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Thread: Coolant Leak , Front of Engine

  1. #1
    Registered User Foehammer's Avatar
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    Default Coolant Leak , Front of Engine

    Hey again guys, Ok here's my problem: My truck has developed a coolant leak that from the bottomm of the truck is dripping from between the harmonic balancer and the oil pan, could it be my water pump, or water pump gasket or the backing plate gasket, or could it be something else?

    My truck is a '94, and I have to remove every frickin thing from the front of the engine in order to replace the water pump, and gaskets, so should I replace the harmonic balancer, and secondary balancer(pulley) as well, while I am at it?

    I am going to be upgrading to a HO pump, and Heavy Duty fan/ Clutch combo, if I have to do all this as well, but do not want to fork over $600+ for the heath kit. SS diesel has HO pumps and fan upgrades for less than $400 combined, for both 94-99.5 yr, and 99.5+(with the screw on fan and pressed on pulleys), will the 99.5+ yr pump fit on my '94, or would I have to replace the backing plate?

    Does anyone have any experience with the SS diesel pumps/fan clutchs, and can speak to their quality?

    Or does anyone know what parts/ part #'s I should order from Rock Auto to do this job?

    Do I need to use a double T-stat setup or should I stick with the single T-stat?

    I have removed all my vac components witht the exception of the vac pump and will be leaving that off and getting a vac delete belt, any suggestions for that belt that are cheaper than the one Heath sells?

    I have replaced the plugs and injectors, done the upper plenum gut, and clean before, so would this be something that I could reasonably handle, and what kind of time should I set aside for this job?
    1994 K1500 Ext. Cab 6.5l TD Z71 4x4
    10.5" 14 bolt differential
    PMD remote mounted on heatsink in front bumper
    193k miles
    DS4-5521 injection pump
    "S" engine w/ gutted upper plenum and blocked EGR tower
    Custom Spectre Air Intake
    Heath Turbomaster
    Custom chip with EGR delete

    Guns don't kill people, mullets do

  2. #2

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    I would say its coming from your water Pump From your description, Dont wait too long before you fix it because its the bearing failing that is causing the seal to leak, as far as the belt on my 98 I needed a 99 1/2 inch 6 rib serp belt when I take off the vac pump, any auto parts store will have it, But yours is routed different so Im not sure of the length

    http://ptwiringsolutions.com/
    1998 Chevy 3500 6.5 4l80e 6X6 Dually
    AM General Military 6.5
    Relocated Grey and Black Stanadyne PMD's
    Bosch Duraterm's with PT Wiring Solutions GP Harness
    2/0 PTWS Battery Cables
    Walbro Pump and Racor filter My Feed the Beast
    Holset PDR HX35 turbo Banks Quick Turbo Housing
    Relocated airbox and battery
    Heath Max E Tork T+
    Tekonsha P3 Brake Controller
    High Idle Mod
    Relocated OPS W/ Bypass switch
    4" Diamond Eye Exhaust

  3. #3
    robzombie4551 robzombie4551's Avatar
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    X2^^^^^^^

    Water pump is the culprit most likely.. I have a 95 and use a k10106 belt with the vac delete,if that helps.

    I just replaced my pump last week with a 98 HO pump from rock auto. The bottom weep hole was leaking coolant on my balancer also, and the bearing was shot. The impellar is 5/16" bigger on the HO than our standard pump and the passages are also measurably larger. It only takes about an hour or so to change so don't procrastinate and get it done before the bearing locks up. BTW. I got my pump for 72.00 delivered to my door for a new lifetime warranty gates pump,that said delco on it and powder coated black. pt# 44042, and dmax fan,#1580690, and clutch #2831 but you can get it cheaper at advanc or AZ.

    Merry Christmas

  4. #4
    Registered User Foehammer's Avatar
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    Thanks for the replies guys and Merry Christmas!!
    1994 K1500 Ext. Cab 6.5l TD Z71 4x4
    10.5" 14 bolt differential
    PMD remote mounted on heatsink in front bumper
    193k miles
    DS4-5521 injection pump
    "S" engine w/ gutted upper plenum and blocked EGR tower
    Custom Spectre Air Intake
    Heath Turbomaster
    Custom chip with EGR delete

    Guns don't kill people, mullets do

  5. #5
    Just Another Diesel Guy Turbine Doc's Avatar
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    Before going after water pump another source that is deceptive is the heater quick disconnect on outlet of the T stat housing, it's pot metal and corrodes over time and also has "o-rings" in it to seal that become "square rings " over time and leak & weep down the side of the block looking very similar to the weepage that comes out the water pump "tell-tale" weep hole.

