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Old 01-10-2010, 12:07 PM
How fast is fast enough?
 
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cracked

i have a head with a crack in the deck surface through a head bolt hole, can this be ran, can it be easily fixed?

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Old 01-10-2010, 01:27 PM
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How much is the head worth to you? Anything can be repaired for a price, in general unless its unique or impossible to replace I would say forget it...doing the repair properly is time consuming and expensive unless you do it yourself.

The technique for repair I have used successfully in the past is to construct an oven out of firebrick filled with charcoal, 12-20 bags is usually sufficient to get it hot and anneal it after the welding. Once the heads are good and hot (dull red) you weld the ground out crack with ductile cast iron SMAW rod and then peen extensively and recover the head with coals and seal up the oven with another layer of coals on top and a layer of firebrick to seal. Remove the head for machining once it cools which may take a couple of days. Its a good idea to keep the head in the oven as you weld and even have a rosebud torch to keep the weld area hot while you run the beads. Don't be surprised if the head cracks in other areas that you don't know about if you haven't had it magnafluxed first, I would consider having the head magnafluxed first before proceeding to ensure your not wasting your time with a no win situation.

I have a 100% success rate with this method, they don't crack after.
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Old 01-10-2010, 01:57 PM
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I think 4 jaw is right on the welding part. If you don't have the proper equiptment and have to take it to a machine shop and it is a pretty common head I would suggest that you pitch that one get another out of the salvage yard and take the money that you were going to weld the head to plane and refurbish a different one. Just my idea.
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Old 01-10-2010, 02:28 PM
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how far out is the crack. i have used some lock n stitch pins and also core drilled the bolt hole out and unstalled a guide in them before.
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Old 01-10-2010, 02:58 PM
How fast is fast enough?
 
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eh. time to scrap it. may donate it to my machinist if he wants to cut it up.
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