Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 1 of 1
-
19th August 2019, 07:40 PM #1Most Valued Member
- Join Date
- Aug 2015
- Posts
- 4,432
How to polish recessed O-ring seats in cast iron?
My old Ford 4100 tractor has a diverter valve on the top cover for loader hydraulics, the hydraulic power for the 3-point linkage passes through the interface between the valve and the top cover. When I have a heavy-ish implement on the 3-point linkage, hydraulic oil leaks out from between the valve and the cover. All the O-rings were renewed about a year ago when I did a heap of work on the tractor, fixed all the other oil leaks but this one persists. The two mounting surfaces were a long way from flat, so I've used the surface grinder to make them flatter than a dunnyman's hat, now I need to clean up the surfaces in the bottom of the O-ring recesses to give the new O-rings a fair chance of sealing.
diverter valve surface with bad seats.jpg
There are 9 recesses in 6 different sizes. The valve body is cast iron. My plan is to turn a piece of stock to match each recess diameter, mount the valve in the mill and use some lapping paste on the face / end of the round tools to polish the bottom of each recess with light pressure on the quill. My main question is am I best using steel, aluminium, hardwood, softwood or something else for the polishing tool? A second question would be any other suggestion to make sure these O-rings don't leak again.
And yes the mounting lugs are broken but I have already sorted a method of clamping it down tight so that is not a worry.
Attached Images
- diverter valve surface with bad seats.jpg (194.0 KB)
Read the full thread at metalworkforums.com...
-
19th August 2019 07:40 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Posts
- Many
Similar Threads
-
When does cast iron not machine like cas t iron?
By MWF FEED in forum METALWORK FORUMReplies: 0Last Post: 30th July 2018, 06:10 PM -
Cast iron fireplace - Question for restoring using Penetrol & Liberon Iron Paste
By mookschank in forum METALWORK FORUMReplies: 8Last Post: 19th June 2013, 06:32 PM -
Cast iron VS Cast steel lathe compound slide
By Ueee in forum METALWORK FORUMReplies: 10Last Post: 23rd December 2012, 11:40 PM -
Cast Iron vs Cast Alloy Wheels
By TerryG in forum BANDSAWSReplies: 4Last Post: 25th February 2003, 10:42 PM