expert eye???

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stinkycharlie

Cadet
Joined
Jun 27, 2006
Messages
26
hi,
here is a picture of a 1991 mercury 115. i was thinking about purchasing this engine but i noticed some slight corrosion on the power head and just below. does anyone have an idea if this is normal orwhat causes it?
 

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emckelvy

Commander
Joined
Jan 16, 2004
Messages
2,506
Re: expert eye???

No pics to see but not uncommon to see salt seepage around gasketed joints, or if run in fresh water with hi alkali or mineral content.

More important is the compression balance of each cylinder; and how it idles, shifts and operates at speed. Don't just run it on a flusher but in the water if possible.

These 4-cyl Mercs run real funny on a flusher because of the way the idle circuits are designed. One carb is very lean so the motor idles way down in the water, then when you gas it an accelerator pumps masks the lean condition and allows the motor to pick up smoothly.

Out of the water there's no backpressure which makes them idle faster than normal.

Anyway, check it out carefully and unless the thing is corroding horribly it's not unusual.

HTH & G'luck.........ed
 
rickdb1boat

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: expert eye???

Do you have them uploaded to a host, such as photobucket.com? You must do that first in order to post pics...It's free....
 
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stinkycharlie

Cadet
Joined
Jun 27, 2006
Messages
26
Re: expert eye???

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