SOURCE: Need to know roughly how long it would take to
Depends on your level of experience, quality of your tools and whether or not you have any frozen head bolts. The valve assembly and head come off as one unit on those. To clear the wires, emmision controls ect off of the top of the valve cover 30 minutes. remove valve cover 5 minutes (too scrape off excess gasket material. to remove exhaust manifold from side of head, (assuming no broken/stuck/stripped bolts 15 minutes with good hydraulic tools. To remove head (assuming all goes well and hydraulic tools, 15 minutes. To reassemble, double all times as surfaces need to be prepped and gaskets applied and proper torque on all bolts. It's an afternoon job if you ahve everything you need and nothing goes wrong. Typically add at least two or three hours of drilling and cursing to a head gasket replacement. and a trip for new drill bits and a tap (not beer) for the new hole you drilled.
SOURCE: replacing thermostat on 3100 sfi v6
1. drain coolant from radiator
2. unbolt and remove the water neck from the engine block (it's attached to the upper radiator hose) and scrape any leftover gasket material off of the mating surface w/ a razor or gasket scraper, being careful not to actually gouge the metal
3. pull thermostat out of engine block (it's easy to see w/ the water neck off)
4. scrape any gasket material off mating surface on engine side, being even more careful not to gouge the metal here
5. place new t-stat on engine side opening
6. place gasket over the thermostat (you can put a thin bead of RTV sealant on both sides of the gasket if you wish, some people think it's overkill, but i hate doing things twice)
7. replace water neck
8. refill cooling system, use the little brass bleeder screw on top of the motor to bleed out the air until a steady stream of coolant is coming out after the engine is warmed up. close the screw.
SOURCE: pic's on the location of the coolant temp sensor
Top left side of the engine, below the throttle body
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