Likes Likes:  0
Thanks Thanks:  0
HaHa HaHa:  0
Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: I sure messed up / Blown '88 DT150

  1. #1
    Join Date
    Feb 2008
    Location
    Waverly @ Cuba Landing, TN
    Posts
    399
    Post Thanks / Like

    Default I sure messed up / Blown '88 DT150


    Just got this motor w/ a bad lower unit, and My blown motor with a good lower unit. Was doing fine until I forgot to clear the raw gas out of my fuel lines, before I primed the carbs. Now I have 2 blown motors.

  2. #2
    Join Date
    Mar 2008
    Posts
    212
    Post Thanks / Like

    Default

    Very sorry to hear that. Were you running it fast or just idle?

  3. #3
    Join Date
    Feb 2008
    Location
    Waverly @ Cuba Landing, TN
    Posts
    399
    Post Thanks / Like

    Default

    fired it up on muffs, and it acted cold and didn't want to run at idle speed so run it up about 1800 rpms, not high but high enough

  4. #4
    Join Date
    Jul 2006
    Location
    Cullman AL.
    Posts
    558
    Post Thanks / Like

    Default You may be OK

    If the rings siezed, you may still be OK. But it the bearings and crank are scored you have some awful choices to make.

    Right now I need a starter for my 78 Johnson (85 Hp) and I'm almost in the same boat as you when it comes to bucks over need.:o
    I just wish I could be better at fishing. Or maybe luckier!:D

  5. #5
    Barnacle Bill's Avatar
    Barnacle Bill is offline Super Mod and 2014 Crappie.com Man of the Year * Crappie.com Supporter
    Join Date
    Apr 2004
    Location
    Chesapeake, Va
    Posts
    20,315
    Post Thanks / Like

    Default

    Just the raw gas in the lines isn't enough to blow the motor. Have you ran a compression check?
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


  6. #6
    Join Date
    Feb 2008
    Location
    Waverly @ Cuba Landing, TN
    Posts
    399
    Post Thanks / Like

    Default

    Not with a gauge but spun it while holding finger over that cylinder, no piston push, as with the other cyl's. Boy I'd sure like it to be something else. I guess even if it didn't hole the cyl, it probably broke a ring, and that's not going to be a pretty scene in the cyl wall. I haven't pulled the head off yet. I'm working under a shade tree, and we've been under this big cold front. It dipped to mid 30's yesterday and was rain/snow mix most of the day.

  7. #7
    Join Date
    Mar 2008
    Posts
    212
    Post Thanks / Like

    Default

    Blow the head and exhaust cover off of it and see if you scored the piston/cylinder.

  8. #8
    Join Date
    Feb 2008
    Location
    Waverly @ Cuba Landing, TN
    Posts
    399
    Post Thanks / Like

    Default

    Supposed to be better weather tomorrow, if I get home early enough I'll do that. I was so sick about it happening. I just covered the boat and went inside. I've called a couple of mechanics, and I'm looking at $$$$ if they do it all, and I'm a little lacking for this kind of severity of mechanicing. I could take it apart and all, but measuring clearances with any kind of knowledge, is a little out of my league for these kind of motors. I've rebuilt lawnmower engines, but multi-cylinder and two cycle are a different class than lawnmower engines. But either way I go, it'll have to be on a tight budget, I'm stretched pretty good right now. My work has slowed to about 4 days a week. My reserves are short now.

  9. #9
    Join Date
    Mar 2008
    Posts
    212
    Post Thanks / Like

    Default

    Get a manual, and take the plung. You can do it. You are just adding more cylinders with no camshaft.

  10. #10
    Join Date
    Feb 2008
    Location
    Waverly @ Cuba Landing, TN
    Posts
    399
    Post Thanks / Like

    Default

    I took apart both motors left side heads. I have more problems than I first thought. The good news is the cyl walls on the left side at least are not scored. The bad news is the piston came apart at the wrist pin, and pieces of the piston put a hole in the intake half of the crankcase. Also, the 87 has been bored .015 over. So I'm guessing that it'd be better to buy a matching size piston for the 88 cyl than to have half the motor with oversize pistons and the other side at original size. I would make and educated guess it would create some imbalance and wear out or tear apart the motor at high revs? I can tear apart the 87 crankcase to get the intake half of the crankcase, it would just involve a whole lot more time and effort. So my question is, do you think its possible that I could get it going with minimal cost. And would I need to hone all the cyl and have the crank worked on if they visually look alright. Meaning, no scoring. If there is scoring then it would mean all new rods/bearings,etc. Cost would start climbing then. I was hoping for bores being the same and just switching jugs and pistons without honing, but that was before I knew I had a hole in the crankcase. Whatcha think?
    Attached Images Attached Images      

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

BACK TO TOP