PIN 9R9049 - Caterpillar

3208 Industrial Engines (3Z and 90N);
3208 Generator Set Engines (29A and 30A)SUPPLEMENT: 04/00/85ENGINE NEWS, AUGUST 22, 1984, PAGE 3.In the article, "New Fuel Injection Pumps, Fuel Injection Lines, Fuel Injection Nozzles, and Piston and Rod Groups Used On Some Engines", add the following information to "Adaptable To" at the end of the article.
In turbocharged 3208 Industrial Engines used in Sperry-New Holland products (4W9003 Basic Engine Arrangement), the effective serial number for the new fuel system components is 3Z3923. Another new feature of this 4W9003 Basic Engine Arrangement is the 4W1134 Turbocharger Group. This replaces the former turbocharger group used on the former 9N6482 Basic Engine Arrangement.
--------------- END SUPPLEMENT ---------------Description of Change: The Basic Engine Arrangements for the models listed above have been changed. 3208 Marine Engine arrangements have not changed. These changes include new governor and fuel injection pump groups and new fuel injection lines groups on both the naturally aspirated and the turbocharged engine arrangements. Also changed are the piston and rod groups and the fuel pump drive group on some naturally aspirated engine arrangements only.
Illustration 1. Orificed Delivery Valve (ODV)The new governor and fuel injection pump groups have new fuel injection pump assemblies (see Charts 1 and 2). The fuel injection pump assemblies have an orificed delivery valve (ODV), see Illustration 1. The former pump assemblies used either a reverse flow check valve (RFC) or a hat check valve, see Illustrations 2 and 3. The new ODV performs the same functions as the former RFC with fewer parts. They both give protection against continuous fuel flow from the fuel transfer pump to the cylinder caused by a cracked or broken fuel injection nozzle. Both (ODV and RFC) bleed the fuel pressure pulses, that occur between injections, back to the fuel transfer pump. The hat check valve does not provide either of those functions.
Illustration 2. Reverse Flow Check Valve (RFC)
Illustration 3. Hat Check Valve
Illustration 4. Notched nuts used on new fuel lines.The new fuel lines groups contain new fuel lines and new fuel injection nozzles. The new fuel lines have a larger inside diameter of 1.83 mm (.072"), compared to 1.6 mm (.063") for the former fuel lines. See Chart 3 for part numbers of the new fuel lines. The new fuel lines can be identified by the notches on the nuts used in the fuel line assemblies. See Illustration 4.
Fuel enters the new fuel injection nozzle assemblies from the top instead of from the side on the former nozzles. See Illustration 5. The fuel line on the new fuel injection nozzle assembly is formed to go over the top of the rocker shaft of the valve mechanism. This will allow the fuel injection nozzle assemblies to be removed without removing the rocker shafts. The rocker shafts had to be removed to take out the former fuel injection nozzles.
Some naturally aspirated engine arrangements have replaced their former high compression ratio (18.2:1) rod and piston groups with lower compression ratio (16.5:1) rod and piston groups. See Chart 4.
Some