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Replacing stock oil pump

 
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moundtop
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Joined: 31 Jul 2015
Posts: 5
Location: Vermillion, South Dakota

PostPosted: Wed Dec 14, 2016 1:47 pm    Post subject: Replacing stock oil pump Reply with quote

Greetings 1966ers.
I am doing a completely stock rebuild of my 1966 F-case engine. Finding the correct intake manifold and 77mm pistons/cylinders was quite a chore. Now I am trying to source a new oil pump. Specifically, I am looking for an oil pump with 6mm studs, small oil gallery holes and 21mm gears. So far, the few 6mm stud pumps that I have found all have gears larger than 21mm (more like 26 or 30mm). Any suggestions for where I can find an oil pump matching the specs given above?
Note: I am interested in a historically accurate stock rebuild so full-flowing the oil pump is not an option for me. Thanks, in advance, for any assistance.
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jmartini
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Joined: 23 Dec 2005
Posts: 1974
Location: Nevada, Texas

PostPosted: Wed Dec 21, 2016 5:55 am    Post subject: Reply with quote

What about this:
http://www.jbugs.com/product/31-2935.html

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darzoom
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Joined: 13 Jun 2011
Posts: 450
Location: Atlanta

PostPosted: Thu Dec 22, 2016 10:18 am    Post subject: Reply with quote

2nd JBugs
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moundtop
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Joined: 31 Jul 2015
Posts: 5
Location: Vermillion, South Dakota

PostPosted: Tue Dec 27, 2016 11:17 am    Post subject: Reply with quote

Thanks for the pointer to the JBUGS EMPI 31-2935 oil pump. However, there a few things about that pump that are very different from the OEM unit. First, it has a cast iron body (rather than aluminum). Second, the pumping gears are 26mm long (much larger than the OEM 19mm). Third, I can find no information regarding the size and alignment of the inlet/outlet ports and suspect that they are oversized (relative to the 1300cc engine's smaller oil galleries).

Based on my research: (1) Cast iron oil pumps are more likely to leak (Bob Hoover); and, (2) the largest oil drive gears that one should use on a stock 1300cc F-case motor is 21mm (otherwise excess cavitation is likely to reduce the operational efficiency of the pump)(ACN).

So....I'm looking for either a NOS OEM oil pump or an aftermarket oil pump with: aluminum body; 6mm cover studs; drive gears between 19-21mm and properly sized inlet/outlet ports. The closest fit to these specs that I have found can be seen at the following URL link:

https://www.vwheritage.com/shop/beetle/311115107K/oil-pump-25-30hp-1-2-1-5-up-to-7-67-with-6mm-studs/?crumbStartPage=1&crumbStartRow=1

Despite my diatribe above, I'd be interested in hearing from anyone who has successfully (or unsuccessfully) installed the JBUGS 31-2935 oil pump in an F-case.

Best regards from Vermillion, SD
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darzoom
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Joined: 13 Jun 2011
Posts: 450
Location: Atlanta

PostPosted: Tue Jan 03, 2017 7:12 am    Post subject: Reply with quote

Try K&K parts in Orlando Florida. They have been in the business for ~40 years and may have a NOS older style pump sitting on the shelf. 1 407-851-6430
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1300
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Joined: 29 Jul 2015
Posts: 39

PostPosted: Tue Jan 03, 2017 9:16 am    Post subject: Reply with quote

Maybe this one? http://www.socalautoparts.com/product_info.php/aftermarket-oil-pump-26mm-gears-6mm-studs-flat-cam-p-12517 or this one will work too http://www.thesamba.com/vw/classifieds/detail.php?id=1680314

Casey
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moundtop
New Member


Joined: 31 Jul 2015
Posts: 5
Location: Vermillion, South Dakota

PostPosted: Tue Jan 03, 2017 2:07 pm    Post subject: Reply with quote

Found a NOS LMB German OEM qualty pump the fits 1961-67 type 1 (6 mm studs, small oil galleriies, 21 mm gears). I have another F case project planned for late summer and will be looking for yet another stock oil pump and NOS 1300 cylinder/piston set (preferablly German).
Thanks again.
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