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Home >> Mercury >> 1987 >> Lynx L, MTXII >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Fuel Injection System - 4-CYL Diesel >> Testing >> Fuel System Testing >> Crankcase Pressure Test
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Crankcase Pressure Test

  1. Remove breather hose from camshaft cover and plug opening. Remove oil filler cap and install adapter (10340). See Figure . Connect adapter line to 0-60 in. H2O gauge.
  2. Install Cap (10870) on dipstick tube and Cap (10872) on breather nipple of camshaft cover. Run engine at 4000 RPM, no load. Pressure should not exceed 6 in. H2O at 4000 RPM. If it does, there is an internal engine problem.
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