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#1
10-15-2015, 10:24 AM
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Mag 18
I'm going to need to do some work on my mag 18 and have a few questions since I've never had a twin before. The head gaskets are both leaking so I'm going to replace them but I need to know if I can true the heads with sand paper on glass without having a valve clearance issue? Since the heads will be trued by hand do I need to worry about one cylinder having more compression than the other? Since I can't get to the head bolts with the tins on I will need to run it with them off so I can retorque after it cools, should I put it through 4 or 5 heat cycles and check torque after each to make sure I won't have an issue once the tins are on? I know some of these might be stupid questions but I wanna get it right the first time so I can enjoy my first twin instead of wishing I'd never bought it. Thanks
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Tim Pap's 100 Restored 108 1211 Dual Stick 1050 Pap's 100 restoration thread - http://onlycubcadets.net/forum/showthread.php?t=47965 
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#2
10-15-2015, 11:50 AM
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No problem with valve clearance, you can usually mill .040 off them and still have no problem.
You will only be taking off maybe .0005, if that. On the gaskets: after you torque them, run it till it is up to operating temp. You can put the tins on with just a couple of screws, and run it @ full throttle with no load till it is hot,- guessing 5-10 min. Then let it cool, re torque and you should be ok. I only heat cycle it once, you can try 2x and see if they loosen any more, I doubt it. Do use the gaskets with the "fire ring" I have had success with ebay gaskets ( prolly Stens) if they have the crimped-over inner edge ( fire ring)
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#3
10-16-2015, 10:13 PM
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thanks for the info, now i just need to order my gaskets.
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Tim Pap's 100 Restored 108 1211 Dual Stick 1050 Pap's 100 restoration thread - http://onlycubcadets.net/forum/showthread.php?t=47965
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#4
10-16-2015, 11:17 PM
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Tim,
I agree with all the info that George gave above.. I have never had an issue with the bolts loosening up. For sure use the gaskets with the fire ring.. Some people don't like the old opposed twins but I have had really good luck with several of them.. Properly tuned and maintained they have a lot of torque and make smooth power. I have a Magnum 18 in a Gravely with 1500 hrs on it.. other than oil changes and one valve adjustment it's never been touched. I think you will like it! 
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Jay 40 years of Using and playing with IH Cub Cadets! Proud owner of the following: Cub Farmall, Super A Farmall, Original, (2)70's, 72, 100, 102, 123, 105, 125, 127, 108, 128, 1450, (3)782's, Yellow 982, 1782, "Sam's" 2182, M Farmall and a #7 trailer
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#5
10-17-2015, 12:24 PM
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All good advice although I wouldn't run it at WOT without a load on the engine. I'd do half to 3/4 throttle or just drive it around for a bit. All you're trying to do is heat the engine up, nothing fancy about that
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-Ryan
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