HOSE-HYDRAULIC 1226872 - Caterpillar

3600 Family Of EnginesDescription of Change: The paddles in the air inlet shutoff groups, used on the 3600 Family of Engines, now have bleed holes. Formerly, when the air inlet shutoff was tripped, it could take as long as one hour before the shutoff could be reset. This occurred because vacuum, formed by the tight seal of the closed shutoff, held the paddle in the closed position. Now, the bleed hole will relieve the vacuum and allow the shutoff to be quickly reset.Adaptable To: The bleed hole in the paddles in the air inlet shutoff groups used on the 3600 Family of Engines is in effect as shown in Chart A. A bleed hole can be drilled in the paddles in the air inlet shutoff groups on the 3600 Family of Engines listed in Chart B. See the procedure that follows to add the bleed hole to air inlet shutoff groups. To add the bleed hole to air inlet shutoff groups, use the procedure that follows.
1. With the engine stopped, trip the air shutoff so the paddles are in the closed position.2. Remove the air inlet pipes between the air inlet shutoff and the turbocharger.3. Drill one 1.6-2.4 mm (.062-.094") diameter hole through the paddle at the location shown in the illustration.
Location for the bleed hole in the paddles in the air inlet shutoff groups.4. Clean all debris from the air inlet shutoff.5. Install the air inlet pipes that were removed in Step 2.6. Reset the air shutoff.7. Start the engine and test the inlet air shutoff.