Shop manual states hypoid 90 for summer, 80 for winter.
Shell lubrication chart X573 3rd edition states Shell Spirax 90EP
Torque specs from WKF Wood's book: (Sturvenant Co.)
-----------------------------------
Cylinder head studs 50 lbs./ft. 42
Main bearing caps 63 63
Con rod big end bolts 27 27
Gudgeon pin clamp bolts 33
Rocker shaft 8mm bolts 29
Rocker shaft 10mm bolts 43
Timing cover bolt 21
Flywheel to crank bolts 32
Clutch cover bolts 32
manifold clamping nuts 19
Spark plug 30
The following data is from the P.A. Sturtevant Co.'s torque
specifications book:
Metric Standard: (This is the diameter used on the MG engine, but
I think these are coarse pitch, i.e. 8mm is 8x1.25 and not the
8x1.00 used on MG.)
--------------------------------------------------------
Grade of Bolt 5D 8G 10K 12K
size 6mm 5 6 8 10 lbs./ft.
size 8mm 10 16 22 27
size 10mm 19 31 40 49
size 12mm 34 54 70 86
size 14mm 55 89 117 137
size 16mm 83 132 175 208
size 18mm 111 182 236 283
size 22mm 182 284 394 464
size 24mm 261 419 570 689
Whitworth Standard: (I think this is coarse not BSF)
Grade of bolt: A&B S T V
size 1/4 5 7 9 10 lbs./ft.
size 5/16 9 15 18 21
size 3/8 15 27 31 36
size 7/16 24 43 51 58
size 1/2 36 64 79 89
size 9/16 52 94 111 128
size 5/8 73 128 155 175
size 3/4 118 213 259 287
size 1/8 186 322 407 459
size 1 276 497 611 693
The sump bolts from Wood's chart are 6mm holding an alluminium
piece to the cast iron block. The bell housing bolts are 8mm
holding an alluminium part to cast iron and alluminium. The
sump's torque from Wood's chart is 32 lbs./ft., way higher than
any given on the Sturtevant Chart. The Timing cover bolts are
also 6mm going into cast iron. The rocker shaft 8mm is for a nut
on a stud, and not a bolt into cast iron. I think there may be
an error on Wood's chart. Half of the bolts used to hold the
bell housing on are going into alluminium, which is easily
striped. I've seen many blocks with bodgered threads in the
alluminium sump where the transmission bolts up. Unless you can
get
a definitive answer from some authority, such as John Twist at
University
Motors, <johntwist@universitymotorsltd.com> I would use the chart
and
stick with 22 or 27 lbs./feet
|