How to remove a seized raw water pump impeller? (VolvoD12)

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jfm

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Anyone got any ideas for removing a raw water pump impeller that's seized onto its shaft? Volvo D12

I'm using an independent engineer now as my engines are out of warranty. We've discovered a few things the main dealer has apparently billed me for but not done. One of my water pumps has easy access, new-looking impleller, comes off shaft easily. Other pump has difficult access and the impeller is worn and seized onto shaft. Despite the fact I was billed for 2x impellers 12mths ago during the main desaler service. Of course I can't prove, but I believe.

Anyway, those impeller pliers don't shift it. You cant use a traditional puller becuase you cant get the claws of the puller behind the impeller at the back, as its back face is of course hard up agians the pump body. Does anyone have any little tricks to deal with this? Spannerman? Volvopaul? If you do, tell me fast please as he's working on it today!

Thnaks
 
You can get a tool to do it ! I have removed with two pliers before if you do not mind damging the old impeller also a scredriver from the side but with a bit of wood to protect the pump and levering the impleller out.

good luck

Tom
 
Have you tried water pump pliers, they can grip a fair way down the impellor between the blades, or two screwdrivers and work it from side to side.
I know from experience these large impellors can be difficult to get out as there is so much friction, I always spray WD40 into the pump and crank the engine a couple of times to reduce the friction grip of the blades, then they fly out.
 
I have an impeller puller that is a slide hammer.

I am happy to post it to you if you think it will fit.(as long as you agree to post it back)

You need about a foot at the end of the impeller for the slide hammer to work.

What is the internal size of the impeller ?

it fits on the inner rubber bit, the bit the vanes are attached to.

Other than that
Block the outlet pipe and fill it with penetrating oil use a foot pump to then pressure it in.
 
Thanks for all those replies. I have passed them on. He is using proper impeller pliers but no luck. Daka, thanks for the loan offer, but the prob with this one is there is an obstruction in front so you cant slide the hammer on the slide hammer gadget. He's gonna soak it in penetrating oil over the weekend
 
How hard is it to remove the water pump for better access? Its 2 bolts and 2 hoses on mine - so its far easier to whip the pump off when changing the impeller than struggle (and risk dropping the damn woodruff key).

Rick
 
Well, it sounds like the previous Volvo dealer took great care of his customers after all.
He wasn't able to remove the impeller, and invoiced it anyway.
As a result, he assured you a happier boating season, with no worrying thoughts about the risk of loosing one engine... /forums/images/graemlins/grin.gif
 
Thanks Mapis. Let me know if you ever open a boat repair shop, and I might make sure not to visit :-) /forums/images/graemlins/laugh.gif
 
[ QUOTE ]

You cant use a traditional puller becuase you cant get the claws of the puller behind the impeller at the back, as its back face is of course hard up agians the pump body. Does anyone have any little tricks to deal with this? Spannerman? Volvopaul? If you do, tell me fast please as he's working on it today!

Thnaks

[/ QUOTE ]
Generally, pullers don't go behind the impellor- they grip the sides with serated teeth so have you tried this sort (ie Jabsco http://www.boatersworld.com/product/357401041.htm type)? If there isn't much room in front of the pump for the conventional T handle then the solution is to saw off the T piece and either weld a nut on or screw two nuts onto the threaded shaft so they tighten up. Then use a ratchet spanner on the nut to remove the impellor. Works on my D74p pumps where the starboard one is virtually inaccessible.

Nick
 
The problem with d12 impellers is that they are so long, bit like the 63p ones so they grip the pump well.

I always spray them up then try and remove with a modified jabsco removal tool, it fits in nicely grips well and has never failed, it also helps if you prize it with a screwdriver at the same time, you can also remove the screw that holds the cam in, that way the cam will slide with the impeller and reduce the drag between the pump body and impeller.

Good luck, try doing one on the move at sea, I have to!!!
 
I had the problem with my TAMD122:s last Wend. I finally got the impeller out by fastening locking pliers at the central hub of the impeller and pulling from the pliers with an arm long screw driver. I bet with "Spannermans" advice the impeller would have come off in a whizz. Good advice stored in the little black book!
 
I've had success with the Machine Mart battery terminal puller
CHT 7436. It's more compact than the Jabsco puller and costs only £7.04.
 
Just to finish this story, he got the impeller out. His pullers might not have been the right size but after he had cut off the impeller vanes with stanley knife he got his puller claws in and removed them ok

I've learned from this. I carry spare parts inc impeller but I have learned that I wouldn't have been able to change impeller at sea. So I've bought the official impeller puller from Jabsco, £50 potentially money well spent. http://www.cleghorn.co.uk/item.asp?ls=50070%2D0200&v=8A3982A7D1CC454DB0963711CCDCC36F&id=997

My mechanic tells me the impeller shaft has a hole down the centre with a M6 female thread, and you use a bit of M6 studding, penny washer and nut/spanner to push the new impeller in. So it's no wonder they're so hard to get out!

Moral of this story is that if you, like me, carry all relevant spare parts you also need to rehearse whether you can actually install them! I will from now on have the puller and the inserter-studding but until now I didn't. I suggest abnyone who carries spare parts and hasn't thought about this does so, esp on engines that have long (in the axial sense) impellers in their pumps like the D12 pumps

All's well that ends well! Thnaks for advice on this
 
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