Recent content by ianmoore

  1. I

    115 6c TOP piston cylinder issue

    I texted the machinist yesterday morning after my findings, and ended up taking the block to his shop. We were talking about boring all the cylinders, and whether to bore them all to .03, or take the standards to .015, and the 3 .015 to 30. We took all the pistons out and weighed them on the...
  2. I

    115 6c TOP piston cylinder issue

    yes. spec is .003. Im going down the rabbit hole because the machinist didn't provide this information and i wasn't comfortable re-assembling engine without more data.
  3. I

    115 6c TOP piston cylinder issue

    OK. I think i got all of this somewhat straight. Mercury wording is a little convoluted and confusing, but the biggest measurement is 90* to wrist pin. All of my OEM are coming in a bit smaller than those numbers. My clearances are pretty big, around 6-7 thousands on the 3 cylinders im looking...
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    115 6c TOP piston cylinder issue

    I am about to finish installed new pistons, but I’m trying to make sure all my measurements are correct. This pistons measurement is confusing to me. It seems that it’s asking for 2 measurements but it seems they would clarify that. I don’t know how one measurement, at wrist pin, could both be...
  5. I

    115 6c TOP piston cylinder issue

    Spent the last day learning micrometeres and bore dials. The ones i got don't suck, but they aren't machine shop level. Here is what i have on the 3 im working on.: lost compression in C1 and C6. Was taken to machine shop Cylinders were not bored or sleeved. Machine shop performed a light hone...
  6. I

    115 6c TOP piston cylinder issue

    I did split rod bearings, cages, and caps, by piston. I am getting some real micrometers, and a decent dial bore guage. I'm going to go through the cylinders and get some numbers. This is too much work to just slap it together(Ive rebuilt everything but lower unit) and I want to make sure it is...
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    115 6c TOP piston cylinder issue

    No! I appreciate the time and detail. This is all new to me. It is strange that it doesn’t talk about ring gap in the manual, but I’m going back through and measuring that now. I had about .006 at 1” and bottom in c2(standard). That was the one I broke the ring on, but again, think it was from...
  8. I

    115 6c TOP piston cylinder issue

    Wow! Thanks for the details. This is all such an education. I wish I had that communication and detail from the machine shop. Honestly, I thought I wasn’t going to be able to get anyone to do the work and was gonna be sitting on a broken block. That said, I have very little detail on what was...
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    115 6c TOP piston cylinder issue

    Ive never installed a piston in a cylinder, so lets start there! Do you have any thoughts on my question? I had compiled some notes on assembly. One person had mentioned checking end pin by turning the piston in the cylinder after it was installed. My question/concern was that i thought the...
  10. I

    115 6c TOP piston cylinder issue

    Wow. That is a sensitive engine! I'm assuming you had it down at 650-700? I was told you had to keep your idle a little hotter. I am pretty good with the non-ethanol gas and using Marine stabil when its sitting, but here in the puget sound, with not many fuel docks, it is hard to be that on top...
  11. I

    115 6c TOP piston cylinder issue

    quick question: I have built my pistons and started installing them. I had 4 of them in(waiting for rings for 2 pistons) and was checking through exhaust ports. All 4 seemed to have the same up and down feel, and the rings seemed tight in the ring lands. I had a note to check the ring stops to...
  12. I

    115 6c TOP piston cylinder issue

    When i first got it I had never messed with a motor before, so everything, including adjusting the timing, is a bit suspect. I think i got it right, and i followed the manual..The engine ran well, but it was hard starting cold, and i had i set the idle screw a bit hot for it to idle well. I got...
  13. I

    115 6c TOP piston cylinder issue

    My idle is a little high. When I first got the motor and was getting to know it I was told that was “just how it was” with old Mercs and the trade off was biting the gears a bit. I could never get it much below 950. My attitude is since it’s all apart, I should replace what I can. That stuff...
  14. I

    115 6c TOP piston cylinder issue

    Interesting. I’ve been working on the crankshaft. It looks pretty good( cleaned up a bit of grit on one bearing-now smooth) and noticed the alternating 5 petal, 4 petal arrangement. Nothing mentions this. Is this something Mercury did? I have a couple of petals that are more than the...
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    115 6c TOP piston cylinder issue

    I can see a retaining ring. It seems that to remove the upper bushings I could cut the nut and pull back but maybe the screw wouldn’t pull out. I’m realizing I’m probably gonna have to drill out the 5 bolts to the middle exhaust. They are so corroded and there is no way other than that to get...
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