Caterpillar 3406 — Replace Coolant Conditioner Element
Maintenance · Coolant Conditioner Group
For the Caterpillar 3406, from the Caterpillar operator's manual.
Applies to: Caterpillar 3406
Before you start
- Close both inlet and outlet valves before removing the element to avoid coolant loss.
- All water is corrosive at engine operating temperature. Use either Caterpillar Cooling System Conditioner liquid, or the coolant conditioner element, but NEVER use both at the same time.
- Do not use Caterpillar Cooling System Conditioner or Coolant Conditioner Elements with Dowtherm 209 Full-Fill coolant.
Procedure
- Close the inlet valve and outlet valve (turn clockwise to close both valves).
- Remove the coolant conditioner element. Discard element.
- Clean the filter mounting base. Make certain all of the old filter gasket material is removed.
- Use only Caterpillar Part Number 9N3368 as a replacement element.
- Coat the seal of the element with a thin film of clean engine oil.
- Install and turn the element until the seal contacts the base, then tighten 3/4 turn more.
- Open the inlet valve and the outlet valve.
- Start the engine and check for leaks.
Specs & values
- Use only Caterpillar Part Number 9N3368 Amazon Amazon eBay $20.00 eBay $17.95 as a replacement element.
Full service-parts list: Caterpillar 3406 →
Source: Caterpillar operator's 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.