Leaking EVO Rocker boxes

Discussion in 'Engine, Fuel and Exhaust' started by BOBFLHTC, Feb 17, 2011.

  1. BOBFLHTC

    BOBFLHTC Active Member

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    I did the Top End on my EVO in the fall but the Rocker boxes are leaking even though I tried to be careful. I saw that JPCycles is selling a set of after market 2 piece Rocker Boxes for $175 so I am going to swap them out. It looks like a good deal and anyone with a EVO knows how frustrating this can be. Best of luck - Bob

    Milwaukee Twins Rocker Box Set | 991-087 | JP Cycles
     
  2. flhtk11

    flhtk11 New Member

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    If you tightend them evenly and corectly, and they are leaking, you damaged the little rubber gasket(s) I'd bet.
     
  3. Jack Klarich

    Jack Klarich Expert Member

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    The torquing is critical as well as warming up the motor before riding, only down fall of the factory rocker boxes Good Luck:s
     
  4. BOBFLHTC

    BOBFLHTC Active Member

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    I tried to be real careful torqeing them. The middle cover shifted before they were at spec. The oil isn't pouring out but they leak. Maybe they are warped. At any rate it seemed like a good price and since I have to take it apart anyway I'm hoping it will put the whole problem to rest. I'll post an update once I get them on - Bob
     
  5. y2kflhr

    y2kflhr Active Member

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    I'm no expert but after just putting mine back together my bet would be the gaskets, you probably need to replace them and start over, which would be cheaper than the rocker boxes
     
  6. Jack Klarich

    Jack Klarich Expert Member

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  7. NEWHD74FAN

    NEWHD74FAN Experienced Member Retired Moderators

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    Personally I do not believe in changing what is likely perfectly good hardware, unless there was actually something wrong with them or if you want because it is adding BLING. Gaskets are a lot cheaper and properly torqued with thread sealer for the fasteners should be sufficient, save the money for something YOU need or want on your terms, not shotgunning a perceived problem, you will be happier. JMO...:s
     
  8. 89stroker

    89stroker Active Member

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    I had done some work to my evo as well and thought i was careful putting back together but I had a leak. Took apart again and found I had pinched the gasket. 2nd time I made sure I didn't do that again.
     
  9. Jack Klarich

    Jack Klarich Expert Member

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    Bob, if this is indeed an 85 Evo, and you have had the rocker boxes off a couple of times now, first, I would check them for true on a piece of glass first if they do not rock you should be good with a quality gasket set like http://www.jamesgaskets.com/ if you want to replace the boxes for a better quality rocker box the ones in your first post are good, the TP are better but more expensive, but NEWHD is #1 if you can repair it with new gaskets you have more money for BLING, be sure to follow the manual for proper removal and retorquing of the boxes, and good luck
     
  10. Crocker

    Crocker Active Member

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    you will have more issues with the $175 rocker boxes then your oems ones cheep repop parts will always get you in trouble , as others said start over with new gaskets, I prefer to use a product called THE RITE STUFF instead of gaskets as long as clearences are not involved, the rite stuff is a permatex product avalible at NAPA auto parts ,most auto makers use this product or stand behind it ,check it out . I have used this stuff for years first when I had hard time finding correct gaskets then as time went on I use it and hang the gaskets on my garage wall.Im 100% satisfied with this product .