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Weak Cylinder on 20hp Kohler

Discussion in 'Mechanic and Repair' started by Turfer, Aug 11, 2001.

  1. PARKER124

    PARKER124 LawnSite Member
    Posts: 5

    IN RESPONSE TO YOUR DEALER'S COMMENT ABOUT A SHORT BLOCK NOT BEING ADVISABLE BECAUSE HE WOULD HAVE TO "BORE" IT OUT. SO YOU KNOW, A NEW SHORT BLOCK IS A COMPLETE ENGINE BLOCK LESS HEADS, FLYWHEEL, CARB, INTAKE AND OTHER, RUNNING GEAR. THERE IS NO REASON TO BORE A NEW SHORT BLOCK. HOWEVER IF THE HEADS ARE EXTREMELY WORN FROM DIRT A NEW ENGINE WOULD BE ADVISABLE, OTHERWISE A SHORT BLOCK IS A GOOD FINANCIAL INVESTMENT, PROVIDED YOUR DEALER DOESN'T CHARGE YOU MORE FOR LABOR THAN THE COST OF A COMPLETE ENGINE.
    GOOD LUCK WITH THE NEW ENGINE, OR SHORT BLOCK.
     
  2. Dave

    Dave LawnSite Senior Member
    from RI
    Posts: 315

     
  3. flipflopman

    flipflopman LawnSite Member
    Posts: 9

    Hi,

    We had a similar problem with our Onan 18 hp. One cylinder had a slight blow by. Enough that it used up 1/2 quart in about 5 hrs. It too ran fine and did not misfire. What we did was rebuild it by inserting a new sleeve, and piston on the bad cylinder and a just a new piston on the good cylinder, along with new set of gaskets. I would suggest you take your engine to a machine shop and have them machine your block and insert a sleeve into it. Our onan is going strong after the rebuild with no signs of any problems. And of course, no more smoke and adding oil necessary..... We paid 400 dollars for this.
     
  4. EJK2352

    EJK2352 LawnSite Bronze Member
    Posts: 1,150

    Turfer,
    Sounds like your dealer is blowing some big time smoke or doesn't know much about what he's doing. I'd consider replacing that engine with a complete NEW engine. You get a 2 year warranty on a new engine vs. a 90 day warranty on a short block. You also get new cylinder heads,carburetor,ignition, etc. etc.. If you go the short block route, be sure the dealer checks out the cylinder heads i.e.(valves, guides, seats, warpage) and does a valve job. Also if you get a new engine you can keep the old one for spare parts.:) ;) :) ED
     
  5. Turfer

    Turfer LawnSite Member
    Posts: 99

    I did put a new engine in my Walker. I went in the shop and talked to the mechanic that worked on my machine. He said there was allot of debris in my engine that probably caused the problem. He showed me a piece on the new engine that was missing on my old engine. It was the metal plate covering the air filter under the air filter cover. It definitely was not there because I removed and cleaned the carb twice plus replacing the filter and cleaning it numerous times and I never saw it. He said they could have short blocked it but the guarantee was only 90 days. With the amount of sludge in my engine, he said I would be taking a real chance. The breakdown on the pricing was another new engine sale for me. Short blocking would have only been a few hundred dollars cheaper and like you said, I get a 2 year warranty with the new engine. I'm satisfied with the results and the dealer has been real honest about all the business I have done with him. The Walker may move back to the number 1 slot ahead of my GD chariot because it drives so different with the new power. Thanks for all your help.
     

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