Re: [AMC-list] it runs...

[tom jennings <tomj@xxxxxxx>]

The other springs aren't "failed", just wrong parts. If (if!) the plumbing
between the pump and the main galler/relief is open enough (low resistance)
then the pressure right outside the pump won't be much higher (few psi) than
in the gallery. Same as the hose outside your house; when the hose ends is
open, the pressure is the same at both ends (more or less). If you close the
delivery end pressure skyrockets.

The spring fiasco was a side show.

The "IF" part above is an assumption, possibly wrong. I'm gonna do two
things: replace all the 90 degree fittings with straights, and MEASURE the
pressure at the pump outlet and on the gallery. If it's much higher out of
the pump than at the gallery, there is more restriction in there than I
thought. If so, I'll know what to fix.

We know that the pump does not put out more volume at pressure than the
relief valve can dump, that's fact write large in cast iron. Though, I did
improve the pump! I got clearances down to .002" or less, stock is about
.008", with new gears, a hand-picked housing and very careful assembly.
Typical old 50's high tolerance stuff made tight. As my friend Nate says,
"no good deed goes unpunished".

I'm confident I can work this out and it won't be complicated, just careful,
and it will be repeatable. I'm likely gonna get crimped stainless braid
hoses made once I get this untangled.

One positive thing is, I basically pressure tested the rest of my system
higher than it will ever operate, I bet close to 200 psi. The bourdon tube
in the first gauge blimped up like crazy!




On Tue, May 4, 2010 at 5:40 PM, Frank Swygert <farna@xxxxxxx> wrote:

> I just think the internal pump pressure is much higher than it is in the
> main gallery. It has to be some, but I wouldn't think it was that much over
> 100 psi. There's no way all three springs and plungers from 196 engines
> could have failed. I agree with your logic, the pump pressure shouldn't be
> more than the relief, but apparently it is. You're getting pressure to the
> oil filter straight off the pump, not off the gallery.
> -----------------------------
>
>
> From: tom jennings <tomj@xxxxxxx>
>
> I got my new 195.6 OHV running, but not without problems.
>
> I replaced the oil pressure relief spring with a shorter/softer one,
> refilled etc, and within 5 seconds puked oil out the same place (pushed out
> the oil filter gasket). Then I tried the "other" plunger. Same thing. Then
> I
> put in the shortest, softest spring, and ... it held.
>
> --
> Frank Swygert
> Publisher, "American Motors Cars" Magazine (AMC)
> For all AMC enthusiasts
> http://www.amc-mag.com
> (free download available!)
>
>
> _______________________________________________
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>
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