perkins rear seal !

Discussion in 'Main Morgan 38 Sailboat Forum' started by stnick, Apr 11, 2019.

  1. stnick

    stnick lee nicholas

    Joined:
    Oct 27, 2012
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    1,249
    Home Port:
    Tarpon Springs fl
    Is there any way to stip the oil leak from the rear seal ? YES i have ad a mechanic take it appart clean and replace the seal ! So just Tighten the nuts ??
    I plan removing the front cove for the third time and attempt to stop the leak .Ive used TAD gaskets really no difference. This time im using Plumbers goop , Im told apply both cleaned surfaces and let it 3/4 dry and mate the two surfaces and hand tighten the nuts . Next day start the tighting pattern .
    I know a friend that used this method and he has no leaks !
    Am i expecting to much for my perkins to be on the same page as Me ?
    Im going cruising next year so i need to start now chipping down my list !
     
  2. dave_a

    dave_a Dave Ahlers

    Joined:
    Aug 15, 2006
    Messages:
    740
    Lee - the rear seal in a Perkins is called a "rope seal". I don't have my Perkin shop manual, but it's very old school, very British. A style used in a lot of British cars. (If you want a laugh, there's a picture of the Jaguar factory parking lot celebration on the web. You can't believe all the oil stains on the ground- from new cars!)

    There is an install technique that is learned over time, and perhaps a fitting tool used as well. The rope is soaked in oil, pieces cut to just the correct lengths. Probably best done by someone with 4-108 experience. But experienced mechanics have "aged out" of the trade unless you can find one down by you.
    So its not really an oil seal as we know it today. Pop it out & a new one in. Its much closer to the shaft packing, except there's one ring of flax, not three.

    Obviously the transmission & damper plate all come off, and as you know its a cramped, uncomfortable work environment back there. Hard to take your time while trying to breath! Chance of a successful install where you "stop the drip" is low. If yours is pouring out profusely you might be able to slow it.
    My Perkins leaked back there, but the oil level never went down enough to require addition oil. Much easier to change the diaper and live with it if you can.

    As far as the front cover - never did it. But the tip I have is get all the oil off the two surfaces. Use Brake clean to start the process, finish with acetone on the mating surfaces. I use Permatex black RTV. Its a thicker sealer. A thin bead on both surfaces. Hand tighten to see the RTV oozing out but don't snug down completely for 24 hrs. After its cured, torque to spec. My 2 cents, good luck
     
  3. dave_a

    dave_a Dave Ahlers

    Joined:
    Aug 15, 2006
    Messages:
    740
    Lee - I googled Perk 104-8 rear seal replacement. There's a couple Utube videos and links to look at. But if you're leaving soon and the leak isn't awful....buy diapers!
    In reading some of the testimonials I read 3 different lengths to cut the rope to. Meaning "your mileage may vary" if you try it. Good luck, buddy.
     

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