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Land Cruiser

  1. Warm up engine and check ignition timing. Timing should be 7 degrees BTDC. Disconnect vacuum hose between HAC valve and distributor at HAC valve side. Plug hose end. Check that timing mark on flywheel advances to 6 degrees.
  2. Disconnect vacuum hose from check valve at Black side and plug hose end. Check that ignition timing remains stationary for more than one minute. If timing changes, replace check valve. Stop engine and reconnect hoses to proper location.
  3. Disconnect 3 hoses on top of HAC valve. Blow air into each hose and verify that air flows into carburetor. Reconnect hoses to proper locations.
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