Broken headbolt

#1

i was doing a valve job on a geo all was good till i started… tourqen down the headbolts. i broke the last one after doing the three steps in order. Now do i have to replace the head gasket again cuz the head has to come off

#2

If you remove the cylinder head the gasket will have to be replaced again.
While it may not be required, I always coat head gaskets on aluminum head engines with aerosol CopperCoat (both sides). This helps to provide a better seal, fills in any minute pitting that may exist, and helps with heat transfer a little bit.

If it were me, I’d replace all of the head bolts. If one cracked others may not be far behind.
(I don’t know if a Geo uses head bolts of varying lengths but it would be a good idea to verify this and make sure a long bolt is not going into a shallow hole.)

#3

It would be interesting to see if the gasket does fail to seal because it was used twice,the text books say don’t use them twice,I never have,but you can conduct a experiment and try,if you have more time then money.

#4

You should check to see if the bolts are stretch bolts, a one time use item! If so get all new ones next time.