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rotorwrench · 05-01-2015, 02:58 PM

[QUOTE=36fordguy;1078672]Most of the info is correct but not complete. If its truly a mercury motor the flywheel is drilled for a B&B cover. This cover will not work the fingers on the clutch are too long and will interfere with the larger TO bearing. The 1949 or 1950 B&B cover is what you need. These are extremely hard to find.

The early 51 Merc motors thru somewhere in February of 1951 still had the big 1 3/8" 10-spline transmission with the round pattern. If the motor comes with the 49 thru E51 stamped metal half bell and a clutch/flywheel, then it may have the right clutch. If it doesn't come with a half bell or flywheel then it may be easier to get a 9 1/2" flywheel or an 11" and just get it drilled for a 10" Long type. Most machine shops should be able to do that. If it has a Mercury flywheel with 6 evenly spaced PP bolts then you could find a 49 to E51 Merc clutch pressure plate with Borg & Beck number 0988 or 1310 stamped on. Ft Wayne clutch could likely convert the late 51 to 53 PP or a model 10A7 PP to the 49 to E51 Merc PP configuration if asked. The 10" Springflex B&B/Mercury clutch plate with the 1 3/8" 10-spline hub might be the hard part but Ft Wayne clutch could likely fix up one of those too. I still find these old cores on flea-pay now and then but you have to ask for the B&B part number to be sure.

05-01-2015, 02:58 PM	#55
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: 51 Merc v/8 into 40 ford [QUOTE=36fordguy;1078672]Most of the info is correct but not complete. If its truly a mercury motor the flywheel is drilled for a B&B cover. This cover will not work the fingers on the clutch are too long and will interfere with the larger TO bearing. The 1949 or 1950 B&B cover is what you need. These are extremely hard to find. The early 51 Merc motors thru somewhere in February of 1951 still had the big 1 3/8" 10-spline transmission with the round pattern. If the motor comes with the 49 thru E51 stamped metal half bell and a clutch/flywheel, then it may have the right clutch. If it doesn't come with a half bell or flywheel then it may be easier to get a 9 1/2" flywheel or an 11" and just get it drilled for a 10" Long type. Most machine shops should be able to do that. If it has a Mercury flywheel with 6 evenly spaced PP bolts then you could find a 49 to E51 Merc clutch pressure plate with Borg & Beck number 0988 or 1310 stamped on. Ft Wayne clutch could likely convert the late 51 to 53 PP or a model 10A7 PP to the 49 to E51 Merc PP configuration if asked. The 10" Springflex B&B/Mercury clutch plate with the 1 3/8" 10-spline hub might be the hard part but Ft Wayne clutch could likely fix up one of those too. I still find these old cores on flea-pay now and then but you have to ask for the B&B part number to be sure.