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Valve seat halfway out...

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Oscar123
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2019/08/16 08:42:47 (permalink)
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Valve seat halfway out...

Engine had no compression. Tore down and found one valve seat halfway out. After cleaning up as best I can should I try to drive it back in? Or is repair hopeless? Thanks for your thoughts.

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    Roy
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    Re: Valve seat halfway out... 2019/08/16 11:36:15 (permalink)
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    Those seats are way too deep in the block, somebody has done a shoddy repair. The block is toast.
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    Oscar123
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    Re: Valve seat halfway out... 2019/08/16 19:30:59 (permalink)
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    Thanks for the reply, Roy.
     
    I don't know the history of the engine, so you may be right about it having been previously repaired. One thing I found during the tear down was one of the connecting rod cap screws was only hand tight/not torqued. Another sign of bad work.
     
    My son did get 3.5 years of mowing with this engine/mower. He probably could have gotten more if he had cleaned the air filter and not overheated it to the point that the seat popped out. No one will ever know now. :)
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    Oscar123
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    Re: Valve seat halfway out... 2019/09/10 22:26:39 (permalink)
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    Follow-up: Applied a very small amount of Seal Lock under the seat using a fine paint brush, and then drove the seat in as best I could (appropriately sized socket). Then I applied a very small bead of Seal Lock around the top, most of which was sucked in by capillary action. Wiped off the excess. Then I carefully staked it the way the B&S repair manual shows for heads with removable seats. Lapped and reassembled.

    Engine started. Ran it for an hour no-load so I am pretty hopeful I will get more use out of it.
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