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#1 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,395
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I'm now in the diesel club w a 99 6.5L HO engine - help
Just completed a deal for a 1999 K2500 GMC Suburban w a 6.5L HO engine that has 42k total miles. It's a rig that I 'm getting directly from a fire department and it's been well maintained.
I've read these 6.5s can benefit from relocation of the pump mounted driver (whatever that is) and are prone to harmonic balancer failures. Any advice on what steps to follow or aftermarket items to purchase in order to keep the engine running reliably for many miles?
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#2 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Nice Pete! 42k is pretty low miles. Luckily, I haven't worked on one of these for years.
![]() https://www.dieselhub.com/maintenanc...elocation.html I'm not sure which ones are the best to purchase these days. I can check into that. These are decent engines just don't expect a lot of power from them with a long life. I know guys, and have read online a lot about it, that turn the boost up or put a bigger turbo on them, and it's a matter of time before the magic smoke and parts come out. You probably want to run a fuel system lubricant in it every few tanks of fuel to help keep the injection pump alive. These were designed when sulfer was still in the fuel and I know the ulsd doesn't help those injection pumps. I like to use stanadyne fuel system treatment. You can usually get it at local parts stores or it is available online. https://www.google.com/search?q=stan...client=gws-wiz On the harmonic balancer issue, I'm pretty sure you will have to remove the crank pulley and inspect the rubber to determine the condition. Otherwise if you feel/hear any vibrations or bird chirping sounds while it is running, it is probably okay. Usually front main seals leak and saturate the rubber which breaks it down and starts the separation.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#3 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,395
|
Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Awesome Ryan thanks so much. I also read something about oil lines that can separate at a C clamp and that aftermarket replacements with compression fittings are available. I’ll address all the issues you raise. I was hoping to run a Diesel engine free of any additives/fluid but the lubricant won’t be too onerous. Apparently Hummers used this same Diesel engine.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#4 |
Registered User
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,786
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Re: I'm now in the diesel club w a 99 6.5L HO engine - help
congrats! no pics?
fun to to tinker on but after a few hmmwv water pumps I'd rather have a root canal ![]() but seriously good luck and folks like Ryan know the tricks the factory left out..
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I started out with nothing - and I still have most of it |
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#5 | |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Quote:
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#6 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,395
|
Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Thank guys. Here's a link to a few photos: https://67-72chevytrucks.com/vboard/...7&postcount=30. I'll get a thread going on the truck soon. It should be arriving today. Ryan I'll definitely be picking your brain as I go forward and eally appreciate the advice. I'm totally clueless with diesel engines but eager to learn.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#7 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,395
|
Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Looks like the PMD/FSD was relocated. I think that’s what this module is anyway
![]() I started a project thread that I’ll add to as I go: http://67-72chevytrucks.com/vboard/s...d.php?t=821683
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() Last edited by DeadheadNM; 05-12-2021 at 11:52 AM. Reason: Added |
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#8 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
|
Re: I'm now in the diesel club w a 99 6.5L HO engine - help
Yes sir, it looks like it has been done already. One less thing for you to have to do.
__________________
Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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