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Water pump impeller

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Rich K
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Water pump impeller

Postby Rich K » 21 Apr 2024 20:54

Hi all,
Just refurbishing a 12 vane water pump and unfortunately cracked the impeller while trying to ease it off the shaft despite being as gentle as possible.
I have a spare used impeller which has a damaged blade and I am considering whether or not to use it. I am fairly sure that it will still flow sufficient water, but my concern relates to any potential imbalance that might manifest at higher revs due to the damaged blade.
Any advice would be greatly appreciated.
Thanks,
Rich.
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379C9CBA-4534-42FC-BF40-5A8AFB01E10B.jpeg
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1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

Cobber
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Re: Water pump impeller

Postby Cobber » 22 Apr 2024 04:12

Bin it, new ones can’t be all that hard to come by.
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.

Rich K
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Location: Worcester, United Kingdom

Re: Water pump impeller

Postby Rich K » 22 Apr 2024 10:00

Hi Cobber, thanks for your reply. I can’t seem to find a source of new impellers anywhere over here, only new pumps at over £300 from all the usual Triumph part suppliers; hence my hope to use the spare used one.
1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

Cobber
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Re: Water pump impeller

Postby Cobber » 22 Apr 2024 13:18

They were readily available last time I looked, mind you that would’ve been a fair while ago.
The same part was used in Stags and Dolomites and someone may well correct me here but I think some of the old Saab99s too.
There were both 6 and 12 vane versions, I do seem to remember that there was bugger all difference in overall performance between the designs.
But maybe the supplies have dried up, it maybe time to bin that bloody awful design and go to an electric water pump, a bit of buggerising about but it will solve the problem once and for all.
If you were to look back and do a search though the old treads and posts here there was a bit about this.
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.

FI Spyder
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Re: Water pump impeller

Postby FI Spyder » 22 Apr 2024 16:08

Yeah, they went from 6 vane to 12 vane to increase water flow. Whether it did or not is a matter of speculation as engines still overheated most probably because older rads became more plugged up from sediment and owners not taking the step of power cleaning or recoring their radiators but blaming coolant flow instead. I remember Hasbeen saying his TR7 never overheating, I know mine never did, even in hot stop and go driving not moving the needle more than a needles width. Mind you it's a FI model, always giving the 14:1 intake ratio. The old rad leaked so got a recored one to replace it.

There has to be used impellors out there some where. Especially in the UK where they were in other models not found in N/A.
- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 2013 Volt - Yellow TCT

HDRider
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Re: Water pump impeller

Postby HDRider » 22 Apr 2024 16:58

Be careful which water pump you purchase. There are some aftermarket ones with improperly hardened gears which will quickly ruin you jackshaft.

The pump cover is different for a 6 or 12 vane pump as well so you must change both parts if you upgrade you pump.

Edward Hamer
Petaluma CA

Rich K
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Joined: 08 Aug 2015 18:04
Location: Worcester, United Kingdom

Re: Water pump impeller

Postby Rich K » 22 Apr 2024 20:28

Thanks Cobber, FI Spyder, and HDRider for your thoughts.
Sources of impellers do seem to have dried up unfortunately. Both 6 and 12 vane complete pumps are readily available from specialist suppliers but the prices are ridiculously high.
1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

Cobber
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Re: Water pump impeller

Postby Cobber » 22 Apr 2024 23:57

If a decent pump impeller can be found then in might be a good candidate for 3D scanning, then that leaves open the possibility of 3D printing.
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.

Rich K
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Posts: 291
Joined: 08 Aug 2015 18:04
Location: Worcester, United Kingdom

Re: Water pump impeller

Postby Rich K » 23 Apr 2024 10:54

I like that idea.
1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

Cobber
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Re: Water pump impeller

Postby Cobber » 23 Apr 2024 13:09

I’ve often thought that a library of 3D scans of obsolete parts should be compiled
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.

Rich K
Wedge Pilot
Posts: 291
Joined: 08 Aug 2015 18:04
Location: Worcester, United Kingdom

Re: Water pump impeller

Postby Rich K » 24 Apr 2024 21:00

That would be good. Not sure if anyone on this forum has the required skills and kit.
Might have to resort to epoxy repair putty to get my pump up and running.
1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

Rich K
Wedge Pilot
Posts: 291
Joined: 08 Aug 2015 18:04
Location: Worcester, United Kingdom

Re: Water pump impeller

Postby Rich K » 26 Apr 2024 22:27

Repaired the impeller with epoxy repair putty and have reassembled the pump and housing with new bearing and seals etc. Will be refitting to the engine tomorrow.
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F6C7B3BD-41A3-4734-9853-674A5A4042AB.jpeg
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BC1A151D-C761-4DA5-8FC1-9777AE915BCE.jpeg
BC1A151D-C761-4DA5-8FC1-9777AE915BCE.jpeg (88.9 KiB) Viewed 9443 times
1980 TR7 drophead now repainted and started refitting plus V8 upgrade
1977 TR7 fixedhead awaiting restoration
1981 TR7 drophead bodywork and mechanicals now done, completing trim currently.
Ford Ranger Wildtrak
Jaguar XKR Supercharged

dursleyman
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Re: Water pump impeller

Postby dursleyman » 27 Apr 2024 14:14

Someone was selling new N/C machined aluminium impellers but I can't remember where I saw it.
It was one of the Dolomite Sprint engine specialists.
Russ

1981 TR7 Sprint DHC & 1977 TR7 Sprint FHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

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Cobber
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Re: Water pump impeller

Postby Cobber » 28 Apr 2024 00:27

Might’ve been Sprintparts in Sydney, I don’t think that they’re still trading anymore
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.

dursleyman
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Re: Water pump impeller

Postby dursleyman » 28 Apr 2024 15:41

Cobber wrote:Might’ve been Sprintparts in Sydney, I don’t think that they’re still trading anymore


Think you are right Cobber, might well have been them.
Russ

1981 TR7 Sprint DHC & 1977 TR7 Sprint FHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

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