924Board.org

[timstar92404]

I've noticed a couple of times that when my car sits undriven for a day or two and I come back there is coolant under it.

less than a month ago I replaced all the hoses got a shop to do a compression test of the cooling system and they said there were no leaks after they tightened up hose.

Now I keep on seeing this coolatn under the water pump area and running down past the fender. My cooling system is a tiny bit over the maximum level, I accidently overfilled it., I haven't seen it leak while running but after it sits it somehow leaks.

today I took a light and looked at the leak and saw that coolant was running down the big hose going from the radiator to the water pump. the hose on the water pump is pretty tight I can't see how coolant would come out of there especially when the car is shut off.

only thing I can think of is the water pump seep hole is leaking.... But I replaced the water pump with a new one a year ago and I have barely driven the car

that's pretty lame if the water pump starts leaking that fast. but they are cheap (70 bucks) and easy to replace.

also is it bad for the cooling system to be overfilled a tiny bit. Its hard to drain just a tiny bit by taking the rad plug out.

even after these couple of leaks I have seen which make a nice puddle the coolan is still a bit overfilled...
_________________
78 924 sold.
85.5 944

[Mike924]

So long as there is a reasonable amount (about a third, say) of air in the expansion tank, it doesn't matter if the coolant level is above the 'KALT' (cold) line.

The radiator hose where is joins the the water is exposed to oil seeping (as opposed to leaking) from the oil pump. This softens and expands the rubber so that, even when the clamp seems tight, water can get past the joint.

Another thing that can leak, as you rightly surmise, is the water pump. Did you seal the gasket properly? Is it leaking from the shaft seal? ... the weep hole? Clean it up and see if you can tell.

If coolant is escaping, but the level in the tank isn't going down, it sounds like you might have air lock. Suspect a stuck or clogged thermostat.

What about the coolant leak you had around the back of the head. Did you fix that or did it just go away?
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[timstar92404]

ok the coolant leak at the back of the head was bad and I just tightened the coolant flange really tight (the screws are very had to turn even though I cleaned them and added lube, I tought they were going to break if i kept on tightening them).

anyways after I tightened them the car would not start anymore so it was towed to the shop where they reset my timing (distributer was in wrong) and they did a coolant system pressure test adn found two hoses that were leaking not sure which one but supposedly one of them is suppose to be the U shaped one on top with the red cap that has a clamp on it.

I don't see coolatn leaking from the back of the head anymore. that was a bit further back. Now its more to the front of the engine and I could clearly see the coolant still running down the hose to the water pump.

it's too hard to see the weep hole without removing the pulley and then its still hard to tell if it came out of the weep hole.

I'm pretty sure I tighened my water pump correctly -theres even silicone gasket sealant all around and I used a cheap dial style torque wrench to torque the bolts.


how do I bleed out the air, if there is air. Do you just remove the red plug on that U hose and run the engine until coolant starts gushing out?

theres a problem thought the red plug is fused to the hose, i couldn't get it out , if I keep on pulling I"ll probably rip it.
_________________
78 924 sold.
85.5 944

[Mike924]

[ATL_racer]

i had the same thing, the weep hole on cheap water pumps leaks when the bearing goes. My "brand new" "cheap" water pump leaked through the weep hole the first week, i re-sealed the pump 3 times, each time it leaked. So i finaly bought a more expensive oem refubished pump, much better quality and no leaks.
_________________
late 1979 porche 924, red 2.0l NA 5speed snailshell
Plans: Restore exterior, revitalize interior, install killer sound system, run engine in stock form and have fun.(+ a short throw shifter if i can find one)

[Dans931]

An alternative method of bleading out the air. Make sure the car is cold, parked level, and the coolant topped up. remove the pressure cap and loosen the bleader screw. Wipe off where the cap screws on, take a deep breath and blow air into the tank. You will hear air escaping from the screw. When coolant appears, close the bleader screw. Do not overtighten like I did. These hollow screws can break. When mine broke, I used a short fine thread 8mm bolt (M8X1.0X20) and a copper washer as a repair.
Daniel

[john h]

Unless someone has modified your car - only the turbo's had the hollow bolt.
Tim's car is a non turbo and has a rubber hose from teh thermostat housing to teh header tank in front of tehengine. this hose has a small outlet with a red plastic bung to bled the air.

These hoses are really expensive in NZ (last quote over $100) and I didn't buy one when mine burst on the auto 924 (I only paid $500 for it so I wasn't going to spent 20% of it's value on a hose, especially since I'm going to be parting it out later this year) To bled the system I just parked it on the drive to my garage then jacked the front up even higher and then filled the cooling system through the header tank and ran the car till the thermosat opened and then cracked open the hose to the thermostat till some water was coming out. This seems to have got rid of the air in the system..
_________________
Remember a Porsche is not just for Christmas,

if you take it to pieces slowly it can provide anguish all year long!

[Mike924]

[timstar92404]

well the hose to the water pump looked a bit loose so I tighened it up but I still see leaks after it is parked.

I tried bleeding the air out I took the red plug out and ran the engine with the coolant tank cap installed and coolant started coming out of the bleed hole like 1 minute after I started the engine and was just gushing out and going all over my belts so I installed the plug again and shut off the engine, I still didn't see the coolant going down...... not sure if that means there is still air pockets in the system ....

are you suppose to let the engine warm up to operating temp (over the white area?

my leak looks like it is coming out of the hose where it connects to the water pump I could be wrong thought maybe my water pump is leaking again. I paid 70 bucks for the water pump the brand is Graf, Altrom , it says it has a 45,000 km warranty but I never filled out the warranty paper to send it in.
_________________
78 924 sold.
85.5 944

[Mike924]