Subject: CO Adjusting Procedure            Models: 911, 924, 924 Turbo ALL

Bulletin Number: 80 – 03

To prevent “tampering” with CO adjustment, CO adjusting access hole is plugged. To adjust CO proceed as follows:

Porsche 911 SC

CO, adjusting                                                                                    

• Remove mixture control unit
• Remove fuel distributor from mixture control unit
• Center-punch plug in CO adjusting access hole
• Drill 2 mm (5/64 in.) hole in center of a plug to a depth of approx. 3.5 mm (9/64 in.)

• Remove plug using a suitable screw extractor
• Reinstall fuel distributor on mixture control unit
• Reinstall mixture control unit
• Adjust CO
• Install new break-away screw (Part No. 930.110.647.00) in CO adjusting access hole and tighten until screw breaks, leaving hole plugged

CO, adjusting

• Remove mixture control unit
• Using 2 mm (5/64 in.) drift from lower side of mixture control unit, drive out ball which is used to plug CO adjusting access hole
• Reinstall mixture control unit
• Check and adjust CO to specifications
• Drive “anti-tampering” ball (Part No. 900.108.041.00) to CO adjusting access hole using drift until it “bottoms” in hole.

Porsche 924 and 924 Turbo

CO, adjusting

• Remove mixture control unit
• Using 2 mm (5/64 in.) drift from lower side of mixture control unit, drive out ball which is used to plug CO adjusting access hole
• Reinstall mixture control unit
• Check and adjust CO to specifications
• Drive “anti-tampering” ball (Part No. 900.108.041.00) to CO adjusting access hole using drift until it “bottoms” in hole.

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