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Old 03-11-2012, 09:34 PM   #1 (permalink)
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base gasket exchange

About to change heads , so is it imperative that base gaskets are replace as well? If so what is required (tools,piston ring compressor ect) Thanks inadvance Dukcarver
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Old 03-11-2012, 09:47 PM   #2 (permalink)
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Just changing heads I think you will be fine.
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Old 03-12-2012, 06:40 AM   #3 (permalink)
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Anubisss Thanks for your reply, just curious have you tried this or are you speculating (as I am that reusing base "o"ring will be good). Of course I will not be disturbing cylinders, just installing head gaskets. Dukcarvr
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Old 03-12-2012, 08:23 AM   #4 (permalink)
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dukcarver,

I have removed and replaced a cylinder head for repair without disturbing or changing the cylinder base o-ring. It's best to be careful not to disturb the cylinder and "break the seal". If the o-ring has been in there for long it will have flattened and you may not be able to get it to seal again. Why not replace them? All you really need is a ring compressor, a TC's cylinders are "unbolted" once the head bolts are off.
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Old 03-12-2012, 03:32 PM   #5 (permalink)
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I have pulled the heads on my 117 w/o replacing the base gasket. My 117 does not have O-rings but cometic base gaskets. So far I have had no problems(leaks). I did not remove the cylinders and took great care not to disturb them wile the heads were off. If you do feel the need to replace the base gaskets or O-rings you can sometimes pull the ristpins out without pulling the piston from the cylinder depending on the compresson hight of the piston, to install a new base gasket. That way you don't need to worry about re honing or new rings.
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Old 03-12-2012, 04:05 PM   #6 (permalink)
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I have always wondered why people say " if you remove the piston from the cylinder, you have to hone and replace rings "... Why? Why not just put it right back together with the same rings and same cylinders? I have done this on briggs v-twins with no problems...ever....
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Old 03-12-2012, 11:51 PM   #7 (permalink)
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Streetglidekirk I agree with you,if the piston is back in its original jug ( which it has too, to be correct) why would a hone & rering be needed! But I do like 2wheelrider's way of getting around that issue(leave the piston in the cylinder). This is getting interesting ! Any body pulled cylinders installed base gasket and not honed or reringed successfully ? dukcarvr
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Old 03-13-2012, 01:32 AM   #8 (permalink)
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Dyna Ryda is reading this now saying WTF is this?
I have pulled heads and changed only HG before. If you want to change the base o-ring, you can pull the cylinder up until you can remove the wrist pin. Then you can leave the piston in the cylinder. If it were me, just pull the head and change the head gasket and forget about it.
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Old 03-13-2012, 07:16 AM   #9 (permalink)
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Quote:
Originally Posted by streetglidekirk View Post
I have always wondered why people say " if you remove the piston from the cylinder, you have to hone and replace rings "... Why? Why not just put it right back together with the same rings and same cylinders? I have done this on briggs v-twins with no problems...ever....
I also think that it would be possible to pull the pistons from the cylinders....most of the time. Maybe even every time. I not willing to break new ground in this area. Its just as easy to leave them in the cylinders.
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Old 03-13-2012, 12:30 PM   #10 (permalink)
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Quote:
Originally Posted by dukcarvr View Post
Streetglidekirk I agree with you,if the piston is back in its original jug ( which it has too, to be correct) why would a hone & rering be needed! But I do like 2wheelrider's way of getting around that issue(leave the piston in the cylinder). This is getting interesting ! Any body pulled cylinders installed base gasket and not honed or reringed successfully ? dukcarvr
Yep, pulled the cylinders on an EVO for base gaskets and reinstalled w/o hone using the same rings about 85,000 miles ago. No problems or excessive oil consumption yet, but those damn base gaskets are seeping again.
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Old 03-13-2012, 03:32 PM   #11 (permalink)
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I talked to a buddy of mine that builds top fuel drag bikes. I asked him this question on the cylinder and piston ring deal. He said that it is possible to remove and reinstall the cylinders with the same rings, but to not let the rings rotate for best results. He said if he were to do it, he would do as mentioned above by leaving the piston in the cylinder and remove the wrist pin.
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Old 03-13-2012, 03:36 PM   #12 (permalink)
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If you're not going to replace the heads immediately, get some 1/2" PVC couplings and use them with two of the head bolts to keep the cylinders in place until ready.

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Old 03-13-2012, 11:57 PM   #13 (permalink)
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So lets say you just replace the head gaskets, then the 0-rings leak. It happened to me on both cylinders when the bike had about 5K miles on it and Harley covered it.

What are the costs for you to go back and redo the job to replace the O-rings if they leak? How many miles are on the engine since it was done? If it's a lot, then thats a lot of heat cycles. If I tried to cut this corner, they'd leak. But it's just the way things happen to me I guess.

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Old 03-14-2012, 07:26 AM   #14 (permalink)
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I've pulled heads on a couple with 20,000+ miles and never had any o-ring leaks. I have nuts made to screw onto the cylinder studs, I immediately install them and snug them down when I pull the head. As the_tunaman suggested PVC will get the job done also.

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Old 03-14-2012, 07:32 AM   #15 (permalink)
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I myself would not hesitate to replace the 1.99c O ring, Its just too much hassel to go back in, but thats just me I guess.
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