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! |
r_towle |
Sep 7 2011, 08:32 AM
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#2
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Custom Member Group: Members Posts: 24,585 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
go to EMS..tell Michael that Rich Towle sent you...he is an old and dear family friend.
He can hook up a pressure test to the coolant system with the plug out....pump it up without the motor running and spray coolant out if there is a leak... That is the simple and quick test if you have the proper tools, which he does. He loves audis, so he knows his stuff. Rich |
jk76.914 |
Sep 8 2011, 03:57 AM
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#3
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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 |
go to EMS..tell Michael that Rich Towle sent you...he is an old and dear family friend. He can hook up a pressure test to the coolant system with the plug out....pump it up without the motor running and spray coolant out if there is a leak... That is the simple and quick test if you have the proper tools, which he does. He loves audis, so he knows his stuff. Rich WOW!! What a great lead!! I'm stopping by this morning on my way to work. I go right down I-495 on my way to Lexington, and he's right off 495 on 28. I'll report back. Thanks again guys (especially Rich)! Jim |
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