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Overdrive D-Type Volvo Amazon (B16/B18)

Sluggish engagement, an overdrive that won't hold, or oil dripping from the housing are classic symptoms of a worn D-type overdrive on the 122. When hydraulic pressure drops, the unit engages slowly or kicks out – the fault is then often in leaking gaskets, tired O-rings, or a worn ball and valve seat in the hydraulic circuit.

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This category gathers wear and sealing parts for overhauling the D-type unit on cars with the B16 and B18 engine. The group includes gaskets and O-rings to seal the housing, bearings for shafts and gears, plus ball, washer, nut, stud and oil plug that belong to the hydraulics and assembly.

During a rebuild the oil level and correct oil are crucial – too little or the wrong type gives weak engagement. Replace gaskets and O-rings all at once while the unit is open anyway, and check the ball valve's seat, so you avoid new leakage and irregular function shortly after reassembly.

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