Because it doesn’t have a torsional vibration damper the LUC in the L51 model converter (SACHS WA4/W280 S-2GWK) is particularly sensitive to being set up correctly.



The total piston movement, on to off, is only 1mm and the retainer for the piston return springs - which double as tangential driving straps - is friction welded into place so has to be turned off on a lathe and then accurately re-welded in the correct position once the friction plate has been replaced.







For that reason torque converter remanufacturers shy away from this particular model or, if they do offer to recondition it, may not risk attempting to replace the LUC. I’d strongly recommend therefore that you find somewhere that has a lot of experience with this particular model.

Phil (aka Bemble on landrovernet)