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Vanos gear inoperative

465 Views 23 Replies 3 Participants Last post by  platii
Currently, I have completed s85 m6 engine disassembly assembly. However, when the vanos system test is performed with ista, the maximum stop position and the minimum stop position are abnormal. Is there a solution to this? The vanos gear, camshaft and crankshaft timing are correctly aligned. However, the alignment of the bolts with the washers of the vanos gear is suspected. Can anyone give me a solution?
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Discussion Starter · #6 ·
Yes wrong Vanos/gears timing, also the exhaust cam gear lost its initial timing, the exhaust cam gear initial timing must be set and the screws with washers are tightened before installing and tightening the central bolt to fit them to the camshaft. The intake camshaft is the same as the exhaust gear but it is easy to set, the exhaust cam gear required force to set the screws with washers if it lost its initial timing position. This happened because you didn't follow the correct procedure during removal. Especially the exhaust gears are under secondary spring force.

All screws with washers must be set and tightened after turning the sleeves to the right side and the screws move toward the left side BEFORE installing the camshaft central bolts.
All camshafts central bolts and screws with washers must replaced with new ones.
View attachment 970424

Read here:

And here:

I think Vanos bleeding and bad solenoids is a secondary action. You can watch my video during first startup after timing, look how the Vanos is following the DME nominal values without Vanos bleeding.
All vanos bolt positions have reached the left maximum stop position. There is no more movement in that part.
 

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Discussion Starter · #7 ·
Try 5. Those zero ms readings tell you they're not responding. Also make sure solenoids are properly connected. Red wires exhaust solenoid.
All solenoid connectors are well connected. It all seems normal if vanos adaptation is denied. However, when the vanos system test starts, all of them return to abnormalities.
 

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Discussion Starter · #12 ·
Are they original or after market.

With camshaft central bolts installed and tightened or before?.
Those picture at what installation stage, removal, prior to installation (ready to install)?.
The vanos gear had already been aligned prior to installation on the camshaft.

and After Market Solenoid Valve
 

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Discussion Starter · #21 ·
The Vanos gear is set to maximum position and tightened to 10nm BEFORE you install the central cam bolts.
After you install the central camshaft and you loosen the screws with washer 90° before you fully insert the Vanos adjuster to set the cam gear timing (the screws with washers move toward the center).

If timing is OK and have good Vanos oil pressure new solenoids should function properly.


Yeah, I refitted the vanos regulator. Later, the vanos system test showed this result.

As a result of the measurement, Intake Bank 1

Maximum stop position: 154.4 CA
Minimum stop position: 154.2 CA

Adjustment time, opening too small: 130.0 ms
Adjustment time, opening too large: 550.0 ms

Minimum valve quality: 0.8
Valve current: 500.0 mA

As a result of the measurement, exhaust bank 1

Maximum stop position: 123.0 CA
Minimum stop position: 98.8 CA

Adjustment time, opening too small: 720.0ms
Adjustment time, opening too large: 460.0 ms

Minimum valve quality: 0.9
Valve current: 249.0 mA

As a result of the measurement, Intake Bank 2

Maximum stop position: 149.7 CA
Minimum stop position: 114.2 CA

Adjustment time, opening too small: 220.0 ms
Adjustment time, opening too large: 710.0 ms

Minimum valve quality: 0.9
Valve current: 323.0 mA

As a result of the measurement, exhaust bank 2

Maximum stop position: 129.8 CA
Minimum stop position: 107.2 CA

Adjustment time, opening too small : 240.0ms
Adjustment time, opening too large: 470.0 ms

Minimum valve quality: 0.9
Valve current: 251.0 mA

Still, the vanos test is abnormal.

Should the vanos gear unit be replaced?

Or should we replace the solenoid?

And now this fault code remains.

00275F DME: VANOS maximum-stop position, intake air, bank 1
 

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Discussion Starter · #23 ·
What is the regulator, solenoids or adjusters?. if adjuster then I think you need to go back more than that, to the central bolt removal then install after you set the cam gear in proper position.

Because the camshaft didn't follow the test command.
The other moved but still within short range and slow, all solenoid current are out of range.

Need another solenoids.
I meant the vanos unit.
This is the result of reinstalling.
Will the solenoid change solve it?

Will it be the same if I exchange the vanos unit?
 
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