Truckers News - June 2009
June 2009 TrucKers News 29 them with a special tool that keeps the levers level. D The engine is then turned over to align the timing marks on the gears that drive the camshaft so it can be replaced in proper time or relation to the crankshaft's position. The bolts that fasten the camshaft thrust plate are removed so the camshaft itself can later be removed. E Parts like the fuel lines, injec-tor electrical harness and cool-ant hoses need to be disconnected. Remove the camshaft-bearing sad-dle-mounting bolts, along with the bearing saddles themselves. The upper front cover also must be un-bolted to free the camshaft. Then the camshaft, its drive gear and the upper front cover can be hoisted off the head. F The 38-cylinder head bolts must now be removed. If any are cor-roded, a long breaker bar may be needed. G The engine lifting brackets are removed, a special lifting brack-et is bolted onto the head, and a crane is used to lift the head off the engine. H A head in the shop was receiv-ing new valves and seats in one cylinder. You can see that the seat insert on the lower right has been removed. I Finally, a remanufactured cyl-inder head is brought out of the parts department. It will be in-stalled, with a new gasket to seal be-tween it and the block, by generally reversing the removal process. One critical difference is that the bolts at-taching the head will be torqued in a specified order, usually in several stages, with a special torque wrench that measures how tight they are. This is precision work! Our thanks to service manager Bary Spitler and Penn Detroit Diesel Al-lison, Fleetwood, Pa., for their help in preparing this article. D E F G H I