replacing impeller

[goodoldboat]

think my Impeller needs replacing ...

other than the new impeller which I have .. what tools do i need ..

Is there an new gasket needed ?

I want to have every I need on hand .

[ndutton]

Assuming you have an Oberdorfer pump (probably the most common) you'll need:

• Screwdriver for the cover machine screws
• Needle nose pliers to grab the impeller+shaft assembly and pull it out of the pump
• Snap ring pliers
• Impeller
• New cover plate gasket - you can make a temporary gasket out of a dollar bill until your MMI order arrives
• Grease for the grease cup

If removing the pump to perform the replacement (not absolutely necessary but recommended), add:

• 9/16" socket, extension, ratchet, possibly box wrench
• New flange gasket

[romantic comedy]

I have had success with making the gasket from paper grocery bags.

[goodoldboat]

water pump

its a late model engine . so I assume its an oberdorfer.

[JOHN COOKSON]

GOB
Before you order pull the shaft out of the pump. If the shaft is scored where it contacts the seals you will need a new shaft and new seals. If the pump is not leaking now with a scored shaft it will soon start leaking.
I use boat trailed waterproof wheel bearing grease in my grease cup. It works well. Way back many years ago one could buy "water pump grease". Good luck finding it now days. Maybe it is sold on line. I've never checked.

TRUE GRIT

Edit: Order more than one gasket. That way you will have a spare when you need it.

[goodoldboat]

impeller

Thanks to all the good advice on this . The new impeller will be quite stiff , is there any method used to install the new impeller in the housing ?

[GregH]

So what do you folks recommend for us Canucks and our plastic bills?

- and I haven't seen paper bags in years! Lol

[ndutton]

So what do you folks recommend for us Canucks and our plastic bills?

Send a few of them to MMI and get real gaskets in return.

[roadnsky]

its a late model engine . so I assume its an oberdorfer.

Does it look like one of these two?

[JOHN COOKSON]

The new impeller will be quite stiff , is there any method used to install the new impeller in the housing ?

Bend the impeller blades and twist it a bit as you install it. If he blades are to stiff to install the new impeller easily toss it it's pretty much a goner.

TRUE GRIT

[Nanook]

Like many things in life, a little lube goes a long way. A little mineral oil, Vaseline, olive oil, etc. rubbed on the inside of the housing and/or across the edges of the blades really helps prevent premature burnout if there is an initial delay in water flow.

Some folks have used some light line wrapped around the impellor to bend the blades into initial shape. It can be pulled off the rubber after it is started into the hole and before fully bottomed out.

[GregH]

Send a few of them to MMI and get real gaskets in return.

On my to do list already ... and more things like the harness kit, water pump back plate kit, water pump bolt extender, etc etc..

[sastanley]

So, GOB, what indications makes you think the impeller needs replacing?

A valid answer is, "I have no idea when the PO did it..", or "The engine has several hundred hours on it since it was replaced last."..

I am just asking.

[goodoldboat]

impeller

the engine is running a little warm and seeing steam out of the
rear exhaust under load .I have checked all the 90 * elbows raw water input done an acid wash installed the by pass valve ..

and the
water flow from rear manifold outlet is not what it should be .

The PO says that is twas done last season .. but he was a little fuzzy ...

I figured it couldn't hurt to take a look at the impeller ? its the last invasive
thing to look at ?

[sastanley]

Hmmm..OK, I dunno then. my water temp on the motor varies with sea water temp...and I am FWC.

What I was getting at is a new impeller should perform the same as an old impeller provided all the vanes are intact. A new impeller is not going to magically pump more water thru the system and cool the engine down.