Penn Yan transmission

Discussion in 'Inboards' started by Bilito, Feb 21, 2010.

  1. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    Hi all, newbie here
    Just got a 1980 penn yan explorer with a 351 and it has what I think is a velvet drive tranny.

    Two questions, well three actually
    How can I ID the tranny?
    I can turn the prop by hand if it is in any gear is that supposed to happen?
    I see there are what appears to be some water lines running to the tranny I assume they are to cool it down???

    The motor is bad and we plan to overhaul it so I have never seen it run, just want to know what is what
     
  2. gonzo
    Joined: Aug 2002
    Posts: 15,439
    Likes: 1,011, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    There should be an ID plate with the model and reduction ratio riveted to it. On that engine you most likely have a 71. The clutches are hydraulic so there is little friction when the engine is not running-they are disengaged. There are water lines in the back to cool it. A rebuild kit is less than $180.00. If you have everything out, might as well put new clutches and seals.
     
  3. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    Thanks for the tranny info, where on the tranny should I find that ID plate? I am pretty handy is that rebuild a DIY deal?
    Not 100% sure if we have to pull the motor yet, going one step at a time.
     
  4. gonzo
    Joined: Aug 2002
    Posts: 15,439
    Likes: 1,011, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    1 person likes this.
  5. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    How do you check it once I get the motor going to see if needs a rebuild or not. The oil looks clean and does not smell
     
  6. gonzo
    Joined: Aug 2002
    Posts: 15,439
    Likes: 1,011, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It shouldn't slip but engage rapidly and you can check the oil pressure at one of the taps on the top.
     
  7. powerabout
    Joined: Nov 2007
    Posts: 2,925
    Likes: 66, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    You mean hydraulic lines going to a cooler....
     
  8. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    What to do

    I have the motor and tranny out and sitting on a dolly. I plan to send the motor out to be rebuilt. What should I look at on the tranny. What can go wrong with it??

    the tranny is attached to a bell housing, do I take the tranny off the bell housing? will anything fall off doing that?

    Bilito
     
  9. powerabout
    Joined: Nov 2007
    Posts: 2,925
    Likes: 66, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    How about a photo?
     
  10. gonzo
    Joined: Aug 2002
    Posts: 15,439
    Likes: 1,011, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    The bell housing is an adaptor to be able to bolt it to the engine. Get the manual and it will be easier to understand the transmission.
     
  11. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    Changing Tranny oil

    How do you change the oil in my velvet drive, I don't see a drain anywhere.
     
  12. gonzo
    Joined: Aug 2002
    Posts: 15,439
    Likes: 1,011, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    The line that goes to the bottom has to be disconnected. There should be a screen with a spring there too
     
  13. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    broke the hose removing it

    Cooler hoses have been on a long time and one rusted end fitting broke in removal. How much pressure is in those lines???? I am thinking to get a pair of braided metal flex hoses.
     

  14. Bilito
    Joined: Feb 2010
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: miami

    Bilito Junior Member

    What is the pressure ???

    How much pressure is in the cooler lines??????
     
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.