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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > n52 compression test issue



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      02-15-2013, 02:01 PM   #1
pepsih
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n52 compression test issue

Today, my brother did a compression test on his E90 325i EU version.
so here are the results.

CYLINDER 1: 15bar(around 220lbs) spark plug clean
CYLINDER 2: 14bar(around 209lbs) spark plug dirty
CYLINDER 3: 15bar(around 220lbs) spark plug little smoked
CYLIDNER 4: 15bar(around 220lbs) spark plug clean
CYLIDNER 5: 14.3bar (around 210 lbs) spark plug clean
CYLIDNER 6: 15bar(around 220lbs) spark plug clean

What should be the correct pressure on the cylinders?
( the engine was preheat before the mesurements)



Cylinder 2





Cylinder 3






Cylinder 5


/
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      02-15-2013, 07:42 PM   #2
e90pilot
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I'm not sure what it should be exactly but that looks good. How many miles?
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      02-15-2013, 09:29 PM   #3
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the car has around 67k miles (107k km)
the problem actually is that he has to add a quart of oil every 400-500 miles!
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      02-15-2013, 10:17 PM   #4
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Either a leak or valve guide. That's a quite a lot of oil!
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      02-15-2013, 10:24 PM   #5
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Definitely not a leak.
The car is going to the shop probably on sunday.
we'll see
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      02-16-2013, 10:15 AM   #6
volkswackin
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Your sure its not a leak? I've never had an oil consumption issue on an n52...ever...even ones will over double those miles.
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      02-22-2013, 06:10 PM   #7
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thats quite a bit indeed! He should be seeing plenty of blue smoke if its the valves or blow by.

Could it be a faulty head gasket (doubtful based on the pressure test results).

It could also be a faulty oil water separator this was pretty common with the M54 engine.
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      02-22-2013, 06:18 PM   #8
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dang that looks bad no matter what it is... I recently changed my plugs at 100k miles and did not look nearly as that... Keep us posted.
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