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Originally Posted by Al Hanks
Thanks to all who responded and for the advice. I just bought the car a few months ago and the seller told me that he had just replaced the HG so there could be more issues than he wanted to mess with and that's why he dumped the car. If I pull the head and camshaft like you suggested, how do you adjust the clearance with the cam removed? If there is major damage to the head, do you know of a good source to buy a rebuilt and approximate cost? TIA for your help.
Al
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AHHHHHH, Now.....You just opened another can of worms.
When he did the headgasket did he return all the shims to their correct location or just install them anywhere????? I doubt he knows.
When replacing a headgasket, probably from overheating, its a good idea for a machine shop to check the valves, not only can the headsurface warp but so can the place where the valve seats are located. The valves need to be check for proper seating, then adjusted accordingly.
To adjust the valve clearance properly you need to measure the clearance as they sit (cams installed), when you take it apart you measure the thickness of the shim (Toyota has a mathematical formula for this). Then you replace the shim with a thicker or thinner shim depending on what is needed. With the head off the vehile it is easy to install the cam and re-check the valve clearance until you think you have it correctly.
I have attached a how to check and adjust the valves.
You can try to do it on the car like you wanted, but it might be easier to remove the head and start from scratch, since you dont know what has been done before. Let a machine shop check to make sure all the valves are seating properly or lap them in yourself and check.
Good Luck