Need a little help guys....!Motor going up?

Discussion in 'Mechanic and Repair' started by MoGreen, Aug 23, 2007.

  1. MoGreen

    MoGreen LawnSite Member
    Posts: 88

    Bought a Bobcat Leo w/ 17.5 B&S about a year ago. It's the ELS 500 motor model#31L777-0110E1. It's VERY hard to turn over past the compression stroke, and has burned up 3 starters because of this. Less than 200 hrs on it, and been to the dealer many times. Called B&S and had the cam and compression relief valve replaced, but didn't fix the problem. (Evidentally, there was a service bulletin out for this) They "fixed" it for free....but it didn't help. I'm thinking of just buying a new motor out of pocket....
    IF I do, what should I be looking for? Does the wiring harness of the new motor plug right up? I doubt it!
    Here's the specifics: 3-5/32", 1/4" keyway, 7/16-20, 1" diameter shaft, keyway, alternator is 9amp I think....does it matter what amp it is?
    I do not know what all of these mean, and all I could find were the specs for the 31L777-0036 motor which I guess is the newer replacement of my current motor. I guess it became obsolete? The mower is about 3-4 years old.
    I assume I have to replace it with a B&S because of the bolt pattern on the mower?
    I have been looking at the Vanguard 18hp.
    I really would appreciate any help. I plan on spending around $1000-$1500 total. I can install it myself-I have basic knowledge and it seems pretty easy.
    Thanks a lot!!!!
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    My question is;

    Did they adjust the valves properly ?

    On this engine the piston should be positioned at 1/4" past top dead center compression stroke before adjustment otherwise the compression release will not function properly.
     
  3. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    Ditto what rob said. PROPER valve adjustment is crucial! It may also save you the cost of an engine.
    You can use something like a wooded pencil for a depth gauge. Get the piston TDC and mark the pencil at the spark plug threads. Make another mark 1/4" "out" from that on the pencil. Slowly rotate the engine so the piston goes down and the second mark on the pencil aligns.

    31L777-0110-E1
    31L777-0036
    Go to the link and download the IPL for your engine!
    You'll see the 0110 type uses a different crankshaft than what is "normally" used for that engine. ERGO, it won't work. The IPL doesn't list HOW it's different, but it's probably length and/or diameter.
    As for alternator- both these engines use the same alternator, but since the crank is different.....Worst case on an engine swap is you can just swap the charging systems- flywheel, stator..

    http://shop.briggsandstratton.com/B...ATALOGID=56B2B9A7-283C-11D4-8886-00B0D0203414
     
  4. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

  5. MoGreen

    MoGreen LawnSite Member
    Posts: 88

    As usual, excellent responses, and lots of juicy info-just what I wanted!!
    Shot an e-mail to B&S Corp. and just got the response back. Got a phone call at work from the B&S District rep and he assured me it would be taken care of. Brand new motor!!!
    He said to take it to my dealer, and B&S would take the loss to make this customer satisfied!! Hats off! I am soo happy! How long should a break in be required before changing over to synthetic?
    Thanks again!!!!!
     
  6. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    "How long should a break in be required before changing over to synthetic?"

    You couldn't leave well enough alone!:)
     
  7. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    At least 50 hours.
    The squeeky wheel gets the grease. I put some squeeks toward Kohler and they replaced my 25 Command with a Command Pro and it's still running strong after 6 years. The first one started having problems at about 75 hours. This is how these large companies should treat the consumer. I would not hesitate to purchase a Kohler engine.
     
  8. MoGreen

    MoGreen LawnSite Member
    Posts: 88

    Yup, I have never had B&S as my favorite, but never really had a reason to dislike them either. My friend owns a HUGE local company (Parsons) and he said B&S has never let them down yet. If he has a problem, they take care of it-simple as that.
    This experience has certainly instilled my trust in the product. They backed it up!! I am soo happy.
     

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