Steel Soldiers::Military Vehicles Supersite - View Single Post

wesk · 05-28-2009, 02:47

Quote:

I'm reparing a carter ys carb.
But there's no exploded view of the carb, so i'm not sure how al the parts are ment to go in.
Does anybody have an exploded view or something like it for me?

Greetings from Holland.

See illustration above.

The YS637S used on the M38 is covered in the TM 9-1826A dated Dec 1952. A word of caution if you use this manual the illustration of the entire carb (blow-up) has one of the diaphram springs on the wrong side of the diaphram. We have a copy of this manual loaded on our web site www.willysmjeeps.com

If you are rebuilding a YS950S used on the M38A1 and M170 the same manual will work but you will need the specs below:

Quote:

Carter YS950S Carbureter Specifications

For Willys 4 Cylinder Engine: 3 1/8 Inch Bore, 4 3/8 Inch Stroke

Dimensions:
Flange size, ------------------------------------------------------------------ 1 1/4 inch S. A. E.
Primary venturi, ------------------------------------------------------------ 11/32 inch I. D.
Secondary venturi, ---------------------------------------------------------- 19/32 inch I. D.
Main venturi, ----------------------------------------------------------------- 1 1/4 inch I. D.

Float Setting:
Distance from seam of float to float chamber
over, with weight of float on needle and spring: ------------------------ 9/64 inch.

Vents:
Balanced thru air horn to air cleaner via tubing external to carbureter.
Vent: Bowl chamber to carbureter bore, size ----------------------------- No. 68 (.031 inch) drill.

Gasoline Intake:
Square vertical (spring loaded) needle ------------------------------------- No.53 (.0595 inch) drill size in needle seat.
Bleeder tube, assembled over idle tube, with 2 side holes--------------- No. 65 (.035 inch) drill.

Low Speed Jet Tube:
Jet size, ------------------------------------------------------------------------- No. 70 (.028 inch) drill (in end
of tube).
Auxiliary jet (on side of tube) size: ---------------------------------------- No. 75 (.021inch) drill.
By-pass (in air horn) size: --------------------------------------------------- No. 52 (.0635 inch) drill.
Economizer (in body) size: No. 54 (.055 inch) drill.

Idle Port:
Upper port: slot type, length, ------------------------- ---------------------- .165 inch.
Width, -------------------------------------------------------------------------- .030 inch.

Idle Port Opening:
Top of port--------------------------------------------------------------------- 125 to .129 inch above top edge of valve with valve tightly closed.

Lower Port (For Idle Adjustment Screw): Size, -------------------------- .053 to .057 inch diameter.

Set Idle Adjustment Screw: -------------------------------------------------- 1/2 to 1 1/2 turns open. For richer
mixture, turn screw out.
Idle engine at ------------------------------------------------------------------- 700 R.P.M. with deep fording vents open.

Main Nozzle:
In primary venturi, ------------------------------------------------------------ angle 20°.
Discharge jet size, ------------------------------------------------------------- .0935 inch inside diameter.
Main nozzle bleed (tube in air horn) ---------------------------------------- Size: No. 70 drill.

Metering Rod (Diaphragm operated):
Economy step, ----------------------------------------------------------------- .070 inch.
Power Step .-------------------------------------------------------------------- 054 inch diameter.
Vacuum passage restriction, size: ------------------------------------------ No. 50 (.070 inch) drill
Vacuum passage bleed to bore, size: -------------------------------------- No. 65 (.035 inch) drill.
Metering Rod Jet: Size: .----------------------------------------------------- 096 inch diameter.

Accelerating Pump: Diaphragm type, vacuum operated.
Discharge jet size, ------------------------------------------------------------ No. 72 drill.
Intake ball check size: ------------------------------------------------------- No. 40 drill.
Discharge ball check under needle, size ---------------------------------- No. 50 drill.
Vacuum passage restriction, in flange size: ------------------------------ No. 52 (.0635 inch) drill.
Vacuum passage air bleed to bore, size: ---------------------------------- No. 62 (.038 inch) drill.

Pump Stroke: ----------------------------------------------------------------- No adjustment.

Choke: Manual--Offset, butterfly type with poppet valv

Vacuum Spark Port: --------------------------------------------------------- None.

Specifications copied from a one page bulletin from Carter Carburetor Form 4960B released March 1953, revised March 1956.