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#1
07-24-2025, 09:00 PM
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B&S Vanguard 49T777 sleeve relacement?
I have a Briggs & Stratton 49T777 ~26HP V twin Vanguard that tossed a rod into the casing & busted the bottom of the #2 cylinder bore. The casing is cast aluminum and the sleeve is cast iron, I believe. I've read on other forums that the sleeves are molded in..implying there's no removing/replacing them.
I'd like to know from the experienced if the sleeves can be removed and replaced. I'm aware that boring the sleeves out may be an option but I don't know what the cost would be..guessing too much. IF the sleeves can be replaced then I'm inclined to try that. I can TIG weld or J.B. Weld the puncture in the casing, easily enough. Anyone? Photos: https://photos.app.goo.gl/MQgXhHkqyryqjcMi7 
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#2
07-24-2025, 10:40 PM
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I would think there no way to sleeve that with the sleeves cast in, nor would I want to with the kind of catastrophic damage.
Time you tig that hole with a patch you are going to induce a lot of heat in that casting, if it was sleeve able. And JB epoxy it not meant to be used in that situation. It would be prolly be more economical to find another engine. You make no mention of what it came out of. but if a lawnmower, you might find a doner. It just ain't practical to pour $$ in a junk block, would be my thinking. 
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#3
07-26-2025, 10:36 AM
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Thanks for the response. I'm inclined to agree with you on all points.
I sent a message & photos to L.A. Sleeve & they replied promptly saying they had put new sleeves in a Vanguard block but not often enough to make notes about the process or what sleeve to use or make. The reply made it seem like a custom job, and they had to bore out the old sleeve in order to make a new sleeve fit. I didn't ask about the cost. They also confirmed that the factory sleeves are molded into the alumium during the casting process, so there's no pressing the original sleeves out. I'll probably buy an engine for the machine, a Husqvarna MZT52.
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#4
07-26-2025, 04:28 PM
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Yes the entire sleeve has to be bored out, incurring those charges, then
all the new parts that you have to purchase to put in it to do it properly. Your looking at 75% of the cost of a new engine, Also the heat transfer of the sleeve to the bored hole isn't 100% so its going to run hotter on that cylinder.
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