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May 31st, 2017, 12:37 PM   #1
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Oil pressure relief spring?

This has been puzzling me since my engine strip.
The stretched out spring is the one I removed from the JBS 660.
Any idea why someone would do this?
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May 31st, 2017, 03:23 PM   #2
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Don't know but someone may have wanted more pressure on it ? Thinking it would help.
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May 31st, 2017, 04:03 PM   #3
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Yes it will increase oil pressure but by not much at all

I did a thread on oil pump upgrade with. More details
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May 31st, 2017, 06:16 PM   #4
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Originally Posted by bushmechanic View Post
Yes it will increase oil pressure but by not much at all

I did a thread on oil pump upgrade with. More details
I stydied your oil pump thread and want to increase my pressure too. What spring pressure and oil pressure did you end up in the end? Your first upgraded spring didn't give you oil pressure that you wanted. I have 3 progressively stronger springs just waiting.
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May 31st, 2017, 07:29 PM   #5
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It's stil the same Spring but I will increase it 20% next time I open the engine it's the old cases so requires case split.

It's also the old head which has oil feed to everything And I added a lot of oil flow to the main Bearing on the lhs so you probably don't need as strong a spring as me.

I'm Travelling at the moment so don't have good internet
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May 31st, 2017, 08:38 PM   #6
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Originally Posted by bushmechanic View Post
Yes it will increase oil pressure but by not much at all

I did a thread on oil pump upgrade with. More details
Cheers Bush, it looked like a bodge to me so I fitted a standard spring. Can't imagine it's a JBS upgrade!!
Do you think it did actually increase oil pressure!?!?
Yes, I read your thread on the pump upgrade, interesting stuff!!
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June 1st, 2017, 12:42 AM   #7
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Yes it increases oil pressure
From almost nothing to a bit more lol
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June 2nd, 2017, 02:32 AM   #8
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This pump is some kind of upgrade?
The peg locating hole in the shaft is nearly flush with the cap. To locate the pump gear the previous builder has ground off part of the cog face.
The pump cap is located with Allen heads, well and truly rounded off, no idea how I'm going to undo them! Probably cut a slot!
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Oil pressure relief spring?-20170602_105119.jpg   Oil pressure relief spring?-20170602_104524.jpg  
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June 2nd, 2017, 04:01 AM   #9
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interesting pics

try a bit bigger than normal Torx bit or some vise grips

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June 2nd, 2017, 06:32 AM   #10
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Ha ha Mole grips!
Tapped a Torx on, job's a good 'un!

Spindle shaft 35.20mm
Spindle 'star' 14.20mm
Brass 'thing' 13.70mm
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Oil pressure relief spring?-20170602_142711.jpg   Oil pressure relief spring?-20170602_141120.jpg   Oil pressure relief spring?-20170602_140655.jpg  
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