Look for oil seepage from the turbo boot and the turbo X-over gasket, indicating a turbo pumping oil. Also look at the area between the cam followers for burnt paint, indicating a spun cam bushing. If it still smokes it could need an overhead set or possibly a camshaft. All the big cams smoked a lot cold, but it should be running pretty clean after coolant temp is 140* or so. Look for coolant stains down the side of the block from the head gasket area. Some of them had a problem with the cam followers breaking. They have what is called a thin deck block and were prone to cracking in the liner counter bores and bolt holes, causing coolant leaks at the head gaskets, and it takes major machine work to fix, and then they may still leak. They had what is called a thin wall cam bushing that was prone to spinning and ruining the block. ISO:9001-2015 standards making it leak tested and approved.I believe a 79 would have a Big cam I 350 if it is the original engine.
This water pump comes with a one year warranty.
The coolant pump meets ISO:9001-2015 standards making it leak tested and approved by top experts in the field. It contains case hardened bearings to increase longevity of the product complete sealing components CNC-machined mountings for ease of installation as well as a chemical-resistant metal impeller to manage high temperatures and provide maximum coolant flow through the engine. This Match Made water pump is fit for Freightliner, Sterling Truck, and Kenworth vehicles with Cummins Big Cam III NTC300, 350, 400, Formula 300, 350, 400, 475 engines.
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