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12-11-2016, 03:48 PM | #45 | |
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12-11-2016, 03:50 PM | #46 | ||
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12-11-2016, 11:55 PM | #47 | ||
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12-12-2016, 02:05 PM | #49 |
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I have a similar issue with my Jetta TDI, think boost pressure is lifting the head slightly and pushing into the coolant. There's no coolant in oil or vise versa. I am going to try replacing the head bolts as it's likely the issue is that one or more has stretched in the 200k miles it has and hopefully avoid a head gasket job.
My cooling system holds pressure and leak is coming from the overflow... |
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12-12-2016, 02:44 PM | #50 | ||
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The problem is... coolant is under 1bar (max pressure) before the cap opens up. Engine oil is under 5bar(max). So... IF your head gasket is leaking... you will have oil in the coolant. Not vice versa. Btw... TDi's use stretch head bolts(I believe) so you will need new ones. And use a good quality triple square bit with a good tq wrench. I would change the HG is your gonna do new head bolts. But I think your problem is elsewhere. Use a pressure tester for the res cap AND cooling system(exp tank/hoses etc) for leaks. OP... that NAPA HG tester is better bc the fluid will change color when CO2 is introduced to the coolant. Using a CO2 "sniffer" might work. It also might not... especially since you only have this coolant leaking problem under heavy boost. Dack
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12-12-2016, 07:42 PM | #51 | |||
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12-12-2016, 11:00 PM | #52 |
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Iv read most shops will be 100% without a doubt certain if they read anything over 100 ppm Of HC... can anyone get me torque values for reassembly..? Or does anyone know of a write up, i have SEARCHED but it seems im the only person trying to pull their N55 cylinder head off....
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12-13-2016, 01:25 PM | #53 | |
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12-13-2016, 01:58 PM | #54 | |
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I would also replace the oil filter housing gasket and de-carbon the head/valves while the head is off the car. And take a good look at the valve cover bc those can develop cracks. OFH gasket DIY... http://www.e90post.com/forums/showthread.php?t=476419 You might check over on the e90post.com forum. But I tried a few searches and did not come up with any DIY threads on head gasket repairs. Good Luck, Dackel PS: Please keep us updated. We all can learn from this tough situation.
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12-13-2016, 04:18 PM | #55 |
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Well I've had to deal several times with blown head gaskets. This video is a little long winded, but the guy points out that fixing the problem may involve more than replacing the head gasket. It could be a warped block or head. Maybe a bad or cracked valve or ?
I suspect this engine has been run very hard, and maybe tinkered or tampered using after market performance junk like a JB4. According to the owner, if he drives it sanely, there doesn't seem to be any problem, or at least it isn't blowing any coolant. He could likely trade it off to an unsuspecting dealer for another car. It may very well be the way to go depending upon how much your conscience might bother you. My own experiences were very expensive mainly due to old German cars. I had to have both the block and head resurfaced and all the valves and seats replaced. I had to pull the engine and tear it down. What I'm saying is the repair may involve more that pulling the head and replacing the HG. That's why my philosophy is to enjoy the car but don't flog it every chance you get unless you have very deep pockets. |
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12-13-2016, 05:53 PM | #56 |
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If I had a blown head gasket issue, I would at a minimum, have the head checked at a machine shop to ensure the mating surface is fine. The extra check to me is money well spent to ensure piece of mind. As going back in again isn't a simple matter in terms of all the labor involved.
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12-13-2016, 06:07 PM | #57 | |
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12-13-2016, 08:14 PM | #58 |
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If you replace the head gasket and end up having the head resurfaced Bmw has thicker head gaskets to make up the difference (this way you don't end up increasing the compression). There are specific specs on how much material to remove etc... if the gasket is blown then If say chances are the heads warped
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12-13-2016, 08:33 PM | #59 | |
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Its looking like the dealership (not bmw) may actually take some steps to help cover the costs! They asked i bring a quote and a statement from bmw (even though i already diagnosed the problem) what the problem is and how much it would cost to fix if: 1. The head gasket only needs to be changed (plus machining where required ) 2. The head needs replacement 3. The block needs replacement
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12-13-2016, 08:34 PM | #60 | ||
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12-23-2016, 03:57 PM | #61 |
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Bmw is trying to tell me i have a stuck thermostat :/ they said they found a similar bmw tested at idle ran 8-10 degrees cooler than my car :/ is that seriously the conclusion they're going to draw? It sounds like they're just throwing parts at it cause no one wants to believe a head gasket/crack somewhere :/
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12-23-2016, 05:15 PM | #63 |
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Even with the car only ever hitting 95 degrees C while driving it hard? Only once i let off does the temperature rise up to 112 degrees C?
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12-24-2016, 12:16 PM | #64 |
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Here is what they gave me... they tried to tell me i needed a water pump, i told them iv already looked into that and its not the case. They came back and said oops never mind, it stored a code because the coolant level was low and the pump actually doesn't need to be replaced :/
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