new cv25s hard to spin over

Discussion in 'Mechanic and Repair' started by npilcher, Jul 6, 2006.

  1. npilcher

    npilcher LawnSite Member
    Messages: 27

    I recently replaced my bobcat zt200 engine. It is a cv25s spec 69538.
    the engine is new, however when you attempt to spin it over, it wants to spin 1 round then lock. Spin another round then lock. It sounds like it has so much compression its hard to spin over. Problem gets worse as the engine heats up. New battery, and I also added jumper cables from the truck to the new battery with no luck. It does appear to have a little voltage drop b/w the battery and the starter. Approx. .50 volt. The starter also sounds a little rough when spinning over. The engine runs perfectly just sluggish to spin over. Any suggestions

    FIXDISS LawnSite Senior Member
    Messages: 445

    Wow ! A new engine should not be giving you that problem. Sounds like the compression release which is internal. Remove the belt from crank or make sure it is not grabbbing when trying to crank it. If it still won't turn then see if you can manually turn the engine by hand using the blower screen.If you can't take it back to dealer .
  3. Jim@MilkyWay

    Jim@MilkyWay LawnSite Senior Member
    Messages: 472

    Have you taken the spark plugs out to see if starter will then spin engine freely?
    Guys, is it possible timing is greatly advanced, thereby not allowing engine to turn with starter? In other words, is it firing too early? :confused:
  4. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Thats what I was thinking about the plugs...

    FIXDISS LawnSite Senior Member
    Messages: 445

    Another possibility is improper valve lash but with hydraulic that could only be caused by the rocker arm fastener nuts backing off or the studs pulling out. You could also have a bent pushrod. You can check by pulling valve covers and checking torque on fasteners.

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