Hi,
Vanos unit in these S50B32 engines really makes life hilarious
I have been through the following in my -99 M Coupe (so far) :
- at about 67 tkm replaced both inlet and exhaust solenoid O-rings with BMW OEM parts (nitrile material ? Did not know any better at that time ...)
- at about 89 tkm replaced the same with Viton O-rings when changing into high tensile bolts for the solenoid and piston covers
- at 110 tkm experienced a failure with the internal piston seals leading to power loss and idle issues. This was remedied by changing the whole Vanos unit into a unused factory serviced unit (Rols Royce)
- now, at 117 tkm I just noticed that the solenoid O-rings have started to leak again !!!
I trusted that the factory service unit would have been serviced with higher quality O-rings than the original ones. No, this seems not to be the case !
Please provide your advice and comments whether it would be best to use
1) "Normal" Viton O-rings ( for example here http://www.mrvanos.com/E36-M3-S50-B3...1848237%29.htm )
2) E39 M5 S62 multifacet Viton O-rings ( recommended by Beisan Systems http://www.beisansystems.com/procedu..._procedure.htm )
3) Buy Porsche Cayman
4) Something else, what ?
Beisan System says :
"The vanos solenoid O-rings also fail and in some cases and cause external oil leak. These O-rings are made from Buna and harden and flatten.
Replacing the O-rings with Viton O-rings has proven to not work. The Viton O-rings shred from the high oil pressure. BMW has redesigned the solenoid O-rings for the S62 engine (E39 M5) vanos unit. The S62 vanos solenoids are the same as the Euro S50 vanos solenoids and share the same O-rings. The new S62 solenoid O-rings are not only made from Viton but also have multiple facets. These facets function to divert oil flow away from the O-ring and keep it from shredding. The new S62 vanos solenoid O-rings are the correct design and can be used for this vanos solenoid O-rings."
I have all the time used the Castrol 10W60 BMW M approved "TWS" oil and warmed the engine up to 90 C oil temperature before dropping the hammer.
Luckily, replacing the solenoid O-rings alone is not a big job but nevertheless throws a shadow on the quality of the original parts.
Any advice is appreciated.
br, Juha
Vanos unit in these S50B32 engines really makes life hilarious
I have been through the following in my -99 M Coupe (so far) :
- at about 67 tkm replaced both inlet and exhaust solenoid O-rings with BMW OEM parts (nitrile material ? Did not know any better at that time ...)
- at about 89 tkm replaced the same with Viton O-rings when changing into high tensile bolts for the solenoid and piston covers
- at 110 tkm experienced a failure with the internal piston seals leading to power loss and idle issues. This was remedied by changing the whole Vanos unit into a unused factory serviced unit (Rols Royce)
- now, at 117 tkm I just noticed that the solenoid O-rings have started to leak again !!!
I trusted that the factory service unit would have been serviced with higher quality O-rings than the original ones. No, this seems not to be the case !
Please provide your advice and comments whether it would be best to use
1) "Normal" Viton O-rings ( for example here http://www.mrvanos.com/E36-M3-S50-B3...1848237%29.htm )
2) E39 M5 S62 multifacet Viton O-rings ( recommended by Beisan Systems http://www.beisansystems.com/procedu..._procedure.htm )
3) Buy Porsche Cayman
4) Something else, what ?
Beisan System says :
"The vanos solenoid O-rings also fail and in some cases and cause external oil leak. These O-rings are made from Buna and harden and flatten.
Replacing the O-rings with Viton O-rings has proven to not work. The Viton O-rings shred from the high oil pressure. BMW has redesigned the solenoid O-rings for the S62 engine (E39 M5) vanos unit. The S62 vanos solenoids are the same as the Euro S50 vanos solenoids and share the same O-rings. The new S62 solenoid O-rings are not only made from Viton but also have multiple facets. These facets function to divert oil flow away from the O-ring and keep it from shredding. The new S62 vanos solenoid O-rings are the correct design and can be used for this vanos solenoid O-rings."
I have all the time used the Castrol 10W60 BMW M approved "TWS" oil and warmed the engine up to 90 C oil temperature before dropping the hammer.
Luckily, replacing the solenoid O-rings alone is not a big job but nevertheless throws a shadow on the quality of the original parts.
Any advice is appreciated.
br, Juha
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