Page 1 of 4 1 2 3 ... LastLast
Results 1 to 10 of 36

Thread: Leak down test

  1. #1

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205

    Leak down test

    When doing a leak down test what is the best way to close all 4 valves... I have no special tools to spin the motor.

    The head cover is off.

    I've tried bumping the starter but it just doesn't seem like that's accurate.


  2. #2
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    36,398
    +1
    2,524
    When i do a leak down test i remove the rocker shaft that way i know for certain all valves are closed.

  3. #3

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205
    Thanks... .will I need new bolts if I do this?

    I don't have the manual for the 08 motor..

    Torque specs?

  4. #4

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205
    I see from a search that they are stretch bolts, which means yes I will need new bolts.

    Is there any other way???

  5. #5
    speedskixp's Avatar
    Join Date
    Feb 2008
    Location
    venice fl.
    Posts
    8,117
    +1
    120
    Quote Originally Posted by pdxrealtor View Post
    I see from a search that they are stretch bolts, which means yes I will need new bolts.

    Is there any other way???
    You can put cylinder #3 top dead center but like Jerry said, to be sure all valves are closed you should remove the rocker shaft.

  6. #6

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205
    Thanks...

    The entire motor is assembled and I cant figure out a way to rotate the thing without bumping the starter....

    I just called my local dealer and they have several bolts in stock so... looks like I'll just take the shaft off and then buy new bolts.


    Do you know the torque spec on them?

    Anything else I need to know/do/ be aware of with this process???

  7. #7
    Enufpwr's Avatar
    Join Date
    May 2005
    Location
    Lake St. Clair, Michigan
    Posts
    446
    Quote Originally Posted by pdxrealtor View Post
    Thanks... .will I need new bolts if I do this?

    I don't have the manual for the 08 motor..

    Torque specs?
    Here is a manual for your 08 RXPX.

    http://greenhulk.net/forums/showthread.php?t=94649

    08 shop manual and 09 update links are posted there in posts 8 and 9.
    Quote Originally Posted by adrianlacy View Post
    Hi guys,
    I couldn't find any free downloads for these or many others in the last few years for that matter, so I bought them. I'd actually be very grateful if someone can point me at a recent year Speedster 150 manual as well.
    2007 shop manual http://www.megaupload.com/?d=5P5OZIK1
    2008 / 2009 shop manual http://www.megaupload.com/?d=NXUNPJEI this is a 2008 manual with 2009 supplements.
    Due to the size of the files I haven't tested them with a download but hopefully they are fine.
    This is the first time I've used megaupload and it states inactive uploaded files will be removed after 21 days I think it was ......... so download like crazy to keep the link alive!
    Enjoy!!
    Quote Originally Posted by Enufpwr View Post
    Thanks

    I ended up buying a 08 RXPX manual for $5 also online....
    Here is the download link while it lasts===
    08 RXPX manual from midwest manuals.
    http://freebrd.com/AteDuck.pdf

    -rocker shaft bolts +torque specs (20 NM +90°)

    The most torque specs bolts on 4tec engine are:





    • -engine head bolt + torque specs (40 NM (30 ft lb) + 120 ° + 90 °)

    • -connecting rod bolts + torque specs (45 NM + 90 °)

    • -crank case bolts +torque specs (40 NM and then come back and tighten to 55 NM)

    • -crank case outer bolts specs (24 NM)
    • -rocker shaft bolts +torque specs (20 NM +90°)
    • -Magneto bolts +torque specs (15 NM +50°)
    • Oil spray nozzle torque specs (18 NM )
    • Cam shaft bolts +torque specs (18 NM )

  8. #8
    speedskixp's Avatar
    Join Date
    Feb 2008
    Location
    venice fl.
    Posts
    8,117
    +1
    120
    Quote Originally Posted by pdxrealtor View Post
    Thanks...

    The entire motor is assembled and I cant figure out a way to rotate the thing without bumping the starter....

    I just called my local dealer and they have several bolts in stock so... looks like I'll just take the shaft off and then buy new bolts.


    Do you know the torque spec on them?

    Anything else I need to know/do/ be aware of with this process???
    You should still put #3 top dead center before removing the rocker shaft. It will take all the pressure off of it. You can rotate the engine by removing the venturi and tail cone off of the pump and use a allen to turn the engine with the spark plugs removed.

  9. #9

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205
    Thanks... Darren...

    My rings are shot....

  10. #10

    Join Date
    Jul 2007
    Location
    PDX - Oregon
    Posts
    2,205
    Nevermind ..... I'm retarded sometimes...


    My snap on lead down gauge had me confused.

    The forward most cylinder is borderline at 35%, the other two are a hair above 25%...

    That's a relief..... even though all cylinders could be better it's not completely shot. I've read 15% or lower is optimal, but I'm a rec rider chasing a problem and this was one thing to eliminate.

    EDIT-- I adjusted the numbers above to FIRST represent % not psi! And secondly to reflect the reading obtained after adjusting the air pressure to 75 PSI on each reading.

Page 1 of 4 1 2 3 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Leak Down Test
    By FLjoyrider in forum Polaris Open Discussion
    Replies: 7
    Last Post: 04-10-2008, 06:56 PM
  2. Pressure / leak down test
    By bainer1290 in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 12-22-2007, 01:12 PM
  3. Leak Down test
    By texoma in forum Polaris How To & FAQs
    Replies: 1
    Last Post: 06-03-2007, 07:19 PM
  4. leak down test question:
    By Pale Rider in forum Sea Doo Open Discussion
    Replies: 13
    Last Post: 11-23-2006, 09:56 AM
  5. Leak down test
    By Red Devil in forum 4-Tec Performance
    Replies: 35
    Last Post: 10-11-2006, 07:48 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •