How to Disassemble F4 water pump?
How to Disassemble F4 water pump?
I want to completely disassemble my F4 water pump for two reasons:
1 - It needs to be cleaned...BAD!!! The last owner let the bike sit for 2-4 years with all fluids in it and the pump has horrible scale in it.
2 - I want to have the pump cases powder coated black to match the cylinder block (got my cylinder block back today from the coaters).
Has anyone ever disassembled one of these? Can it be done? If so, how?
It seems there is a flared section on the pump shaft (I have attached a picture of what I'm talking about) that might be holding the entire thing together. If that's true, then it might not be possible. My hope is that the flare is just to keep it tight.
Input?
1 - It needs to be cleaned...BAD!!! The last owner let the bike sit for 2-4 years with all fluids in it and the pump has horrible scale in it.
2 - I want to have the pump cases powder coated black to match the cylinder block (got my cylinder block back today from the coaters).
Has anyone ever disassembled one of these? Can it be done? If so, how?
It seems there is a flared section on the pump shaft (I have attached a picture of what I'm talking about) that might be holding the entire thing together. If that's true, then it might not be possible. My hope is that the flare is just to keep it tight.
Input?
Senior Member
Joined: Dec 2010
Posts: 390
Likes: 0
From: I live in Plympton Plymouth
I don't think the pump can be dismantled, but I could be wrong. Water pumps usually have to be replaced and the cost might not be too bad and quicker than trying to dismantle and clean your old one. See what others say.
I want to completely disassemble my F4 water pump for two reasons:
1 - It needs to be cleaned...BAD!!! The last owner let the bike sit for 2-4 years with all fluids in it and the pump has horrible scale in it.
2 - I want to have the pump cases powder coated black to match the cylinder block (got my cylinder block back today from the coaters).
Has anyone ever disassembled one of these? Can it be done? If so, how?
It seems there is a flared section on the pump shaft (I have attached a picture of what I'm talking about) that might be holding the entire thing together. If that's true, then it might not be possible. My hope is that the flare is just to keep it tight.
Input?
1 - It needs to be cleaned...BAD!!! The last owner let the bike sit for 2-4 years with all fluids in it and the pump has horrible scale in it.
2 - I want to have the pump cases powder coated black to match the cylinder block (got my cylinder block back today from the coaters).
Has anyone ever disassembled one of these? Can it be done? If so, how?
It seems there is a flared section on the pump shaft (I have attached a picture of what I'm talking about) that might be holding the entire thing together. If that's true, then it might not be possible. My hope is that the flare is just to keep it tight.
Input?
Well, the water pump will indeed come apart, at least as far as getting the rotor and shaft out.
As far as getting the seals out (there are no bearings in this pump), the #1 problem is the little thin, tin piece that separates the water passage from the weep hole. The blue lock-tight makes it impossible to remove without damaging it. Now, it MIGHT be possible to heat the entire housing up hot enough to make the lock-tight turn loose, but I'm sure that would destroy the rubber seal that is in the weep hole area. That MIGHT not be an issue as it looks like a regular shaft seal (I'll be going to a bearing supply store Monday to try matching the seal). If so, then full disassemble might be feasible. I'm going to attempt making an aluminum insert to replace the tin metal piece and install a standard seal. If it works, yay, if not then I'm not out anything.
So, the process:
You need a 1/4" steel rod (I had some 3/8" and turned it to size). Put the pump in a press and slowly press the rotor off the shaft. It's really simple and provided you are careful about it, it doesn't damage either part (ignore the hole in the middle of my rotor....I drilled that to discover that the shaft was indeed hollow throughout).
When you get ready to reassemble it, just press the rotor back on the shaft.
For most people, I do agree that disassembling the pump really is rather pointless. They are going for as little as $25 on ebay so unless you want to powder coat the pump housing (which I'm not sure you could do unless a feasible solution can be found to get the rubber seals out of it), it's really not worth the effort/risk that it might leak.
But.... at least it "can" be done.
As far as getting the seals out (there are no bearings in this pump), the #1 problem is the little thin, tin piece that separates the water passage from the weep hole. The blue lock-tight makes it impossible to remove without damaging it. Now, it MIGHT be possible to heat the entire housing up hot enough to make the lock-tight turn loose, but I'm sure that would destroy the rubber seal that is in the weep hole area. That MIGHT not be an issue as it looks like a regular shaft seal (I'll be going to a bearing supply store Monday to try matching the seal). If so, then full disassemble might be feasible. I'm going to attempt making an aluminum insert to replace the tin metal piece and install a standard seal. If it works, yay, if not then I'm not out anything.
So, the process:
You need a 1/4" steel rod (I had some 3/8" and turned it to size). Put the pump in a press and slowly press the rotor off the shaft. It's really simple and provided you are careful about it, it doesn't damage either part (ignore the hole in the middle of my rotor....I drilled that to discover that the shaft was indeed hollow throughout).
When you get ready to reassemble it, just press the rotor back on the shaft.
For most people, I do agree that disassembling the pump really is rather pointless. They are going for as little as $25 on ebay so unless you want to powder coat the pump housing (which I'm not sure you could do unless a feasible solution can be found to get the rubber seals out of it), it's really not worth the effort/risk that it might leak.
But.... at least it "can" be done.
Last edited by segraves1; Jul 30, 2011 at 10:51 AM.
Here's the two shots of the tin piece and the inner seal. You can clearly make out the blue lock-tight on the tin piece.
After doing a quick McMaster-Carr search, the tin piece (and it's seal... the thing with the spring under it) look like they MIGHT be a standard pump shaft seal. So I'll check that Monday (cross fingers).
After doing a quick McMaster-Carr search, the tin piece (and it's seal... the thing with the spring under it) look like they MIGHT be a standard pump shaft seal. So I'll check that Monday (cross fingers).
Junior Member
Joined: May 2013
Posts: 8
Likes: 0
From: Hunter Valley NSW Australia
Hi to all, it is now November 2014 and I have been trying to find a replacement water pump for my 1987 CBR 1000F. I have found this discussion very interesting and is most likely my only option to get my bike back on the road. Thanks for the advice.
Junior Member
Joined: Jul 2022
Posts: 2
Likes: 0
Where can I find a water pump for $25
Well, the water pump will indeed come apart, at least as far as getting the rotor and shaft out.
As far as getting the seals out (there are no bearings in this pump), the #1 problem is the little thin, tin piece that separates the water passage from the weep hole. The blue lock-tight makes it impossible to remove without damaging it. Now, it MIGHT be possible to heat the entire housing up hot enough to make the lock-tight turn loose, but I'm sure that would destroy the rubber seal that is in the weep hole area. That MIGHT not be an issue as it looks like a regular shaft seal (I'll be going to a bearing supply store Monday to try matching the seal). If so, then full disassemble might be feasible. I'm going to attempt making an aluminum insert to replace the tin metal piece and install a standard seal. If it works, yay, if not then I'm not out anything.
So, the process:
You need a 1/4" steel rod (I had some 3/8" and turned it to size). Put the pump in a press and slowly press the rotor off the shaft. It's really simple and provided you are careful about it, it doesn't damage either part (ignore the hole in the middle of my rotor....I drilled that to discover that the shaft was indeed hollow throughout).
When you get ready to reassemble it, just press the rotor back on the shaft.
For most people, I do agree that disassembling the pump really is rather pointless. They are going for as little as $25 on ebay so unless you want to powder coat the pump housing (which I'm not sure you could do unless a feasible solution can be found to get the rubber seals out of it), it's really not worth the effort/risk that it might leak.
But.... at least it "can" be done.
As far as getting the seals out (there are no bearings in this pump), the #1 problem is the little thin, tin piece that separates the water passage from the weep hole. The blue lock-tight makes it impossible to remove without damaging it. Now, it MIGHT be possible to heat the entire housing up hot enough to make the lock-tight turn loose, but I'm sure that would destroy the rubber seal that is in the weep hole area. That MIGHT not be an issue as it looks like a regular shaft seal (I'll be going to a bearing supply store Monday to try matching the seal). If so, then full disassemble might be feasible. I'm going to attempt making an aluminum insert to replace the tin metal piece and install a standard seal. If it works, yay, if not then I'm not out anything.
So, the process:
You need a 1/4" steel rod (I had some 3/8" and turned it to size). Put the pump in a press and slowly press the rotor off the shaft. It's really simple and provided you are careful about it, it doesn't damage either part (ignore the hole in the middle of my rotor....I drilled that to discover that the shaft was indeed hollow throughout).
When you get ready to reassemble it, just press the rotor back on the shaft.
For most people, I do agree that disassembling the pump really is rather pointless. They are going for as little as $25 on ebay so unless you want to powder coat the pump housing (which I'm not sure you could do unless a feasible solution can be found to get the rubber seals out of it), it's really not worth the effort/risk that it might leak.
But.... at least it "can" be done.