Sage Pillar - The Tighter Of Two Holes -private... Direct

Position the chilled Sage Pillar over the aligned two holes. Using a brass drift and a dead-blow hammer, drive the pillar squarely. You will feel a distinct increase in resistance exactly when the pillar enters the tighter hole. This is the “tightening event.” Continue until the pillar’s shoulder seats flush.

Some mechanics, frustrated by the tight fit, ream out the tighter hole to match the loose hole. This destroys the Sage Pillar’s function. Without the differential tightness, the pillar becomes a standard dowel, and the two holes will cross-communicate. Sage Pillar - The Tighter of Two Holes -Private...

A knock sensor must detect vibrations from one cylinder only (a private signal). Engineers mount the sensor on a Sage Pillar inserted into the tighter of two holes in the engine block. The tight fit filters out ambient noise (vibrations from adjacent cylinders), giving the ECU a pure, private signal. Position the chilled Sage Pillar over the aligned two holes

Perform a pressure test or a dye penetrant test on the side of the tighter hole. No seepage should occur. For mechanical assemblies, apply torque; the pillar must not rotate. This is the “tightening event

Place the Sage Pillar in a freezer (-20°C or -4°F) for 2 hours. The thermal contraction temporarily reduces its diameter by approximately 0.01mm, making it easier to start into the tighter hole without galling.