    Could be the WP but check the heater supply fitting as well.
    Last edited by Turbine Doc; 12-25-2010 at 05:04 PM.
    Tim (A-ACLU #29)
    98 (S)K1500,3.73 gear,4L80,Heath 4"exh,Amsoil air & bypass oil flts,Heath fan clutch,Stans Xover,pilar mtd BST/EGT/TRN,remote 12v fan tran cool,PML trans pan, PML diff cover, Hi pops, Heath PCM,Heath remote FSD, HDP Balance Flow, Heath lift pump, SSBC front calipers, EGR rear disc conversion, Goodrich brake lines, No-Slip locker, Roadmaster suspension, Lube specialist oil lines, Putnam lock & load hitch, A-team turbo.

    98 C1500 Burb Heath reflash,exhaust,ATT, Heath cooling system, Heath FSD

  6. #6

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    better read my poem if it's that...
    Advance gets about 200$ for the HO 2000 WP which is the best one. It will require a spin on clutch which the Hayden severe Duty was 150$ from NAPA.
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  7. #7

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    Quote Originally Posted by Turbine Doc View Post
    Before going after water pump another source that is deceptive is the heater quick disconnect on outlet of the T stat housing, it's pot metal and corrodes over time and also has "o-rings" in it to seal that become "square rings " over time and leak & weep down the side of the block looking very similar to the weepage that comes out the water pump "tell-tale" weep hole.

    Could be the WP but check the heater supply fitting as well.
    Good point I never thought of that

    http://ptwiringsolutions.com/
    1998 Chevy 3500 6.5 4l80e 6X6 Dually
    AM General Military 6.5
    Relocated Grey and Black Stanadyne PMD's
    Bosch Duraterm's with PT Wiring Solutions GP Harness
    2/0 PTWS Battery Cables
    Walbro Pump and Racor filter My Feed the Beast
    Holset PDR HX35 turbo Banks Quick Turbo Housing
    Relocated airbox and battery
    Heath Max E Tork T+
    Tekonsha P3 Brake Controller
    High Idle Mod
    Relocated OPS W/ Bypass switch
    4" Diamond Eye Exhaust

  8. #8
    Just Another Diesel Guy Turbine Doc's Avatar
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    Here are some pics of what I'm talking about, many replace with a common barb fitting, there is an aftermarket replacement steel fitting if you want to maintain the quick disconnect, some folks say the orifice in the OEM fitting is a requirement, both of my 6.5s have been "barbed" to no ill effect for years.

    On the aluminum heater hose side I used tubing cutter to remove the qd end and double hose clamped for sealing, it's 1/2" NPT to 5/8" barb fitting, it's 50/50 shot the GM q'd fitting will come out intact, some break off some don't so you'll want thread restore tools handy, when you remove old fitting. crossover will have to come off possibly so you can work the threads.

    Balance flow 10.JPGBalance flow 11.JPGBalance flow 8.JPGBalance flow 7.JPGBalance flow 27.JPGBalance flow 9.JPG
    Tim (A-ACLU #29)
    98 (S)K1500,3.73 gear,4L80,Heath 4"exh,Amsoil air & bypass oil flts,Heath fan clutch,Stans Xover,pilar mtd BST/EGT/TRN,remote 12v fan tran cool,PML trans pan, PML diff cover, Hi pops, Heath PCM,Heath remote FSD, HDP Balance Flow, Heath lift pump, SSBC front calipers, EGR rear disc conversion, Goodrich brake lines, No-Slip locker, Roadmaster suspension, Lube specialist oil lines, Putnam lock & load hitch, A-team turbo.

    98 C1500 Burb Heath reflash,exhaust,ATT, Heath cooling system, Heath FSD

  9. #9
    Registered User Foehammer's Avatar
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    Quote Originally Posted by Turbine Doc View Post
    Before going after water pump another source that is deceptive is the heater quick disconnect on outlet of the T stat housing, it's pot metal and corrodes over time and also has "o-rings" in it to seal that become "square rings " over time and leak & weep down the side of the block looking very similar to the weepage that comes out the water pump "tell-tale" weep hole.

