COVER AS-VALVE MECHANISM 9Y4580 - Caterpillar

Generator SetC18 MAR GENSET (S/N: SSW1-UP)C18 MARINE (S/N: JHL1-UP; DTP1-UP)Marine EngineC18 (S/N: TNA1-UP; GTB1-UP; JLE1-UP; T2R1-UP; GEX1-UP)C18 MARINE (S/N: JKX1-UP)C18 MARINE ENG (S/N: T2P1-UP)Description Of Change: An improved exhaust manifold is now used on certain marine engines. The manifold is improved to be more robust against cracks at the turbo mounting flange. The machine path at the turbo flange weld has been improved to remove less weld which increases joint strength.Adaptable To: Replace the manifold with an improved 142-4162 Manifold (single turbo) or 388-3721 Manifold (dual turbo).
Illustration 1 g06035106
Old Machining Path
Illustration 2 g06035109
New Machining Path
The improved exhaust manifold is adaptable to and effective in production for the serial numbers that are listed in Table1.
Table 1
Sales Model Adaptable Serial Numbers Effective Serial Numbers
C18 S/N:DTP1-447 S/N:DTP448-UP
S/N:GEX1-5170 S/N:GEX5171-UP
S/N:GTB1-5104 S/N:GTB5105-UP
S/N:JHL1-704 S/N:JHL705-UP
S/N:JKX1-1988 S/N:JKX1989-UP
S/N:JLE1-5372 S/N:JLE5373-UP
S/N:SSW1-102 S/N:SSW103-UP
S/N:T2P1-5100 S/N:T2P5101-UP
S/N:T2R1-5352 S/N:T2R5353-UP
S/N:TNA1-5180 S/N:TNA5181-UP