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Thread: The ol' Tahoe is down for the count - coolant in cylinder(s)

  1. #21
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    That's a dirty engine (typical, really), but I like what you've found. It is definitive, which is what you want. No mysteries. Be optimistic about the rest.

    Add a set of bearings to the list, since you're going in. They're relatively cheap, and the miles justify it.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  2. #22
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    I agree with Maverick on the bearings.

    Keep in mind....The 6.5 uses "Select fit" bearing shells......Generally these are not available in the after market....Std, -.010", -.020" and -.030 for grinding the crank

    Don't be shocked to find upper and lower shells with different size markings...
    The bearings will be marked as to what they are....

    I have used the Stds in places where select fit came out. A good shot is .0025" clearance.....


    Just an FYI
    Great deals can be had on top name brand bearings and other parts on ebay...I saved big $$$$$$$$$$$$$ when I did the Dahooooley back a few years ago...

    Get things apart and then get your parts coming......By the time you need the stuff you will have it in hand.

    I am still puzzled at how coolant got on both sides of the engine........????????????????????
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  3. #23
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    A set of engine tech Rod bearings....$30
    https://www.ebay.com/itm/274546090212?hash=item3fec38e0e4:g:GxEAAOSwvdJfoKL N



    I have used this brand several times......About like what we used to call "White box" rebuilder parts.
    I used this stuff on Dahooley and the Burb rebuilds.

    I have a set of this brand sitting in the wings for my 406 cat engine.

    Careful shopping can yield great cash savings and get good parts too..


    https://www.ebay.com/itm/23252098611...YAAOSwlndZC1dk
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  4. #24
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    Quote Originally Posted by Robyn View Post
    I am still puzzled at how coolant got on both sides of the engine........????????????????????
    Open intake valves? If all three cylinders have open intake valves and coolant under pressure is being forced into #7... Is the intake manifold wet?
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  5. #25
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    Quote Originally Posted by JohnC View Post
    Open intake valves? If all three cylinders have open intake valves and coolant under pressure is being forced into #7... Is the intake manifold wet?
    Certainly possible. A perfect storm. Cylinders 8 and 7 are adjacent in the firing order and on the same journal, allowing both intake valves open at the same time. It may explain a condition if the other bank doesn't appear to be compromised.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  6. #26
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    I have not heard anyone mention the rings. If you are going this far down I would replace those due to experience. I replaced heads on a small block Chevy after a valve job and the oil consumption caused clouds of blue smoke. Since the valves sealed properly the weak rings allowed much blowby through the PCV and burned with the fuel. Not much additional $$ for piece of mind.
    \'82 K10,6.2L,4sp.OD manual

  7. #27
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    Quote Originally Posted by Old6.2 View Post
    I have not heard anyone mention the rings. If you are going this far down I would replace those due to experience. I replaced heads on a small block Chevy after a valve job and the oil consumption caused clouds of blue smoke. Since the valves sealed properly the weak rings allowed much blowby through the PCV and burned with the fuel. Not much additional $$ for piece of mind.
    SOP for gassers, for sure. 376K miles on a Diesel with no cylinder ridge (very typical of most 6.2/6.5)? I wouldn't touch them unless there is some other indicator. I've never replaced the rings on a Diesel engine I didn't bore unless there was some other reason.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  8. #28
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    I hate to toss cold water on the camp fire....but I will cast a dissenting vote.

    I have yanked 6.2/6.5 down and found the rings pretty well stuck up...

    I would vote to yank the slugs out...Clean them up well.
    Use a bottle brush hone on the bores lightly and toss in a fresh set of moly rings.

    This will give the best the little beast is going to do.

    If the pan is off and the bearings are going to be out....An extra days work at most and the job will be a better one..

    With the pan off....Timing set, seal and fresh gaskets would be smart too...

    The talk was to replace the rear main seal.....

    If it were me I would buff the head surfaces with the big 9" wire wheel to get the crud off..

    Then pop out the valves and have a peek see.....EGR engines are notorious for clogging up valve pockets with carbon....

