Itinerant Air-Cooled

Had some oil pressure issues, that flicker of the oil light at idle, so I decided to check out the oil control valve and oil relief valve.

The pistons seem to move smoothly in the barrels.

But how does one test the springs?

Bentley lists the spec as such:

Relief Valve
"Length loaded: 44.1 MM", "Load: -"
"Length loaded: 39 MM", "Load: 15-19 3/4 lbs"

Control Valve
"Length loaded: 20.2 MM", "Load: -"
"Length loaded: 26 MM", "Load: 3 3/4 - 4 3/8 lbs"

It makes it sound as if the spring should be shorter when it's under no load.

I'm confused.

chitwnvw wrote: Relief Valve[/u]
"Length loaded: 39 MM", "Load: 15-19 3/4 lbs"

Control Valve
"Length loaded: 26 MM", "Load: 3 3/4 - 4 3/8 lbs"

It makes it sound as if the spring should be shorter when it's under no load.

I'm confused.

Try reading it like this:
At a X length, the relief/control valve spring should exert X lbs of force.
The table clearly shows length vs pressure.
The relief valve spring is the longer stronger spring.
Colin

My two springs are measuring 59 mm and 30 mm. Can anyone confirm if this is correct? It doesn't seem to match up with what the Bentley says.

chitwnvw wrote:My two springs are measuring 59 mm and 30 mm. Can anyone confirm if this is correct? It doesn't seem to match up with what the Bentley says.

The free length is not important. You press them to specified length and measure the force exerted at that length.
Colin

3.5lbs at 26mm for the little guy.

16lbs. at 39mm for the big one.

Here's my testing methodology.

[albumimg]694[/albumimg]

The blank displays give away that this is a photo op, when I did it for real, I simply pushed down on the top jaw of the caliper until it read the correct mm and then looked at the scale to see what it read.

Thus, you are good to go. . . welcome.
Colin