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05-16-2019, 07:36 PM | #1 |
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Repair of Police (B) Head..
I have two of them, Both cracked in the combustion chambers.. Are they worth trying to fix ? if so how ?. Been told by one shop that they have not had much luck trying on other heads..
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05-16-2019, 10:16 PM | #2 |
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Join Date: May 2010
Location: Auburn Washington
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Re: Repair of Police (B) Head..
I have two of the same, and one I have over $300 in it trying to save it and they are just a conversation piece,
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05-16-2019, 10:28 PM | #3 |
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Re: Repair of Police (B) Head..
They can be torch welded.
I wouldn't trust any other method. |
05-17-2019, 09:30 AM | #4 | |
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Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
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Re: Repair of Police (B) Head..
Quote:
http://www.jandm-machine.com/metalStitching.html |
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05-17-2019, 12:23 PM | #5 |
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Location: Anchorage, Alaska
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Re: Repair of Police (B) Head..
I have one as well. It's cracked in the thin water jacket (it froze with only water in the engine, no antifreeze.) It was that way when I got the pickup. Right now it's yard art!
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05-17-2019, 11:11 PM | #6 |
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Re: Repair of Police (B) Head..
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Thank you Brian |
05-18-2019, 01:16 AM | #7 |
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Re: Repair of Police (B) Head..
Depending where the cracks are they can be drilled & pinned.
It's what I've done on heads anyone else would throw away. The lock & stitch things are pretty good.
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05-18-2019, 01:57 AM | #8 |
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Re: Repair of Police (B) Head..
You said the cracks were in the combustion chamber.
Stitching has a VERY poor chance of working there. Anywhere else on the head stitching would be ok. |
05-18-2019, 07:49 AM | #9 |
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Re: Repair of Police (B) Head..
And given the price of stitching, or even welding - it may be more cost effective (and more certain) to simply buy an aftermarket high compression head.
I am reminded of welding an aluminum skylight frame. 1/8 section at four corners and a filler piece along the short side. $450 was the quote locally. "I get minimum $125 an hour for welding aluminum." Welding CAN be expensive. Maybe especially so when you're talking pre-heat, inter-pass peining, and post weld heat treatment. All possibly "chargeable time." Even the weld materials. Eutectic brand cast iron rod runs $125 a pound - back in the 1990s. So I bought the kit for my MIG and learned how to do it myself. But I had the luxury of time, a MIG, and could invest $100 in the conversion kit for the MIG and $125 for the full Argon bottle as a sort of gamble. Fortunately on this one I won! Joe K
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05-18-2019, 09:37 AM | #10 | |
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Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
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Re: Repair of Police (B) Head..
Quote:
Because stitching doesn't work? Actually stitching is the best means to repair old cast iron. Example shown of somone trying to braze the crack only made it worse. We in turn cut out damaged area and made pieces fit them and then stitched them back in. This was years ago. This head was attempted to be repaired and did more damage by adding heat to combustion chamber making areas brittle. Cut out damaged areas made pieces in the combustion chamber and car is still running without water leaks. Yes We make a living repairing these so I may be slanted in our opinion but in our defense; stitching works and once painted only you know it's there. Think twice regarding welding. http://www.jandm-machine.com/metalStitching.html P8020039.jpg PA240056.jpg |
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05-18-2019, 02:48 PM | #11 | |
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Re: Repair of Police (B) Head..
Quote:
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05-19-2019, 09:46 AM | #12 |
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Re: Repair of Police (B) Head..
If you have experience gas welding and you have a piece that you would otherwise throw away, why not give this a try: First drill the crack ends. Take some old piston rings and break them in half. Put the head in a gas grill until hot, open the grill with flame still on and using a good hot torch, heat the crack until poking it with the rod (broken ring) it starts to get putty consistency. Then melt in rod, keeping it just the consistency of putty. Scrape/mix it into the crack. When done close the grill lid and slowly turn down temp over some time. Grind if rough. I've done this with amazing results. I've had people declare me an idiot over it too but it works and works well. The trick is to get the heat right so the putty consistency is there. I learned this at a booth at EAA flyin Oshkosh. The guy there would teach anyone who would listen. Was selling Acetylene torches.
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