COMMON AR 3888280 - Caterpillar

The four contact points were needed because of the introduction of the 3204 Direct Injection Engine, and the procedure change to Special Instruction "Using The 5P6524 Engine Timing Indicator Group and 1P540 Flow Checking Tool Group", Form No. SMHS7083-01. The Special Instruction changed the procedures used to "zero" the dial indicator used to find piston top center. The change in procedures was needed to give enough indicator travel for the 3400 Series Direct Injection Engines and at the same time, have a common procedure for all models.
The chart that follows can be used as a reference for the tools needed for a given engine.
Please add the four new contact points to the "Reference Chart for Dial Indicators and Contact Points" in the Service Magazine, article "Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group," February 13, 1978, page 3.