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STARTER - HOUSINGS, D.E. (51-)51-238 AND 51-252 D.E. HOUSINGS"A""B"51-238 is used on Starterswith 10-Tooth Drive (54-212).51-252 is used on Starterswith 12-Tooth Drive (54-215).Note that the center line “A” on the 51-238 aligns with the center line of the mounting hole.On the 51-252, the center line “B” does not align with the mounting hole.The 51-252 D.E. Housing can replace the 51-238 provided 51-252 is used with the 12-Tooth Drive (54-215).Ford recommends replacing the 10-tooth Starter F0OY-11002-A or F2DZ-11002-A (2-1557-FD) with a 12-tooth Starter:F3DZ-11002-B (2-1570-FD) to correct a condition that may be encountered on 1992-93 Ford SHO Taurus 3.0L wherethe starter-motor cranking speed is inadequate, causing fuel flooding.STARTER - FRAMES (C.E., C.S., D.E.)Ground offPart No.51-246 AND 51-251 D.E. HOUSINGS51-247 AND 51-250 D.E. HOUSINGSThese housings appear similar but are not interchangeable.F2TU-11131-CA51-246 (3/8-16)51-247 (11mm)CastingPart No.CastingPart No.Each of these housings were originally cast with two OE numbers on the casting. But after they were machined,Ford ground off one of those numbers, depending on how they had machined that particular housing.51-246 and 51-251 both housings w/ 3/8-16 Mtg. Hole Size51-246 OE number is visible in the 1:30 area on the casting, and the ground-off area is at about 10:3051-251 OE number is visible in the 10:30 area on the casting, and the ground-off area is at about 1:3051-247 and 51-250 both housings w/ 11mm Mtg. Hole Size51-247 OE number is visible in the 1:30 area on the casting, and the ground-off area is at about 10:3051-250 OE number is visible in the 10:30 area on the casting, and the ground-off area is at about 1:30F2TU-11131-BA51-251 (3/8-16)51-250 (11mm)Ground offPart No.360