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virusdoc
Samba Member
Joined: August 13, 2018
Posts: 525
Location: Durham, NC, USA
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 Posted: Thu May 13, 2021 11:38 am Post subject: Oil pump stud penetrates case |
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While assembling my lower end with a new AS41 case, and threading in the oil pump studs (which were ridiculously tight--had to double nut them and use a ratchet), I foolishly expected the resistance when the studs bottomed out to be obvious. It was not, and on two of the four studs I punched through the case. I was surprised there is only about 1.5 mm of metal behind those.
The metal debris was easy to extract, and I feel like there is nothing I need to be worried about here because the oil pump nuts will be well sealed with Permatex 3H and o-rings once the pump is on, plus Permatex and a paper gasket at each junction. But I thought I'd poll the experts here. Do I need to seal the back side of the stud up, perhaps with JB weld? I don't have the ability to magnesium weld.
Thanks!
_________________
1976 Convertible Super Beetle, "June Bug".
FI-->34PICT3 carb conversion-->now dual 40 IDFs
Self-rebuilt 1904 (after totally botching a 1641 rebuild, cussing a lot, and throwing lots of cash in the fire) |
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Starbucket
Samba Member
Joined: April 30, 2007
Posts: 4025
Location: WA
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| Posted: Thu May 13, 2021 2:22 pm Post subject: Re: Oil pump stud penetrates case |
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| If the studs were that tight I don't think any oil will get past them since it will only be splash not pressure and no JB inside the case. |
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31362
Location: Hot Arizona
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| Posted: Thu May 13, 2021 2:26 pm Post subject: Re: Oil pump stud penetrates case |
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I'm thinking that I'd use blue or red Loctite sealer on those threads.
And if you use 8mm x 1.25mm bolts, we won't tell. The CB Maxi2 pump/filter comes with allen head bolts; have those on both my VWs.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51131
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu May 13, 2021 4:25 pm Post subject: Re: Oil pump stud penetrates case |
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I hope you take away a lesson from this, if the fastener is putting up that much of a fight it may be time to find out why before cramming it in.
As already mentioned it's not likely to leak so carry on.
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Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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Слава Україні! |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26785
Location: Colorado Springs
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| Posted: Thu May 13, 2021 4:52 pm Post subject: Re: Oil pump stud penetrates case |
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Most VW cases the threaded holes for the oil pump go through to the gear area, they are not blind holes.
I have seen some newer cases have blind holes.
So, I guess you have converted it back to original.
Use thread sealant on the nuts to prevent leaks. |
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virusdoc
Samba Member
Joined: August 13, 2018
Posts: 525
Location: Durham, NC, USA
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| Posted: Thu May 13, 2021 5:55 pm Post subject: Re: Oil pump stud penetrates case |
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| busdaddy wrote: |
I hope you take away a lesson from this, if the fastener is putting up that much of a fight it may be time to find out why before cramming it in.
As already mentioned it's not likely to leak so carry on. |
It was putting up that much fight from the first few threads. I probably needed to retap it to clean up the threads--that is what I learned.
_________________
1976 Convertible Super Beetle, "June Bug".
FI-->34PICT3 carb conversion-->now dual 40 IDFs
Self-rebuilt 1904 (after totally botching a 1641 rebuild, cussing a lot, and throwing lots of cash in the fire) |
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Starbucket
Samba Member
Joined: April 30, 2007
Posts: 4025
Location: WA
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| Posted: Thu May 13, 2021 6:27 pm Post subject: Re: Oil pump stud penetrates case |
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| If you put on some gloves and hold the stud (end going in case) against a piece of dry ice for 1 min. it will screw right in. |
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virusdoc
Samba Member
Joined: August 13, 2018
Posts: 525
Location: Durham, NC, USA
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| Posted: Thu May 13, 2021 6:53 pm Post subject: Re: Oil pump stud penetrates case |
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| Starbucket wrote: |
| If you put on some gloves and hold the stud (end going in case) against a piece of dry ice for 1 min. it will screw right in. |
That’s a neat trick. Could probably accomplish the same thing by tossing the studs in the freezer for a bit. Since most of us probably don’t keep dry ice on hand.
_________________
1976 Convertible Super Beetle, "June Bug".
FI-->34PICT3 carb conversion-->now dual 40 IDFs
Self-rebuilt 1904 (after totally botching a 1641 rebuild, cussing a lot, and throwing lots of cash in the fire) |
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Starbucket
Samba Member
Joined: April 30, 2007
Posts: 4025
Location: WA
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| Posted: Fri May 14, 2021 6:27 am Post subject: Re: Oil pump stud penetrates case |
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| virusdoc wrote: |
| Starbucket wrote: |
| If you put on some gloves and hold the stud (end going in case) against a piece of dry ice for 1 min. it will screw right in. |
That’s a neat trick. Could probably accomplish the same thing by tossing the studs in the freezer for a bit. Since most of us probably don’t keep dry ice on hand.
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Walmart or any large market carries if for around $1.00 a pound. |
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