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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-17-2016, 10:12 AM   #1
sharpx
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Join Date: Aug 2009
Location: Chicago
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Manual rotation of crankshaft, stalled while driving

Car stalled while driving; starter will not turn over

When turning crackshaft manually with wrench, there is about 3 inches of serpentine belt movement either direction til stop (clockwise and counter-CW) with 100+ ft/lbs force applied.

Should the crankshaft normally be able to rotate clockwise endlessly?

Automatic Transmission
2005 M54

At this point I have not ruled out:
  • hydrolock
  • valve(s) bent
  • timing chain

DISA valve is intact
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Old 02-17-2016, 12:38 PM   #2
Gus-CO
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It should turn with much less than 100 ft/lbs.

You would feel little "bumps" when a piston is compressing, that would be maybe 70-80 ft/lbs...

If the car was driving and I assume that you weren't driving on high waters it can't have hydrolocked. There is no time for fluid to get into the cylinder to hydrolock. At least not if a great smoke cloud hasn't been coming through you exhaust for several seconds.

How many miles? Any engine mods? Were you driving hard when it stalled?

Driving hard could have dropped a valve, especially if there is any mod to allow for higher RPMs.

Many many miles could have the chain guides or tensioner failing. that's unlikely since before failing you would probably hear a very bad noise and have poor performance for several hundred miles.

Funny that having dropped a valve you would be able to turn almos a whole turn by hand before hitting the valve, unless the whole valve is actually now inside your cylinder, which is possible....

Do you have an inspection camera? If so wtick it through the spark plugs holes and try to find something, otherwise you'll need to take the cams out. And then will need special tools (available for rental) to put them back in.
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Old 02-17-2016, 01:06 PM   #3
sharpx
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Quote:
Originally Posted by Gus-CO View Post
It should turn with much less than 100 ft/lbs.

How many miles? Any engine mods? Were you driving hard when it stalled?
109k miles
No mods (original apart from new plugs/tensioner/pulley/coolant pump)

Car was moving at idle speed through parking lot
Stalled 60 seconds after start-up

Cold engine; outside temperature was 5 F.

Something is blocking crankshaft rotation with more than 100+ ft/lbs force.
The starter cannot break through the resistance either.

I will be removing the valve cover and plugs today to look into the cylinders. Also removing starter (starter/flywheel jammed?)
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Old 02-17-2016, 03:37 PM   #4
Gus-CO
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If you have an inspection camera you don't need to remove the VC, just the plugs... If you don't, then you need to take the cams out...

Removing the starter will be quite a bit of work. I don't believe the problem is there otherwise you'd hear the catching noise when trying to turn the engine...

Hope it isn't anything too bad, but it definitely doesn't look too good either....
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Old 02-17-2016, 08:20 PM   #5
sharpx
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Upon removal of spark plugs, many cylinders are loaded with oil.

Crankshaft now turns with minimal effort.

Hydrolocked due to failed CCV.
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Old 02-18-2016, 09:16 AM   #6
Gus-CO
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Wow!!!

That's good news! It's going to be a $100 job, not a $700 one!

I am sorry. I had no idea a CCV could fail to that extent without warning. Maybe because the engine was cold you couldn't see any oil smoke coming through the exhaust before it failed bad.
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