RED-Z06 2,221 #1 Posted July 22, 2023 I was given a 2005 Toro Zmaster a few weeks ago for parts, all i was told was it stopped running 7 years ago and wasnt moved from that spot. 23hp Command, 60" ultraforce deck. Everything was stuck, engine was stuck but did free up. Starter was missing so that was my first task, i bolted on a starter and a new battery and to my absolute shock..it spun with the key. However..it had no compression. Pulling the plugs revealed air moving...so the rods were intact. Pulled the valve covers and none of the rockers moved, the cam was visibly not turning. That led me to pull the muffler, clutch, and rear closure plate and found carnage..20 teeth sheared off the cam, rear cam journal broken off, i found a stuck lifter. Im assuming, based upon no evidence of loss of lubrication anywhere, that the #1 intake lifter seized in the bore..the cam stopped..and nothing else did..the cam shed teeth and finally broke. I ordered a GM lifter bore hone, 4 new lifters, a cam kit, i honed the bores using brake kleen as lube, new lifters in, new cam in and timed it. Plate back on...and...nadda, blowing out the intake, timing issues. Pulled the rear plate off and verified my marks. I remembered years ago that kohler twin crank gears are a very tight interference press fit..but could slip...and that if the keyway us down..the timing mark should be 180⁰ opposite. Mine was 110⁰ out of time. So i brought my keyway to 6 oclock and indexed the cam to straight down. After cleaning the carb it fired right up..runs great. So..if you ever come across a command twin out of time...this retimes it. 5 Share this post Link to post Share on other sites
JoeM 7,874 #3 Posted July 22, 2023 Do you know the hours on the engine? Petty amazing that it was not further destroyed. How much are those cams going for? Share this post Link to post Share on other sites
RED-Z06 2,221 #4 Posted July 22, 2023 59 minutes ago, JoeM said: Do you know the hours on the engine? Petty amazing that it was not further destroyed. How much are those cams going for? I honestly dont...the factory original hour meter is intact and reads 00000, so im guessing it never worked. New OEM cam was $130, Hydraulic lifters were $60 set of 4. 1 Share this post Link to post Share on other sites
Tuneup 1,433 #6 Posted July 24, 2023 Fantastic diagnostics! Isn't it typical that machines that die on a Southern property tend to stay there until they disappear into the sand? I resurrected two from that condition. Share this post Link to post Share on other sites
RED-Z06 2,221 #7 Posted July 24, 2023 2 hours ago, Tuneup said: Fantastic diagnostics! Isn't it typical that machines that die on a Southern property tend to stay there until they disappear into the sand? I resurrected two from that condition. Its usually too hot to screw around with them 🤣 1 Share this post Link to post Share on other sites
Wild Bill 633 846 #8 Posted July 25, 2023 Another Kohler Command with similar failure. https://simpletractors.com/forums/topic/67523-kohler-command-rebuild/ Share this post Link to post Share on other sites
RED-Z06 2,221 #9 Posted July 25, 2023 9 minutes ago, Wild Bill 633 said: Another Kohler Command with similar failure. https://simpletractors.com/forums/topic/67523-kohler-command-rebuild/ Wow that looks eerily similar Share this post Link to post Share on other sites
