(c) Faulty lubrication. Refer to paragraph [20].
(d) Loose cylinder head bolts and/or faulty gasket. Tighten head bolts or replace gasket (par. [41]).
(4) Overheating.
(a) Faulty fuel system. Refer to paragraph [31].
(b) Dirt on cylinders. Clean fins on cylinder, especially the fins on cylinder head.
(c) Defective lubrication system. Refer to paragraph [30].
(d) Defective ignition system. Refer to paragraph [32].
(e) Idling engine without having vehicle in motion. Do not idle engine longer than 1 minute.
(f) Valve tappet adjustment incorrect. Refer to step b (1) below for test, to paragraph [43] for adjustment.