Cummins/Onan 627.20199 — Ignition Timing Adjustment
Adjustments
For the Cummins/Onan 627.20199, from the Cummins/Onan owner's manual.
Applies to: Craftsman 627.20199
Before you start
- Do not use 12-volt coil tester; use 6-volt tester.
Procedure
- Remove cover from breaker box.
- Loosen mounting screws and shift breaker box to align witness marks if far off.
- Slowly crank engine by hand until flywheel witness mark and TC mark on gear cover align.
- Adjust breaker point gap to 0.020 inch (0.51 mm) at full separation.
- Turn flywheel left about two inches past 25 degree mark, then slowly right.
- Note whether points just separate when TC mark aligns with correct degree mark (19 or 25 degrees).
- Loosen breaker box screws and shift slightly if timing incorrect.
- Tighten breaker box mounting screws securely and reinstall cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark advance 20 degrees before top center
- Breaker point gap 0.020 in (0.51 mm)
Full service-parts list: Craftsman 627.20199 →
Source: Cummins/Onan 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.