look at these compression numbers

Discussion in '60-Series Wagons' started by Nemesis Gnat, Feb 22, 2009.

  1. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    its been idling poorly, so i ran the gamut of tune ups to no avail... did a compression test

    145 30 122 130 136 145

    dripped some oil into the number 2 spark plug hole, went up to 70...

    whats yalls thinkin about this?
     
  2. NocalFJ60

    NocalFJ60

    Messages:
    3,550
    Media:
    6
    Albums:
    1
    Likes Received:
    6
    Joined:
    Aug 2, 2004
    Location:
    San Francisco Bay Area
    I hate bad compression test results too. :frown: It could be a combination of weak rings and top end on #2. When did you last check the valves? I would do a leak down test next if you have one or can borrow one.
     
  3. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    adjusted the valves about 4000 miles ago...
     
  4. Trapper50cal

    Trapper50cal TEQ Frame of Mind Supporting Vendor

    Messages:
    6,156
    Likes Received:
    1,378
    Joined:
    Mar 22, 2005
    Location:
    Durango, CO
    That stinks, sorry Gnat
     
  5. Tinker

    Tinker

    Messages:
    2,865
    Likes Received:
    9
    Joined:
    Apr 15, 2004
    Location:
    Larkspur, CO
    X2 on NoCal: hopefully you'll diagnose a leaking valve which an adjustment will cure.

    Sucks, man! I remember when my '83's head gasket went after I had done the intake manifold dance & swapped in a trick exhaust header. I was in denial for a couple weeks, trying stop-leak & chicken bones.
     
  6. Wile E Coyote

    Wile E Coyote Out in the streets, they call it murder!

    Messages:
    3,209
    Media:
    11
    Albums:
    1
    Likes Received:
    74
    Joined:
    Sep 20, 2005
    Location:
    Western AZ
    The added oil tells me rings and not valve, as far as I know.
     
  7. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    that was the thinking... i need a drink
     
  8. Wile E Coyote

    Wile E Coyote Out in the streets, they call it murder!

    Messages:
    3,209
    Media:
    11
    Albums:
    1
    Likes Received:
    74
    Joined:
    Sep 20, 2005
    Location:
    Western AZ
    Let me know how much this sucks after the new 5.3l is nestled in and you've just got out onto the highway the first time.
    Opportunity is knocking, brotha.
     
  9. Michael Hanson

    Michael Hanson

    Messages:
    8,832
    Media:
    9
    Albums:
    2
    Likes Received:
    351
    Joined:
    Oct 30, 2007
    Location:
    Plano texas
    Doesnt look good. sorry
     
  10. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    you read my mind... first i wanna find out what im dealin with

    then i gotta find a remedy for this oil burning, black smokin itch i have
     
  11. cruiser88

    cruiser88 SILVER Star

    Messages:
    11,878
    Media:
    3
    Albums:
    1
    Likes Received:
    288
    Joined:
    Feb 21, 2006
    Location:
    Winston Oregon
    Just give the old girl a dry overhual with the motor still in . You can even leave the crank in. It really is easy...w can walk you through it
     
    Last edited: Feb 22, 2009
  12. mkguyvr

    mkguyvr

    Messages:
    269
    Media:
    21
    Albums:
    1
    Likes Received:
    4
    Joined:
    May 25, 2008
    Location:
    ST.LUCIE.FLORIDA
    just saw someone going diesel in this forum last night and was selling his good running 2f dont remember where he was from but who knows ? or just start looking for a FI bowtie good luck ...by the way the rest of the numbers are all over the place how many miles you got?
     
  13. fliphkd778

    fliphkd778

    Messages:
    991
    Likes Received:
    5
    Joined:
    Mar 10, 2007
    Couldn't you just pull the pistons out the oil pan and change the rings there?
     
  14. mkguyvr

    mkguyvr

    Messages:
    269
    Media:
    21
    Albums:
    1
    Likes Received:
    4
    Joined:
    May 25, 2008
    Location:
    ST.LUCIE.FLORIDA
    only if you want to take the crank out....crank is connected to the trans...timing chain,belts pulleys hoses
     
  15. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    its only got about 180,000 miles... i dont know what the deal is there. im super strict about my oil changes and all...

    it is what it is. time for me to start doin research. right now lookin at settin up a 2fe... cam maybe...

    or i have a couple friends with 350s in need of rebuilds that they offered... although i really do have the diesel bug bad...

    this kinda adds the beginning of another chapter to my upcoming rotm
     
  16. fliphkd778

    fliphkd778

    Messages:
    991
    Likes Received:
    5
    Joined:
    Mar 10, 2007
    Well, just start by taking the head off which is fairly simple. From there, you can check your valves. If you have to pull the pistons, just drop the oil pan and then push them out.
     
  17. FJ40Jim

    FJ40Jim The Cruiser Whisperer SILVER Star

    Messages:
    10,352
    Media:
    1
    Likes Received:
    2,730
    Joined:
    Sep 26, 2003
    Location:
    Lancaster, Ohio, USA
    The oil in cylinder test is not real accurate. If too much oil is added, the additional displacement of the oil increases the CR, leading to inaccurate results. If not enough oil is added and distributed around the piston (more of a problem on flat engines), then results are inaccurate.

    X2 on pull the head. Knock valves out and inspect. Roll crank so piston is at BDC, inspect bore.

    Hopefully, it will just be a burned exh valve. 12 new stainless valves and it's better than new.
    :cheers:
     
  18. GLTHFJ60

    GLTHFJ60 Rum Runnin' SILVER Star

    Messages:
    23,828
    Likes Received:
    8,592
    Joined:
    Apr 18, 2005
    Location:
    Durham, NC
    Let us know how it goes!
     
  19. Nemesis Gnat

    Nemesis Gnat

    Messages:
    482
    Likes Received:
    5
    Joined:
    Nov 8, 2006
    Location:
    Sugarloaf, CO
    will do! my first step is to find another mode of transportation as this is my daily driver. ive got an 84 toy p/u i can borrow. next step, find a garage or work space...:rolleyes:
     
  20. rfj62

    rfj62

    Messages:
    543
    Likes Received:
    9
    Joined:
    Jul 7, 2007
    Location:
    Downingtown, PA
    Compression Test

    I did a compression test on a rig that I just bought but want to verify the way I did the test to make sure I did it right. This is the guide I used. What will a compression test tell me? — Yahoo! Autos

    I took the plugs out and disconnected the ignition coil, place the tester in the cylinder(s) and cranked for a few seconds. I cranked it for about 3-5 seconds. With each sec the PSI seemed to jump up until it would not go any higher. All readings were above 145psi's but occasionally I would get a reading of 180psi. I tested that cylinder again and got a reading of 150psi. Am I doing something wrong?
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.