'99 90ELPO Merc Oil Tank Replacement Questions

M

mikeneal

Senior Chief Petty Officer
Joined
Jan 28, 2004
Messages
710
I have a leaking oil tank when the '99 90 Merc is trimmed up. Looks like the inside of the tank neck is hammered so I ordered new tank and cap o-ring. My question is looks like there is a lower mounting bolt that requires removal of lower cowl. Anyone have tips/suggestions for the job? I am fairly mechanically inclined but 1st OB boat I have ever owned. I also ordered a factory manual for it so hopefully that helps. I was planning on running boat on stand alone fuel tank @ 50:1 for a while to make sure oil system is bleed out. Required?
 
j_martin

j_martin

Admiral
Joined
Sep 22, 2006
Messages
7,474
Re: '99 90ELPO Merc Oil Tank Replacement Questions

mikeneal said:
I have a leaking oil tank when the '99 90 Merc is trimmed up. Looks like the inside of the tank neck is hammered so I ordered new tank and cap o-ring. My question is looks like there is a lower mounting bolt that requires removal of lower cowl. Anyone have tips/suggestions for the job? I am fairly mechanically inclined but 1st OB boat I have ever owned. I also ordered a factory manual for it so hopefully that helps. I was planning on running boat on stand alone fuel tank @ 50:1 for a while to make sure oil system is bleed out. Required?
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In the factory manual will be a procedure for filling and starting up the oil injection system. Put on a part tank of 50:1 premixed fuel till you get the oiler set up and proved. Then just add gas to the fuel tank.

A little oil in the gas won't hurt anything. I run about an ounce of oil to a gallon of gas along with the VRO. Just insurance, plus I run the XR4 a bit harder than the specs say I should.

hope it helps
John
 
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