1988 90hp mercury oil injection

rp75951

Recruit
Joined
Jul 6, 2013
Messages
5
I have a 1988 mercury 90hp outboard with oil injection, is it better to let motor mix oil or should I disconnect and mix myself?
If better to mix myself how do I disconnect oil injection? Also where can I get a service manual for this unit?
 

TD_Maker

Chief Petty Officer
Joined
Aug 31, 2005
Messages
564
Re: 1988 90hp mercury oil injection

Carholme is on this. I bow before the Guru. Do what he says.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,589
Re: 1988 90hp mercury oil injection

The 3 cylinder 75-90hp have a bottom driven oil pump that rarely fails( only seen 2 ) , most of the problems is false alarm from magnet in tank falling off or bad sensor or module. I myself say leave it alone.....JMO
 
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