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8 HP Techumseh Starting Problems - need Help - Pictures

Discussion in 'Mechanic and Repair' started by 1966vette, Jun 12, 2010.

  1. 1966vette

    1966vette LawnSite Member
    Messages: 209

  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Andy, I can't tell you about any parts interchange on this machine without a model number to check for any superseded numbers.

    Sometimes when the ink is rubbed/worn off the decal a flashlight can be held shinning across not on the decal, While doing so look across the decal from different angles and the imprint of the numbers can be seen.

    Can you post the engine serial number ? That may get close on a build date.....

    As far as straightening/welding on one of these wheels, Not I ......
  3. 1966vette

    1966vette LawnSite Member
    Messages: 209

    I plan to purchase a new shredder blade estimated at $20 & have the plate repaired by a welder for an additional $25.
    A new plate is $230 + shipping.
    I’m seeking functionality @ minimum costs.
    Thus, it does not make sense to add another $250 to this machine.
    I will plan to provide pictures of the repaired plate.
    Thanks again for all your help!
  4. 1966vette

    1966vette LawnSite Member
    Messages: 209

    My 8 HP tecumseh HM80-155426M on my MTD chipper has no spark.
    I removed the flywheel to check on the flywheel key after the Sunday chipper blade crash. This is what I found:
    1. flywheel magnetics were ocvered w/ rust
  5. 1966vette

    1966vette LawnSite Member
    Messages: 209

    I removed the flywheel on my 8 HP Tecumseh engine to determine if the flywheel key was damaged during last Sunday chipper blade crash.

    This is what I found:
    1. Flywheel magnets were covered with rust
    Solution – removed rust with wire on bench grinder

    2. Both legs of the armature / coil were covered with rust.
    Solution – removed rust with wire on bench grinder

    3. This engine is solid state & does not use points?
    Check for points & assumed secondary voltage in coil must be opened with 2nd set on magnet in flywheel.

    This is the armature on my engine.
    For TVM, TVXL, 170-220, OVXL120, HM70 thru HM100, HMSK80-HMSK110 & OHM-OHSK120, OHV12, 7-12 hp engines
    Medium frame engine
    35135A / 35135B / 35135
    / 8692 / 7-01655 P7-01655
    AFTERMARKET $24.95

    Add To Cart


    Add To Cart

    4. Mounted flywheel

    5. Mounted armature & set air gap to .020”

    6. Spark Plug was removed from engine & connected to armature / coil wire & base of plug was held firmly against the engine block. I spun the flywheel by hand & did not see a spark jump the .030” spark plug gap.

    7. Here are my questions:

    1. What is acting as a trigger or switch for this solid state system?
    2. What do I not get spark?


  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029



    2. You have the coil adjusted too far away from the flywheel magnet;


    It's a old myth that rust will cause no spark but it's fact that it will not effect it....

    If you still don't get spark after adjusting to proper specs disconnect the kill switch and check again.

    This is the way I set ALL coils on ALL engines;

    Rotate the flywheel magnet away from the coil. loosen the two mounting screws then pull the coil away from the flywheel and just snug the two screws.

    Rotate the flywheel magnet in front of the coil and insert any business card between the coil and magnet. Loosen the two screws and let the magnet pull the coil to the flywheel, Hold a slight pressure on the coil pushing it against the flywheel then tighten the screws. Rotate the flywheel to remove the business card......
  7. Joni

    Joni LawnSite Member
    Messages: 2

    Lots of useful info in this thread. I'm having a similar problem with my Tec 8hp so thought i should add it here.

    Mine won't start by pulling with full choke/throttle. It seems as though there is no fuel getting to the engine - the spark plug is dry after numerous pulls.
    It has a good spark and the flywheel key is in good condition. I've just rebuilt the carb (although only just read about the check ball problem Rob mentions).

    Anyway I can get it to start and run really well if i put some fuel sraight into the bore, through the spark plug hole. It then starts straight away and runs perfectly.

    So has anybody got any thoughts why i can't get it to start up without putting fuel down the spark plug hole? How can i get fuel to go in there naturally?

    Thanks in advance,

  8. Darryl G

    Darryl G Inactive
    Messages: 9,500

    You guys have it all wrong...you're using the wrong tools. Don't you have a BFH?

  9. Joni

    Joni LawnSite Member
    Messages: 2

    Yes.... What do i hit? :hammerhead:
  10. Patriot Services

    Patriot Services LawnSite Fanatic
    Messages: 14,353

    Tip for cleaning plugged jets and passages. Get a welding torch tip cleaner set. Basically a set of small wires with texture designed for cleaning carbon from small passages. 5 bucks at your tool store.
    Posted via Mobile Device

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