Piston Oil Nozzle Cleaning And Inspection
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the nozzle assembly in solution.
- Inspect the nozzle assembly for the following:
- damaged bolt threads
- damaged or cut O-ring seal
- bent nozzle
- A restricted or stuck-open nozzle assembly
- With no oil pressure, the check ball should be seated and not permit flow through the nozzle tube. Using a blow gun, apply air pressure to the inlet portion of the bolt. Air pressure should unseat the check ball and permit flow through and out of the nozzle tube.
NOTE:
The piston oil nozzle assembly is designed to provide oil to the bottom side of the piston for cooling purposes. The internal check ball is held in the normally closed position by the spring until system oil pressure exceeds 300 kPa (43.5 psi).