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Was given a gravely

861 Views 6 Replies 3 Participants Last post by  nhgravely
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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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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