Usage:
3406C (3ZJ) Truck Engines;
3406B (2EK) PEEC Truck Engines;
Caterpillar Machines Powered By 3406 (11N) Machine Engines
- SUPPLEMENT: May 17, 1993
March 22, 1993; Page 6; "New Bushing Used In Fuel Injection Pump Groups"
The Effective Engine Serial Numbers provided in the Chart are NOT correct. A corrected Chart follows:
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Reference: Service Magazine; September 21, 1992; Page 9; "New Fuel Injection Pump Groups Have Larger Diameter Camshaft Bores, New Lifter Assembly, And Shorter Plunger And Barrel Assembly " on 3406B and 3406C Engines.
Description of Change: A new bushing is used with the high lift fuel injection pump camshaft and shorter 4P7681 Pump Plunger And Barrel. See the Reference Article. The new bushing must not be used on fuel injection pump groups without the high lift camshaft and shorter pump plunger and barrel. Also, the former bushing must not be used on the new fuel injection pump groups with the high lift camshaft.
Adaptable To: The new 4P2899 Bushing is in effect as listed in the chart. The 4P2899 Bushing should not be used to replace a 7C6617 Bushing and a 7C6617 Bushing should not be used to replace a 4P2899 Bushing.
Illustration 1. Location of the new 4P2889 Bushing in the fuel injection pump group.
Illustration 2. Difference between the 7C6617 Bushing (1) and the 4P2899 Bushing (2) is raised lip (3).
