Specifications

ManualsBrandsWisconsin ManualsAutomotiveVH4D

Adjust the idle adjusting needle to obtain smooth idling of

the engine at idling speed. Turn the needle out (counter-

clockwise) to make the mixture richer, and in (clockwise)

to make it leaner.

CHOKE PLATE VENTURI

(CLOSED POSITION)

THROTTLE

PLATE

PARTIALLY

CLOSED

POSITION)

INSPECTION OF PARTS

1. Float Assembly -- Replace if loaded with gasoline, da-

maged or if float axle bearing is worn excessively. In-

spect float lever for wear at point of contact with fuel

valve needle. Replace if wear is excessive.

2. Float Axle -- Replace if any wear has occurred on the

bearing surface.

3. Fuel Valve (Needle & Seat) Assembly -- Replace as

complete unit. Wear of any of these parts can seriously

affect the operation of the float.

4. Idle Adjusting Needle- Inspect tapered end of the

needle to make sure it is smooth and free of grooves.

Replace if pitted or grooved.

5. Gaskets, Seal and Retainer -- Replace all gaskets,

throttle shaft seal and retainer each time the carburetor

is overhauled.

6. Check Specifications. Verify the correctness of the

following parts. Numbers will be found on the parts.

Main Jet, Idling Jet and Fuel Valve.

Fig. 4 CHOKE SYSTEM

SERVICE AND REPAIR PROCEDURE

IDENTIFY CARUBRETOR

Check the numbe~ on the metal idgmification disc pirm~d to th~ top of

the tRrottlc body or indented in iL Tim plain nurnbc~ is the Zenith

assembly number, the numb~ with the lc[~cr "L" p~-fixcd to it is Wis-

Con Total Powcr’s part numbcx for the complem assembly.

EXPLODED VIEW (Page 3)

The exploded view identifies the serviceable component

parts of the carburetor and shows their relationship to the

complete assembly. Use the key numbers on the exploded

view to identify and locate parts when performing both the

disassembly and assembly operations.

DISASSEMBLY

SEPARATE CARBURETOR BODIES

Remove the three bowl assembly screws (45,

46) and

separate fuel bowl (39) from throttle body (26).

DISASSEMBLE FUEL BOWL

Remove the main jet plug (43) and fibre washer (42),

using a 9/16" open end wrench.

2. Remove the main jet (41) and fibre washer (40), using

Zenith Tool No. C161-83 main jet wrench.

3. Remove the Idle Jet (38), using a small screwdriver.

Remove the bowl drain plug (44).

DISASSEMBLE THROTTLE BODY

I. Remove the float axle (35) by pressing against the end

with the blade of a screwdriver.

2. Remove the float (36).

3. Remove the fuel valve needle (31), using the fingers.

4. Remove the fuel bowl to throttle body gasket (37).

5. Remove the main discharge jet (32), using a small

screwdriver.

6. Remove the fuel valve seat (31) and fibre washer (30),

using Zenith Tool No. C161-85.

7. Remove the idle adjusting needle (17) and spring (18).

CLEANING

Thoroughly clean all metal parts in Bendix Metalclene or

Speedclene and rinse incleaning solvent. Blow out all pas-

sages in throttle body and fuel bowl with reduced air pres-

sure. Be sure all carbon deposits have been removed from

throttle bore and idle discharge holes. Reverse the flow of

compressed air through all passages to insure the removal

of all dirt. NEVER USE A DRILL OR WIRE TO CLEAN

OUT JETS OR IDLE HOLES.

REASSEMBLY

ASSEMBLY OF THROTTLE BODY

1. Install the fuel valve seat (31) and fibre washer (30),

using Zenith Tool No. C161-85.

Install the main discharge jet (32), using a small screw-

driver.

Install fuel valve needle in seat (31), followed by float

(36) and float axle (35). NOTE: Insert tapered end

float axle (35) into float bracket on side opposite slot

and push through the other side. Press float axle (35)

into slotted side until the axle is centered in bracket.

4. FLOAT SETTING

a. Fuel Level, Check position of float assembly (36),

for correct measurement to obtain proper fuel level by

using a depth gage. NOTE: Do not bend, twist, or

apply pcessure on the float body.

b. With bowl cover assembly (26)in an inverted position,

viewed from free end of float (36), the float body must

be centered and at right angles to the machined sur-

face. The float setting is measured from the machined

surface (no g~sket) of float bowl cover to top side

float body at highest point. This measurement should

be 31/32% plus or minus 1/32".

c. Bending Float Lever. To increase or decrease dis-

tance between float body (36)and machined surface

(26) use long nosed pliers and bend lever close to

float body. NOTE: Replace with new float if position

is off more than 1/16".

Install throttle body to fuel bowl assembly gasket (37)

on machined surface of throttle body (26).

6. Install idle adjusting needle (17) and spring (18). Screw

needle IN (clockwise) until it seats lightly against the

idle discharge hole, then back it out 1~/2 turns as a pre-

liminary idle adjustment.

REASSEMBLE FUEL BOWL

I. Install the main jet (41) and fibre washer (40), using

Zenith Tool No. C161-83 main jet wrench.

2. Install the main jet hex plug (43) and fibre washer

(42), using a 9/16" open end wrench.

Install the idle jet (38), using a small screwdriver.

4. Install the bowl drain plug (44).

REASSEMBLE CARBURETOR BODIES

Install the three bowl assembly screws (45, 46) through

the fuel bowl and into the throttle body

and draw down

firmly and evenly.

SPECIAL TOOLS

The special tools recommended are:

1. C161-83 Main Jet Wrench.

2. C161-85 Fuel Valve Seat Wrench.