Is my Audi A4 head cracked? What to do?, Last update. 10/13. Spewing coolant. |
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Is my Audi A4 head cracked? What to do?, Last update. 10/13. Spewing coolant. |
jk76.914 |
Sep 5 2011, 07:27 AM
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#1
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Senior Member Group: Members Posts: 809 Joined: 12-April 05 From: Massachusetts Member No.: 3,925 Region Association: North East States |
I may be in a pickle. My daughter's 2004 Audi A4 1.8T, 105,000 miles, was using some coolant. I looked and looked and looked, there was no evidence of a leak. It used about a pint every 500-1000 miles, so I thought there should be some visible sign, but no. There's no symptom at all. Nothing wet, driveway dry, no smoke, starts good, runs fine....
But then yesterday, after topping it off again, I changed the plugs. The threads on the #4 plug were wet. The other three not. I'm guessing a crack from the plug to the water jacket somehow, and it probably opens up at temperature, seeping coolant into the combustion chamber. What do you guy's think? The wet threads seem to confirm the diagnosis... Any other ideas? Anybody know if these things are prone to cracking? Any danger in trying a Bars Leaks sealant? They're pretty well regarded, I think, and they have four products for cracks, head gaskets, etc... I'm thinking of trying the mildest first. She commutes from Boston to Rhode Island daily, putting about 400 miles on the car every week. Here's a picture of the 5 valve combustion chamber I found on line. Lots of opportunities here for cracks... Help! |
brant |
Sep 6 2011, 06:12 PM
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#2
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I HATE all "stop leak" or "head gasket in a can" type products
do not pour that crap in your engine please if you do you will likely be soon replacing your heater core, all water lines, cleaning out the solid tubing water lines, new radiator, and then new head. I recently did a head gasket job where the owner poured that crap in to fix a bad head gasket. All of the passages between the block and the head were completely sealed. Guess what happens when NO water gets to the head on an water cooled engine. Its a fun way to warp everything! don't use the late night TV products. They are a sham... snake oil... (and not the good kind of snake oil that Jake sells) check the exhaust pipe while running. You might find the motor is burning the coolant off. That could foul out or cause a wet plug. Shine a flashlight into the spark plug hole. If all of the carbon build up is cleaned off of the piston and its shiny clean, that is a sure sign your burning coolant. brant |
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