The Big Fix: Watch This Welder Perform A Repair On A Massive Lanz Bulldog Piston


The Big Fix: Watch This Welder Perform A Repair On A Massive Lanz Bulldog Piston

Ok, now this is neat. You are about to watch a welder perform a piston repair on a massive Lanz Bulldog piston. So a Lanz Bulldog is a tugboat engine? No. A locomotive engine? Negatory. How about a single cylinder, two stroke, hot bulb, 6.3L engine that made 12 horsepower in a little tractor called a Lanz Bulldog. Fear not, though. By the time they were done making the tractors the engine was more than 10L, still single cylinder, and 55hp. Just on looks alone, we’re guessing that this is one of the 10L slugs. Look at the size of that monster! Imagine what it weighs and what the rest of the rotating assembly looks like to hang onto it.

The problem here is that there is a big crack or fissure on the dome of the piston and this guy has been tasked with fixing it. With the tools you’d expect he attacks the issue and literally digs deep and then begins the process of fixing it. The repair looks good and we’re guessing that there are many trouble free years of operation for the Lanz engine that’s getting rebuilt.

This is a cool watch and one freaky big piston!

Press play below to see a fabricator repair a piston from a Lanz Bulldog tractor –


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7 thoughts on “The Big Fix: Watch This Welder Perform A Repair On A Massive Lanz Bulldog Piston

  1. bob

    That\’s nothing, I remember someone back about mid 80\’s who bought an updated 82 or 83 Pro Stock chassie and dropped a chunk of cash with Reher/mors for just custom pistons, intake, and heads, less valves and springs. Then went out and burned holes in I believe it was 2 pistons. Then welded the pistons and put the engine back together and ran it for a good while like that.

    1. jason delanoy

      ive welded,and stopdrilled many a piston its NOTHING new all the old school brittish cafe racers did it all the time!

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