Torque Ball Seal Assembly-MPD Style-Aluminum Housing-Use with Ford, Mopar V-8 & Fontana Midget Engines-Part#TBS1A07
Assembly includes seal and cup.
The Seals-it Torque Ball Seal MPD style was designed to what appeared to be the most common motor plate style currently being used.
The aluminum "MPD" style bell housing and the steel "DMI" style housing are the only ones where we have physical confirmed the fit. To our knowledge, these comprise the vast majority of the parts in the field, and other bell housings, such as the Winters aluminum bell housing and the DMI aluminum housing appear similar to MPD, however, it is incumbent on the customer to trial fit the parts and confirm the fit.
The motor plate should be a "nominal" thickness of .375 (3/8"), +/- .019 (1/64"), with an I.D. hole of 6.0", +/- .019 (1/64"). Plate thicknesses or hole dimensions other than those specified WILL CAUSE PART MALFUNTION.
The only engine style this design fits is the Chevrolet crank shaft flange bolt pattern of 3.580" diameter, which is the most common in use. Note that this is the flange pattern used on the two piece oil seal crank shafts.
There may be some groups that require the use of "stock" crank shafts. One piece rear main seals used after 1986 have crank shafts with a 3.00" bolt pattern. The "cup" will not fit these.
The seal is placed between the firewall casting ad the engine plate with the rubber of the seal facing towards the rear end.
The rubber fits inside of the firewall casting and requires a casting that the I.D. is large enough to allow the seal to fit inside.
This seal can also be used with Ford, Mopar V-8 and Fontana midget engines without the cup.
With the proper O.D. of joint flange, this seal will locate within thousandth of clearance to the U joint flange.