| Mercury Engine >> EXCESSIVE OIL CONSUMPTION |
Excessive Oil Consumption, Exhaust Smoking And/Or
Spark Plug Fouling In Some 1966 Mercury And Comet
6.3, 6.7 & 7.0L (390, 410 & 428 CID) Engines
It has been reported that rocker arm shaft support bolt holes in the cylinder heads of some 6.3, 6.7 and 7.0L (390, 410 and 428 CID) Ford Motor Co. engines may be drilled deep enough to enter the intake manifold ports. Because the rocker arm support bolts are under full oil pressure from the rocker arm shaft, oil may seep past the threads, enter the manifold ports and cause excess
oil consumption, spark plug fouling and exhaust smoking.
To determine this condition, check the bolt holes carefully. When air pressure is applied to the bolt holes, if the hole is found to be drilled through, the bolts must be replaced with a stud of new design.
For heads with countersunk holes use bolt No. 372351-S. For chamfered holes use bolt No. 372350-S. Use nut No. 354128-S with both new bolts. Coat stud threads with an oil resistant sealer prior to installation and torque the nut at 40 to 45 ft. lbs.
Warning: Do not attempt to correct the problem by coating the existing cap screws with any type sealer as this would be only a temporary repair.
The AERA Technical Committee
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