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Discussion Starter #1
Was given a model li with a sickle bar mower attachment Serial number m20303 Man number A-3707
Was wondering what Year it is and what common things should be looked at etc... Seems to run well.... however heres the kicker. The exhaust flange was cracked and leaking really bad but after further investigation I found that the exhaust flange on the head or jug where the exhaust and gasket meet has corroded away and seems someone has already brazed a stud in at some point which also broke... I’m kinda assuming I’m looking at locating a new “jug” Any thoughts and insight would be great. I’ve been a car mechanic for the past 15 years so I’m not afraid to work on it and frankly it just seems like with would be enjoyable to work on. Thanks everyone
 

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It looks like it's a 1957. It also sounds like a "new" jug is likely in your future.
I inherited my 1956 LI years ago. It was a smoker at the time. Took the jug off and to a local machine shop. Anyway new bore, new piston and rings, a little lapping of valves, and it runs fantatic! Mine is electric start, but the chain broke last fall. At the time I was miles from home but I did get it started with a pull on a improvised ratchet strap. Anyway it always starts on first pull so I haven't even put the new starter chain on. Just made a real original style pull strap.
With a little work yours should be a strong running machine too! Especially with your mechanical background. Good luck and have fun!
 

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Forgot to say that there are several jugs listed on eBay. Even some new old stock (read big $) but depends on what you want to do. Again Good Luck with it!
 

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Discussion Starter #4
What would the engine name or designation be? And if getting a used jug...beside wanting to clean it up and have it machined is it possible to just install as is if it is the same motor?
 

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I assume yours is a 6.6hp given the year. The spark plug is leaning (electrode end towards the carburator) correct? If so-That's all you really need. It should bolt right up.
There were some valve changes at certain years I guess, but if you get something for a 6.6 gravely engine I believe youll be ok.
Possibly someone could chime in here in that.
Or call Richards Lawn and Garden (304-927-4580 or 800-827-4551) and ask. Good people and know all things gravely. I know they have used jugs too. Not sure on the price vs ebay though.
 

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Discussion Starter #6
Thanks a lot guys I appreciate the help. It's been a while since I've been active on any type of forum and forget how helpful people are
 

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Either the 6.6 or the 7.6 jugs should fit on your tractor. Assume you have the two piece valve boxes; a cast iron bottom with an aluminum top w/ door to adjust the valve lifter. Just get or assemble a jug with the upper plates under the valve springs and install on your engine.

If possible, I would use a 7.6 jug as its top flange is much heavier than the older 6.6 and it won't strip out the head bolt holes as easy or break off a corner of the flange (have one of those). Also, I used studs in the last one I assembled to more evenly load the CI head and head gasket.

Did want to try and machine and tap the exhaust port for a 1" NPT pipe to repair the broken flanges but not sure if the overheated iron will take a tap and cut the threads correctly. There was a thread on here somewhere about fixing ports, I just don't remember which one.

Good luck
 
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