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and on that thought of starting fluid when that stuff lit off to do that damage who knows what pressure the head bolts saw. if that is what happened. did you look at the crank bearing surfaces yet?
looking good, I am sure you got this one figured out. one advantage to these tractors is they are simple. a little ruff machined and assembled too.
the spring might have been put in a hose to keep it from collapsing in a bend , I have seen it used in cars hoses from the factory but it should fit snuggly. If you do not have a pressure washer maybe take the radiator out and to a car wash for blowing out the junk.
If you decide to try too reseal with a liquid liner the fuel tank, I have done with good results a product called Red Kote I think? anyway when you get one tractor to move strap the rusty fuel tank to the center of the rear wheel of the tractor with nuts bolts rocks whatever and go for a 1hr low speed ride that stuff will work on any loose rust and get the inside ready to seal, although further cleaning of the residue will be necessary, just a fyi might want to use hearing protection too. you can not believe how noisy it can be.
let me state this, blow by is not terminal as a blow up , you can run this engine and we just can not say how long ( before blow by reduces compression till it will not run), it might even improve if it needs running hard to seat rings , this engine is of low hours. I have seen engine that were so worn the had to be started with starting fluid but once going would still work all day. I would not be in a hurry to do a teardown get some hours on it and reevaluate . Also buying a complete engine might be the way to go you will have a spare parts engine then unless a core is required which I doubt.
still a compression check would be your best move, it should not make any difference but engine oil for these is 15/40. how many hours are on the machine? You never know maybe it was not broke in properly , just thinking of this take a compression reading then run it hard within reason for 5hrs or so , make sure it gets to a good operating temp. 80 c or 180 f let cool off and take another reading and see if the rings seated any better. also check the oil in the injection pump, that gets over looked often. good luck
makes you wonder why they did that once in place where is it gonna go? just need enough tension to make the bearing spin in place.
