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24hp Briggs ESL seems like HIGH compression

Discussion in 'Mechanic and Repair' started by jase4tiff, Sep 25, 2008.

  1. jase4tiff

    jase4tiff LawnSite Member
    Posts: 56

    I have a 24hp Briggs ESL that seems like high compression. If i hit the starter it seems like a weak battery but pull the plugs and it turns fine. I have read some post on this same issue so i checked and rest the valves to .004 and .007 and still isnt getting it. How hard should this engine be to turn over by hand? i know thats a crazy question but i can turn it by hand but of course its a little bit tough. The engine is off the mower so i know its not safteys or anything like that. I hope that i dont have to drop the pan and check the cam to make sure everything there is ok and that mabie i just didnt adjust the valves correct i adjusted them 1/4 past tdc. If any of you guys could help id appriciate it! Thanks
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

  3. topsites

    topsites LawnSite Fanatic
    Posts: 21,653


    I am thinking your engine will be hard to crank so long it isn't on the mower,
    due to the fact there is no flywheel in place, this is perfectly normal.

    I hate to say it but you should install it before testing :p

    If it's brand new, soon as you put gas and oil in it you done voided the
    instant return warranty anyhow, so go on and put it on that machine I say.
  4. jase4tiff

    jase4tiff LawnSite Member
    Posts: 56

    I agree that it needs to be bolted down this engine is not the origional engine i was going to try and replace it with this Briggs 24esl engine i had a Kaw 23 hp with the common top bushing bad that i am repairing and was going to set this engine up on the mower for the time being the mower is a John Deere 657 quick trac. The numbers off the briggs engine is 24 ESL 725 and family number is YESX57242VF275363. Thanks for your help. I will work on mounting the engine for proper testing this is a used Briggs engine that came off a cub cadet.
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    OK, The numbers you posted are not the ones I was looking for, The model type and code numbers are stamped in the top of one of the valve covers.

    But, I really don't need them now.

    I believe your problem is the valve adjustment. Rotate each piston to TDC compression stroke and adjust the valves at that position to .005 both intake and exhaust.

    That's right, These V-twins are adjusted at TDC.....

    Good Luck
  6. pugs

    pugs LawnSite Gold Member
    Posts: 3,022

    Why would the flywheel not be in place? You dont need the engine to be mounted to anything for the starter to spin it.
  7. jase4tiff

    jase4tiff LawnSite Member
    Posts: 56

    Yea i didnt get that one either but for now i did bolt it down and i adjusted the valves to .004 and i took one plug out and hit the starter. When it hits compression it stops i do belive that valves can be an issue but i have them close and this engine should at least give me a full revolution atleast. So it makes me think that its the cam or the compression release system. If i pull the pan can someone tell me what the compression release system looks like on this engine or what it supposed to look like? Does it have a arm that swings out or is it a lobe on the cam or what. Thanks guys for your help!
  8. jkilov

    jkilov LawnSite Bronze Member
    from MS
    Posts: 1,415

    Is the compression release working ?
  9. jase4tiff

    jase4tiff LawnSite Member
    Posts: 56

    I am not really sure if its working i have watched both valves and cant really see a "bump" where it releases the compression unless its so small of a bump i am missing it..>??
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    The release if working properly will show a distinct movement in the intake rocker arm. As the piston travels up the cylinder you will see the rocker arm moving up (toward you), The rocker will stop for a second then should move back down (away from you) enough to be easily seen then travel back up toward you.

    The compression release is a spring loaded arm mounted on the cam gear.

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