hd2002hd
Member
- Jul 20, 2010
- 457
- Boat Info
- 1996-Sea Ray 215 Express Cruiser/1996-Sea Ray 330 Sundancer/1998-Sea Ray 400 Sundancer/1996-Sea Rayd
- Engines
- 5.7 Mercruiser/454's/454's w/V drive/120HP
What engines do you have?
If they are the 7.4L (454cid) or 8.2L (502cid) the timing needs to be set to 8 degrees BTDC while in "Service Mode".
To get into Service mode you'll need a Scan Tool or what MerCruiser refers to a Timing Tool, part number 91-805747A1. The Timing Tool is a connector with two pins jumpered together. It plugs into the same port as a Scan Tool - Data Link Connector.
With the engine in Service Mode the ignition advance is held steady and the RPMs will jump up to 1800rpm. The RPM increase will only happen on MEFI-2 and MEFI-3 revision ECMs. If yours is an MEFI-1 you need to manually adjust the throttle to 1800rpms. Now your ready for the timing light.
Good info. I had no idea.