    This junk falls off and can cause issues.

    Look at the valves and seats....maybe lap them lightly with compound and call it a day.

    Fresh valve seals would be a good idea....

    It is hard to yank an engine out and not tend to some basics......
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  9. #29
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    This was me at 11:00 pm last night:



    I am tired and sore. And the bummer is that I won't have much time to work on it in the next two weeks!

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, NP241, 4L80E, 3.42's, 285/75R16 BFG K02's; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, Turbo Master, 3.5" Kennedy exhaust, F code intake, '97 air box; dual t/stats, HO water pump, Champion radiator; Racor fuel filter; 376K miles - blew head gasket!

  10. #30
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    LOOKS VERY VERY GOOD to see the beast hanging on the lift.....

    Looking forward to seeing what else presents itself in that critter...

    Ahhhhh

    Take the time to make a sharp scribe line across the injection pump flange and the front cover at the top before you remove the IP ....

    Align the marks when you put the IP back on and it will go right to work and no other fooling will be needed.

    The computer will remember where it last found things and it will be happy...
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  11. #31
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    Working on things when you would rather be doing something else
    That was me the Christmas of 2019,the wife at the time and my Daughter decided to have Christmas without me on the other side of the country
    So instead of sitting in a house alone i pulled the 7 speed tranny out of my 2004 7500 Topkick
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  12. #32
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    Quote Originally Posted by Robyn View Post

    Take the time to make a sharp scribe line across the injection pump flange and the front cover at the top before you remove the IP ....

    Align the marks when you put the IP back on and it will go right to work and no other fooling will be needed.

    The computer will remember where it last found things and it will be happy...

    I'm hoping to leave the pump alone. I replaced the timing chain, water pump, and balancer 3 years ago as preventative maintenance.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, NP241, 4L80E, 3.42's, 285/75R16 BFG K02's; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, Turbo Master, 3.5" Kennedy exhaust, F code intake, '97 air box; dual t/stats, HO water pump, Champion radiator; Racor fuel filter; 376K miles - blew head gasket!

  13. #33
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    Copy that.....

    But if you end up removing it.....just a great way to eliminate problems.....
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  14. #34
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    Casey,
    You've identified the cause as being head gasket failure... Most likely, a result of just end of life... sorta like the head gaskets on my '01 GMC. As long as you can't identify any other damage, I'd inspect the heads (for fire-ring wear groove, flatness, cracks, etc), and if good just clean them up, and re-install with new Fel-Pro head gaskets and Fel-Pro TTY head bolts. Remember that Fel-Pro produces +.010 over head gaskets for heads/blocks that have been decked. If you need it, send me your current mailing address, and I'll send you the current Troubleshooting & Repair Guide, which will walk you through the process of how I did our 6.5TD Power Project engine assembly - including head gaskets.

  15. #35
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    Quote Originally Posted by More Power View Post
    Casey,
    You've identified the cause as being head gasket failure... Most likely, a result of just end of life... sorta like the head gaskets on my '01 GMC. As long as you can't identify any other damage, I'd inspect the heads (for fire-ring wear groove, flatness, cracks, etc), and if good just clean them up, and re-install with new Fel-Pro head gaskets and Fel-Pro TTY head bolts. Remember that Fel-Pro produces +.010 over head gaskets for heads/blocks that have been decked. If you need it, send me your current mailing address, and I'll send you the current Troubleshooting & Repair Guide, which will walk you through the process of how I did our 6.5TD Power Project engine assembly - including head gaskets.

    That is my plan! She was running great with no issues, no abnormal smoking, no blow-by, etc. No symptoms to make me think it needs a head job or ring job.

    I need to look and see if I have that guide, I don't recall. I've got several of the DP books. I will let you know. Thank you!

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, NP241, 4L80E, 3.42's, 285/75R16 BFG K02's; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, Turbo Master, 3.5" Kennedy exhaust, F code intake, '97 air box; dual t/stats, HO water pump, Champion radiator; Racor fuel filter; 376K miles - blew head gasket!

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