419-8235 Major Engine Overhaul Kit for 3412D Marine Engines{1000} Caterpillar

Industrial Engine:

3412D (S/N: REA1-UP)

Introduction

This Special Instruction is intended to provide information on the Engine Overhaul Kit Consist and detailed information on specific parts that should be used based on engine arrangements.

This Engine Overhaul Kit may contain extra parts and extra quantities due to the variety of engine arrangements assigned to a given kit. Refer to the corresponding Parts Manual or Disassembly and Assembly manual in Table 1.

Note: This Kit may contain upgraded parts. These upgraded part numbers may be different than what you have in the parts manual or engine, but these parts have been technically reviewed for compatibility with your application.

Note: This kit contains gasket kits and includes additional parts needed to perform an engine overhaul.

Note: This kit does not contain rod bearings, main bearings, and thrust plates.

Note: For assistance with technical questions, contact your local Cat dealer.

Note: For more information, visit us at catmarinesupport.com.

Note: For access to our website you can scan the QR code below with a QR enabled device.

Illustration 1	g03319969

Reference Material

Note: For ordering reference material contact your local Cat dealer.

3412D 419-8235 Major Overhaul Kit Consist

Note: For assistance or technical questions contact your local Cat dealer.

Note: Refer to Illustration 2 for location of gasket kits.

3412D Engine Gasket Kit Locations

Illustration 2	g03331009
(1) Aftercooler and Lines ( 420-0923 Gasket Kit ) (2) Rear structure ( 420-4866 Gasket Kit ) (3) Single Cylinder Liner ( 258-8117 Gasket Kit ) (4) Single Cylinder Head ( 420-4502 Gasket Kit ) (5) Central and Lower ( 420-0925 Gasket Kit ) (6) Fuel System ( 421-1305 Gasket Kit ) (7) Front Structure ( 420-0926 Gasket Kit ) (8) Expansion Tank ( 6V-0237 Gasket Kit ) (9) Oil Cooler and Lines ( 421-8976 Gasket Kit ) (10) Single Fuel Injector ( 281-0029 Gasket Kit )

Gasket Kit Consists

Single Cylinder Liner (258-8117 Gasket Kit)

Refer to Illustration 2.

Aftercooler and Lines (420-0923 Gasket Kit)

Refer to Illustration 2.

Rear Structure (420-4866 Gasket Kit)

Refer to Illustration 2.

Single Fuel Injector (281-0029 Gasket Kit)

Refer to Illustration 2.

Single Cylinder Head (420-4502 Gasket Kit)

Refer to Illustration 2.

Central and Lower (420-0925 Gasket Kit)

Refer to Illustration 2.

Fuel System (421-1305 Gasket Kit)

Refer to Illustration 2.

Front Structure (420-0926 Gasket Kit)

Refer to Illustration 2.

Oil Cooler and Lines (421-8976 Gasket Kit)

Refer to Illustration 2.

Expansion Tank (6V-0237 Gasket Kit)

Refer to Illustration 2.