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Old 10-09-2007, 03:29 PM   #1 (permalink)
jeffjbar
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Signs of Blown Head Gasket

What are some signs to look for to know if you have a bad head gasket. I know some of the obvious, coolant loss, coolant in oil, etc. But I am wondering if there is anything to look for on a routine basis to see signs of a small problem, before it turns into a big one.
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Old 10-09-2007, 04:36 PM   #2 (permalink)
instarx
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White smoke when engine is cold (water in cylinder causing incomplete combustion)
Coolant smell in cold exhaust
Engine sometimes "binds" when starting (hydrolock in cylinder)
Exhaust bubbles in coolant tank when engine is running (cylinder blow-by into coolant system)
White water blobs on dipstick (small water leak into oil)
Oil level rises (big water leak into in oil)
Coolant pressure bleeds off overnight (leaks out through blown gasket)
Coolant running onto ground when engine is hot (blown out of coolant tank)
Loss of fuel economy, rough running, vibration, noisy (cylinder compression being lost)

Not all of these happen all the time, but all can be symptoms of a blown head gasket. Personally, my blown head gsket eventually caused 1,2,3,4,7,8,9. but started with 1 and 3.
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Old 10-09-2007, 11:52 PM   #3 (permalink)
midniteplowboyy
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Mainly check your coolant level, if always at the same level, your probably good to go, you could have slight(very slight) compression leak and it might not blow any water out, as mentioned above check for bubbles idling, but if your seeing bubbles your probably already blowing water out the overflow.

Also make sure your low coolant light works, its your friend, my 93 did not work, now I'm paying for it.

You dont know where a good place to buy replacement heads do you, mines cracked?
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1993 6.5TD 3500 2x4 4L80 3.21's 4door, Play Truck, mods below
1994 6.5TD 2500 4x4 4L80 3.73's reg cab, The Feed Wagon, Max-E-Tork, Flowmaster DP, straight piped, manual GP overide, posi-lock actuator, 3" body lift, flat bed, trip hopper feeder, remote hydraulics, hay spear and bale cam.
2004 6.6TD 3500 4x4 Allison 3.73's 4door, Towing Truck, Ranch Hand brush gaurd and rear bumper.

WH1C Holset Turbo, 24x12x4 I/C, 4" Exhaust, 0.010 thicker Head Gaskets, ARP Head Studs, Pete Jackson Gear Drive, Fluidampr, Marine Injectors, HO Water Pump, Amsoil Bypass Oil Filters and Air Filter, fuel filter housing mod with 3/8" fuel lines, Gauges(Pyrometer, Boost, Fuel Pressure, Water Temp in each head, Oil Temp, Trans Temp and Trans Pressure), BD Torque Converter, Transgo HD Shift Kit, 3.21 gears, U.S.Gear Underdrive, rear Air Ride,22" Alcoa's and 305/40 Tires.

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Old 10-10-2007, 12:03 AM   #4 (permalink)
midniteplowboyy
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If yours holds true to two of mine, mileage wise you have about 150k left, time wise between now and the next five years.

Both of mine had around 200k on them when they went, my 94 has 192k so will see if that holds true for the third, but someone might have already replaced them before me, my 93 blew about a month ago right at 200k, 199,6??miles showing(almost made it,lol. My 92 blew prolly 5-6 years ago.
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1992 6.5TD 2500 4x4 5spd 3.42's reg cab, Farm Truck, mostly stock(if it aint broke dont fix it)
1993 6.5TD 3500 2x4 4L80 3.21's 4door, Play Truck, mods below
1994 6.5TD 2500 4x4 4L80 3.73's reg cab, The Feed Wagon, Max-E-Tork, Flowmaster DP, straight piped, manual GP overide, posi-lock actuator, 3" body lift, flat bed, trip hopper feeder, remote hydraulics, hay spear and bale cam.
2004 6.6TD 3500 4x4 Allison 3.73's 4door, Towing Truck, Ranch Hand brush gaurd and rear bumper.

WH1C Holset Turbo, 24x12x4 I/C, 4" Exhaust, 0.010 thicker Head Gaskets, ARP Head Studs, Pete Jackson Gear Drive, Fluidampr, Marine Injectors, HO Water Pump, Amsoil Bypass Oil Filters and Air Filter, fuel filter housing mod with 3/8" fuel lines, Gauges(Pyrometer, Boost, Fuel Pressure, Water Temp in each head, Oil Temp, Trans Temp and Trans Pressure), BD Torque Converter, Transgo HD Shift Kit, 3.21 gears, U.S.Gear Underdrive, rear Air Ride,22" Alcoa's and 305/40 Tires.
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Old 10-10-2007, 09:05 AM   #5 (permalink)
irelandd
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Send your oil to blackstone labs. The will be able to detect small amounts of sodium and potassium easily and compare it to other 6.5 engines.
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