18 replies to this topic

[mikebramel]

I would do a thread insert before you put the money into a head

[Bolens 1000]

What engine was this on?

[Bruce Dorsi]

As mentioned, thread inserts are good. .......Depending on the engine, another option is to ream & tap the hole for an 18mm plug.

Of course, if it is a Wisconsin engine already using the 18mm plug, the insert is the way to go. .....If you do buy a new head, save the old one which can be repaired for future use.

[mikebramel]

I think this is for a K twin?

[KIRO-1]

Try heating it to expand the thread hole a little. Some times even a good 1300watt hair dryer will warm it just enough. Once it's good and warm I try tightening it first then quickly reverse the ratchet to loosen.

[NUTNDUN]

Have you tried using pliers so you can pull up on the bolt while loosening it? Another thing you can do is to get a flathead screwdriver under it to help keep tension on it while backing it out.

[Alc]

Sometimes on stubborn bolts I'll use a brass punch and give it a few hits with a hammer to shock the head , then try loosening it. Just another thing to try , Al

[LPBolens]

So the saga continues, but at least you now got fire. I have a K532 that I am working on now. The PO managed to snap the rear headbolt on the left head. So far I have had no luck in getting the stub out of the block, even though I have tried every trick I know of, including welding a nut to the stub, and heating the block at the bolt boss. Drilling it out is next.

[Alc]

LPBolens ,Sorry to hear that your having to drill out the bolt . I'm not one of those guys that can drill a bolt out without damaging the internal threads . I use a screw extractor that has a drill guide bushing if I can even if it's just to make a hole right in the center . I'm guessing you would have to cut the bolt flush and install the head to use the guide bushing , Al

OTC 4651 Screw Extractor Set | SJDiscounttools.com

[mikebramel]

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