Rolls-Royce 20/25 - installed traps



Split pins

Split cotter pins should be twisted through 90 degrees so that the legs can be wrapped around the nuts rather than bent over the end of the bolt.  This is standard Roll-Royce procedure.

In the case of sludge trap split pins, failure the fit in the prescribed manner may result in the pin legs fouling the con rods.

It is important that the pins, once installed, are rigidly located.  If the pins are loose they will eventually stress-fracture and fall out.

crank : end on

All sludge traps installed.  This shot showing the front trap.

The majority of the bolts are fitted with the peened nut facing forward: the exceptions being main bearing #7 and big end #4.  This is a matter of personal preference and possibly something to do with anal retention.


Here because it is such a pretty picture.

The next job will be to test the crankshaft to prove that the traps have sealed.  All mating faces were treated with a soft-setting anaerobic sealant (Truloc #271) and the threads and washers with soft thread sealant (Truloc #375).