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copper sealing rings for pre combustion chambers ? anyone?

copper sealing rings for pre combustion chambers ? anyone?

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wibbdog
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has any found an annealed copper washer for sealing the pre combustion chambers? will this hold up? my chambers will not seal, one of the holes in the cylinder head, the threads are not perfect but will take the torque.
the sealing surfaces have been cleaned up with a wire wheel, they are not perfect. the head is at a machine shop and when pressure tested it leaks around them.(looking at the bottom of the chamber poking through bottom of the head, bubbles around chamber; head has no cracks per machine shop.) the threads of the chambers are good. i have new steel seals from CAT and i am afraid they will not work either. (they are so hard and will not conform to surface.)
so i was wondering if copper or brass (aluminum)? maybe would work.
i have checked FLORIN for old stock copper seals, they did not return call. assuming they don't have any. i am at my witts end on this thing.
and on the verge of parting it out to recuop my investment. i looked for a reman. head no luck at the many places i called. it going to cost me $500 for the valve job etc... and dont want to doo that until the chambers will seal.
any suggestion or experiance with this circumstance would be extremly appriated.
D4 7U 36840
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Fri, Apr 30, 2010 9:43 AM
Old Magnet
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If that machine shop your dealing with is any good they should be able to spot face the pre-com seats to clean them up so they will seal. The sealing washers, steel or copper are just that, they are not meant to make up for missing material. 200 ft-lbs is 200 ft-lbs, doesn't matter what the washer material is.
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Fri, Apr 30, 2010 10:16 AM
bernie
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Reply to Old Magnet:
If that machine shop your dealing with is any good they should be able to spot face the pre-com seats to clean them up so they will seal. The sealing washers, steel or copper are just that, they are not meant to make up for missing material. 200 ft-lbs is 200 ft-lbs, doesn't matter what the washer material is.
When I replaced my precoms last Fall I purchased aftermarket from Dana at Florin. I think they were about $35 each. I also ordered the seals and rubber O rings from Florin, and they shipped those as well. None of which were more than a a dollar of so each. Give him another go around. He has been very responsive to me.

When I got them, I saw the seals looked like steel, a magnet did not attract them, but I went ahead and got copper from CAT instead of taking a chance. Again, less than a few bucks each, (actually, the fellow just gave them to me). I've not seen any issues with them post install....

Try CAT.
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Fri, Apr 30, 2010 11:39 AM
YeLLoIrOn
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Reply to bernie:
When I replaced my precoms last Fall I purchased aftermarket from Dana at Florin. I think they were about $35 each. I also ordered the seals and rubber O rings from Florin, and they shipped those as well. None of which were more than a a dollar of so each. Give him another go around. He has been very responsive to me.

When I got them, I saw the seals looked like steel, a magnet did not attract them, but I went ahead and got copper from CAT instead of taking a chance. Again, less than a few bucks each, (actually, the fellow just gave them to me). I've not seen any issues with them post install....

Try CAT.
I use cat steel washers all the time, they work just fine.
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Sat, May 1, 2010 5:52 AM
bernie
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Reply to YeLLoIrOn:
I use cat steel washers all the time, they work just fine.
Wibbdog-
Send me an email with your address-I was cleaning out the barn today and found the four precom seals I got from Dana at Florin hanging on a nail where I left them. I will send them to you if you forward me your address. I may even have the four O-rings. Happy to send those as well if I find them.

Bernie
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Mon, May 3, 2010 7:14 AM
Old Magnet
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Reply to bernie:
Wibbdog-
Send me an email with your address-I was cleaning out the barn today and found the four precom seals I got from Dana at Florin hanging on a nail where I left them. I will send them to you if you forward me your address. I may even have the four O-rings. Happy to send those as well if I find them.

Bernie
Actually I would prefer to use the steel (on a good seal surface).
With the torque involved and the heating/cooling cycles it is likely that you will lose the torque setting when the soft copper extrudes.
I'd say there is a reason Cat has gone to the steel versions.
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Mon, May 3, 2010 8:02 AM
YeLLoIrOn
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Reply to Old Magnet:
Actually I would prefer to use the steel (on a good seal surface).
With the torque involved and the heating/cooling cycles it is likely that you will lose the torque setting when the soft copper extrudes.
I'd say there is a reason Cat has gone to the steel versions.
put alittle antiseize on both side of the washer helps to.
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Mon, May 3, 2010 10:20 AM
8C 361
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Reply to YeLLoIrOn:
put alittle antiseize on both side of the washer helps to.
I have never had a problem with either one sealing. Be sure to check carefully and see if there is a second seal in the head. It is quite common that someone left the old one in there when changing the last chamber. If there are two seals in there they will leak.

Tom
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Mon, May 3, 2010 3:45 PM
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