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Thread: GM replacement engine

  1. #1
    Join Date
    May 2006
    Posts
    10

    Default GM replacement engine

    I have just been told I have a cracked block on my 94 6.5T engine. I was getting coolant in my oil so the shop pulled the heads thinking the problem was heads or gaskets. Both were in good shape. I have read that 1994 blocks were prone to cracks but i understand new 6.5 engines from GM have that problem solved. I am considering buying new engine from GM. it comes with 3 year /100000 mile warranty. Dealer indicated that new engine has different metal in casting. Has anyone had good luck or information about 6.5 engines offered by GM lately?
    1994 2500 4x4
    BD powerchip
    B&K shift kit

  2. #2
    Join Date
    Oct 2003
    Location
    Huntington In
    Posts
    1,367

    Lightbulb

    Check around first. Look into the DP Advertisers and call them. Ron Schoolcraft (RJ) has by far the best 6.5 build. www.kenndeydiesel.com has the best GM short block replacement. Gm short block replacement can be costly.
    95C3500.Ext.Cab 97 Cooling mods. DSG Gear-1.95 TDCO. Bilstein Shocks. Firestone Air Bags. FSD Cooler. Banks EX System. Egt,Boost & IAT Gauges. JK High Flow/pop Injectors. Turbo-Master. Max-E 2.0. Water/Alky Injection. Amsoil Dual Bypass. Baldwin filter. aFe Air filter, Air box & Turbo Mods. Power Service Product. Large Duels 235/85-16. Tool Box\'s & truck, 8200 lbs.

  3. #3
    Join Date
    Sep 2001
    Location
    Lubbock TX, USA
    Posts
    4,194

    Default

    Actually, if you've got a true 94 engine, it's less likely to be a cracked block than the later engines.

    Does this truck have a goodwrench replacement engine in it already? Since you have a lot of it apart, mind posting the casting number off the block? The number is located on the rear of the engine on what would normally be the driver's side, below where the heads mount.

    Coolant in the oil is usually a cracked block, but usually associated with the later casting of blocks. But cylinder walls still do crack on these block due to heat, usually the back two #'s 7 & 8, and possibly #6.

    Might check with several dealers in regard to a new engine. Some dealers have a discount parts department and can actually get you a decent deal on that new GM crate engine.

    Of course, if you're looking for more, you can go with a performance reman from one of the venders.

  4. #4
    Join Date
    May 2006
    Posts
    10

    Default GM diesel replacement

    Yes the engine has already been replaced with a GM engine while it was under warranty. The records from the previous owner show it was a 1996 engine that was installed. I will look for the engine number when I go to the shop that has the truck. I can buy a new GM crate engine long block(at least that is what they call it. Engine with heads but no intake manifold for 8300 CDN. List price showed as 10600. I am hoping new GM crate engines are better than the 1996 one they put in. Indications from GM dealer is that new engine has new part number and is suppose to be better block material. GM mechanic I spoke to said he does not see many problems with these new engines.
    1994 2500 4x4
    BD powerchip
    B&K shift kit

  5. #5
    Join Date
    Sep 2001
    Location
    Lubbock TX, USA
    Posts
    4,194

    Default

    Before the mechanic installs it, verify that it's not old stock.

    The better blocks will have Diamond Emblem cast in the "V" of the engine, it's the Navistar emblem. No Diamond Emblem, then don't let them install it or pay for it, it's not the enhanced block.

    I'll bet your "cracked" 1996 is really a 1997 '506 block.
    1982 C10 SCSWB 6.5TD, mods too extensive to list. (13.69 1/4 mile @94.6 MPH) RACE TRUCK
    1982 C10 SCSWB 6.2NA, 2.73 700
    1986 C10 SCLWB 6.2TD 3.73 700
    1989 V20 SUB 6.2NA, 3.73 400
    1994 G20 VAN 6.5NA, 3.42 60E
    1994 K20LD ECSWB 6.5TD, 3.42 80E
    1995 K20 SUB 6.5TD, Wrecked, ran into by stupid teen.
    1995 C3500HD DRW 6.5TD, 12' Flatbed 5.13 80E
    1995 C3500HD DRW 6.5TD, 18' Rollback Wrecker 4.63 80E
    1994 C20HD ECLWB 6.5TD 3.73 80E Wifes Truck.
    1995 C20LD ECSWB 6.5TD 3.73 80E
    1995 K20LD SCLWB 6.5TD 3.73 80E
    1996 K30 DRW 6.5TD 4.10 80E
    1997 C10 Tahoe 2Door 2WD 5.7L to 6.5 Conversion Underway

  6. #6
    Join Date
    Jan 2002
    Location
    Trenton, Ohio, USA
    Posts
    71

    Default Need an Engine?

    Don't forget to check with Peninsular Diesel for your replacement. After touring their facility at the rondezvous this year, and seeing what General Engine Products is doing for them, it would be a no brainer to me.

    I have been where you are with my '97 and it is no fun.

    Check with Peninsular!
    Jeff

    97 Chev K2500HD 6.5l/4L80E TD Ext. Cab
    2000+ AMG Block w/18:1 Mahle Ceramic Coated Pistons - Balanced, DSG HO Injectors, Heath Computer & Boost Control, Kennedy FSD Ext. Harness, Phazer Gear Drive, 4" BD Exhaust w/Downpipe, K&N Air Filter, Isspro Gauges

  7. #7
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    Another option is to dig up a buildable 92,93, 94 599 block and freshen it.
    The 599 Blocks were pretty good it seems. I have two with over 200K on them. I just rebuilt one that lost a head gasket at 247K and it is back doing its job now.
    Just a thought
    Robyn

  8. #8
    Join Date
    May 2005
    Location
    SE Wisconsin
    Posts
    488

    Default

    I would also recommend checking with Peninsular. I installed one of their 18:1 engines in my K3500. They are great to work with, good customer service.
    1993 K3500 - Peninsular 18:1 engine, marine injectors, high capacity cooling, AL Core Radiator, 3" DP and 4" exhaust, ISSPRO Gauges, Girdle, AMSOIL Dual Oil Filter System, 1997 Air Filter(trashed the K&N), 395K on Body, 165k on engine.
    1997 GMC Savana - 6.5 TD
    1966 CJ5 - V6 Gas - highly modified
    1967 Jeepster - Stock
    1986 Jeep CJ7 - Stock
    1993 Grand Cherokee - 6.2 diesel
    2007 Grand Cherokee - 3.0 diesel

  9. #9

    Default

    If you are looking at the dsg motors in saskatoon I think you are better off to buy state side. It will still be cheaper to buy from pennisular or someone else then paying there price. dsg does claim to have the new blocks that are high nickel but I have heard that they may not be. So basically shop around alot before you make your purchase because there are lots of places to buy from.

  10. #10
    Join Date
    Nov 2002
    Location
    Martinsville, IN
    Posts
    3,163

    Default

    If you're interested, check this option.

  11. #11
    Join Date
    Dec 2002
    Location
    GRAND RAPIDS, MI
    Posts
    23

    Default

    I opted to go with a Peninsular Engine this past Spring when my block cracked. I liked the idea of the 18:1 over another GM stock motor. It runs like a dream and Matt at Peninsular is a guy you can trust. His warranty is not as good as the GM warranty but I wouldn't let that scare you.
    99 SUBURBAN LT 6.5
    PENINSULAR 18:1 Motor
    Westers ECM
    Intercooler
    Heath Remote Mount PMD
    SS Diesel Air Filter System
    '02 HD Wheels
    Lube Specialist Braided Oil Cooler Lines
    Isspro Pyro/Trans/Boost Pillar Gauges.

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