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  1. M

    Black scuff marks on cylinder walls

    Number 4 cylinder is the darker plug and all the other cylinders are the lighter plug. Why is the one cylinder causing the plug to look this way?
  2. M

    Black scuff marks on cylinder walls

    It’s very easy to determine if a gasket has a coating. For example my head gaskets. They come with a coating. My power head adapter did not so I put a light coating of sealant on it just in case. There are no passages to clog so I’m sure it will be just fine.
  3. M

    Black scuff marks on cylinder walls

    I agree. I’ve used sierra a lot of times and never have had one issue
  4. M

    Black scuff marks on cylinder walls

    I’ve seen gaskets for other engines that are a lot thicker and have some metal material. But for this engine they don’t exist unfortunately. I have to use what’s available. I installed it with gasket sealing compound and seems to be fine. I’ll know more when I fire her up
  5. M

    Black scuff marks on cylinder walls

    That’s all that’s available for this engine. Is a paper gasket. I’ve searched everywhere. I was a technical inspector on chinook helicopters in the military. I’m pretty good at researching. No such gasket exist other than paper material
  6. M

    Black scuff marks on cylinder walls

    The gasket I have for the power head says made in USA. So that’s good enough for me. Could be Chinese or worse
  7. M

    Black scuff marks on cylinder walls

    The omc gaskets and sierra gaskets literally look and feel like the same thing. That’s why I bought sierra. It was $50 cheaper for the kit
  8. M

    Black scuff marks on cylinder walls

    I had already purchased the entire gasket kit at that point. And I bought the one made by sierra from wholesale marine.
  9. M

    Black scuff marks on cylinder walls

    Thank you for that insight. That helps me a lot! I appreciate it!
  10. M

    Black scuff marks on cylinder walls

    This is the manual. I’m pretty sure it’s omc. The gasket is sierra.
  11. M

    Black scuff marks on cylinder walls

    Do you use sealant on the power head to adapter gasket? My manual says no but I don’t know if I trust not using it
  12. M

    Black scuff marks on cylinder walls

    I’m torn between a decision. I’m putting the power head back on but the manual calls for no sealant on the power head adapter gasket. It just seems like failure considering it is just a paper gasket. Most people say to not put any sealant on that gasket. Can any of you give me any insight on...
  13. M

    Black scuff marks on cylinder walls

    Good to know. It scared the crap out of me. I really do appreciate everyone’s advice and input. It’s helped me tremendously while working on this motor. Thanks again!
  14. M

    Black scuff marks on cylinder walls

    I just figured since it was on the hot side of the piston the heat caused those pin holes. Thanks for the help and information!
  15. M

    Black scuff marks on cylinder walls

    Ok it scared me when I saw them. There’s quite a few in almost all the ports. Just wanted to make sure it’s all good. Thanks!
  16. M

    Black scuff marks on cylinder walls

    Do you know what these little pin holes are? Looks like corrosion or something. The pits aren’t too deep but there’s quite a few of them
  17. M

    Black scuff marks on cylinder walls

    So I’m assuming the big thick black one inside the crankshaft head seal is what stops water from from back up into the motor and keep oil from leaking out. That and the seal
  18. M

    Black scuff marks on cylinder walls

    Thank you so much!
  19. M

    Black scuff marks on cylinder walls

    It’s a 1994 Johnson 90hp v4. Model number J90TLERC. I have looked at multiple diagrams and cannot seem to figure out if it’s suppose to have an oring below the splines. I am replacing the bottom crankcase seal and the oring that sits inside the sleep that goes at the end of crankshaft that...
  20. M

    Black scuff marks on cylinder walls

    There is definitely a spot for one on the driveshaft. But there’s also a big oring inside the crankshaft head cover. So does that seal the driveshaft or does it need an oring added on the driveshaft as well?
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