Hey everyone, I would like to share an improvement that I have designed and now manufacture for the euro S50B30, S50B32 engines. My revision stems from original design appearance (S62), those who know me...know that I am obsessed with keeping everything as oem appearance, even if it needs an upgrade.
Below is an example of an installed set, exhaust side has the m12 SS set-screws removed.
The Vanos hydraulic system on these engines see upwards of 100Bar at idle, as the solenoids activate and let the oil flow through them at that pressure, the solenoids themselves dislodge and move within a few millimetres of axial play that is allowed by the factory covers.
The factory covers also have a thin dust gasket between the cover and vanos assembly which add more room for axial play.
The amount of free movement may seem small but at that hydraulic force its strong enough to imprint the stamped production codes from the solenoids into the Vanos covers.
I have encountered radial play damage as well, it is seen inside the Vanos housing once the solenoids are removed. The inside end of the solenoid will gouge the sides of the bore it rests in.
The documented and known failure point due to the movement of the solenoids is the shearing force exerted onto the solenoid O'rings, causing peeling. And a less common fault, the cover bolts snapping.
On the early production S62 engine this problem occurred on a larger scale and it was addressed with a revised solenoid cover design featuring m12 set-screws to preload the solenoids into position, preventing movement.
S62 Vanos solenoid cover shown below.
The solenoid O'rings were also changed to D'rings, which feature a wiper lip style outside surface designed for hydraulic axial movement.
This change in O'ring is not necessary once the set-screw design was introduced, it was most likely implemented simultaneously as the cover was being redesigned and it just remained.
What some may know, is that the solenoids used on our S50 engines Vanos are the same ones found in early E36 3 channel ABS units. Those ABS units manufactured by ATE already utilize the same D'ring design as the solenoids inside those units have axial movement. These were viton D'rings and can even be reused in the most cases when I have retrieved them, minimal signs of compression setting.
I would recommend new O'rings with the revised cover design, which I can provide as well.
Covers will include SS m12 set-screws, the cover threads will fit the oem S62 set-screws if you want to go that route.
I can offer replacement Titanium bolts+washers as well if wanted.
I am also in process of working on providing the dust gaskets with the covers, as it will no longer be a problem to run the gaskets.
Tightening torque for the set-screws remains the same as per TIS instruction at 16 Nm (12 ft-lbs).
Covers for both engine types are ready to roll out.
Below is an example of an installed set, exhaust side has the m12 SS set-screws removed.
The Vanos hydraulic system on these engines see upwards of 100Bar at idle, as the solenoids activate and let the oil flow through them at that pressure, the solenoids themselves dislodge and move within a few millimetres of axial play that is allowed by the factory covers.
The factory covers also have a thin dust gasket between the cover and vanos assembly which add more room for axial play.
The amount of free movement may seem small but at that hydraulic force its strong enough to imprint the stamped production codes from the solenoids into the Vanos covers.
I have encountered radial play damage as well, it is seen inside the Vanos housing once the solenoids are removed. The inside end of the solenoid will gouge the sides of the bore it rests in.
The documented and known failure point due to the movement of the solenoids is the shearing force exerted onto the solenoid O'rings, causing peeling. And a less common fault, the cover bolts snapping.
On the early production S62 engine this problem occurred on a larger scale and it was addressed with a revised solenoid cover design featuring m12 set-screws to preload the solenoids into position, preventing movement.
S62 Vanos solenoid cover shown below.
The solenoid O'rings were also changed to D'rings, which feature a wiper lip style outside surface designed for hydraulic axial movement.
This change in O'ring is not necessary once the set-screw design was introduced, it was most likely implemented simultaneously as the cover was being redesigned and it just remained.
What some may know, is that the solenoids used on our S50 engines Vanos are the same ones found in early E36 3 channel ABS units. Those ABS units manufactured by ATE already utilize the same D'ring design as the solenoids inside those units have axial movement. These were viton D'rings and can even be reused in the most cases when I have retrieved them, minimal signs of compression setting.
I would recommend new O'rings with the revised cover design, which I can provide as well.
Covers will include SS m12 set-screws, the cover threads will fit the oem S62 set-screws if you want to go that route.
I can offer replacement Titanium bolts+washers as well if wanted.
I am also in process of working on providing the dust gaskets with the covers, as it will no longer be a problem to run the gaskets.
Tightening torque for the set-screws remains the same as per TIS instruction at 16 Nm (12 ft-lbs).
Covers for both engine types are ready to roll out.
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