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Thread: Intake manifold install - ube/oil orings or RTV?

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    Default Intake manifold install - ube/oil orings or RTV?

    When installing the carb boots/manifold on you engine, do you guys recommend oiling/lubing the new orings (with ATF) for a better seal or do you recommend putting a film of RTV on the cylinder head mating surface or the boot mating surface prior to install?

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    If the rubber is nice and flexable then I use a product called Fluid Film. It's made from lanolin and so has no effect on any of the rubbers or rubber type components. It is alos nice and slippery so helps to seat the boots etc in their proper location. If the materials are getting hard and old then I would replace them as no sealant will continue to work well under flexing components.
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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    When installing the carb boots/manifold on you engine, do you guys recommend oiling/lubing the new orings (with ATF) for a better seal or do you recommend putting a film of RTV on the cylinder head mating surface or the boot mating surface prior to install?
    I have used Rubber Lubricant before to install carb boots very easily and not pinch any orings.
    You can get a lifetime supply of bead-lubricant/rubber lubricant XTRA-SLIK from Oreillys for $12.00 gallon.
    This stuff is slipperier than gorilla snot mixed with owl S%$!.
    The good part is after a while it dries out and helps to seal whatever rubber part (tires, carb boots, etc) you were trying to install.

    Click image for larger version. 

Name:	xtraslik.jpg 
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ID:	118535

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    When installing the carb boots/manifold on you engine, do you guys recommend oiling/lubing the new orings (with ATF) for a better seal or do you recommend putting a film of RTV on the cylinder head mating surface or the boot mating surface prior to install?
    Generally, sealant is not recommended on any O-ring. Light compatible lubricant is acceptable.

    When assembling the carburetor "joints" onto the cylinder head, please note that the mounting bolts are not all the same length. Putting the 20mm bolts into the wrong location will cause the long bolt to break through into the cam oil gallery.
    Kevin M. Campbell Hidden Content
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    Default Re: Intake manifold install - ube/oil orings or RTV?

    I've generally used silicone spray lubricant.

    I agree with the others - no sealants.
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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by Prairiehammer View Post
    Generally, sealant is not recommended on any O-ring. Light compatible lubricant is acceptable.

    When assembling the carburetor "joints" onto the cylinder head, please note that the mounting bolts are not all the same length. Putting the 20mm bolts into the wrong location will cause the long bolt to break through into the cam oil gallery.
    Right on Kevin.

    I'm going to add a couple things, while the carbs are off it is the best time to check compression; also when installing or removing carbs from the boots it is best to use a lube like WD which helps save the sealing ring inside the boots from chipping, also helps the seating of the carbs by reducing the friction before clamping!

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by Prairiehammer View Post
    Generally, sealant is not recommended on any O-ring. Light compatible lubricant is acceptable.

    When assembling the carburetor "joints" onto the cylinder head, please note that the mounting bolts are not all the same length. Putting the 20mm bolts into the wrong location will cause the long bolt to break through into the cam oil gallery.
    I did not even notice the difference in bolt lenght when I removed the boots.

    So you are saying the two bolt holes that seep oïl require use of the shorter bolts?

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by Du-Rron View Post
    I have used Rubber Lubricant before to install carb boots very easily and not pinch any orings.
    You can get a lifetime supply of bead-lubricant/rubber lubricant XTRA-SLIK from Oreillys for $12.00 gallon.
    This stuff is slipperier than gorilla snot mixed with owl S%$!.
    The good part is after a while it dries out and helps to seal whatever rubber part (tires, carb boots, etc) you were trying to install.

    https://www.venturerider.org/forum/a...hmentid=118535

    I cant go to the auto store right now but I do have a tube of brake caliper sliding pin grease that is heat resistant and supposed to not iterfere with rubber.

    What do you think?

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    I did not even notice the difference in bolt lenght when I removed the boots.

    So you are saying the two bolt holes that seep oïl require use of the shorter bolts?
    None of the bolt holes should seep oil.
    If any do, it is because the incorrect bolt was installed previously, thus breaking into the cam oil gallery.
    Click image for larger version. 

Name:	too long bolt damage.jpg 
Views:	26 
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ID:	118536
    Kevin M. Campbell Hidden Content
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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    I cant go to the auto store right now but I do have a tube of brake caliper sliding pin grease that is heat resistant and supposed to not iterfere with rubber.

    What do you think?
    Don't worry about what kind of lube to use on the O-rings at the base of the carb joints/holders/boots.
    As long as the head surface is clean and defect free, and the O-rings are new and proper, dry assembly is OK.
    The TOPS of the joints (where the base of the carb fits) can be simply lubricated with WD-40, Vaseline, lithium grease, etc. Not that critical. Lubrication at that location just makes carb insertion easier.
    Kevin M. Campbell Hidden Content
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    Default Re: Intake manifold install - ube/oil orings or RTV?

    OOOH post #9 what a pucker moment Bro! Great picture!!!!!

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by Prairiehammer View Post
    None of the bolt holes should seep oil.
    If any do, it is because the incorrect bolt was installed previously, thus breaking into the cam oil gallery.
    Owwwee... How did you get that picture? Wait... I don't wanna know...

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    I cant go to the auto store right now but I do have a tube of brake caliper sliding pin grease that is heat resistant and supposed to not iterfere with rubber.

    What do you think?
    Everybody has their favorite stuff. Silicone grease is OK but not my 1st choice. I would say, NEVER use WD-40 on any rubber as it will destroy it.
    Iuse XtraSlik as a rubber lubricant because I already have a lifetime supply of it for mounting tires and whatnot. It is super nasty slick when wet and when dry it does not act like a sealant, but their is a minimal surface -tack- to it.

    Click image for larger version. 

Name:	XtraSlik_.jpg 
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    But, that does not seem to be the main problem now if you already broke into the heads with the use of longer bolts. Owwwwweee,

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by Prairiehammer View Post
    None of the bolt holes should seep oil.
    If any do, it is because the incorrect bolt was installed previously, thus breaking into the cam oil gallery.
    https://www.venturerider.org/forum/a...hmentid=118536
    On both of my ventures when I first disassembled the bikes initialy to remove the boots, oïl came out of the two same holes on both bikes. So I scratched my head but marked it as normal.


    The far left front mounting hole and the rear far right mounting hole seps oil for both bikes.

    I even pulled the cams on one bike and did not seen/notice damage in these holes..

    So I am saying both of my bikes have been like this for a lo-onng time.
    Last edited by jfman; 03-26-2020 at 11:17 AM.

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    Default Re: Intake manifold install - ube/oil orings or RTV?

    Quote Originally Posted by jfman View Post
    On both of my ventures when I first disassembled the bikes initialy to remove the boots, oïl came out of the two same holes on both bikes. So I scratched my head but marked it as normal.


    The far left front mounting hole and the rear far right mounting hole seps oil for both bikes.

    I even pulled the cams on one bike and did not seen/notice damage in these holes..

    So I am saying both of my bikes have been like this for a lo-onng time.
    Were there shorter bolts (16mm long) in those holes (upper bolt on #2 cylinder and upper bolt on #3 cylinder)?
    The rest of the bolts (quantity 6) are 20mm long.
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