FITTING 1149149 - Caterpillar

The cylinder heads have valve seat inserts, valve guides, and bridge dowels that can be removed when the parts are worn or damaged. Refer to Disassembly and Assembly for the replacement of these components.Valves
The removal and the installation of the valves is easier with use of the 1P-3527 Valve Spring Compressor.Valve Seat Inserts
Use the 166-7441 Valve Seat Extractor Tool for the removal and the installation of the valve seat inserts. Lower the temperature of the insert before the insert is installed in the head. Valve Guides
The tools for the removal and for the installation of the valve guides are the 5P-1729 Valve Guide Bushing and the 7M-3975 Valve Guide Driver. The counterbore in the driver bushing installs the guide to the correct height.Checking Valve Guide Bores
Use the 5P-3536 Valve Guide Gauge Group in order to check the bore of the valve guides. Refer to the instructions that are included with the tool.
Illustration 1 g00285313
5P-3536 Valve Guide Gauge Group
Bridge Dowels
Use a 5P-0944 Dowel Puller Group and a 5P-0942 Dowel Extractor. Remove the bridge dowels. Install a new bridge dowel with a 6V-4009 Dowel Driver. This dowel driver installs the bridge dowel to the correct height.