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Workshop => Engine and Bottom End => Topic started by: JasonB on April 15, 2014, 09:43:03 PM
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Just did new rings in my 310 ESR bike. All back together and running but after it warms up and coolant gets flowing it's dribbling around a few of the head studs. The nuts are all torqued down accordingly. Did I jack up the outer oring? Bike doesn't appear to be charging the coolant system, so eithe the outer oring is not in right. Downs that sound possible? New issue for me, not sure wtf is wrong but I did install a new set of new orings . Thoughts ? Thanks in advance!
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I would think that if the outer ring was damaged, you'd see coolant leaking from between the head and the cylinder. The studs are not sealed from the cooling system. The head nuts and washers are the only seal. Maybe you could put a thin film of RTV on each side of the cylinder head washers?
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you might need to use acorn nuts if your not already and be sure theyre long enough so the stud doesnt hit the top inside. im assuming you have copper washers ? may have to use alittle rtv on them. im not sure of any other way
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The studs on an o-ringed head are not sealed off from the coolant jackets like on a head gasket setup thus acorn nuts and copper or aluminum sealing washers are needed. The OEM Honda acorn nuts work good and for sealing washers use Honda OEM 90442-028-000 WASHER, SEALING (8MM).
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udontknowme and MX250r91 are correct you MUST run accorn nuts or they will leak
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I think these are the ones I have, can't remember off the top of my head.
http://www.mcmaster.com/#standard-copper-washers/=rk81d0
Let me know an address and I'll drop some in the mail if I have enough left.
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thanks guys! I already have acorn nuts in place, just called honda up and they have an order for me for that part number listed in this thread. Should be in tomorow, those washers were like a buck a piece! pretty happy if this solves the issue. I have never had leaking issues and I have had the head off twice to swap domes. oh well, thanks for the info guys! And thanks fo rhte offer RUPP!
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with acorn nuts i have gotten away with no washers and just a little copper anti seize
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I had an engine years back with a milled head and o-rings, and because everything was cut down the head was thinner, so the studs extended too far to use acorn nuts, so I had to use regular nuts. Coolant wasn't leaking around the copper washers, it was coming up through threads and out the top.
I could have cut down the studs and used acorn nuts, but I decided to try an anaerobic sealant. It was a Loctite thread sealant, but I can't remember the exact name. It's basically like teflon tape in liquid form. It worked great.
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also, make sure the head is flat. if it is warped it will cause issues. always good to lap the surfaces when it is apart.
john
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I aint lapping crap!! that stuff is for the birds lol. Besides the bike ran before i pulled the top end, just had like half the compression it should have! I was at little sahara and had a 'filter malfunction' we will call it ;) . Bike started running choppy on the top end so I was like hell just throw a smaller main in there! did and the bike still ran funky. at that point the rings were like half as thick as they should have been just around the exhaust port. Rest of both rings looked fine, they were just ate up around the exhaust port. anyhow, cleaned everything up and tossed some new rings in there she runs great again. I will do a full tear down in the fall and split the cases to go 330 or 350. That'll do pig!
I cant remember now, but i thought i had washers on it before. I ran a set of washers I thought were what came off it when i took it apart. obviously its leaking around them now. Theres no chance i just had the nuts bare no washers is there? ESR doesnt run their heads like that i dont think
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ESR doesnt run their heads like that i dont think
The top ends always come with copper washers or washers with a copper coat. Sounds like they just got set aside.
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ya Jason Hall and I yanked the top end off in the parking lot at Little Sahara 2 weeks ago because he thought the rings were just stuck with sand in the groves of the piston. I thought everything was tossed back into the same container but its not surprising they are MIA lol. Oh well, nwe ones coming and Honda thinks they will be in tomorrow. Thanks again for the help guys!
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with copper washers and acorn nuts you shouldnt have any leaks unless the oring grooves were machined wrong but you said the head worked fine before so you should be good. coolheads ive seen had washers included. ya lapping is for the birds. unless you had a melt down your head should be fine
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installed the new washers, no leaks! Thanks guys