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E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #21 of 71 Old 17th January 2017, 02:15 AM Thread Starter
ninjabmw
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The power is still there to be honest since i dont really drive the car aggressive i can still feel the power being there. By saying expensive how bad is it? $4-5000 in parts because the clutch and smg is brand new.
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post #22 of 71 Old 17th January 2017, 02:39 AM
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If you get a Troy-rebuilt engine you are look around $10k. But have an expert look at it. Sorry man. It really sucks.
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post #23 of 71 Old 17th January 2017, 03:01 AM Thread Starter
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So by changing the piston rings and rod bearing the compression wont be back on that cylinder?
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post #24 of 71 Old 17th January 2017, 03:05 AM
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No, that cylinder is probably toast. Scorred, etc. Best bet is a rebuilt engine.

2008 M5 SMG
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post #25 of 71 Old 17th January 2017, 03:25 AM
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Could be as easy as a valve spring. OP, try a "wet compression check" by putting a couple of ounces of oil in the spark plug hole on that cylinder and seeing if compression increases. If so, the problem is likely the bottom end (ring/cylinder wall). If it doesn't change at all, it's likely the top end and could be a valve or spring.
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post #26 of 71 Old 17th January 2017, 03:55 AM
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Blue smoke while reving

But what explains the oil on the spark plug? If it was just a bad valve spring, I agree no compression. But there should not be any oil in the chamber?

Put a borescope down the spark plug hole and look. Make sure the piston is at BDC.

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post #27 of 71 Old 17th January 2017, 04:41 AM Thread Starter
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jcolley thanks for the reply. I will do the oil test tomorrow in the morning. And to answer RT it actually was carbon on the spark plug when i put a boroscope to look at it there was no marks of oil on that cylinder and it was build up carbon. All the cylinders actually had some type of build up carbon on it. I dont think that the cylinder is toast nor the motor because everything functions normally besides the oil consumption. Test will tell tomorrow i will keep you guys posted on this journey that i am having with this car.
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post #28 of 71 Old 17th January 2017, 08:27 AM
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Blue smoke on decel- valve guides/valves
blue smoke while revving- rings
A compression and leakdown test for $200 will tell you all you need to know

Sent from my STV100-2 using Tapatalk
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post #29 of 71 Old 17th January 2017, 03:39 PM
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Unfortunately the comment about cleaning any CCV related anything won't help. You mention #5 being caked with burnt oil and no compression. This may sound odd but try doing the "wet test" with some Marvel Mystery Oil. put some in the cylinder to see whether or not that "loosens" up your rings to the point of sealing with block. Only thing is that test will take a few hours in that the oil needs time to loosen up what ever may be stuck.

As far as CCV is concerned, there is a website called realoem.com and depicted there are any and all diagrams of what's related to any BMW so you can look at pictures and decipher your next plan of action.
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post #30 of 71 Old 17th January 2017, 04:19 PM
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Low compressor on that cylinder, something is dead. Rings, valve, spring.

Do a leak down test and you should know for certain.
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