International — Adjusting distributor air gap (breakerless electronic ignition)
Adjustments
From a International owner's manual covering: C-152, C-196, C-304, C-345, C-392, C-446, C-537, C-605. Check it applies to your exact model before use.
Applies to: International C 549 engine
Before you start
- Dwell remains constant and should not require adjustment for the service life of the distributor unless sensor is moved
Procedure
- Rotate trigger wheel until one tooth is aligned with centerline of sensor (tooth perpendicular to flat surface of sensor).
- Using feeler gauge, measure air gap between sensor and end of tooth.
- Move sensor to obtain specified air gap; tighten sensor mounting screw and recheck air gap.
- Connect dwell meter to engine; operate engine at curb idle speed and observe dwell reading.
- If dwell is not within specified limits, stop engine and adjust trigger wheel-to-sensor air gap.
- Dwell decreases as sensor is moved closer to trigger wheel and increases as sensor is moved away.
- Dwell is affected approximately one-half degree per 0.025 mm (.001 in) of sensor movement.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Air gap: .20 mm (.008 in)
- Dwell limits: 26-32 FridayParts $25.60 (diagnostic check); 24-34 per specification sheet
Source: International owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.