Need procedure for setting timing on OMC 4.3

M

mspencer

Recruit
Joined
Aug 15, 2006
Messages
4
Hi. I need to set timing on 89 OMC 4.3, but not sure of the proper procedure. Can any one help with this? Thanks.
Mike
 
J

jfcar

Cadet
Joined
Jul 22, 2006
Messages
28
Re: Need procedure for setting timing on OMC 4.3

Adjust idel speed to in-gear RPM (my 1991 4.3 OMC Cobra is 550-650 RPM), then shift into neutral. Set timing tighten clamp bolt recheck. My timing call for 6 degrees BTC with 89 octane or greater fuel, 0 degrees for anything less.
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,476
Re: Need procedure for setting timing on OMC 4.3

Have you checked your timing before?

Do you have and know how to use a timing light?
 
M

mspencer

Recruit
Joined
Aug 15, 2006
Messages
4
Re: Need procedure for setting timing on OMC 4.3

Yes I have checked timing before. But all my experience is with older cars with vaccuum advance and wanted to make sure ther was nothing special I had to do because of being marine and no vacuum advance. Thanks again.
mike
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,476
Re: Need procedure for setting timing on OMC 4.3

Nothing special. There is no vacuum advance.
 
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