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Morgan TR engined Plus 4 Clutches Summary

To: emog@lyris.dundee.net
Subject: Morgan TR engined Plus 4 Clutches Summary
From: deemi@juno.com
Date: Thu, 16 Jun 2005 17:19:44 -0400
Morgan Clutch Summary  (multiple sources on emog thanks!) Please review
and let me know if you find mistakes or could add to this summary!  Feel
free to use this as well, best of luck.  Lorne can you put this somewhere
on the site?

Best regards,

Bob Bowie in Maine


Flywheel

the flywheel is same as TR3/4 for all plus 4 years, it  has TWO dowel
pins and is about 11.25 inches diamter. it has the sweat on ring gear 
The flywheel is 1 and 7/16 thick at the edge.  This includes the ring
gear.
Number of bolts that hold the clutch pressure plate to the flywheel 6

Sources
flywheels are not listed as available, ring gears had moss and the
Roadster factory as sources,
some racing outfits offer alloy flywheels.

Mistakes, 
the TR4a flywheel is smaller at 11 inch diameter and has three pin
locaters, there is a an MGB pressure plate fix with the 8.5 inch clutch
plate from a TR4A/TR6 that requires a new hole in the throwout to give
proper throw out clearance (see Morgan Bedside Reader-Greg Solow made
this 
conversion)

Clutch Plate:  
Originally Borg and Beck 9 inch single dry  plate
the clutch plate is 9 inch diameter, same as TR4  (actually TR3  from
1955 on at least)
Girling application book: The driven plate is 85824/00RP
Driven plate: Borg & Beck 50052, Delphi # LL50J
?Automotive products HB9715Q 
BAP-GEON  New part number 45692/15 Rebuilt part number 47344  (by the way
lists the same part number for tr3/4 and Austin Healey 100/4  to 1956,
100/6 - 1957-?1962 (I thought they changed to 3000 in 59!)
also found CD344 

Sources:
Most all vendors

Mistakes
the TR4a clutch disc is smaller than the TR4!  dont use it in a standard
Morgan setup. (Greg Solow and Fred Sisson can tell you how to use one)


Pressure Plate: 

the Pressure plate is same as early 100-4  Austin-Healey and goes into
early 100-6 series as well.
May be Pressure plate: Borg & Beck # 45692/15 and/or 34H44
  HA3359Q (?Automotive products number)    
also reference CC344 found




Sources
Linda at Morgan Spares does have these in Stock Pressure Plate 100-372 
Moss may have them 
Melvyn Rutter rebuilds them
They have been made by Automotive Products plc of Leamington Spa,
England.

Mistakes:
Dont use a Triumph Pressure plate for TR engine Morgan as the throw out
bearing will hit teeth.


I have a note that mentions another source also for the throw out bearing
? early JAg xk120?

worries, ?questions

Summary

if you measure your flywheel and its just 11 inches  consider the Sisson
fix, or if thats what all you can find.
If you want original, your going to need a TR3/4 two dowel type flywheel
11 i
a good machinest can also fix this issue.  The size of the flywheel and
clutch assembly got smaller at the TR4a, but not for Morgans.

now will the M418G (tr4 type) starter fit TR3 flywheel.

Bob Bowie

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