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  #61  
Old 9th November 2018
John Harper John Harper is offline
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Quote:
Originally Posted by Hippysmack View Post
WOW!
Now I really want to see a pic of it.
sheez....
It's as mysterious as the "oil pressure relief" valve rumored to exist inside my 1991 engine. Near "unicorn" status.

John
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  #62  
Old 9th November 2018
Four Speed Four Speed is offline
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Good call John. I bet that would be hugely less expensive than via Boon.
Plus, I do wonder about buying elastomer components that are almost 25 years old.
Someone needs to post pictures and dimensions of one of these 26856-82 critters
when they have a chance.
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  #63  
Old 9th November 2018
Four Speed Four Speed is offline
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Hippysmack, I wish I could post pictures on this site! Rest assured, my precious pinion gear is in a secure place!
Boon did have some but I have been unable to find out what the colour coding meant for 88-90. I eventually found
a NOS pinion that matched my engine.

John, the MK1 Evos had a relief valve built into the oil filter housing. You can see a large nut under the filter housing
behind the oil pressure switch - it dumps excess oil pressure into the cam chest. It is much like the BT relief valve in
that it uses a plunger and spring. It is designed to limit wear on the pump, drive etc. It was deleted later as part of HDs
improvement programme (to save money). Duker had issues with it blowing too easily which is not good, so he installed
a much stronger spring. While Tore et al pressure tested theirs then rerouted the oil blow off to the oil tank to make life easier
for oil scavenging. It makes sense to at least replace the 30 year old spring and inspect the plunger for wear.
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  #64  
Old 9th November 2018
John Harper John Harper is offline
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Quote:
Originally Posted by Four Speed View Post

John, the MK1 Evos had a relief valve built into the oil filter housing. You can see a large nut under the filter housing
behind the oil pressure switch - it dumps excess oil pressure into the cam chest.
Yes, I was referring to my 1991, which may have one as well. Never been able to confirm. I think it's only observable if the cam cover is off, which I've never done. It's positioned horizontally (parallel to filter axis) rather than vertically as on the 86-90 models.

John
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  #65  
Old 9th November 2018
Four Speed Four Speed is offline
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Well you learn something new everyday! Does it show up in the 1991 parts list?
And, if HD fitted one, when did they retool to eliminate it?
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  #66  
Old 9th November 2018
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Yes, it's internal on a 91.

91 FSM:
High pressure oil, when cold, in the filter cavity, opens the pressure regulator. Oil flows into the gearcase then returns to the tank.

I haven't found it in the parts book yet though.


It shows a diagram of the path in figure 3-43
I can't scan it at the moment.
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Last edited by Hippysmack; 9th November 2018 at 15:40..
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  #67  
Old 9th November 2018
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does anyone have the dimensions of the 26856-89 valve or the "A" identifier one?
i have the dimensions on the -82 version.
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  #68  
Old 9th November 2018
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Quote:
Originally Posted by bustert View Post
does anyone have the dimensions of the 26856-89 valve or the "A" identifier one?
i have the dimensions on the -82 version.
Not yet, but I have one coming. I'm going to photograph both the 82 and 89 and submit dimensions when the 89 gets here.
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  #69  
Old 9th November 2018
Four Speed Four Speed is offline
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Quote:
i have the dimensions on the -82 version.
Well done Bustert!
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  #70  
Old 9th November 2018
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haven't seen it either, maybe hd considers it a non serviceable part.
the 86>90 shows it in the fsm and part of the removable adapter and the 91>03 shows it behind the spring/check ball and filter threaded adapter part of the right case. just by looks, appears to be the same, but i would not trust the hd graphics.
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