PISTON AS 1850107 - Caterpillar

D398B (66B, 35Z);
D399 (35B, 36Z);
3508 (23Z, 70Z);
3512 (24Z, 67Z, 4KC);
3516 (25Z, 73Z, 3RC)Introduction
This publication gives the information needed to install the specific flexible mounting group for the generator set engines given above.This publication also includes the information needed for the installation of a radiator mounting group for those 3500 Family Engines that have an engine mounted radiator. Refer to the charts that follow. Do not perform any procedure, outlined in this publication, or order any parts until you read and understand the information contained within.Reference: Service Manual, Parts Book.Installation of Engine Flexible Mounting Group - Engines With or Without a Mounted Radiator
The engine will set about as level as the mounting surface, so the more level the mounting surface, the easier it will be to level the engine.1. Lift the engine and generator set high enough to permit installation of the mount assemblies from the mounting group. A minimum of 140 mm (5.5") clearance is needed for installation of the mount assemblies. In the 5N8877 Engine Mounting Group, all three springs in each mount assembly are a gold color. In each 8N9567 and 8N9570 Engine Mounting Group, the center spring is blue in color, while each outer spring is a gold color. The only difference between an 8N9567 Mounting Group and an 8N9570 Mounting Group is the quantity of mount assemblies in each group.2. Put sufficient support under the mounting rails of the engine and generator set, so there is support in no less than eight locations. Make sure the supports do not interfere with the locations where the mount assemblies are to be installed.Refer to the topic entitled Mounting Schematics and Installation Dimensions in this publication, for the installation location of the mount assemblies, according to engine and generator set model. 3. Before installing a mount assembly, use tape or tie some string around it, on both sides of bolt (1). This is to hold the mount assembly together during the installation procedure.Remove bolt (1) with locknut (2) from mount assembly (3).4. Install a 5P7197 Washer (4) on bolt (1) as shown, then insert the bolt through the mounting hole in the bottom of frame rail (5).5. Put mount assembly (3) under bolt (1) in frame rail (5). Thread bolt (1) into the mount assembly. Make sure bolt (1) does not extend through the top threaded plate of the mount assembly.Use this procedure to install each of the mount assemblies needed for the engine and generator set.6. Lift the engine and generator set and remove the support material that was installed earlier. 7. Lower the engine and generator set into position until there is a slight load on the mount assemblies.Remove the tape or string from around each mount assembly. Position each mount assembly directly under the frame rail, then lower the complete unit.8. Use bolt (1) to adjust the mount assembly so dimension (X) is approximately 6.35 mm (0.25"). After the adjustment is completed, tighten locknut (2). Use this procedure to adjust each mount assembly.Mounting Schematics