Impeller Question

[cortez]

Hi all<br />Just a quick one can i change the impeller while the boat is in the water,and do i need any special tools.Volvo 5.7dp

 

[Dunaruna]

Re: Impeller Question

Someone will be along to confirm or deny this, but I'm pretty sure you have a front crank mounted raw waterpump. In or out of the bath - doesn't matter.<br /><br />Special tools - maybe<br /><br />Manual - definetly

 

[cortez]

Re: Impeller Question

Your right i do a have front crank mounted raw waterpump.I think what i am concerned about is the motor is mounted quite low down in the boat<br />(crownline 250cr)and worried that water will be able to enter while doing the impellor.<br />Manual is on order,many thanks.

 

[Don S]

Re: Impeller Question

What year Volvo 5.7DP?

 

[whywhyzed]

Re: Impeller Question

Just stick a cork or socket (with a shorty extension on the inside to plug the square hole in the socket) in the water line. You might take a brief shower, but the pressure isn't that high. As soon as you lift the hose above the waterline, flow will stop.<br /> Maybe you want to lift the boat and install a raw water shutoff.... Not sure about UK, but my insurance company made me put one on as it was reported by the surveyor that i didn't have a shutoff when I had the boat surveyed prior to purchase... I never got a straight answer about whether Canadian coast gaurd requires it.<br /><br />I only started the boat once with it shut... I knew that was going to happen and that's why i didn't want one but...

 

[cortez]

Re: Impeller Question

The engine number is 410015250 and the year is 1993 the pump is a johnson 4 hole front plate.

 

[Don S]

Re: Impeller Question

Not sure which engine you have yet, the serial number is short 1 number, and a 93 engine didn't have that type pump. But since you have the Johnson pump, I'll assume (Danger, Danger) you have a 570, a 571 or 572.<br /><br />

<br /><br />A little water will get into the boat when you remove the hose and plug it, but your bilge pump will take care of that with no problem.<br />For that matter, stuffing a rag in the hose would slow it down enough to change the impeller.

 

[cortez]

Re: Impeller Question

Thanks for your very quick reply DON your diagram is spot on, the engine is a 572ps,any special tools you think i may need.

 

[cortez]

Re: Impeller Question

sorry about this should of been in last post when i ordered parts choice was 6 hole jabsco or 4 hole johnson.Once again many thanks

 

[Don S]

Re: Impeller Question

Just one special tool that I know of that will help you with your engine, it's part number 7732736 and is called a service manual.

 

[cortez]

Re: Impeller Question

Many thanks don,i feel confident now to change impeller and not sink boat, service manual is on order.