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Eastern Ontario | Be sure to have the head magnafluxed or pressure tested and have it planed in case it cracked. Also make sure all valves have proper protrusion from the head when it's off, should stick out .030-.040". It will cost some money, but it's the only way to be sure you'll get a good seal. Sounds like it got a good shot of ether, ether that or the fuel was a little strong. When the head is off be sure to check that the sleeves protrude from the block .002-.006" (off the top of my head). The new bolts should have instructions for torque sequence and spec, some say to go 120 then 140ft-lb HOT. You should dip the bolts in clean new SAE30wt oil before installing. You will see some oil seep around the head once it runs a bit, but it goes away. Other than that, clean the top of the block as best you can, if the gasket blew between cylinders make sure it didn't leave a mark on the sleeves or block. If he's even thinking of putting sleeves and pistons in the motor, this would be a good time to do it. Any machine shop worth dealing with or your john deere dealer should be able to get you instructions and specs, if not, go somewhere else. As for the valves, the owners manual should have the spec, .018intake and .028 exhaust i think. I really think torquing hot is a good idea, things will flex and seal up better than when they're cold, but you MUST remember to reset the valves AFTER the head is torqued, as they will be tighter than before. I've done 5 in the last 18mos and no leaks yet. Good luck!! | |
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4450 broken head bolt
