FireHead Posted October 2, 2004 Report Share Posted October 2, 2004 (edited) I have an aftermarket head that takes the Pro-Design O-rings, but I can't seem to keep the O-rings from squirming out when I got to assemble the head. Every time I go to start the bike after redoing it, leaks reappear. I have tried the grease trick to keep them in place. Does anyone have any other tips and or ticks that they would share? Has anyone ever tried using an Anerobic sealer in place of the O-rings? Do you think an Anerobic sealer would withstand combustion temperartures? Any help at all would be great. This thing has been pissing me off for a week now. Edited October 2, 2004 by FireHead Quote Link to comment Share on other sites More sharing options...
sredish Posted October 2, 2004 Report Share Posted October 2, 2004 (edited) Man, I'm sorry, don't know what Anerobic sealer is. I've always used the grease method and it's worked fairly easily. Who is the mfg of the head? I guess I don't really have any other tips/info, I just grease them liberally, and put it together slowly and tighen everything up systematically. You might try giving Dave a call at NossMachine.com and see what he has to say, he might have some ideas or a different way to approach it. Good luck. Edited October 2, 2004 by sredish Quote Link to comment Share on other sites More sharing options...
frocashmoney24 Posted October 2, 2004 Report Share Posted October 2, 2004 dont lob the grease on there to much. just a light greesing, then run your finger along the oring into the groove, sometimes it can take a few times to get it to stay, but when it goes in, it'll stay. then just assemble it slowly making sure thtey stay in there, good luck man Quote Link to comment Share on other sites More sharing options...
fixitrod Posted October 2, 2004 Report Share Posted October 2, 2004 When you get the head about 1/2 to 1/4" from setting on top of the cylinders peek under it with a flashlight. I use grease on mine and never had a problem. I've only taken it off 3 times though. Maybe there is something wrong with the head or the set of orings you have. Try the flashlight thing and make sure the orings stay in the head when dropping it on they stay in. If so, maybe try some new orings. If still no luck, it has to be the head or the cylinders are seating all the way creating a flat surface for the head to sit on. Quote Link to comment Share on other sites More sharing options...
lincster Posted October 2, 2004 Report Share Posted October 2, 2004 How many times have you reused your o rings? I got leaks after 2 reuses and then replaced them with new and I haven't had any problems since. Pro Design recommends 2 uses at the most on a set. Quote Link to comment Share on other sites More sharing options...
Big Blue Posted October 2, 2004 Report Share Posted October 2, 2004 nick in the mating surfaces on the head? bad o-rings? or head may be warped. Quote Link to comment Share on other sites More sharing options...
FireHead Posted October 3, 2004 Author Report Share Posted October 3, 2004 I have tried to reseal the head with this current set of o-rings twice. I have a new set that I will be using when I pull it apart again. The head is made by RK-Tek. I checked the head on a granite table and there aren't any parts of it that are warped. While there arne't any nicks our gouges in the o-ring groove the o-ring doesn't seem to seat into the groove like every other o-ring application that I have encountered. The o-ring wants to keep popping out of the groove in other words. Maybe I need stickier grease. If anyone is interested in knowing what an anerobic sealer is, here is a link to Loctite's web site. Clicky Clicky Quote Link to comment Share on other sites More sharing options...
sredish Posted October 3, 2004 Report Share Posted October 3, 2004 The o-ring wants to keep popping out of the groove in other words. Maybe I need stickier grease. Stickier grease... yea, maybe. If you were to lay the orings over the grooves, they're always a tad bigger, you have to "massage" them into place, and, with the grease trick, will hold themselves in there. So they've been on the machine, you took the head off and you've since tried to put it back on twice? Why not go ahead and use the new orings. Quote Link to comment Share on other sites More sharing options...
FireHead Posted October 3, 2004 Author Report Share Posted October 3, 2004 The last two sealing attempts have been on the same set of rings. There have been two sets before that and now I have a brand new set. I will be using the new set when I try agian, which the way work is going right now, ought to be some time later in the week. Quote Link to comment Share on other sites More sharing options...
sredish Posted October 3, 2004 Report Share Posted October 3, 2004 What a PITA, huh? Quote Link to comment Share on other sites More sharing options...
FireHead Posted October 3, 2004 Author Report Share Posted October 3, 2004 I'm pretty tired of dealing with that thing. I have a head deisgned and have tool pathes run for it. I may go in today and cut it, but if I do that I gurantee I'll have some sealing problems with it initially. I tempeted to just by a new one and side step the hassle. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted October 3, 2004 Report Share Posted October 3, 2004 Is it new? Have you called RK and asked them about it? I don't know what size orings they used. If the cross section is 0.070" The oring groove should be pretty close to .085 wide and .050 deep. Where is it leaking? Quote Link to comment Share on other sites More sharing options...
SDD Posted October 4, 2004 Report Share Posted October 4, 2004 I just put my RK tek head on last week... I bet it's the large orings that seal the head onto the cylinders. I used enough grease to hold the ring in place when I inverted the head shell. I was able to slide the shell down far enough that I could shine a flash light in there and double check everything was still in place. What compression ratio did you have Kelsey set your head up to run? Quote Link to comment Share on other sites More sharing options...
Capone Posted October 4, 2004 Report Share Posted October 4, 2004 Dunno if this will help, but I use vasoline, get the orings in there and wipe it across them. works nicely, no grease mess. Quote Link to comment Share on other sites More sharing options...
FireHead Posted October 4, 2004 Author Report Share Posted October 4, 2004 I had RK TEK set me up with 18cc domes for a +7mm stroke. I like the Vasoline idea. I'll have to try that. I have called twice regarding the problem and everything seems to check out. They keep telling me that the Pro Design o-ring sets are fine to use, but I think that might be BS. The o-ring grooves seem to be the wrong radius or atleast not the radius I would use when I would put the size of o-ring in a part. The head is leaking out of the right side dome, two of the stud holes, and out of both spark plug pockets. Quote Link to comment Share on other sites More sharing options...
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