1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Noise upon startup after teardown

Discussion in '1st Gen. Tacomas (1995-2004)' started by GMRTOY, Sep 16, 2009.

  1. Sep 16, 2009 at 10:42 AM
    #1
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    Hi all- Just completed reassembly after replacing rod bearings on this 02 2.7L 4 Cyl gas engine W/ 47K on thee odo. Came in for rod knock-found bearing separation on No. 3 & 4. bearing inserts. Apparently faulty manufacturing:notsure:- no blueing/no heat evidence. Of course we had the cams and lifters out and our timing has been double checked. ( the balance shafts were not removed) Upon initial startup, there is a knock/rattle that sounds as if the pistons are touching the valves. Wondering if anyone has had the opportunity to experience this? Waiting at the screen.Thanks- GMRToy
     
  2. Sep 16, 2009 at 10:53 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,898
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    It's a non inteference engine so the valve shouldn't be slapping the piston.

    Did you secure the sub gear to the main gear when you removed the exhaust cam?
     
  3. Sep 16, 2009 at 11:08 AM
    #3
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    Negative- Did not secure the sub gear to main gear on exhaust cam.
     
  4. Sep 16, 2009 at 11:17 AM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,898
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
  5. Sep 16, 2009 at 2:03 PM
    #5
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    98Tacoma27- Thanks for the response. We yanked the exhaust cam- tensioned the spring, installed the temp bolt, & reinstalled the shaft & removed the bolt. Started the engine and let oil pressure build, the engine is relatively quiet at idle. but when the throttle is cracked- immediatly there is this rapping/rattling noise that does not abate until base idle is achieved. Even then (base idle) the noise is still audible and it can be felt when my hand is on the engine. when the clutch is depressed there is no change- & the vibration is transferred to the pedal as well. Scratching our collective head... Thanks- GMRToy
     
  6. Sep 16, 2009 at 2:37 PM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,898
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    Can you use a stethoscopeto determine the exact location? I gather that engine runs fine (no roughness or engine bouncing) except for the rapping noise? Did the re-install make a change?
     
  7. Sep 16, 2009 at 3:35 PM
    #7
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    98tacoma27- I tried pinpointing with a steth early on, but the noise is so prevalent that it seems to be all over. If I had to say- then the block seems to transfer the most noise. This noise was not there before teardown- just the rod knock. And yes- the engine seems to run fine otherwise, although I haven't tried revving very much beyond low/medium idle. This engine has very little wear anywhere- crosshatch still at top of ring travel, machine ridges still on main inserts, no out-of-round or taper on rod journals. Thanks- GMRToy
     
  8. Sep 16, 2009 at 3:38 PM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,195
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Hmm....You say the noise was not there before the tear down....May seem stupid to ask, but was anything dropped intot he engine crank case?
     
  9. Sep 16, 2009 at 3:41 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,195
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Im also thinking a loose timing chain.....?????
     
  10. Sep 16, 2009 at 4:52 PM
    #10
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    By the way- no CEL. We've Thought maybe timing chain- but the noise carries with it some serious vibes. Sometimes this strikes me as a heavy scraping noise as with a flex plate broken. Or comparable to an older 2.5 GM With a worn phenolic timing gear.
     
  11. Sep 16, 2009 at 5:04 PM
    #11
    XBrown

    XBrown Spartacus!

    Joined:
    Jun 11, 2009
    Member:
    #18334
    Messages:
    58
    Gender:
    Male
    First Name:
    Xavier
    Phoenix, AZ
    Vehicle:
    04 Tacoma SR5
    Sounds like it might be piston slap. Did you put the rods/pistons back in the same cylinders?
     
  12. Sep 16, 2009 at 5:37 PM
    #12
    GMRTOY

    GMRTOY [OP] Member

    Joined:
    Sep 16, 2009
    Member:
    #22843
    Messages:
    6
    Gender:
    Male
    As for piston slap- did not remove pistons from rods, located pistons in same holes, located rods w/ marks to the same side of crank, did locate ring end gaps in same position as removed. No slap before teardown. How much noise & vibration could come from a loose timing chain? When we did exhaust cam gear as per 98tacoma27, I pushed on the chain below the intake cam sprocket & got a little movement- did'nt seem like any slack.
     
  13. Sep 16, 2009 at 6:33 PM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,898
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    Have you looked at the crank since? I am wondering if you have spun a bearing.
     
  14. Sep 25, 2009 at 6:59 AM
    #14
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,898
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
  15. Sep 25, 2009 at 7:20 AM
    #15
    fletch aka

    fletch aka www.BeLikeBrit.org

    Joined:
    Jan 4, 2009
    Member:
    #12223
    Messages:
    7,103
    Gender:
    Male
    First Name:
    Gary
    Left Coast
    Vehicle:
    09 Magnetic Gray TRD OffRoad
    TRD cat back exhaust, TRD Cold Air Intake, differential breather mod' Hellwig rear sway bar, 16x8 TRD Ivan Stewart's, Michelin LTX A/T2, DTRL Stealth Mode Mod, custom "Texas Edition" shift knob, Sock's "Classic" bedside decals, MetalMiller custom grill emblem, 20% front tinted windows, tinted taillights, Viper alarm, ScanGauge II, Flyzeye Designs V2W Tacoma Interior LED lighting, de-mud flapped, de-badged, extra D-rings under bed bolts, WeatherTech ED floor mats, G4 Elite Fold a Cover ,Toyota bed mat, tailgate theft deterrent device and absolutely no plasti-dip!
    :popcorn: interested
     
To Top