2014/07/18 Caterpillar

Engine:

3508B (S/N: S2B1-UP; S2D1-UP; S2E1-UP)

3508C (S/N: TTB1-UP)

3512B (S/N: S2H1-UP; S2J1-UP; S2L1-UP; S2N1-UP)

3512C (S/N: TTC1-UP; TTF1-UP; MKH1-UP; E3W1-UP)

3516B (S/N: S2R1-UP; S2S1-UP; S2X1-UP)

3516C (S/N: TTD1-UP; PAG1-UP)

Engine News SEBD9913, 25 November 2013, "New Power Distribution Panel Groups are Used On Certain Tier 2 3508, 3512, and 3516 Marine Engines". Disregard the previous article, the effective serial numbers have been added to this article.

Description of Change: The new power distribution box has more robust relays which are more resistant to vibration caused by the engine.

Adaptable To: The new 446-0608 Box As is used in the power distribution panel groups listed in Table 1.

The new power distribution panel groups are adaptable back to first production of the serial numbers listed above.

ReferenceSpecial Instruction, REHS8664, "Installation of Improved Relays for the Power Distribution Panel Used on Certain 3500 Marine Engines"

Table 1

Application	New Panel Part Number	Former Panel Part Number
Propulsion and Auxiliary Engines	446-0608	290-7263
Marine Propulsion right hand	445-6852	290-3211
Marine Auxiliary	445-6853	290-3213
Marine Auxiliary with Pyrometer	445-6854	290-3214
		300-0479
Marine Propulsion left hand with Pyrometer	445-6855	300-0478

This change is effective with the serial numbers listed in Table 2.

Table 2

Effective Serial Numbers
S/N:S2B00847-UP
S/N:S2D00275-UP
S/N:S2E00853-UP
S/N:TTB00579-UP
S/N:MKH00289-UP
S/N:S2H00657-UP
S/N:S2J00795-UP
S/N:S2L00991-UP
S/N:S2N00132-UP
S/N:E3W00379-UP
S/N:TTC00645-UP
S/N:TTF00607-UP
S/N:PAG00483-UP
S/N:S2R00817-UP
S/N:S2S00495-UP
S/N:S2X01699-UP
S/N:TTD00424-UP