Results 16 to 26 of 26
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28th Jun 2021, 11:42 PM #16Most Valued Member
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That plastic “wiper” could be a backup ring. Is the crack actually a crack or is it possibly a scarfed join to allow you to fit it into the groove.
Steve
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29th Jun 2021, 09:13 AM #17Member: Blue and white apron brigade
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- Perth
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29th Jun 2021, 11:52 AM #18Most Valued Member
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- Nov 2017
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- Geelong, Australia
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Hard to tell from the photo, but the backup rings I've dealt with in the past (aviation) were Teflon. They were typically scarfed so they could be spread over a shaft and placed in the groove and the ends would overlap when in position. Some were thinner and did almost 2 turns so there was a continuous contact - looked a bit like a double turn spring washer.
The idea is they are used on the opposite side of the o-ring to where the main pressure is applied to prevent the o-ring extruding down between the shaft/piston and bore.
Steve
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29th Jun 2021, 12:12 PM #19Member: Blue and white apron brigade
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29th Jun 2021, 08:42 PM #20Member: Blue and white apron brigade
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Got a quote from CBC,
Price of O-ring is $23.40, minimum order is 10 pieces, has to come from US Freight is $50 pls GTS $316
For $100 I can buy a whole brand new pump.
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29th Jun 2021, 09:18 PM #21Most Valued Member
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- Nov 2008
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- North Brisbane. Qld. Australia
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- 70
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29th Jun 2021, 09:50 PM #22Member: Blue and white apron brigade
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- Perth
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1st Jul 2021, 07:47 PM #23Member: Blue and white apron brigade
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- Perth
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Here's my attempt at turning the teflon wiper for the press pump.
Had bugger all length of teflon rod of the right diameter to play with.
Required dimensions of the wiper were 12.7 ID, 17.3 OD and 1.25 mm thick,
Here it is turned down to OD and bored out to ID using a milling flute.
Wiper3.JPG
Standard parting tools too thick so resorted to the old hacksaw blade trick.
Needed 1.25,m thick but was worried the teflon might move so cut it overside and it came out at 1.42mm but this hard teflon (PTFE) sands really vice so I was able to drill an 18mm diam x 1mm deep flat bottom hole hole in a piece of wood using a Forstner bit and inserted the wiper into the hole and rubbed it back and forth on some 180 grit paper.
I even left that tiny little lip on the ID to act as an extra wiper.
Wiper3a.JPG
It was a bit tricky getting it and the O-ring into the internal ring groove but the teflon had enough flex to get in there without breaking.
Wiper3c.JPG
Press works - no drips - all good.
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2nd Jul 2021, 01:38 AM #24China
- Join Date
- Dec 2005
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- South Australia
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- 1,658
Great stuff, amazing what we can do if we have to, I really enjoy this type of repair
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7th Jul 2021, 06:00 PM #25Member: Blue and white apron brigade
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- Feb 2006
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- Perth
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A week later and can report not a single drop of hydro has been lost from the pump repair.
Now I have to tackle the slave/ram which oozes a few drops a week if I leave it below a certain position.
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9th Jul 2021, 11:21 AM #26China
- Join Date
- Dec 2005
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- South Australia
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- 1,658
You will put CBC out of business at this rate (Ha Ha)
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