Thread: Pulley removal using Difflock Viscous fan spanner

Have discovered that the 4.0/4.6 V8 pulley can be removed/replaced using one of the difflock spanners normally used for the Viscous Fan coupling.

Items needed
* The Difflock spanner with multiple holes drilled
* 2 x 50mm hex head (13mm) high tensile M8 x1.25 bolts
* two surplus 5/8 1/2"drive sockets (use as spacers)
* 24mm 6pt impact socket
* long bar with 1/2" drive

To remove the pulley, loosely bolt the spanner to the pulley using the 50mm bolt through the furthest hole in the jaw end of the spanner and using one of the sockets as a spacer. Rotate the spanner so that the other end rests on the Right Hand chassis rail (the engine in the P38 is off-set to the right...spanner is too short to reach the LH chassis rail). Rotate the pulley slowly clockwise using the 24mm socket so that the second bolt hole in the jaw end of the Difflock spanner comes into the arc of the other hole in the pulley. Slide the other socket in and bolt the Difflock spanner to the second hole. Now fasten both 50mm bolts evenly until the difflock spanner is snugly attached. Using the 24mm socket, remove the pulley bolt.

Rotate the engine slowly clockwise raising the Difflock spanner off the chassis rail, then carefully work the Difflock spanner back and forth to release the pulley from the woodruff key and slide it off the crankshaft. A piece of wood between the block and the difflock spanner may help to lever the pulley off.

To replace, simply rotate the crankshaft such that the pulley slides back fully but the end of the difflock spanner extends under the RHS chassis rail.
Then eat plenty of tucker to get enough strength to tighten the bolt to 270 NM (200 ft lb )!!


[/IMG]


Difflock spanner extended under RH chassis rail prior to fully tightening crankshaft retaining bolt.



NOTE: Can also use same spanner bolted to diff flanges to retain them while undoing pinion nut to change pinion oil seals

Originally Posted by Hoges

Have discovered that the 4.0/4.6 V8 pulley can be removed/replaced using one of the difflock spanners normally used for the Viscous Fan coupling.

Items needed
* The Difflock spanner with multiple holes drilled
* 2 x 50mm hex head (13mm) high tensile M8 x1.25 bolts
* two surplus 5/8 1/2"drive sockets (use as spacers)
* 24mm 6pt impact socket
* long bar with 1/2" drive

To remove the pulley, loosely bolt the spanner to the pulley using the 50mm bolt through the furthest hole in the jaw end of the spanner and using one of the sockets as a spacer. Rotate the spanner so that the other end rests on the Right Hand chassis rail (the engine in the P38 is off-set to the right...spanner is too short to reach the LH chassis rail). Rotate the pulley slowly clockwise using the 24mm socket so that the second bolt hole in the jaw end of the Difflock spanner comes into the arc of the other hole in the pulley. Slide the other socket in and bolt the Difflock spanner to the second hole. Now fasten both 50mm bolts evenly until the difflock spanner is snugly attached. Using the 24mm socket, remove the pulley bolt.

Rotate the engine slowly clockwise raising the Difflock spanner off the chassis rail, then carefully work the Difflock spanner back and forth to release the pulley from the woodruff key and slide it off the crankshaft. A piece of wood between the block and the difflock spanner may help to lever the pulley off.

To replace, simply rotate the crankshaft such that the pulley slides back fully but the end of the difflock spanner extends under the RHS chassis rail.
Then eat plenty of tucker to get enough strength to tighten the bolt to 270 NM (200 ft lb )!!


[IMG][/IMG]


Difflock spanner extended under RH chassis rail prior to fully tightening crankshaft retaining bolt.



NOTE: Can also use same spanner bolted to diff flanges to retain them while undoing pinion nut to change pinion oil seals

thanks now
Now I know that I can use mine for other things.