Volvo I/O indentification 1990

[mwzoro]

I have a 1990, 2400 Imperial and no manuals. The spark arester cover says AQ231B. I have purchased 2 manuals Cymler and (can't remember name). Both manuals have AQ231A specifications. The Volvo Website only has a manual for AQ231A. Does anyone know what the differences are between AQ231A vs AQ231B? I am looking for specs for timing, point gap, plug gap, max RPM, idle, ect.<br />Also, the outdrive is a 275A Duoprop. The lift/ tilt is electo/mechanical (no hydraulics).My manuals show information for 270, 280, and 290. What heading should I be looking at?

 

[Haut Medoc]

Re: Volvo I/O indentification 1990

Welcome to iboats.. ...Don S will have all the answers you need.....Watch for his reply.....JK

 

[Don S]

Re: Volvo I/O indentification 1990

While it seems backwards, the 231A is actually NEWER than the B. Basically the only thing that changed in the 2 engine models is the outdrive. The A model had hydraulic trim and the 290 style transom shield. Your 275 drive has no trim, and only came as a single prop. By just changing the lower unit, the drive was upgraded to the DP by a previous owner.<br />If you download the owners manual from the Volvo site, it has all the tuneup specs for the 231.<br /><br />Concerning manuals, use the information for a 231A for the engine and a 270 for the drive. But,,,,,, forget the Clymer and Seloc manuals, too much wrong information and they try to put eveything all in one book and mistakes get made.<br />See your local Volvo Penta dealer and get service manual #7724371 for your outdrive, and #7732736 for your engine.