Detroit Diesel — Adjust the Turbo Speed Sensor Air Gap
Adjustments
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- With engine stopped at ambient temperature, unplug the TSS and measure resistance between sensor terminals (approx. 900 Ω).
- Remove the TSS from the turbo shaft housing.
- Adjust the air gap by adding a 0.020 in. washer between the sensor body and the housing.
- Install the sensor into the turbo shaft housing.
Tools required
- 0.020 in. washer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Resistance approx. 900 Ω
- Air gap washers 0.020 in.
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.