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Hello,
I'm working on my 1995 OMC Cobra 4.3GL at the moment.
I try to tune-up the ignition timing of this engine.
I have the seloc and the clymer manual. I don't know why, but the give two different timings.
Clymer calls for 5° ATDC, Seloc for 5° BTDC with 86-88 octane, and 0° TDC with 89 octane gas.
Volvo Penta 0° TDC.

Does someone has the original workshop manual for this engine and can give me the right values?

BTW I'm used to the procedure with the shunt.

I don’t have a manual for that model year but I can tell you that the older models like mine were timed at 6*BTDC if using premium gas and 1*BTDC if using regular. Since you have a joint venture product the engine and specs should be the same as a Volvo Penta model of the same year.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

hey, thanks for the reply.
here we have gas with 95 octane.

Are the 6°BTDC with that timing tool (V/P no. 885163), or without?

Well the 6* BTDC, should be set before any ignition advance starts, so it I'm thinking it should be with the timing tool hooked up.
I have an ancient Prestolite points distributor with mechanical advance. I have always set mine initial timing at 6* and used premium gas and never had a problem with detonation or pinging.

_________________
88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II