12-01-12, 02:45 PM
Well to be honest, penetrating fluid will do fuck all as there is a gas tight seal there unless they are slightly loost.
Undoing them won't strip the threads in the head unless they were damaged putting them in. It's the torque on the sealing washer that's holding them.
Do it hot as the head will expand a little.
Try doing it up a very small amount and then undoing although this should not striclty be necessary.It looks as if a monkey put them in. Only usual way of stripping head threads is by over tightening.
Get a good fitting socket on them though to prevent slippage. Use a bit more force, you'll be fine.
Undoing them won't strip the threads in the head unless they were damaged putting them in. It's the torque on the sealing washer that's holding them.
Do it hot as the head will expand a little.
Try doing it up a very small amount and then undoing although this should not striclty be necessary.It looks as if a monkey put them in. Only usual way of stripping head threads is by over tightening.
Get a good fitting socket on them though to prevent slippage. Use a bit more force, you'll be fine.