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Crankshaft Repair Sleeve Installation Instructions - Rear Main Seal Sleeve
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Reference · 1992-1996 BroncoAll 142 service procedures
Installation instructions for a crankshaft repair sleeve (use with one-piece full-circle seals): 45-degree .050 in chamfer, grind aluminum fingers .010, lubricate full 360 degrees; Made in USA.
Part of 1992-1996 Ford Bronco Service Procedures
This document is a photographed instruction card titled "Installation Instructions - Crankshaft Repair Sleeve," shown alongside the installation tool/sleeve in its packaging. It provides an eight-step procedure for installing a crankshaft repair sleeve used with the rear main seal. Key points include: the sleeve is for one-piece full circle seals only (two-piece seal applications must be checked in the catalog); the seal surface must be clean, free of burrs, and no stud-lock type material should be used; a 45-degree, .050"-wide chamfer on the receiving edge of the crankshaft flange is recommended, though field practice often omits it (at the installer's own risk). If the seal block has three aluminum fingers extending toward the crankshaft, they must be ground back approximately .010" for sleeve clearance. The sleeve is installed with the proper installation tool, tapped sharply to seat firmly once it bottoms out. The rear main seal's "wet lip" must sit square to the crankshaft flange, and both seal and sleeve must be lubricated over the full 360° of contact surface for proper start-up. Step 8 covers undersize sleeves: the crankshaft must be ground at the seal groove area to the catalog-specified finished diameter, restoring the seal wear area to standard diameter. The card is marked "Made in U.S.A." No years, models, or part numbers appear on the document itself.
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Frequently asked questions
- What type of seal is the crankshaft repair sleeve designed for?
- It is for use with one-piece full circle seals only; the catalog must be checked for applications on two-piece seals.
- Do I need a chamfer on the crankshaft flange before installing the repair sleeve?
- A 45-degree, .050"-wide chamfer on the receiving edge is recommended, and most crankshafts already have a sufficient chamfer. Field practice often omits the chamfer since the thin sleeve material doesn't interfere when the flex plate is torqued to the crank flange, but installing without a chamfer is at your own risk.
- What if the seal block has aluminum fingers that interfere with the sleeve?
- If the seal block has 3 aluminum fingers extending toward the crankshaft that interfere with the installed sleeve, grind the ends of the fingers approximately .010" for sleeve clearance.
- What extra step is required for an undersize repair sleeve?
- Per Step 8, the crankshaft MUST be ground at the seal grooved area to the finished diameter noted in the catalog. Installing the undersize sleeve then brings the crankshaft seal wear area back to standard diameter.
- How should the seal and sleeve be lubricated?
- The seal and repair sleeve must be well lubricated over the full 360° of contact surface for proper start-up lubrication, and the seal's "wet lip" must be square with the rotating mass of the crankshaft flange.
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