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David, Hank...thank you for help and advice. Hank you were just about on the
money.
You'll recall that my OD was slipping in & out at low revs? Of course you
do.
I bought a gauge from ODSpares, excellent people/very helpful. (In
retrospect, I wonder how I've managed for so long without one).
Pressure showed as well into the 470 to 490 range whilst OD was engaged at
+/- 1,500 rpm in 4th. Which is GOOD.
But, pressure dropped to zero immediately upon disengaging and switching
off. Which is BAD.
The little hole in the so-called "Valve operating" was/is clear.
I phoned Dave Twigger at ODSpares who said that there was debris under the
ball on the seat there OR, if it was clear, then the ball needed reseating.
So, I gave the ball a few brisk taps and the pressure drop did slow a little
up on the next gauge test.
I gave it some more taps and it improved somewhat again. Now takes about 30
seconds to get down to, say, 20psi and then loses pressure quite slowly.
So:-
1. How hard can one "Tap" the ball? Not the easiest question to answer,
I do appreciate that. One man's tap is another man's wallop?
I suspect I'll have to repeat the process..
2. What time duration is acceptable in operating terms for the pressure
drop? What am I aiming at?
Thanks, Simon
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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>David, Hank…..thank you for help and advice. =
Hank you were just about on the money.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>You’ll =
recall that my OD was slipping in & out at low revs? Of course you =
do.<o:p></o:p></p><p class=3DMsoNormal>I bought a gauge from ODSpares, =
excellent people/very helpful. (In retrospect, I wonder how I’ve =
managed for so long without one).<o:p></o:p></p><p =
class=3DMsoNormal>Pressure showed as well into the 470 to 490 range =
whilst OD was engaged at +/- 1,500 rpm in 4<sup>th</sup>. Which is =
GOOD.<o:p></o:p></p><p class=3DMsoNormal>But, pressure dropped to zero =
immediately upon disengaging and switching off. Which is =
BAD.<o:p></o:p></p><p class=3DMsoNormal>The little hole in the so-called =
“Valve operating” was/is clear.<o:p></o:p></p><p =
class=3DMsoNormal>I phoned Dave Twigger at ODSpares who said that there =
was debris under the ball on the seat there OR, if it was clear, then =
the ball needed reseating.<o:p></o:p></p><p class=3DMsoNormal>So, I gave =
the ball a few brisk taps and the pressure drop did slow a little up on =
the next gauge test.<o:p></o:p></p><p class=3DMsoNormal>I gave it some =
more taps and it improved somewhat again. Now takes about 30 seconds to =
get down to, say, 20psi and then loses pressure quite =
slowly.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>So:-<o:p></o:p></p><ol style=3D'margin-top:0cm' =
start=3D1 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo1'>How hard can one =
“Tap” the ball? Not the easiest question to answer, I do =
appreciate that. One man’s tap is another man’s =
wallop?<o:p></o:p></li></ol><p class=3DMsoListParagraph>I suspect =
I’ll have to repeat the process……<o:p></o:p></p><ol =
style=3D'margin-top:0cm' start=3D2 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo1'>What time duration is =
acceptable in operating terms for the pressure drop? What am I aiming =
at?<o:p></o:p></li></ol><p class=3DMsoNormal =
style=3D'margin-left:18.0pt'><o:p> </o:p></p><p class=3DMsoNormal =
style=3D'margin-left:18.0pt'>Thanks, =
Simon<o:p></o:p></p></div></body></html>
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