simon k wrote:
a fella in SA found that the shaft was only pressed in, no knurling or anything - so it slipped
Well, I suppose that is another way of doing oil pressure relief, an oil pump with a clutch of the shaft
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| What are my oil pump options, 1275 Cooper S? https://www.ausmini.com/forums/viewtopic.php?f=2&t=67085 |
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| Author: | isleblue65 [ Thu Nov 18, 2010 2:03 am ] |
| Post subject: | What are my oil pump options, 1275 Cooper S? |
Hi all, I bought GLP142 from Minispares because it was the only pin drive pump they have, however the shaft is 1cm too short and the impeller has 4 lobes instead of 5 like my old original S pump. I can easily press out the shaft off my old pump and swap them, but I want' to make sure the new 4 lobe pump will push enough oil. As said in the title, it is an original Cooper S 1275 from 1965 with pin drive cam. The Minispares description for GLP142 is: original short pin drive oil pump for all Pre a Plus minis with 850/998/1100ccc engines except autos and others with star drive or the later slot drive pumps as found on A Plus blocks Thanks! |
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| Author: | GT mowog [ Thu Nov 18, 2010 6:05 am ] |
| Post subject: | |
I haven't seen a 5 lobe pump for yonks. They maybe out there, but I doubt it. You can get Replacement Cooper S Oil Pumps from APT, just bolt on, no shaft changing or mods. http://www.aptfast.com/ Go to APT Parts, then select A Series Parts, then Engine Components & Misc. I have used a few of these and quite happy with them. |
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| Author: | simon k [ Thu Nov 18, 2010 9:46 am ] |
| Post subject: | |
you can get a spade drive adapter welded into your cam, then you have a heap of options for pumps talk to Dr Mini about the adapter |
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| Author: | Mick [ Thu Nov 18, 2010 10:28 am ] |
| Post subject: | |
I had problems two and a half years ago sourcing one, they were out of stock all over. But they seem to not be a problem anymore. http://www.minisport.com.au/prod1766.htm |
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| Author: | isleblue65 [ Thu Nov 18, 2010 10:42 am ] |
| Post subject: | |
It looks like the only difference is the length of the shaft. Aside from the original pump having 5 lobes and my new one with the 1cm shorter shaft having 4 lobes, they both have the same inside dimensions. Can anyone confirm that the volume of oil moved by the small bore (shorter shaft) and Cooper S (long shaft) pin drive pumps is the same? If so, I can swap the shafts in about 10 minutes and save having to spend another $60 plus shipping for a long shaft pin drive pump. Still a lot easier than removing the cam and welding a fitting on the end too. |
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| Author: | Mick [ Thu Nov 18, 2010 10:55 am ] |
| Post subject: | |
The old pumps were keyed in, but are new pumps still done this way or swaged? You might have problems if this is the case, no harm in trying however. |
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| Author: | GT mowog [ Thu Nov 18, 2010 11:24 am ] |
| Post subject: | |
The pumps are the same as far as volume of oil goes, however as Mick has pointed out ^ you can't change the shaft in most new pumps. |
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| Author: | simon k [ Thu Nov 18, 2010 12:10 pm ] |
| Post subject: | |
a fella in SA found that the shaft was only pressed in, no knurling or anything - so it slipped |
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| Author: | GT mowog [ Thu Nov 18, 2010 2:10 pm ] |
| Post subject: | |
simon k wrote: a fella in SA found that the shaft was only pressed in, no knurling or anything - so it slipped
Well, I suppose that is another way of doing oil pressure relief, an oil pump with a clutch of the shaft
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| Author: | drmini in aust [ Thu Nov 18, 2010 3:07 pm ] |
| Post subject: | |
As said you can convert a pin drive pump into slot drive by TIG welding my adaptor into it. Lots have been done this way recently. See http://www.ausmini.com/forums/viewtopic.php?t=39787 Also, Minisport SA was going to retrofit some 998 drive pumps with a longer Oz made S length shaft. I spoke with Andrew at the time, but not sure if it has happened. |
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| Author: | isleblue65 [ Thu Nov 18, 2010 3:29 pm ] |
| Post subject: | |
The good news is that the old longer shaft is 0.001" larger diameter than the new pump's shaft. Once I pressed both shafts out, the long shaft pressed into the 4 lobed spider nice and firm. The short shaft slips right in and out of the old 5 lobe spider. All done and fitted. Kevin, maybe the next time round I'll give your adaptor a go! |
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