Recommend you get a manual which describes the steps to remove and replace the head. It is not necessary to clean carbon off the top of the pistons but it is important that the top of the block and the matching surface of the head are clean. While you are scraping the top of the block you can keep a vaccum cleaner running working one hand with the vaccum and the other with the scraper so loose material is all sucked up. When done vaccum out each cylinder. Some guys will stuff a rag in the cylinder to keep chips out but either way use the vaccum.
Are you going to get the head checked for cracks. That is usually the machine shop unless you have the equipment. Also need to check that both the block and head have a straight flat suface, not warped.
I usually make a pair of alignment studs by cutting off the tops of a couple of old (straight) bolts. Screw them loose into the block, put on the gasket and carefully lower the head down over the studs. This keeps the new gasket from slipping out of position and everything lined up. Start a couple of head bolts and remove the studs.
The engine can be in any position when you replace the head, may actually be best that you leave it as it was when you removed the head. When you bolt the rocker assembly back on the valve clearance should be pretty near where it was when you took the head off but to be safe you can back off the adjusters a little, then turn the engine slowly by hand and readjust each cylinder at the top of the compression stroke.
Usually you will torque the head once when it is cold and a second time after it has warmed up. Use a accurate torque wrench.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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