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  #1  
Old 12-10-2019, 02:27 PM
Abramsoif Abramsoif is offline
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2007 BMW 650I (N62 Valve seals)

Does anyone have experience with this service?
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  #2  
Old 12-10-2019, 02:31 PM
Abramsoif Abramsoif is offline
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Issues with first cylinder intake valves not fully seated and leaking after seal replacement. Rocker arms removed from both intake valves and seals perfectly. Checked to ensure both arms seated properly. Seems the arms will not allow the valves to fully seat. Any thoughts?
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Old 12-10-2019, 08:25 PM
HerbP HerbP is offline
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Old 12-10-2019, 11:26 PM
ABoismenu ABoismenu is offline
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Quote:
Originally Posted by Abramsoif View Post
Issues with first cylinder intake valves not fully seated and leaking after seal replacement. Rocker arms removed from both intake valves and seals perfectly. Checked to ensure both arms seated properly. Seems the arms will not allow the valves to fully seat. Any thoughts?
Can you elaborate a bit more? You say first cylinder are you talking about cylinder #1 or are you referring to the first cylinder you did seals on? Do you know the valves aren't seated because you can hear air leaking past the valves, or is it misfiring? Try to be as detailed as possible with the problem you have and how you came to that conclusion and I'll try to help.
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Old 12-11-2019, 08:14 AM
Abramsoif Abramsoif is offline
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Thank you for the reply.
I have the AGA kit. Using a leak down tester for the repairs. Started on the exhaust valves. After the replacement of these seals the cylinder was holding with about an 8% loss. Moved on to the intake valves. After the repair it is at an 80% loss. I have the intake manifold off as I will be replacing the coolant pipe as well. You can hear and feel the large amount of air coming from the valves on the intake.
The odd part is. If I removed the rocker arms on the two valves (Valve springs still install) the valves seal and I am back to only 8% loss on the leak down test. I also reset to TDC to ensure that may not have been the issues. Same thing 80% loss on test. So it seems the issues has something to do with the rocker arms. Steps I followed.
1. Decompress valve spring.
2. Removed rocker arm.
3. Released decompression tool.
4. Applied air pressure to cylinder to keep valves closed.
5. Decompressed valve spring.
6. Removed keepers.
7. Decompressed spring and removed.
8. Removed old valve seal.
9. Installed new valve seal.
10. Installed valved spring.
11. Decompressed valve spring and installed keepers.
12. Released decompression tool & air pressure.
13. Decompressed valve spring ensuring to keep valve moving into open position.
14. Install rocker arm.
15. Released decompression tool to seat the valve and rocker arms.
16. Leak down test performed. Failed 80% loss.
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  #6  
Old 12-11-2019, 08:23 AM
Abramsoif Abramsoif is offline
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Some pictures to help
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Old 12-11-2019, 09:26 AM
Abramsoif Abramsoif is offline
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So after some playing around I came across some things. The first leak down test I did for all cylinders, I was running at 100psi with an average drop to just above 90psi.
Now it seems once I hit TDC on that 1st cylinder I have to dial it in with slight air pressure and a turn of the crank then it seals and the pressure builds. However, now the crank turns at about 20 psi. and I lose the pressure on the cylinder. Is that normal?
Still have the other 8 cylinders to get through.
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Old 12-11-2019, 09:43 AM
ABoismenu ABoismenu is offline
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I don't see anything jumping out in the pictures that could be causing the problem. Are you checking leak-down with the AGA brace still installed? (The tool that bolted to the intake cam housing where the oil line was) It almost looks like the tool is stopping the intermediate lever from coming all the way up, at least from what I can see from the picture. Can you tell if it's both valves leaking or is it a single valve?
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  #9  
Old 12-11-2019, 09:51 AM
Abramsoif Abramsoif is offline
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TDC is more of a pain getting it just right. Just went back and check. We are back to 90psi on cylinder one. Intakes seem to be holding now.
Moving on to the next one and will see if I hit the same problem.
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  #10  
Old 12-11-2019, 10:17 AM
Abramsoif Abramsoif is offline
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It's definitely something with the way I am putting the rocker arm back on.
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  #11  
Old 12-11-2019, 10:23 AM
Abramsoif Abramsoif is offline
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New seal rocker arm off.
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  #12  
Old 12-11-2019, 10:24 AM
Abramsoif Abramsoif is offline
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New seal rocker arm on.
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