Can the diaphragm assembly be accessed from the back alone? I've heard
back from the original questioner who said he could see no evidence of
glue on the name ring. However, he built a special friction tool with
dense foam glued to a shaped backing plate to remove the name ring. The
foam ripped off the backing plate when he tried to unscrew the ring.
Chuck Norcutt
John Hermanson wrote:
> 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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