SUB-EGR Valve Service

Remove the Sub-EGR valve from the carburetor and clean as described below.

1. Push the Sub-EGR valve pin in the direction shown in Figure 20 until it stops. Raise the lever to disengage it from the pin.

2. Remove the valve from the carburetor.

Note:
If the Sub-EGR valve will not come out of the carburetor, remove the snap ring from the Sub-EGR valve pin (Figure 21). Then carefully remove the pin and the link, taking care not to lose the spring and steel ball from the valve. Insert a small phillips screwdriver in the pin hole for use as a handle. Loosen the carbon deposits by spraying carburetor cleaner into the Sub-EGR Valve passages. Then, remove the valve from the carburetor.





3. Wet a piece of fine crocus cloth and cup it in the palm of your hand. Clean the valve by twisting it in the crocus cloth (Figure 22)...

...or, if no crocus cloth is available, use the round brass brush and carburetor cleaner (Figure 23).

CAUTION:
Do not clean the valve with a steel wire brush as it may scratch the valve. Scratches will allow carbon to build up on the valve quickly.





4. Clean the plunger hole in the carburetor with carburetor cleaner. Insert a round brass brush into the Sub-EGR valve bore and clean the plunger hole (Figure 24). Use the round brass brush to clean the underside valve passages.

CAUTION:
Do not use a screwdriver or a steel bristle wire brush in the bore of the Sub-EGR valve since this will scratch and cause carbon to build up on the valve quickly.





5. Dry the valve and plunger hole thoroughly. If removed, install the spring, steel ball, pin and snap ring. Re-install the Sub-EGR valve in the carburetor (Figure 25). Connect the valve linkage to the pin.