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New 6.5 owner from metro Detroit

Discussion in 'Introductions' started by Matthew Thieme, May 14, 2018.

  1. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
    E3EB6279-1F0E-4F63-A1C6-3CE8E4B34AA1.jpeg 2D7BD853-7F93-4FE2-A1B1-D17E58440626.jpeg FCEA33A3-B55D-4A3B-AC31-3BD7D788F00A.jpeg Hello everyone, I bought my first diesel truck a few months ago ( 1994 gmc 3500 reg cab drw 2wd 6.5 turbo with 215k)
    I’m really liking it so far, and have been trying to go through it as I’m able to get everything fixed or upgraded as needed. It already has the pmd relocated.

    When I bought it there was a lift pump problem and bad vibrations at highway speeds and a nonfunctional wastegate on the turbo.

    I have figured out the lift pump( oil pressure switch), vibration ( bad rear brake drums) and installed a turbo master to fix wastegate. I’ve been replacing all the fluids and filters with Amsoil one at a time and bought new tires all round.
    I’m getting ready to do trans filter and fluid soon (4l80e) and want to address a harsh shift from 1 to 2 gear. Trans has been rebuilt and has a shift kit installed by previous owner. I’m thinking maybe the 1/2 accumulator is bad and would like any input on that.

    Also it runs well and starts right up on the coldest morning with a tiny puff of white smoke that clears right up but I feel like maybe the acceleration and mileage should be a little better. I’m averaging around 13mpg with mostly city driving, and around 16 on the highway. I’m thinking the injectors might be original but I’m not sure. Does that sound like a candidate for new injectors?

    Overall I’m really enjoying the truck and learning about diesel in general. It has a cool hydraulic bed cover some of you might get a kick out of. I’ll try to include some pics, thanks Matt.
     

    Attached Files:

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  2. Will L.

    Will L. Well-Known Member

    7,406
    6,008
    Jan 25, 2013
    Boulder City Nv
    Welcome to TTS.

    Mileage doesn’t sound as good as it should be.
    Careful who you buy your injectors from- a lot of crap ones out there. Leroydiesel.com is a vendor here and well trusted for good parts at a fair price. If you get a new set from him, you can hold on to your old ones as a rebuild option for the future.

    With that mileage on there check/ replace the harmonic balancer. I wont run them over 100,000 on these engines. Crank killer. Dont get the doorman or other cheap ones. AC Delco for the next 100,000 miles or best is a fluiddampr good for the rest of forever.
     
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  3. BIGR

    BIGR Lucky To Be Here

    5,273
    2,768
    Jun 9, 2008
    Appalachian Mountains
    Welcome to The Truck Stop, Matthew, nice truck.
     
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  4. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
    That’s kinda what I was thinking, mpg could be better. Original owner seemed to do a decent job documenting repairs and I don’t see anything about injectors. So it won’t surprise me if they are original.
    As far as the harm bal goes, I looked it over recently and don’t see any problem but it’s definitely something I’ve been conscious of. Thanks
     
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  5. Matthew Thieme

    Matthew Thieme New Member

    10
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    May 14, 2018
    Detroit
    Thanks
     
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  6. smokymtn65

    smokymtn65 Well-Known Member

    283
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    Aug 21, 2015
    East TN
  7. Jaryd

    Jaryd Oh the sound a 6.5 makes

    648
    792
    Nov 27, 2016
    Hodges, SC
    Welcome. Good looking truck you got there. I got one just like it but sadly it’s my parts truck. Got body and frame damage on front drivers side. I like the looks of the single cab duallys
     
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  8. Matthew Thieme

    Matthew Thieme New Member

    10
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    May 14, 2018
    Detroit
    Thanks, I like them too, it’s not a combo you see a lot of.
     
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  9. Jaryd

    Jaryd Oh the sound a 6.5 makes

    648
    792
    Nov 27, 2016
    Hodges, SC
    Relocate the pmd to behind the front bumper and it’ll last a little longer
     
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  10. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
    2,534
    Nov 15, 2009
    AZ
    Welcome.

