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Re: [OM] Oily 300/4.5. Suggestions?

Subject: Re: [OM] Oily 300/4.5. Suggestions?
From: John Hermanson <omtech1@xxxxxxxxxxx>
Date: Fri, 29 May 2009 08:30:28 -0400
I should have added that the front group MAY unscrew without any 
problems.  If so, then all that remains is the disassembly of the 
diaphragm plate, thorough degreasing and rebuild.
___________________________________
John Hermanson  |   CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121  |  www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html


John Hermanson wrote:
> Remove front lens assembly, remove mount.  There are (I think) 4 screws 
> accessible from the back that hold the diaphragm assembly plate in. 
>  From the front, diaphragm cam, and some springs and levers may have to 
> come out first.  The hardest part MAY be simply unscrewing the from 
> group.  No set screws, just that many appear to be glued in.  Even in 
> the 80s, I watched Japanese techs (with 300/4.5 in a full size vice) 
> with giant spanners trying to unscrew the front tube.  It never budged 
> even after liquid wrench, alcohol, acetone, every solvent under the sun 
> was applied.  Spanner eventually broke.  Not really a do it at home job.
> ___________________________________
> John Hermanson  |   CPS, Inc.
> 21 South Ln., Huntington NY 11743
> 631-424-2121  |  www.zuiko.com
> Olympus OM Service since 1977
> Gallery: www.zuiko.com/album/index.html
> 
> 
> Chuck Norcutt wrote:
>> Anyone have suggestions for disassembly of the 300/4.5 to clean up an 
>> oily diaphragm?  Someone I know (not on this list) has one and asked if 
>> I had any tips for cleaning it.  I gave him the parts list and exploded 
>> assembly diagram and an old note from Clint that says the whole 
>> diaphragm cage is to be removed as an assembly.  But Clint's note didn't 
>> say anything about the best way to get in.
>>
>> Chuck Norcutt
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