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  1. #1

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    5.0 horsepower briggs and stratton makes a loud knocking sound

    My mtd 22" cut makes a loud knocking sound when I put the engine under strain(cutting high grass)it shouldn't be a rod knock because I just Bought it 2 years ago and I have always changed the oil in it with pennzoil SAE 10W-30 platinum synthetic ( high quality oil) the blade is not loose so I have no clue what it is. It sounds like someone beating on metal with a hammer really fast. To be honest it sounds like a rod knock but I just wanted to see what y'all had to say :)

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  3. #2

    Join Date
    Apr 2012
    Posts
    548
    Location
    Texas
    Mower
    Troy-Bilt Super Bronco

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Sometimes the blade adapter (if equipped) cracks and will knock even though the bolt is tight. If your mower has a blade adapter, disconnect the spark plug wire, tip the mower with the carburetor up, remove the blade & adapter and inspect carefully. Replace parts as necessary. Also, check the engine mounting bolts for proper torque. Hopefully for you, one of these tips will fix your mower.

  4. #3

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Quote Originally Posted by Lawnranger View Post
    Sometimes the blade adapter (if equipped) cracks and will knock even though the bolt is tight. If your mower has a blade adapter, disconnect the spark plug wire, tip the mower with the carburetor up, remove the blade & adapter and inspect carefully. Replace parts as necessary. Also, check the engine mounting bolts for proper torque. Hopefully for you, one of these tips will fix your mower.
    Thanks a lot for the tips. I will try it and get back on here with the results

  5. #4

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Ok I checks all of that and its all good, still knocks.

  6. #5

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Ok I check all of that and still knocks :(

  7. #6

    Join Date
    Apr 2012
    Posts
    548
    Location
    Texas
    Mower
    Troy-Bilt Super Bronco

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Sounds like it's time to open the engine and find out where the excess clearance is. Rod to crank or wrist pin to piston/rod perhaps? Something else coming apart in the engine? Without the ability to hear the knock it's difficult to diagnose through email.

  8. #7

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    This is something that might help you lawnranger, when its. Cold, and I first start it, it knocks six times, it starts, and knocks 6 times. Not five or seven...six. its weird

  9. #8

    Join Date
    Apr 2012
    Posts
    548
    Location
    Texas
    Mower
    Troy-Bilt Super Bronco

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Quote Originally Posted by chevyman984 View Post
    This is something that might help you lawnranger, when its. Cold, and I first start it, it knocks six times, it starts, and knocks 6 times. Not five or seven...six. its weird
    Live with it or tear into it.

  10. #9

    Join Date
    Jun 2012
    Posts
    37
    Location
    Virginia
    Mower
    John Deere

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Well then! I was just telling you!

  11. #10

    Join Date
    Apr 2012
    Posts
    548
    Location
    Texas
    Mower
    Troy-Bilt Super Bronco

    Re: 5.0 horsepower briggs and stratton makes a loud knocking sound

    Quote Originally Posted by chevyman984 View Post
    Well then! I was just telling you!
    I appreciate you telling me. No offense meant, I was just saying that from here you have two choices and I guess I didn't choose the best way of saying it. Sometimes I use the least amount of words to express my meaning and it can be taken the wrong way. I'll rephrase what I meant: Since the blade, blade adapter and engine mounting bolts are all in proper order you can use the mower as it is and see how long it will last or you can disassemble the engine to look for the possible cause. I've not heard of something causing a knock other than a loose blade/adapter, loose engine mounting bolts or excessive clearance in the connecting rod to crank or wrist pin to rod/piston. I'm not saying that there isn't or couldn't be another possible cause, just that I haven't heard of anything other than the items I mentioned. I'd sure like to be aware of another reason for a knocking sound such as you describe if there is another reason. Please post the cause if/when you find it as we all can learn from this situation.

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