Show whole topic Oct 19, 2018 5:10 pm
h14 Offline
Member
Registered since: Nov 30, 2008
Location: Chalandray, France


Subject: Re: rear main bearing 38 v-12
Hi,
I bought a rear crankshaft seal from the Club Spares many years ago,
which was fitted as part of the professional engine rebuild; so I can't offer fitting advice. The V12 spares offered by the Club today include GSKV05 "Crankshaft oil seal, V12", but doesn't state if it's front or rear.
Removing the "pan" will get you nowhere, despite the length of time taken to undo and remove the vast number of nuts and bolts! All you will see is more aluminium casting.
The V12 engine has no bellhousing, as the gearbox is separately mounted. It follows therefore that it MAY be possible to change this seal with the engine in situ. You would need to remove the cardan shaft (absolutely essential to replace all the nuts, bolts and washes in their original locations), clutch assembly and flywheel.
Welcome to the world of V12 ownership, but bear in mind rule number one. No small or apparently easy job is possible on the V12 without having to do at least one otherwise unnecessary major job first.
Before doing anything at all, you need these essential publications:
Original factory handbook; fortunately almost a workshop manual. You will need to establish if your engine is Sanction 1, or 2, as firing order and camshaft settings differ.
Motor Trader Supplement for the V12. Published in 1939, this fills in the spaces left by the handbook. as with the handbook, the Club can supply a reprint, but do note the photographs in the original are much clearer.
The Club's own Revised Owners Manual for the V12; this includes the combined knowledge of many members, with much hands-on information.
Donald Bastows book on W O Bentley is highly informative, with copy blueprints, photos etc ... but it is highly technical!
Laurence