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Old 03-24-2013, 02:09 PM   #1
Nikryj
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I took my car to the shop about a month ago and the mechanic said there was an external head gasket leak when he did my timing belt. I just did a compression test and the cylinders showed up 166 168 170 171. That seems a little high. I've had the hoses checked and they all appear ok. The mechanic couldn't find any leaks. It's a 2003 WRX with 110k miles.
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Last edited by Nikryj; 03-24-2013 at 09:11 PM.
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Old 03-24-2013, 02:14 PM   #2
boredazhell20
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How did your mechanic determine there was an external head gasket leak? Can you visually see oil or coolant coming out from the heads? How fast are you losing coolant? How did you determine the head gasket isn't the cause?
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Old 03-24-2013, 02:17 PM   #3
Nikryj
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There was a tiny white line of dried coolant on the block running down the head seam. I haven't stated it isn't the head gasket but with compression numbers so high, it doesn't seem like it is. I'm losing roughly an inch on the reservoir every 500 miles.
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Old 03-24-2013, 02:20 PM   #4
Haelan
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Quote:
Originally Posted by Nikryj View Post
There was a tiny white line of dried coolant on the block running down the head seam. I haven't stated it isn't the head gasket but with compression numbers so high, it doesn't seem like it is. I'm losing roughly an inch on the reservoir every 500 miles.
I've had coolant hoses only leak when running the engine hard. Specifically, the turbo's coolant lines. The spring clamps used there are notoriously weak.

Which side of the block was the dried coolant found?
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Old 03-24-2013, 02:24 PM   #5
Nikryj
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Passenger side, I'm going to take it to a different shop and have them check hoses. I can't find anything, possibly they can.
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Old 03-24-2013, 02:27 PM   #6
boredazhell20
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To test if the head gasket is not the issue I would suggest a leak down test to see if pressure is dropping from a certain cylinder.

Also try to see if bubbles are coming out of the radiator cap when the engine is running.
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Old 03-24-2013, 02:30 PM   #7
Haelan
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Originally Posted by Nikryj View Post
Passenger side, I'm going to take it to a different shop and have them check hoses. I can't find anything, possibly they can.
Pressure test the coolant system. Most auto parts stores have them for rent.
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Old 03-24-2013, 02:31 PM   #8
Nikryj
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I checked the top cap, no bubbles. I have no idea. I can't do a leak down test until next week so, I guess it's going to have to wait.
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Old 03-24-2013, 02:32 PM   #9
Nikryj
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Quote:
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Pressure test the coolant system. Most auto parts stores have them for rent.
Double post, yeah. That's what my buddy suggested. I'm about to leave for work, I'll update everyone tomorrow.
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