Topic: Mercury 175 hp xri

Mercury 175 hp xri

Bought my boat in July had a mariner 150 carbed engine blew powerhead almost a month to the day after I bought the boat. Was going to rebuild powerhead but the block was compromised as well as the crank. I found a "lightly used" rebuilt 1993 merc xri 175 hp engine runs good starts right up accelerates good feels healthy. Oil injection removed making sure this one stays lubed! Rod bearing went on my old motor probably from a lack of oil. My only major concern is compression is 110, 110, 118, 110, 105, 95... Thats a bigger spread then I would prefer obviously. But I have dumped every bit of money I have on this boat and a rebuild isnt in my near future. Are these numbers low in general for an xri? I thought I had read somewhere that they were a higher compression engine like 120 135 range? Is that accurate? I only run premium fuel and use quicksilver or merc oil let my engine warm up good before running and Im not over revving 5300 RPMs. With me being nice to her what kind of life expectancy can I hope for with it? I know thats kind of a shot in the dark but curious about what you guys have experienced with your engines over the years. Im new to the high horsepower performance boats world. Thanks in advance!Kip

This topic has 5 replies, 3 voices, and was last updated 10 years, 7 months ago by Bass Cat Boats.

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October 15, 2014 at 10:24 am #370249

Bass Cat Boats
Keymaster

the 95 ,105 maybe nothing more than carbon on the rings or get two head gaskets and pull the heads check for scoring .

October 15, 2014 at 11:29 am #370253

Bass Cat Boats
Keymaster

Today a imaging scope will see everything you can see with the heads off for an inspection. Pull a spark plug and stick a camera in the hole. The 10 PSI off doesnt concern us initially.

October 15, 2014 at 2:19 pm #370255

Macintosh
Participant

Isnt the difference between 95psi to 115 PSI a pretty significant difference? Thats almost a 20% difference–I know when I was looking recently the mechanic I was using told me if I was looking for a well-kept motor I should be looking for less than a 10% difference between highest and lowest cylinder, or better yet a leakdown test of 5% or less.

October 15, 2014 at 2:34 pm #370257

Bass Cat Boats
Keymaster

Thanks for the replies guys. Basscat thats exactly what the shop just told me. They have a tec in the shop who has been working on and own several Mercs for over 30 years and he said it didnt concern him one bit as long as I maintain things properly and keep it oiled, I should and could get 100s of problem free hours out of it. They just called me this morning and told me shes ready to pick up. Thanks again, much appreciated. Kip

October 15, 2014 at 7:21 pm #370260

Bass Cat Boats
Keymaster

Macintosh is right on performance differences though as long as the ports are clean and there is not grooving you should be good.
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