Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1985TOPAZ LS, 2D SEDAN, 2.0 HREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELTESTINGFUEL SYSTEM TESTINGCRANKCASE PRESSURE TEST
1985 Mercury Topaz LS, 2D Sedan, 2.0 H
Crankcase Pressure Test
1985 Mercury Topaz LS, 2D Sedan, 2.0 HSECTION Crankcase Pressure Test
- 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.
- 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 internal engine problem.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.