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CVO Technical => Twin Cam => Topic started by: Dacuda on August 13, 2020, 11:13:26 AM
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I just pulled the Cylinders because I’m just had head work done, when the shop did the 110-117 upgrade in addition to using the orange o-ring they also used a high temp sealant on the cylinders to the case. Is this a better idea to minimize oil from seeping at the base????
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Dacuda,
On the flat base gaskets we've been using the copper spray on the gaskets.
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With orings I am not a fan of using sealant. I have used hylomar or loctite 518 and just metal to metal sucessfully.
That stuff on the spigots looks like permatex.
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Thanks Don 👍
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There are those that always believe that if belt is good then belt and suspenders must be better. I prefer to trust the product manufacturer's guidelines (barring some significant product history otherwise). There ain't none of us that actually know more about the manufacturer's product than the manufacturer and/or OE supplier/builder. We're told to use the o-rings without other sealants. So that's what I do. FWIW.
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There are those that always believe that if belt is good then belt and suspenders must be better. I prefer to trust the product manufacturer's guidelines (barring some significant product history otherwise). There ain't none of that actually know more about the manufacturer's product than the manufacturer and/or OE supplier/supplier. We're told to use the o-rings without other sealants. So that's what I do. FWIW.
:2vrolijk_21: :2vrolijk_21: Various gasket sealants became popular (and necessary in many cases) back when gaskets were stone age materials and joints were far from precise. These days, MOST manufacturers provide very accurate sealing surfaces and the various seals and gaskets are made from modern high performance materials. Barring a screw-up in manufacturing, extra sealants are not necessary and in some cases actually cause problems. Just because we used to apply adhesive sealants to gaskets in the old days doesn't mean those things are still necessary on modern equipment. Keep it on the shelf for when you restore some old iron instead.
JMHO - Jerry
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I'm in the process of rebuilding one of my 110s (2010) and set the cylinders last weekend (currently waiting on heads). Was debating with myself about additional sealant but decided against it, glad I did now.
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Mine are seeping...again........ESP issue on the latest rebuild...so......gonna get it fixed at the end of the season. For now, the compensator is the issue to be dealt with (this will be the 5th!) Ignoring the seeping for now to try and get the bike in and out of the shop as quickly as possible.
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Dayne,
I haven’t used it yet, but have been hearing positive feedback on the DarkHorse compensator replacement. Might be something to consider.
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I'm no expert but I did my lower "0" ring on the rear cylinder plus some other bits (with help well appreciated help from members of this site) when it started leaking don't know how or why it started to leak but it did.
When installing I just used a small amount 1100°c copper grease smeared it around the "0" rings just to help them seat into place rather then being dry when installing the cylinder. Didn't use anything on the gaskets only where "0" rings are required.
It's been 2 years now and no issues as far as any oil leakage.
Not too say there's been plenty of other HD issues keeping me on my toes.
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I was given advise by a respected HD mechanic to put a very small wipe of high temp silicone on the flat surface of case when installing cylinders with o-rings, and around the return oil o-ring as previously mentioned. He actually specified a small wipe on the 3 to 9 o’clock position on the downhill side.
I’m just a parts changer trying to learn myself.
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I was given advise by a respected HD mechanic to put a very small wipe of high temp silicone on the flat surface of case when installing cylinders with o-rings, and around the return oil o-ring as previously mentioned. He actually specified a small wipe on the 3 to 9 o’clock position on the downhill side.
I’m just a parts changer trying to learn myself.
;) Right on.
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I was given advise by a respected HD mechanic to put a very small wipe of high temp silicone on the flat surface of case when installing cylinders with o-rings, and around the return oil o-ring as previously mentioned. He actually specified a small wipe on the 3 to 9 o’clock position on the downhill side.
I’m just a parts changer trying to learn myself.
Thankyou TN and John
Easy for those who have not experienced small leaks from the O-rings to say no sealant needed
It does occur more often than it should
Just another of HD's shortcomings that has to be addressed
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On my 117ci build i didn't use any type of sealant as i have read lots of comments that says no need, while break-in it starts leaking again some says it will stop after a week time.. ok nothing change bike dyno tuned and after one month had to open engine again to fix the issue, new set of gaskets $$ this time used small amount of sealant.. issue solved
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Just looked at mine.....stopped!!!
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Just looked at mine.....stopped!!!
Eek.....quick check the oil :huepfenlol2:
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Eek.....quick check the oil :huepfenlol2:
Hahaha.....I did.......1/2 a litre from full........might have dropped a couple mm in 3500 km.
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Hahaha.....I did.......1/2 a litre from full........might have dropped a couple mm in 3500 km.
Right there is your problem. You're using metric oil in an American engine. No wonder it's ticking.