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[Fot] Type A OD pressure test

Subject: [Fot] Type A OD pressure test
From: cartravel at pobox.com (Larry Young)
Date: Wed, 7 Mar 2018 14:41:47 -0600
References: <7DF32ACB-8C68-45A3-9654-C743E3FB3C1A@icloud.com> <1967427720.8517669.1520273071794@mail.yahoo.com> <Jc5y1x00P17ru6w01c5zXm>
It seems like the balls and springs (pump, operating valve) are always a 
problem. I've seen all sorts of suggestions and tried many of them. 
Lapping the ball seat sounds like a good idea. I've always used the 
smack the ball with a hammer trick. I don't know how to test those 
little springs and I don't trust that the ones we buy are correct. 
Rather than worrying about air leakage, a better test is probably to see 
how long the unit holds pressure after you shut it down. I had one that 
would hold pressure for days, but most will only hold pressure for a 
number of minutes to perhaps an hour.

One problem I have frequently had is that the unit will not pressure up 
after I put oil in it.? I've always thought it was because of all the 
air in the lines. I developed an assembly method to make sure I got oil 
pumped at each step. You could also use it as a troubleshooting method. 
You might check it out starting at Step 15 in 
http://vintagetriumphregister.org/maintain/TransRebuild/OverDriveA02.pdf. 
Another trick I've heard is to put Vaseline jelly in the pump to help it 
get started.
 ?- Larry



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