seized water pump bolt

the last bolt on my waterpump has seized solid, the grippers just keep chewing the head, is it safe to heat it and is there another way of getting it off, have been spraying it with a penetrater every couple of hours all day yesterday and not made a difference, any help would be appreciated.
thanks jamie

heat
or grind head off, remove pump then attack it again.
or weld a nut on the outside.
with judicious use of wd40.

unfortunatly i havnt got a welder and am taking the pump off to replace a snapped cambelt so cant drive it anywhere. if heat doesnt work i will have to grind it and hope i can get the remainder out.

If you can get the head off the bolt so that you can remove the water pump you could then apply heat around the 'block' (gently) this may help free the bolts off.

If not then they are likely to break off flush with the 'block' and then it is a drill and tap job.

Copper ease on the replacement bolts will reduce the likely-hood of this happening again.

ok, several people have said heat the block and several said heat the bolt, whats the best or shal i try both, im on a realy tight budget and and cant afford a mistake, tryd a cold chisel and a 4lb hammer and still didtn move just cuts into it.

Did this on my mates Defender, used copious amounts of heat on bolt and block, but I used the metrinch spanners, I think Halfrauds do them, the type that grab the sides of the nut / bolt head instead of the corners.
Well worth the investment in a single socket of correct size and saves rounding off or chewing the head

Whichever method of heat (both will work!!) tighten the bolt up slightly first .. this is often enough on it's own to break the bond that holds it in.

My favourite method is to use an old fashioned Impact driver, the manual 'it wiv' an 'ammer sort .. Impact Driver .. one good blow to tighten, then a couple of good blows to un-tighten. Works maybe 90+% of the time. Make sure you use a decent impact grade socket.

andyb66 said:

If you can get the head off the bolt so that you can remove the water pump you could then apply heat around the 'block' (gently) this may help free the bolts off.

If not then they are likely to break off flush with the 'block' and then it is a drill and tap job.

Copper ease on the replacement bolts will reduce the likely-hood of this happening again.

Click to expand...

I've done this, same prob! The heads snapped off the bolt, not snapped at the block end, if I undo the rest of the bolts should it in theory with a bit of convincing slide off?

I had this problem with a couple of bolts. Heads snapped off, managed to get cover off then attacked them with heat and hammer etc and the snapped again so had to drill them out and retap. Screwed some threaded rod in and cut to length.

Some pics of my problems here

http://www.landyzone.co.uk/lz/f48/cambelt-not-much-progress-but-getting-there-99841.html