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used mercury motor

rrcop's Avatar

Join Date: Dec 2001
Posts: 35

02-23-04, 07:04 PM   #1  
used mercury motor

i am considering buying a pontoon boat with a 60 hp. motor. it is an 94 mercury 3 cyl. motor with oil injection. The guy selling it says it has good compression approx. 150-160 lbs. That don't tell me anything. Can anyone advise what i should be wary of and what to look for? i am going to listen to it run but don't know what else to look for..

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Ed Imeduc's Avatar

Join Date: Aug 2002
Posts: 18,389

02-24-04, 04:40 PM   #2  
Id be sure and check lower unit. To see that there is no water at all in it, that the seals are ok. just pull bottom plug ED

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Join Date: Feb 1998
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02-25-04, 03:29 PM   #3  
My Two Cents

Hello: rrcop

Ed makes excellent points, to which I will add.

Engine compression is vital information. Compression testing is done on all engines and tells a professional mechanic a lot about the engines.

Especially on the engines wear on rings & valves (rotary valves too) etc. Compression also tells much on how the engine was used and it's currently condition based on prior usage when compared to it's age, etc.

It's all in knowing what to do with the information and what that info tells the trained person whom reads it.

Boat appraisers perform compression tests of all boat engines when they are hired by a boat or yacht purchaser as part of the inspection report to the buyer.

In my opinion, an over all paid professionals appraisal is not needed for a small boat purchase. But the compression test is needed. The sellers word means nothing in a private sale.

Engine replacement would be expensive for a new 60 HP engine.

Regards, Good Luck & Safe Boating.
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