Head Bolt Broken

[kachel 5]

While removing the cilinder head i have broken one of the head bolts. The head is of but the broken head bolt is still in the block. It sticks out with 10 cm. Any advice how to remove this?

[DamirGTI 323]

By welding an nut on top of the bolt remains that sticks out .

 

But first i'd leave it for a few days soaked in penetrating fluid (WD-40 isn't good , best i've tried is "home made" - mix up 50% ATF oil with 50% Acetone .. and use syringe to apply the fluid round the bolt , works really good especially when left over night or better still a few days ..) and tapping the bolt with an hammer few times during the day can help break the rust bond .

Clean up the bottom of the bolt thread that sticks out from the block hole as best as you can , with small dremel wire wheel tools or similar ..

 

D

[Tom Fenton 1,524]

Should be able to get it with that much sticking out. Soak it as said. I'd also get some heat into the block around the threaded area. Some stilsons will grip the stud as well as anything. Be prepared that the threads may well be knackered once you have removed it though.

[GLPoomobile 958]

We were discussing on here recently the merits and risks of using the acetone/ATF mix homebrew penetrating fluid. From what I've read since it seems to be quite a well recommended method, but do some reading first to make yourself aware of the risks as it is potent. Plusgas is a decent off the shelf alternative.

 

I also read an interesting tip recently for seized bolts (and watched some videos). The tip is to heat the opposite end of the seized bolt and the dab a candle or crayon to the other end. The heat then draws the wax down the treads. It probably sounds a bit far fetched but I've seen a guy test it on a couple of seriously seized bolts where penetrating fluid hadn't worked, the acetone mix hadn't worked, and regular heating hadn't worked.

[kachel 5]

It worked! Thanks a lot guys. I can go on now. As i have removed the cilinder head should i always let the head be 'shaved' to be sure? There is a '2' stamped on the left of the inlet side of the head and an 'A' stamped on the right side of the inlet side of the head. What does it tell me?

[Tom Fenton 1,524]

Its good practise to skim the head or at very least check it for flatness whilst off. Invariably they will usually need a skim. Whilst its at a machine shop have them check the guides, recut the seats and valves, fit new stem seals and reshim the cam clearances.