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#1
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Trying to track a coolant leak, '84 300D
450,000 km on car, Frybrid SVO kit installed.
Aux. coolant pump wired to come on with ignition. I've checked all my coolant connections that I installed with the kit and they are all dry. The water pump isn't making any noises. When the car is warmed up and then shut off, the leak is there sometimes and other times not. Some leaks are a few drips, other times I lose as much as 1/2-1 litre of coolant. The car doesn't leak when its running, only when shut off, and the leak stops after a couple of seconds, or as much as 10 minutes. Trying to find the location of the leak is dufficult. The closest I can nail it down to is from underneath, it drips from the passenger side of the crank area, dripping off the oil pan. Questions are is it the water pump itself or the gasket? And with the mileage I have, might I just replace the water pump anyways if the gasket is no good? Or is it something else? The water pump housing and associated clamps and connections appear dry. The belt driven fan appears to have blown some coolant around as well. Oh, and I had the leak before I wired the aux pump to come on with the ignition. Thanks Blaine |
#2
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With the engine cold, but after you notice the leak, feel under the water pump. Mine started leaking like that, with the same kind of drip. Turned out to be the water pump.
Also, if you have a hose in hose set up, if there is an internal leak, you may not see it at the fittings. Check your veggie oil for coolant contamination. Also, since you have the Aux Water Pump wired to run when the ignition is on, I hope you wired in a 1 amp fuse to protect other items ons the same circuit.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#3
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I'm guessing water pump. You might borrow a gizmo that applies pressure to the cooling system. Very handy for finding small leaks. You pump up a few pounds and walk away for a while.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#4
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Trying to track a coolant leak
water pump. same thing happened to me. It ran down along the oil pan before puddling.
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1980 300SD (Mr. Sparkles), 1976 450SEL, 1982 300D turbo, 1989 VW Cabriolet morphing into a td cabriolet , 1997 TDI Passat, 1996 piece of Jeep,1993 F150, 1990 F250 7.3L...i think that's it, for now. |
#5
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Quote:
I drove it several times today. After a 15 km drive, I parked it in the driveway(slight incline) facing downhill and it leaked at least 1/2 litre steady for 5-7 minutes. I replaced the lost coolant, then drove it the same distance 1 hr later, parked it twice in dry parking lots, and it didn't leak a drop when shut off. Both instances were in town driving. I guess when the system is hot and under pressure, something is letting the coolant out, I was just wondering if these symtoms I'm having are typical of a failing water pump,or its gasket. The water pump isn't making any funky noises at all. The mileage is higher and perhaps the increase in demand the VO kit has made on the pump, its decided to wave the white flag. What is this tool called to pressurize your system when its cold and where has anyone borrowed it from? It'd be easier dealing with coolant issues on a cold car rather than a hot one Thanks for the input Blaine |
#6
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I had a mystery leak in a small Ford. I know of a good service wrench that put an ultra violet die in the coolant ... two cracked head bolts in opposite corners! Good news was I intended to change water pump, belts ... that weekend so ... and $1300 later, back on the road. I had tried every trick before the die and no go.
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#7
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Look at the bottom of the waterpump with a mirror, there is a "weep hole"in the housing that lets the coolant drain out of the pump when the shaft seal goes bad, chances are it will keep getting worse, sometimes they will leak when the pump is turning, othertimes they leak when you shut it off
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