SEAL 5H4081 - Caterpillar

Engine:
3512 (S/N: 1LM1-UP)
3512B (S/N: 2AF1-UP; 3KD1-UP)
3512 and 3512B Engines that are used for offshore oil well service are subject to extreme corrosion of external components. This can result in shorter intervals between engine overhauls.A plan has been developed for improved corrosion protection for these engines. The plan includes revised components, new coatings, and new sealants. Some existing components are corrosion resistant and will remain as part of the standard offering.These engines receive multiple coats of epoxy and urethane after final assembly. The following parts, practices and procedures will serve to enhance corrosion resistance:
Caulk all joints and gaps that may retain water. Use 3M Ultrapro Autobody Sealant or an equivalent product. This is done prior to the surface preparation and final coating of the engine. This procedure will prevent corrosion on the metal that is below the external protective coating.
Cover the exposed heads of bolts with silicone rubber caps capable of withstanding temperatures up to 316 °C (600 °F). These 28.6 mm (1.125 inch) caps are available from silicone cap suppliers. Retain the silicone caps with a non-acidic silicone adhesive such as Dow Corning 735 or Dow Corning 3145 RTV - Gray. These products are suitable for the temperatures that are encountered with cylinder head bolts. This will reduce corrosion of the bolt heads in order to simplify standard disassembly.
Apply coatings that are resistant to corrosion such as High Performance Coatings H-11 to the following external aluminum engine components: valve covers, cam covers and other removable access covers.The corrosion resistant parts are listed in Tables 1 and 2.Note: The parts that are listed in bold are the groups for the subsequent parts.
Table 1
3512 Mechanical Unit Injected Engines
Serial Number S/N:1LM    
Standard Part Number     Corrosion Resistant Part Number     Description    
144-2890     265-8038     Breather Gp (1)    
4W-1450     265-8039     Cover As    
7N-1855     265-8040     Valve Mechanism Cover Gp (1)    
2W-8894     265-8041     Cover    
9Y-7276     265-8042     Cylinder Block Cover Gp (1)    
8N-9992     265-8043     Cover (Camshaft)    
8N-9993     265-8044     Cover (Camshaft Oil Filler)    
1N-2914     265-8045     Cover (Cylinder Block Side)    
9Y-7279     265-8046     Cover (Crankshaft)    
9Y-6455     264-6361     Exhaust Manifold Gp (1)    
5M-2894     110-8314     Washer    
9L-7373     5P-7128     Bolt    
9Y-6469     N/A     Exhaust Manifold (Right Hand)    
9Y-6470     146-3045     Exhaust Manifold (Left Hand)    
115-0549     146-3041     Exhaust Manifold (Front)    
115-0553     146-3044     Exhaust Manifold (Intermediate Left Hand)    
115-0555     146-3043     Exhaust Manifold (Front)    
115-0557     146-3042     Exhaust Manifold (Intermediate Right Hand)    
124-0216     264-7683     Exhaust Elbow (Right Hand)    
124-0217     264-7682     Exhaust Elbow (Left Hand)    
N/A     262-5054