Cummins/Onan — BOWL COVER

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

1. If engine is equipped with an automatic choke, remove two screws that fasten the choke to the carburetor and remove assembly. Atways perform carburetor repair under cleanest conditions possible.
2. Remove throttle and choke plate retaining screws, then plates. Pull out throttle and choke shafts, being careful not to damage the tefion coating applied to some throttle shafts.
3. Remove main and idle adjustment screw assem- blies.
4. On downdraft carburetors, remove attaching screws and separate upper and lower carburetor sections. On sidedraft models, unscrew the re- taining screw and remove fuel bowl from the upper carburetor body. 24
5. Carefully note position of float assembly parts, then slide out retaining pin and remove the float assembly, and springs or clips, and the needie valve.
6. Unscrew and remove needle valve seat. Cleaning and Repair Carburetor maintenance shouid consist of regular cleaning. Some gasolines have a tendency toward formation of gum deposits inside the carburetor.
7. Soak all metal components not replaced in car- buretor cleaner. De not soak non-metal floats or other non-metal parts. Followthe cleaning manu- facturer's recommendations.
8. Clean all carbon from the carburetor bore, esp- cially where the throttfe and choke plates seat. Be careful not to plug the idle or main fuel ports.
9. Dry out ali passages with low pressure air (35 PSI). Avoid using wire or other objects for clean- ing that may increase thesize of critical passages.
10. Check the condition of adjustment needle; re- place if damaged. Replace float if loaded with fuel or damaged.
11. Gheck the choke and throttle shafts for excessive play in their bore and replace if necessary.
12. Replace old components with new parts. Carburetor repair and gasket kits are available from your nearest Onan Pasts Center. Carburetor Assembly (Gasoline and Gas-Gasoline Only)
13. Install throttle shaft and plate, using new screws and jockwashers. Install with bevel mated to the carburetor body. On plates marked with the letter C, install with the mark on the side toward the idle port when viewed from the flange end of the car- buretor. To center plate, back off stop screw, close throttle lever and seat plate by tapping it with a small screwdriver. Then tighten the two screws.
14. Install choke shaft and plate. Center plate insame Sys INT Tro MM) biden tacit manner as the throttle plate (Step 1). Use new FLOAT OR 1/4 INCH (6.3 MM) WITH screws and fockwashers. STYROFOAM (PLASTIC) FLOAT. 3, Install fuel inlet valve seat and valve. COKICCKA 4, Install float, float pin and float spring (begin Spec H). Center pin so float bow! does not ride against it, BEND TAB TO ADJUST
15. Check float level with the carburetor casting inverted. See Figure 18
16. install main and idie mixture screw assemblies. Turn in screws until lightly seated and then out the number of turns specified in Table 1. Forcing the mixture adjustment oes screws tight will damage the 17 - 3/16 INCH needie and seat. Turn in only untillight tensions avy (32-48MM) CCKB Begin Spec H felt.
17. Install choke assembly. THIS DIMENSION SHOULD BE 11/64 INCH (4.7 MM} CCKB Prior to Spec H FIGURE 18. CHECKING FLOAT LEVEL 25 THERMAL. MAGNETIC CHOKE (Optional This choke uses a heating element and a heat sensi- tive bimetal spring to open the choke plate. The choke solenoid, actuated during engine cranking only, closes the choke plate according to ambient temperature. During gaseous fuel operation, the choke plate is locked in the full open position by the choke fock wire, Figure 15. If

Source: manual:927-0754 Onan CCK-CCKA-CCKB (Spec A-J) Engine Service Manual (03-1986)L.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.