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  1. #1

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    when to replace the crank?

    okay so I lost the middle cylinder on my ultra from no oil and I also lost the 3rd cylinder at the same time due to cooling line being clogged. Well it scarred both jugs and caused the engine to seize from heat. But only for a few mins. it was able to restart and get back to the dock. It kept good compression and ive already pulled the engine.........Now the question is do I replace the crank? It feels smooth and no odd noise. Little bit of rust on the counterweights but overall clean. Should I break the case and inspect? The rods still look good with no major discolor and they measure same length....Ive heard cranks can go 400hours


  2. #2
    TexasZ's Avatar
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    How many hours are on it now?

    Since you have the motor out anyway and I assume you're pulling two of the cylinders, I would go ahead and split the cases. #1 To replace the crank seals...most times long overdue and a leak from them will lean out your cylinders again. #2 So I could clean out the cases and make sure there's no metal particles left in there. #3 To better inspect the crankshaft.

  3. #3

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    yes......but what do I look for?

  4. #4
    TexasZ's Avatar
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    Quote Originally Posted by TexasZ View Post
    How many hours are on it now?
    At a certain point, "it's time". So how many hours are on it now?

    You're looking for signs of heat and to make sure the bearings are rolling smoothly and without any slop.
    If I was wondering about it, I would pack it up and send it to crankworks and let them check it out. They have a good reputation around here .
    http://www.crankworks.com/

  5. #5

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    okay, broke down the engine. Crank looks good, bearings roll smooth. What do you mean slop? like play side to side? its got 150 hours

  6. #6

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    its honestly something I just want to last the rest of the summer and ill break it down again over the winter for complete overhaul.

  7. #7

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    okay I checked the play just with my hands and they barely barely move.

  8. #8
    TexasZ's Avatar
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    You have it tore down. You will need a complete gasket set along with the other essentials to put it back together no matter how short of a time or how long of a time you plan on leaving it together.
    Just me but I would at least splurge on a set of factory OEM crank seals.

    For just a few hours more work and a few bucks more, you can build it at this point to stay together and be done with it.

    Do a leak down test on the motor after you build it. Replace those old stiff ready to crack oil lines too and make sure each oil line is going to the right place.
    Do you have a service manual? If not I will get you an online link to one.

    There's a bunch of good folks here to answer questions, give good advice, and get you through this build.

    Build it, ride it, go have a blast on it.

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