Mercury Engine >> ENGINE OVERHEATING OR LOSS OF COOLANT
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Mercury Engine >> ENGINE OVERHEATING OR LOSS OF COOLANT
Engine Overheating Or Loss Of Coolant With No Indication Of
External Leakage On 1975-77 Ford (Ford, Lincoln & Mercury)
6.6L (400 CID) Engines
If coolant loss or overheating on the above engines is observed, this may be the result of a hairline crack at either side of the engine block on the tappet galley wall. The crack is usually found to be 4 - 5 inches in length located approximately 1 1/2 above the tappets between No. 2 & 3 or No. 6 & 7 cylinders.
Visual inspection of the rocker covers, oil dip stick, PVC valve inlet or breather cap will display accumulation of moisture deposits.
Remove the intake manifold and inspect the cylinder wall for a hairline crack above the tappets. A moisture deposit is usually evident at the crack area.
Pressure testing the cooling system for fifteen minutes with the intake manifold removed will positively identify the condition.
The AERA Technical Committee
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