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Briggs and stratton classic engine

elliesgrampselliesgramps Posts: 35
in Problem solving

Hi all

After replacing the rings on my BS engine I noticed odd valve movement. on investigation I found that a part under the cam was catching the exhaust valve tappet enough to allow gas to escape. has anyone got any idea what role this part plays please. I would show a photo if I can work out how to add image

Last edited: 04 December 2016 21:32:20

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  • ObelixxObelixx Posts: 30,088

    No idea but for photos, use the camera icon on the top right of the reply box.

    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • elliesgrampselliesgramps Posts: 35

    HI 

    I tried that. found the photo selected it but it hasn't appeared in the thread.?

  • nutcutletnutcutlet Posts: 27,445

    Make the photo smaller, I reduce mine to 30%. If they're too big (and too big isn't very big) they just don't load but you don't get a clue why not



    In the sticks near Peterborough
  • ClaringtonClarington Posts: 4,949

    Pop a photo up and I'll let you know.

  • elliesgrampselliesgramps Posts: 35

    image

    At last Ive got pic on. this is the part I mentioned on the cam when the piston is between intake stroke and going towards tdc on the compression stroke. the little knib on this item (nearest my finger) catches the tappet enough to slightly lift the exhaust valve to release some of the pressured gas before ignition. I've no idea what this item does. so any help would be great.

  • ClaringtonClarington Posts: 4,949

    Elliesgramps: Most strange! 

    Does it look like it should be there. Because there really shouldn't be anything striking proud of the cam shaft so I am wondering whether it has picked up a piece of metal that has come loose from elsewhere which is causing your problem. Is it attached to the black circlip holding the pin in place?

  • elliesgrampselliesgramps Posts: 35

    Yes it's designed to be there as it's held in place by a pin through cam main rod and held up one end by a sprung piece of wire. all briggs classic engine cams have the same but I'm confused as to its purpose.

  • ColinAColinA Posts: 392

    The part shown is a decompressor to lower the compression for easier starting when pulling the engine over

    Colin A

  • MuddyForkMuddyFork Posts: 435

    Have you looked at Briggs and Stratton website.  They may explain it

  • nutcutletnutcutlet Posts: 27,445

    I think ColinA has explained it.image

    I'm no engine expert but I used to ride a big single cylinder motorcycle image



    In the sticks near Peterborough
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