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Replacing oil petcocks
Posted: Thu Aug 01, 2019 5:05 am
by Art Cube
Hi,
I got as 1940 H a while back and when I changed the oil the spinners on the petcocks just turned off instead of opening. I see they are available to purchase so that's not an issue.
I took a vise grip to try and turn them out but either it's not supposed to be easy or they look almost welded in. I don't want to break them apart and have a mess as the tractor runs fine and I can still open the top one using a vise grip.
Any advice on changing these out would be great.
Thanks,
Rob
Re: Replacing oil petcocks
Posted: Thu Aug 01, 2019 11:51 am
by Jim Becker
They screw in, pipe thread. The problem installing them is getting the opening pointing down. They may have been overtightened to accomplish that.
Re: Replacing oil petcocks
Posted: Thu Aug 01, 2019 2:49 pm
by Art Cube
Here's a photo. I guess more effort is all that's required.
Re: Replacing oil petcocks
Posted: Thu Aug 01, 2019 7:45 pm
by Scrivet
Looks typical. Someone has over tightened them to shut off, or more likely, tried turning the wrong way to open them (clockwise to open) one to many times and snapped off the "handles". If you're going to replace them put a pipe wrench on them and unscrew the whole thing (counter-clockwise) from the oil pan. When you get the new ones installed, the valve itself doesn't need seated much more than finger tight.
Re: Replacing oil petcocks
Posted: Fri Aug 02, 2019 5:12 am
by Art Cube
Thanks, I hadn't thought of using a pipe wrench.
Re: Replacing oil petcocks
Posted: Fri Aug 02, 2019 5:26 am
by Rick Spivey
As Scrivet said, and I just want to highlight, the petcock portion is reverse threaded, so clockwise to open, ccw to close. No "rightie tightie" on these!
Re: Replacing oil petcocks
Posted: Fri Aug 02, 2019 10:10 am
by Jim Becker
Rick Spivey wrote:As Scrivet said, and I just want to highlight, the petcock portion is reverse threaded, so clockwise to open, ccw to close. No "rightie tightie" on these!
NO NO NO.
That is how the handles get twisted off -- usually somebody turning CCW to try to close it. They are left handed threads but also a back seating valve. You turn it CCW to open and CW to close.
Re: Replacing oil petcocks
Posted: Fri Aug 02, 2019 7:51 pm
by John *.?-!.* cub owner
Jim beat me to it.
Re: Replacing oil petcocks
Posted: Sat Aug 03, 2019 6:16 am
by Rick Spivey
Oops, Sorry Guys, Jim is correct. I remembered that something was "odd" about these compared to a bolt. When I'm turning it CW to close, it is actually backing out of the housing due to the left hand threads and back seating valve. Sorry for my confusion! I had to walk out to the H this morning to get it straight in my head.