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TD-TF transmission

To: mgt mailing list <mg-t@autox.team.net>
Subject: TD-TF transmission
From: bullwinkle <yd3@nvc.net>
Date: Thu, 23 Mar 2000 15:50:15 -0800
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


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