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How to Install Harmonic Balancer - Envoy/Trailblazer. I finally got the engine put back together and it's running smooth. In this video I show how I installed the harmonic balancer on my 2004 GMC Envoy with a homemade installer tool. Harmonic balancer installation on GMC Envoy or Trailblazer . After an initial diagnosis of low oil pressure with a manual pressure gauge in my 2004 GMC Envoy (~255,000 miles), I decided to investigate the oil pickup tube. Come to find out, it was about 90% clogged! This is how I fixed it. GM 12628565 Timing Cover/Oil Pump GM 89017622 Crankshaft Oil Seal (Front) GM Air Conditioning Pressure Sensor Permatex Ultra Grey RTV Waiting on Harmonic Balancer Installer (GM Oil Pickup Tube Removal - Part 4) Diagnosing Envoy Low Oil Pressure Part 1 Diagnosing Envoy Low Oil Pressure Part 2 Diagnosing Envoy Low Oil Pressure Part 3 Music Credit:
