[SEL] springs

[Arnie Fero]

Hi James,

If you had to compromise on spring OD or ID or solid height, what are your
hard constraints with this application?  Do the springs need to fit over a
rod of a certain diameter, or into a hole of a certain diameter?  Is there
a moving part that would be damaged if the spring went solid; if so what
is that minimum dimension?  For the second spring, a spring company would
not need the wire diameter, they would be able to work with the load /
deflection spec info.

As to posting the scanned drawings, if there's no copyright statement on
them, I don't think anyone would object.

What engine are these springs from again?  Have you contacted service
companies who service engines of this type?  They may know of spring
sources for these springs.  As you have observed, they aren't "standard"
dimensions.

One other place to get a quote would be Reid Supply Company.
www.reidsupply.com and email at: mail at reidsupply.com

Send 'em the scanned spring drawings.  They offer "Custom Made Springs" in
their catalog and don't require any minimum order.

Good luck!!  Be sure to let us know how you make out.

See ya,  Arnie

Arnie Fero
Pittsburgh, PA
fero_ah at city-net.com

On Tue, 6 Dec 2005, James Wiley wrote:

> Arnie suggested I post the specs of the springs to the list - in case someone might have a spring catalog
> or extra springs laying around, so here goes:
>
> 1)  Auxiliary & Injection Pump Plunger Spring FM part number YHA260A7
>      Minimum Inside Diameter                    1"
>      Maximum Outside Diameter                   1 9/32"
>      Free Length                                5 1/4"
>      Minimum Working Length                     3 15/16"
>      Scale per inch                             15# +/- 6%
>      Section                                    Round
>      Ends                                       Closed and Ground
>      Coiled                                     Either hand
>      Finish                                     Plain or Natural
>      Pulsation                                  325 per minute
>      When spring is completely compressed it should measure not more than 2 1/2"
>      20# load at 3 15/16" long
>      39 1/2# load at 2 5/8" long
>      .128" Piano wire, 18 3/4 totals coils
>
> 2)  Injection Pump Suction Valve Push Rod Spring FM Part number YHA628A4
>      Minimum Inside Diameter                    29/32"
>      Maximum Outside Diameter                   1 1/16"
>      Free Length                                5 1/2"
>      Minimum Working Length                     3"
>      Load in Place                              6# +/- 6%
>      Length in Place                            3 3/8"
>      Scale per inch                             2 7/8# +/- 6%
>      Section                                    Round
>      Ends                                       Closed and Ground
>      Coiled                                     Either Hand
>      Finish                                     Natural
>      22 total coils
>
> I just noticed that the wire size for spring 2 is not specified - I don't know if the other information
> is enough to figure that out.  In the drawing, the wire looks to be about half the size of spring 1.
> Both spring drawings have a note that says the springs should be heat treated in Boiling Water for 1 hour.
> I have the drawing scanned and in JPEG form if anyone would like to see them.  I started to post them to
> my web site, but wasn't sure if that would be ok with FM...