reddiver
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Dacor Olympic 400 Overhaul

Mon Apr 21, 2014 12:42 pm

I am overhauling the first stage of an Olympic 400 . In the schematic, I noticed there is an O Ring before the sintered filter . When I disassembled , it was not present. Is this O ring necessary?
Thanks
Reddiver

swimjim
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Re: Dacor Olympic 400 Overhaul

Mon Apr 21, 2014 12:51 pm

The o-ring forces the tank air to pass through the sintered filter, so it's a good idea for one to be in there.

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Herman
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Re: Dacor Olympic 400 Overhaul

Mon Apr 21, 2014 4:32 pm

All of the orings in the HP stage of the 400/800 are necessary. 33B & G serve to block off the balance chamber from high pressure air. Without them the IP can not be set.
Herman

reddiver
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Re: Dacor Olympic 400 Overhaul

Tue Apr 22, 2014 9:01 pm

for the Oring #33G, what is the trick on getting it back into the recesed hole? It came out easy enough, but I'am baffled on how to squeeze it to get it back into the hole. Is there a special tool ?

on the subject of Orings, is there a resource that gives specifics if you want to replace one? What is the best way to determine correct size?
Thank
Reddiver

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Herman
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Re: Dacor Olympic 400 Overhaul

Tue Apr 22, 2014 10:01 pm

No, they are basically a pain in the rear to get in. All I use is a blunt rod like a wooden Qtip. That particular oring needs to be lubricated, a little more than most do.

Unfortunately not on most regs including this one. As a general rule the higher the differential pressure across the oring the higher durometer it needs to be. 90s (harder) for most high pressure use and 70s (softer) for lower/IP use. I rebuilt a 950 a while back and I used 90 durometer 006s (size number)for that application, odds are the 400 uses the same size. To determine size, a good digital caliper or micrometer and a oring chart are the best ways to determine what an unknown oring is. Most you can tell guess if it's a harder (90) or softer (70) by squeezing it between your fingers....it's best if you have a known durometer one of roughly the same size to compair it with.
Herman

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