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    Question on water jacket cover removal

    I have a 1979 90hp I-6. After discovering water in the lower cylinder I pulled the powerhead and replaced the two crank seals. When I pulled the powerhead I noticed a lot of corrosion. After removing the cylinder block "head" cover, the exhaust manifold cover, and baffle plate I saw a lot...
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    707HF Chrysler (73' 70hp) question on electronics

    I have a rather generic question. Can anyone take me through the electronic sequence of this particular motor. What are all the functions of the different parts and how they work together? I think I have a basic grasp of it, but maybe someone knows this like the back of their hand and could...
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    Prestolite vs. Motorola

    So, I am curious on the direct comparison of the two. Side by side. I know that we have talked some about it before, but I cant think of ever seeing a side by side comparison. Just thought it would be neat to do. I personally am having a hard time with CD units right now in my brain. Of...
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    Homemade Gaskets

    I know this is a topic that gets discussed from time to time, but I thought it might be ok to bring it up again seeing how there are always new members and new experiences to be shared. With that said, I am in the process of putting back together my 70hp Chrysler and I am going to need some...
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    Corrosion, ever ate through a cylinder wall?

    I am having some corrosion issues with my 79' I-6. I also am having some water intrusion into cylinder(s). I have another post going with that, because I am hoping it is the lower crank seal and not related to the extreme corrosion I found when pulling the powerhead to replace the seals. In...
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    79' I-6 powerhead removal with pics

    Well, after conversing with guys on here about the issue of water in my lower cylinder, I removed the powerhead. I was not going to at first, not right now at least, I had planned on using a few more times before I was going to tear into the motor again. I had only seen a little, and I...
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    Water in inline 6

    Where are all the definite places water can get in a cylinder on an I-6? I would like to start diagnosing this problem, but I can only think of two areas. The end cap seal, and the exhaust gasket. Water is only getting into the very bottom cylinder. What are the diagnostic test to run? I...
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    Two different spark plugs??

    1979 90hp I-6, Two different plugs numbers. It takes a little bit to start, but it idles pretty well. All except for an occasional surge, but I think that is due to a little water intrusion on the bottom cylinder. I thought the plugs looked different when I started pulling them out one by...
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    90hp I-6 water in bottom cylinder

    So fixed some of the problems I had on the motor, but found one more. I made the maiden voyage with it last night, everything seemed to run good. Shut it off and back on several times. The last time after sitting for a little bit it would not start. I am going to guess that it was a flooding...
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    More questions on 90hp I-6

    It is a 1979 model if anyone is curious of that. But my questions transcend year models I believe. One of the PTT hoses came loose from the fitting. Its going to need new hoses. It is the one with 4 hoses and the pump/motor sits inside the boat. Question is, it does not seem to have a...
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    Good news and question on 90hp I-6

    Well after about a month of messing around with the motor I found I fired it up in a bucket of water yesterday. I had fired it up with a pull rope about two or three weeks ago with a gas mix sprayed in the cylinders, twice was enough for me. But yesterday was the first time to have her run at...
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    1979 inline 6 90hp water pump rebuild

    Doing the rebuild on the water pump. I took it apart real carfully, making sure to notice what went where and so on and so forth. Just doing the upper rebuild as the lower does not seem to need it at the time. I get the kit in the mail, and there are extra parts. I have read that this is...
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    1979 I-6, 90hp update

    so I have been working with this motor for some time now. Went through all the systems, few as they were; cleaned, checked, replaced. Then went on to the ignition, my biggest fear. Wiring harness was shot, literally, it crumbled in my hands when I went to look at it. So I replaced it. I put...
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    I-6 Ignition Fears

    So I am about to go through my ignition system on the newly acquired 1979 I-6 90 horse. I am having some trepidation of a faulty stator, switch box, and/or trigger. I know that me worrying about it is not going to make it not happen, but I thought I would ask a few questions before I proceed...
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    What are these on my inline 6? Pictures attached.

    So I am going through this motor, cleaning it up where it needs cleaning. I have pretty much covered all areas of it except for cracking the case open, which I plan NOT to do. It has good compression, so no worries there. I have run across two hoses that I would like to know the function of...
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    Max hp listing (rating)

    This is not technically about a boat motor, more so the boat, but it does involve motor issues, so I am not sure where to post this. But here is a question I hope someone can solve for me. I have a short shaft motor I want to put on a boat. It is a 50hp one and I have not been able to find a...
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    Plug wire resistance?

    1979 90hp, inline 6. What should the resistance be on the plug wires? I can not find the info for that in my manual. I can find stator, trigger and coil, but not plug wires. Thanks
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    1979 Inline 6 90hp

    I am cleaning/rebuilding this motor. I say that with some exaggeration because it is probably the cleanest motor I have seen. Not sure the whole story on it, but it doesnt seem all that used. I have pulled the carbs, fuel pump, and replacing the hoses. Other than that I do have a few...
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    Testing without Lower Unit?

    I know this may sound like a crazy question. Maybe it is, maybe not. But I can not seem to find where it has been asked before. Is is ok to test the motor without the lower unit on? I know, there is a big red flag with the fact you should NEVER run your engine without water flowing through...
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    1979 Inline 6

    I wrote a while back about this motor, 1979 90hp Merc. Turns out I am buying it from the guy. When I first tested it, for lack of a better word, I could not get the thing to turn very easily by hand. It just seemed real ruff. I was a little leery about it, so I did not pursue it too hard...
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