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tripicana
Samba Member
Joined: February 13, 2003
Posts: 1164
Location: colorado springs
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 Posted: Fri Feb 05, 2010 12:33 pm Post subject: Case Problem |
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I've been having a problem with my #4 main bearing spinning soon after rebuild. so i took a closer look at the case. i used a boreascope to check out the oil galleys.
i found a plug completely blocking any oil from reaching the #4 bearing. all the plugs on the outside of the case look like they haven't moved since install. are there also plugs internal to the block? did this one shift, blocking the bearing galley? What are my options?
this picture is looking inside the #4 main bearing oil galley.
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Jimmy111
Samba Member
Joined: October 05, 2006
Posts: 2643
Location: Wyoming
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| Posted: Fri Feb 05, 2010 12:44 pm Post subject: |
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That plug should have a step on it. Sometimes it gets filled with particles from a previous bearing failure.
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djkeev
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Joined: September 30, 2007
Posts: 32987
Location: Reading Pennsylvania
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Type 5 Joe
Banned
Joined: January 18, 2003
Posts: 1795
Location: Oregon
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| Posted: Fri Feb 05, 2010 12:55 pm Post subject: |
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I always pull the plugs and tap all oil galleys for pipe plugs, re-machine oil relief valve sealing surfaces.
That is the minimum I do to all my builds before other case modifications are done.
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tripicana
Samba Member
Joined: February 13, 2003
Posts: 1164
Location: colorado springs
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| Posted: Fri Feb 05, 2010 1:03 pm Post subject: |
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that is interesting, thanks for the help. i do believe it is clogged and will need to be removed and cleaned. are these plugs still available?
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Max T.
Samba Member
Joined: September 18, 2009
Posts: 186
Location: So Cal
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| Posted: Fri Feb 05, 2010 3:20 pm Post subject: |
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| How cool, he's got a boreascope. Always wanted one..... |
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Jimmy111
Samba Member
Joined: October 05, 2006
Posts: 2643
Location: Wyoming
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| Posted: Fri Feb 05, 2010 4:37 pm Post subject: |
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| Ive never seen the #4 restrictor plug available. You can pull it out if you are careful and reinsert it after cleaning. |
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1432
Samba Member
Joined: October 08, 2006
Posts: 399
Location: so cal
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| Posted: Fri Feb 05, 2010 5:07 pm Post subject: |
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| With the actual size of the hole in the bearing being restricted down to 2mm in diameter I never saw a reason to reinstall the standard plug. |
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Jimmy111
Samba Member
Joined: October 05, 2006
Posts: 2643
Location: Wyoming
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| Posted: Sat Feb 06, 2010 6:33 am Post subject: |
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That plug limits the amount of oil going to the #4 bearing and acts as a filter to keep the hole in the bearing from becoming plugged.
If you are using a real filter of somesort you can probably not worry too much about the hole becomming clogged but after 10-20,000 miles you will probably start to have oil leak from the pulley. Ive seen it happen many times even to me so I always started reinstalling the plug. |
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fluffhead65
Samba Member
Joined: July 07, 2009
Posts: 6
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| Posted: Wed Mar 17, 2010 8:10 am Post subject: # 4 bearing journal plug? |
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i know that there is a ton of info about the restrictor plug, but I couldn't find a clear answer to my question.
i have a dual relief case apart right now that was tapped for full flow.
Do I have to plug (or do the drilled plug) the hole in the #4 bearing journal if it still has the factory restrictor plug in? |
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nsracing
Samba Member
Joined: November 16, 2003
Posts: 9754
Location: NOVA
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| Posted: Wed Mar 17, 2010 8:16 am Post subject: |
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If you drill out the #4 restrictor, make sure you get it all out. You can drill most of it, but some of it might fall in the hole.
YOu have to remember the turned down area falls off after you hit it w/ the drill.
Make sure you get it all out or you can fry the bearing. |
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