Article 3278 - Aeration and Loss of Engine Coolant

TSB #158 - January 29, 1971
("L" Series Trucks with Super Duty Engines - 1970)


Loss of engine coolant and excessive aeration can be caused by inadequately torqued air compressor cylinder heads, which allows compressed air to enter the coolant system. Loss of coolant can be observed as follows:
    • Aerated coolant (foam) visible in radiator sight glass.
    • Abnormal aerated and excessive coolant from the radiator overflow tube.
    • Excessive coolant refill.
NOTE: Compressor cylinder head bolt torque should be 14-16 ft. lbs. (175-225 inch lbs.).

WARRANTY STATUS: INFORMATION ONLY

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