Usage:
The new crankshaft seal conversion groups and crankshaft seal groups given above are available from the Parts Department. The 4W2568, 4W2569, 4W2570 and 4W2571 Crankshaft Seal Conversion Groups are used to convert earlier engines that have either a piston-type seal with a baffle and thrower, or later engines that have a lip-type seal and wear sleeve. The 4W2606 or 4W2607 Crankshaft Seal Group is used as a replacement seal group for those earlier engines that have been equipped with a conversion group, or those later engines that have the new type seal as original equipment. See the chart that follows for adaptability of the seal groups.
The new seal is quite different from the former seal because of the hydrodynamic groove in the sealing lip of the new seal. These grooves in the seal lip move lubrication oil back into the engine crankcase as the crankshaft turns. Because of this type design, the front seal group for an engine is different from the rear seal group. The installed position of the seal lip grooves is important, because the grooves are very sensitive to the direction of crankshaft rotation. If a specific seal group is installed on the wrong end of the engine, lubrication oil can actually be taken out of the engine, because the grooves in the seal lip are in the wrong direction in relation to crankshaft rotation. See the chart that follows for seal group use according to crankshaft rotation.
IMPORTANT: Because of the special design of these new seal groups, special handling and installation procedures are necessary, to help prevent additional failures.
(1) Seal Group Installation Tools
1 - 6V7831 Installer. 2 - 6V7829 Locator. 3 - 6V7834 Bolt (two), 1.00"-14 x 50.8 (2.0") long; 6V9442 Bolt (two), 7/8"-14 x 60.3 (2.4") long. 4 - 9S8858 Nut. 5 - 6V7833 Ring. 6 - 6V7799 Ring. 7 - 4B5271 Washer (six). 8 - 3B1915 Bolt (six), 3/8"-16 x 34.92 (1.375") long. Also needed, but not shown, are L1143 Bolts (six) 3/8" - 16 X 63.5 (2.50") long.
NOTE: Check thickness (A) of 6V7829 Locator (2). Thickness (A) must be 33.0 mm (1.300"). Any locator that is thicker than the 33.0 mm (1.300") dimension must be machined to the new thickness.
(2) Separation Of The Seal From The Sleeve Is Not Permissible
The material in the large lip of the seal can be damaged easily. Fingers, fingernails, wires or the edge of the sleeve can put a scratch on the surface of the seal lip. It is possible that a scratch or a rub (which can not be seen) from a finger, can damage the seal enough that it can not be used. In these seal groups, the sleeve is installed in the seal, by the seal group supplier, for two very good reasons, as follows:
- A. To give better protection to the special material on the seal lip.
- B. To make for easier installation. The seal and the sleeve are installed, both at the same time.
(3) Once There Is Separation Of A Seal And Sleeve, They Must Not Be Used Again
Once there is separation of a sleeve and seal, one from the other, they can not be used again. When you try to put the seal on the sleeve, or the sleeve in the seal, the sleeve will always damage the seal, and neither part can be used again. Always install a new seal group if there is separation of these two parts.
(4) Used Seal Groups - Do Not Use Again
During the disassembly procedure for engine reconditioning, the seal is separated from the wear sleeve. This means that the sleeve must not be used again. The lip of the seal will be damaged if it is installed over the wear sleeve. Destroy the original wear sleeve and seal. Install the correct seal group at time of engine assembly.
(5) Install Only Those Seal Groups That Are Still Assembled By The Seal Group Supplier
See items 2, 3 and 4. If during seal group installation, there is separation of the seal from the wear sleeve, remove and destroy both parts. Install a new seal group.
(6) Seal Groups Are To Be Installed Dry (No Lubrication)
Do not use any type of lubrication during installation of the seal group. The seal group will install quite easily without lubrication, if the correct tools and procedure are used.
NOTE: If any type of lubrication is used in the installation of the seal group, the result can be an early failure of the seal.
Installation Of A 4W2568, 4W2569, 4W2570 Or 4W2571 Crankshaft Seal Conversion Group
These crankshaft seal conversion groups are replacement seal groups for those engines that have a piston-type seal with a thrower and baffle, or as a replacement for those later engines that have a lip-type seal and a wear sleeve. Use the procedure that follows for seal removal and seal conversion group installation for these specific engines.
(1) For those engines so equipped, remove rear baffle (1), thrower (2) and ring (3) from flywheel housing (4).
| NOTICE |
|---|
If ring (3) is not removed, it will cause damage to the engine. |
(2) For those engines so equipped, remove adapter (5), baffle (6), thrower (7) and ring (8) from front accessory drive housing (9).
| NOTICE |
|---|
If ring (8) is not removed, it will cause damage to the engine. |
(3) For those engines that have a lip-type crankshaft seal, remove the seal with its adapter; then remove wear sleeve (10).
NOTE: Some engines that have the lip-type seal with wear sleeve, also have an O-ring seal (11) in groove (A), under the wear sleeve. O-ring seal (11) must also be removed.
(4) Remove any burrs or sharp particles from surface (B) of the crankshaft. Use 6V1541 Quick Cure Primer to clean surface (A) and (B).
(5) To assemble a front seal group, put a 6V7833 Ring (C), the correct seal group (12), and 4W2566 Adapter (13) on 6V7799 Ring (14). Wear sleeve (15) of the seal group must be in the position shown in the inset. Install six 3B1915 Bolts (16) with 4B5271 Washers as shown. Tighten bolts (16) evenly, with a maximum of two turns at a time for each bolt, to pull the seal group into adapter (13), until the seal is at the bottom of the adapter bore. Remove the tools after the seal group is installed in the adapter.
NOTE: Wear sleeve (15) must not be separated from the seal. If the seal and wear sleeve are ever separated, they must not be used. See the special handling procedures at the front of this instruction.
(6) To assemble a rear seal group, put a 6V7833 Ring (C), the correct seal group (17) and 4W2567 Adapter (18) on 6V7799 Ring (14). Wear sleeve (19) of the seal group must be in the position shown in the inset. Install six L1143 Bolts (16) with 4B5271 Washers as shown. Tighten bolts (16) evenly, with a maximum of two turns at a time for each bolt, to pull the seal group into adapter (18), until the seal is at the bottom of the adapter bore. Remove the tools after the seal group is installed in the adapter.
NOTE: Wear sleeve (19) must not be separated from the seal. If the seal and wear sleeve are ever separated, they must not be used. See the special handling procedures at the front of this instruction.
(7) To install a front seal group, use two bolts (20) (use two 6V7834 Bolts for D399 Engines; use two 6V9442 Bolts for D398 or D379 Engines) to fasten 6V7829 Locator (21) in place.
(8) Use 6V1541 Quick Cure Primer to clean the inside diameter of the wear sleeve and the outside of the crankshaft flange and locator (21). Put 9S3265 Retaining Compound on the inside diameter of the wear sleeve and on the outside diameter of the crankshaft flange.
(9) Put two guide pins (22) in the front cover as shown. (Guide pins can be made by cutting the head from two S1619 Bolts.)
(10) Put a 5L2093 Gasket on guide pins (22), then install adapter (13) on the guide pins. BE CAREFUL NOT TO SEPARATE THE WEAR SLEEVE FROM THE SEAL.
NOTE: For those engines that have front auxiliary drive gears, position slots (D) of adapter (13) so they will be clear of the idler gear stub shaft.
(11) Install 6V7831 Installer (23) and 9S8858 Nut (24). Tighten nut (24) until installer (23) is solid against locator (21). Remove the tools and assemble the engine.
(12) To install a new seal group at the rear of the crankshaft, do the procedure shown in Steps 6 to 11.