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i talked to the toyota dealership and they told me that the head bolts were ok to re-use but from my understanding, they are torque to yield bolts and cant be re-used.
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Well, i would try the easiest things first, naturally - step 1 for me would be, buy new head bolts and replace them, one at a time, with the head still on the car. And maybe this might seal the leak, worth a try anyway before ripping off the head all over again.
There are some things to keep in mind when replacing head bolts, chances are you know them already but here goes.
When changing head bolts there are several important things that should/must be done.
1. The head bolts must be clean and unstretched.
2. The threads are lubricated with a few drops of engine oil.
3. The thread holes should be blown out and cleaned with a brush.
4. The head bolts should be installed in steps and in a sequence - that is, do not tighten a head bolt down to final torque, all at one step!
First all the bolts are tightened to 1/3 of their final torque. Then you start over and tighten them to 2/3 and then to final torque.
5. Most important, use the recommended tightening sequence (image).
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am wondering if the head gasket is somehow blocking a coolant passage and causing excessive pressure in the coolant flow and causing the pump to leak.
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My guess is no; this would only have happened if you put the head gasket on upside down (and it's hard to miss the word "TOP" printed on the head gasket in large letters). Or else if you had somehow installed the WRONG head gasket.
So if you still have the packaging for the head gasket you could double check the parts number, to make sure you installed the right one.