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! |
jk76.914 |
Sep 30 2011, 04:18 AM
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#2
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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'm overdue for an update...
Took the car in to EMS, and they had it for 2 days (2nd day mainly waiting for parts). Pressure test showed ROHAR was right about the plastic- there is a plastic outlet (or inlet?) flange on the back of the engine near the firewall that opened up under pressure. They replaced all of the plastic plumbing with new- both for coolant and for crankcase vents. Wasn't cheap, but I consider it high value because of the extent. I drove the car for a couple of days, and then delivered it back to my daughter. We're monitoring coolant level every couple of days, but so far so good. Still can't explain the wet plug threads. (IMG:style_emoticons/default/confused24.gif) |
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