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Author Topic: merc 700  (Read 2600 times)

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Offline TomLund

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merc 700
« on: February 19, 2012, 01:20:20 PM »
What is good compression for a merc 700 its a 3 cyclinder? I can't seem to find any info on internet about it.

Thanks Tom
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Offline Hyperacme

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Re: merc 700
« Reply #1 on: February 19, 2012, 01:27:42 PM »
Would guess 110 to 130, give or take a few ...
What ya gettin' ?
Have ya tried soaking pistons, rings, ring lands with Power tune or Seafoam ?
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Offline Jason

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Re: merc 700
« Reply #2 on: February 19, 2012, 01:46:45 PM »
According to Mr. Sellner, a leak down test is more important than compression. But you need a fancy tester for this.
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Offline TomLund

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Re: merc 700
« Reply #3 on: February 19, 2012, 02:32:58 PM »
I already have the merc 700 on my four winns 150 but when i put it away it didn't seem run right i am stuck right now with my 66 and no place to work on that i am so bored i have been thinking of working on that motor too.

Cabin fever sucks lol

Tom
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Offline wiliermdb

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Re: merc 700
« Reply #4 on: February 19, 2012, 04:09:11 PM »
You can pick up a compression test kit as well as a leak down tester for under $100 at Harbor Freight tools. I gave my family a list of tools I needed (wanted) for my workshop and I brought them to the guy who did the work on my old 115. He used it side-by-side with his expensive Snap-On sets and it was dead accurate.  Both come in a nice hard case for safe storage. Picked up a spark tester as well. Already used it to rule out a couple of motors I was interested in purchasing.
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Offline TomLund

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Re: merc 700
« Reply #5 on: February 20, 2012, 05:46:51 AM »
Thanks guys i got a call last night a guy is supposed to be coming out tuesday to look at it hopfully it will go on the back of his truck that night if not i will continue to start working on it. I need that money to dump into my 66 i would cross my fingures but that never seems to work lol
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