    Could be the WP but check the heater supply fitting as well.
    Would this only leak after the engine was warm enough to open the T-stat?

    Ok I just saw your pics with the barb fitting , Thank you very nmuch for the info, will try to let my engine warm up, to see if this is the culprit, will let you know asap.
    Last edited by Foehammer; 12-25-2010 at 05:17 PM. Reason: Updated for additional psotings
    1994 K1500 Ext. Cab 6.5l TD Z71 4x4
    10.5" 14 bolt differential
    PMD remote mounted on heatsink in front bumper
    193k miles
    DS4-5521 injection pump
    "S" engine w/ gutted upper plenum and blocked EGR tower
    Custom Spectre Air Intake
    Heath Turbomaster
    Custom chip with EGR delete

    Guns don't kill people, mullets do

  10. #10
    Just Another Diesel Guy Turbine Doc's Avatar
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    Quote Originally Posted by Foehammer View Post
    Would this only leak after the engine was warm enough to open the T-stat?

    .
    Yup but not so much as when T stat opens as when there is enuff heat/pressure in system to let it weep past the square rings or rotten "pot metal" they make the fitting out of.
    Tim (A-ACLU #29)
    98 (S)K1500,3.73 gear,4L80,Heath 4"exh,Amsoil air & bypass oil flts,Heath fan clutch,Stans Xover,pilar mtd BST/EGT/TRN,remote 12v fan tran cool,PML trans pan, PML diff cover, Hi pops, Heath PCM,Heath remote FSD, HDP Balance Flow, Heath lift pump, SSBC front calipers, EGR rear disc conversion, Goodrich brake lines, No-Slip locker, Roadmaster suspension, Lube specialist oil lines, Putnam lock & load hitch, A-team turbo.

    98 C1500 Burb Heath reflash,exhaust,ATT, Heath cooling system, Heath FSD

  11. #11
    Registered User Foehammer's Avatar
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    Ok, I let the engine heat up and the leak showed on the ground, but when I popped the hood, and inspected the quick disconnect, no leak there ,so I guess I am back to having to replace the water pump, I have been trying to get an inspection mirror down on the bottom side of the pump to see if the weep hole is actually leaking or if it is a gasket, but I cant see anything down there. The only places that could cause the leak I am describing, are quick disconnsect on crossover, water pump weep hole, wp gasket or backing plate gasket, correct?
    1994 K1500 Ext. Cab 6.5l TD Z71 4x4
    10.5" 14 bolt differential
    PMD remote mounted on heatsink in front bumper
    193k miles
    DS4-5521 injection pump
    "S" engine w/ gutted upper plenum and blocked EGR tower
    Custom Spectre Air Intake
    Heath Turbomaster
    Custom chip with EGR delete

    Guns don't kill people, mullets do

  12. #12

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    headgasket but that is very very unlikely.
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  13. #13
    Recruit JMJNet's Avatar
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    Yes, I agree with TD. Check that quick connect on top. It is way up there and coolant can go anywhere before assuming the worst.

    It is an easy fix and more prone to leaking. It shows up during winter because the coolant does not evaporate as fast.

    I replaced mine last winter for good.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  14. #14
    robzombie4551 robzombie4551's Avatar
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    It's the water pump, and to rule all else out remove the belt and spin the pump and if you hear a grinding noise or if you pull on it and see/feel shaft play you know for sure.

    The by-pass usually leaks down the side of the block as coolant will travel to the lowest point on the under side of hose before dripping off.

    You say the coolant is dripping on the balancer,It's the pump and I gave you the part #s and it's not the spin on clutch type. it's for our trucks. 94-95 Go on rockauto.com and look it up as a 98 and look at the pic. Get the gates pump 72.00 to your door in three days /lifetime warranty and it's new not reman. I will stake my life on it just get the pump and be done with it. Ijust went through all this last week, good luck and post what is the problem after you confirm it so as to help others in the future who read the threads.

  15. #15

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    I would upgrade to the better WP. JMHO.
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