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! |
cary |
Sep 9 2011, 09:22 AM
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#2
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest |
Another thought. You're probably already there at the shop. But after all was said and done fixing the aux water pump on the 2.7T A6. I had a leak in a new spot.
So OK what did I screw up? After digging around I found it. On the back of the head is the coolant sensor. Kind of an odd arrangement. Its held in place with a U spring gadget. Somehow while I was digging around all the hoses back there I knocked it loose a bit and it was dripping. Would have been more than a pint a month and its on the high pressure loop. |
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