    Filters are more important than "the oil". Start by getting rid of the gravel screen K&N ring duster and put in a real air filter. Check the fender and see if the restrictive intake snorkel is still in there. With 2500 to 5000 mile oil changes on this engine synthetic, esp. Amsoil, is hard to justify in this dirty running engine. A good oil filter is justified. AC Delco oil filters are not good oil filters anymore with the Ecore, The Fram group is not, Purolator is not. (The Fram Group makes a lot of expensive brands now.)

    Pull the oil cooler away from the condenser and clean out the mat of dirt build up there. Are the oil cooler lines stiff and leaking just waiting to blow out and take the engine with em?

    MPG at what MPH? I can't break over 15 MPG esp. with the AC on. The Turbo master is not MPG friendly as the OEM system because the OEM system will open the Turbo Waste Gate during cruise. The Asthma Attack Small Turbo GM used will generate 6 PSI of boost from airflow alone without any fuel on. This is why the WG opening up to reduce unneeded boost can help MPG.

    Shift kits... They shift hard ya know? Either slip the trans to near burn up with butter smooth shifts or risk hard parts with a quick hard shift. You are after all attempting to slow down a high torque diesel... I would reverse the shift kit and toss the weak OEM Torque Converter myself. The TCC clutch is the #1 thing I burn up. Seriously Trans problems DO NOT turn on the Service Engine Soon light. So check for any codes in the computer to see if something is causing a hard shift due to limp mode etc.

    Do you plan to tow hard and heavy: Cooling systems, better turbo...
     
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  11. snarl95

    snarl95 Active Member

    342
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    Feb 22, 2014
    Edenton,NC
    Welcome.
     
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  12. btfarm

    btfarm 330,000 Worth and counting Staff Member Moderator

    16,578
    2,331
    May 12, 2008
    Sandwich, Illinois
    Welcome To the Truck Stop!
     
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  13. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
     
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  14. Matthew Thieme

    Matthew Thieme New Member

    10
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    May 14, 2018
    Detroit
    That’s on the list of things I’ve been thinking about doing actually.
     
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  15. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
    Thanks for the input, I’ve had good luck with Amsoil over the years but I understand your sentiment about it being hard to justify in an old dirty diesel. I have to admit I was a little disappointed to see it turn black in the first 24 hours. That said I believe good oil and filters are important to any engine, I guess value is relative.
    I’m planning to change oil hoses because they do leak a little apparently and I can’t stomach the thought of all my oil pouring out onto the freeway at 75 mph.
    A better intake and filter is also in the plan book.
    I understand shift kits make the shifts harder but I’m not sure what is normal or not. All shifts except first to second seem fine but that one two shift is pretty severe. I’m not experienced with transmissions but I’m a quick learner and love challenging myself. So I’ll give it a go when funds allow me to start chipping away at the list, it seems to grow faster than I can cross things off.
     
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  16. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
    Thanks
    thanks
     
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  17. NVW

    NVW Well-Known Member

    8,691
    1,293
    May 5, 2008
    Castor, AB.
    Welcome to TTS, nice truck, I like the bed cover.
     
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  18. Matthew Thieme

    Matthew Thieme New Member

    10
    19
    May 14, 2018
    Detroit
    Thanks, everyone gets a kick out of it when they see it going up. I’ve never seen one like it myself.
     
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  19. MrMarty51

    MrMarty51 Well-Known Member

    1,231
    1,094
    Aug 1, 2017
    Miles City, Montana
    Welcome to the truck stop Matthew.
     
  20. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
    2,534
    Nov 15, 2009
    AZ
    K47 air filter option with OEM intake from a later year 6.5 diesel is the best frugal intake to get. Make sure any aftermarket isn't a hot underhood air intake and check the specs on the filter. Oiled band aid gauze ring dusters aren't going to cut it when there are better aftermarket filters out there. Paper does the job.

    Yeah synthetic may have saved me a 6.5 engine I scuffed a piston in once. If you tow and run hard you will find Used Oil Analysis backs up the 2500 mile oil change in the owner's manual: it doesn't have 500 miles left in it! High soot, out of grade, wear metals high, and that's with adding a quart every 500 miles. 3000 miles gets me a phone call from the lab... Only way to clean these engines up for the oil is gapless rings:

    http://www.thetruckstop.us/forum/threads/total-seal-gapless-rings.29135/
     
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