Results 1 to 11 of 11

Thread: how do i replace injectors on 6.6 2004 lly

  1. #1
    Join Date
    Oct 2008
    Location
    PA
    Posts
    22

    Default how do i replace injectors on 6.6 2004 lly

    Am I in over my head? Looking for a manual online, and lots of tips.
    Just got the replacements in the mail and ready to move fwd.
    Only going to replace #6 & #7(dont even know the postions of them yet).
    The diagnostic showed #7 failed and #6 Partially failed. Also could build no full rail pressure, only 154MPA.
    Any tips diagrams would be helpful

    Thanks,

    F

    yes I am new here!

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Welcome aboard!

    www.alldatadiy.com

    You won't do any better than that, online or in print. Unless, of course, you insist on a paper/ink solution.

    The banks are opposite that of previous GM V-8 engines. 2-4-6-8 is on the left/driver side, 1-3-5-7 is on the right/passenger side. 1 and 2 are the front cylinders.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Arrow

    154 MPA is more than plenty to run. The Number 7 is the right rear injector (Passenger side). The Number 6 is the third one back on the driver side. The high pressure lines are torqued to 30 ft lbs. The injector hold down bolts are torqued to 22 ft lbs. You will need 12 mm socket for the injectors, 17mm wrench for the injector lines. Possibly a T-30 torx for the engine harness. Basically you need your typical Japanese engine tools ........... 10, 12, 14, 17, 19 mm. Good luck.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  4. #4
    Join Date
    Oct 2008
    Location
    PA
    Posts
    22

    Default thanks for the info, was

    wondering, are the injectors on the block or under the valvecovers like my cummins.

  5. #5
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Default

    They are outside of the rocker covers aticking through the center of the head.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  6. #6
    Join Date
    Oct 2008
    Location
    PA
    Posts
    22

    Default So far so good...

    Replaced #7 injector this evening and no more knocking noises from the valve...just let me run this by you, #7 had -7 ballance and #6 had +4 ballance.

    Before I replace #6 is it necessary to replace #6 (is +4 ballance good or bad)? And any other tips on the 2 4 6 8 side?


    The lly seemed very easy so far and thanks for your previous tips!

  7. #7
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Default

    Balance rates should be 0 mm +/- 4.5 in P/N and 0 +/- 6.5 in gear.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  8. #8
    Join Date
    Oct 2008
    Location
    PA
    Posts
    22

    Default thanks for the info again, broke the plastic T

    for the fuel line that daisy chains between the injectors. This T connects to the top of the injector where the wires connect. Must be a dealer item?...cause none of the parts stores have it, right?

  9. #9
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Default

    That's correct. It comes as a complete hose/ fitting assembly. You need to specify right or left bank.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  10. #10
    Join Date
    Oct 2008
    Location
    PA
    Posts
    22

    Default Right, gotta sell me the whole left bank...

    for a fitting?...How nice, pretty costly?

  11. #11
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Default

    I don't recall the price. Might try a U-pull it yard.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

Posting Permissions

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