BrianAmberjack
New Member
- Jul 19, 2021
- 13
- Boat Info
- 1989 Sea Ray 270 Amberjack
- Engines
- 4.4L Mercruiser Alpha I X 2
To my knowledge the distributer does not self-advance on this engine. I loosened the hold down bolt on both distributers in order to adjust their respective timing-at-idle to 8 DBTDC, in accordance with the manual. After that, the only timing adjustment that takes place is through the "Ignition Amplifier" Thunderbolt ignition module. As I wrote in the OP, I exchanged that entire system with the known-good-parts of the starboard engine, and tested for auto-advancement by that module, up to 2000rpm. Timing did advance all the way to 12 DBTDC, and the fault stayed with the Port engine.No I was thinking distributor advancing issue but if it happened after the outdrive swap you may be on to something there