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TROUBLESHOOTING & REPAIR
SCR REMOVAL AND REPLACEMENT (continued)
FIGURE F.44 – RECTIFIER BRIDGE ASSEMBLY BRACKET DETAILS
GROMMET 
BRACKET
SCREWS (4)
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PROCEDURE
1.Turn the engine off.
2.Perform the SCR/Diode Rectifier Bridge Assembly Removal procedure.
3.Using the 7/16” wrench, remove the mounting bracket for the SCR/diode rectifier bridge assembly bracket. See Figure F.44.
4.Alternately loosen nuts 1/2 turn each until heat sinks are loose. Remove nuts and leaf spring. IT IS RECOMMENDED THAT NEW HARDWARE, LEAF SPRING AND HOUS- ING BE USED FOR REASSEMBLY.
5.Remove the old SCR.
6.Clean the area on the heat sink around the SCR mounting surface, using a putty knife or similar tool. DO NOT SCRATCH THE SCR MOUNTING SURFACE.
7.Polish each heat sink’s mounting surface using NO. 000 fine steel wool. Wipe surface clean with a
8.Inspect the mounting surfaces of each new SCR.
a.Remove all burrs and wipe clean. Do not use steel wool or any abrasive cleanser on the SCR mounting surfaces.
9.Apply a thin (0.001” to 0.003”) layer of PEN- ETROX
a.Care must be used to prevent foreign material contamination of the SCR to heat sink junction.
10.Place the new SCR between the heat sinks. Be sure that the outer metal ring of the SCR is facing toward the same heat sink as the old SCR’s metal ring. Be sure that the roll pin of the heat sink engages the “hole” in the SCR. The SCR contact surfaces must sit flat against both heat sink surfaces.
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