E9 Changes: '69 to '74

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HB Chris

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Changes from 2800CS to 3.0CS for US/NA Market

Mechanical and Engine Bay Changes

  • Engine enlarged from 2.8L to 3.0L, US compression revised from 9.0:1 to 8.0:1, early 2800CS oil pan has no baffles and oil pressure switch is mounted at lower end of end vs. upper portion of head
  • 2800CS uses Zenith carbs 1256525, 3.0CS and CSA uses 1255952 up to 3.0CSA 2250246 which then uses 1257594
  • Stop brackets added next to motor mounts at 2240391 and 2250319.
  • Throttle stop added at bell crank on 3.0CS
  • Manual transmission changes from ZF to Getrag
  • Automatic transmission changed from ZF to Borg Warner at 2250188, shift lever originally straight and becomes T shaped
  • Fuel tank enlarged from 55l to 70L during 2800CS production, remains 70L in 3.0CS
  • Front stabilizer 17mm in both
  • Front struts and steering arms change at 2800CS 2270032 and 2800CSA 2280010 to accommodate change from m8 to m10 lock wire bolts.
  • Front strut bearing has longer studs and a new strut spacer for US regulations at 2270244 and 2280266
  • Solid brake rotors and rear drum brakes in 2800CS replaced by vented discs all around on 3.0CS, rear trailing arms and rear hubs changed
  • Brake booster changes from pancake style to thicker style at 2240222 and 2250146, Master Cylinder diameter changes from 23.8mm to 22.2mm
  • Differential 3.45 (38/11) in 2800CS, 3.64 (40/11) in 3.0CS, locking optional
  • Exhaust system changed from resonator and muffler in 2800CS to two resonators and one muffler in 3.0CS, tailpipe changes from 55mm to 60mm as well
  • Air cleaner has a rubber plug to access the preheat mechanism, this changes to an external mechanism during 3.0CS production deleting the plug, intake hose is 60mm changing to 70mm, preheat hose changes from 50mm to 60mm, changes occur at 2240377 and 2250316. Cover clips changed from solid straps to wire clips on 3.0CS during production
  • Emissions equipment changes from one speed relay and one electro-changeover valve in 2800CS to two speed relays and two changeover valves in 3.0CS. EGR valve and balance tube between carbs added to 3.0CS at 2240319 and 2250247 as well as an exhaust gas filter and exhaust manifold changed to have an EGR port.
Interior and Trim Changes
  • Early 2800CS have no aluminum trim on backrests
  • Seatback release lever at bottom of seat moves to backrest at 2270350 and 2280370 on 2800CS
  • Headrests change from flat to peaked at the top corners during 3.0CS production at 2240543 and 2250439, posts still 10mm
  • Heater/Vent fascia uses international symbols, 3.0CS has words with internal illumination added during 3.0CS production
  • Instrument font is ivory, white in 3.0CS
  • Clock changes from mechanical to quartz during 3.0CS production
  • Tach redline is 6200 rpm in 2800CS, 6400 rpm in 3.0CS
  • Window motors change from sardine can style to improved integral motors at 2240634 and 2250501 which includes circuit breakers under dash, revised switches without ridge in center and with pins instead of spades, revised regulators and plastic door access plugs deleted, rear door card trim strip lengthened
  • Manual sunroof in 2800CS(?), 3.0CS has manual or electric
  • Klippan fixed belts with plastic clip to hold female receiver on handbrake and shoulder belt mounted behind rear seat armrest changed to retractable Autoflug belts at 2240143 and 2250071 along with ceiling mounted shoulder belt with a shelf to hold shoulder belt when not in use
  • Seatbelt warning light pod on dash added when belts changed to Autoflug at 2240143 and 2250071
  • Hood release door changes from push button to black twisting knob during 3.0CS production
  • Headlight adjusters change from small black plastic knob to long white knob at 3.0CS intro
  • Emergency flasher switch moves from under dash to dash rail on 3.0CS, switch surround changes from stamped 69 to 72 and a resistor is added to the switch
  • Changes made to wiring harness
  • US market coupes arrive with A/C components ordered by Hoffman in the trunk for installation at the port or dealership
  • Radios and manual or electric antennas available and installed by the dealer. Factory lists Blaupunkt mono and Becker manual, stereo and cassette models as available, dealers may have sold other brands as well. Noise suppression devices were available
Exterior Changes
  • Kidney grilles have ten polished slats on all coupes
  • License plate panel chromed brass on 2800CS, some have a small red reflector covering the license plate mount on 2800CS, perhaps a dealer installed item
  • Tail lights have red turn signal lenses on 2800CS
  • Hood and fender grilles begin as chromed metal, change to partial satin/matte chromed plastic in early 3.0CS production and to black plastic during production (per the Parts book: at 3.0CS 2240645 and 2250504 all dark colors now get matt chrome, all light colors now get black grilles)
  • All coupes have a driver side trapezoid mirror, passenger side a dealer installed option
  • Wiper arms and blade holders change from chrome to satin on 3.0CS
  • Wiper squirters under hood moved to plastic squirters on hood of 3.0CS
  • Trunk badge on 2800CS has separate letters for the C and the S and are not as tall as the 3.0 CS
  • Bumpers changed to 2 ½ mph DOT requirements, front bumper brace strengthened, rear bumper mount uses a hoop with a cover, bumper ends get a metal/rubber mounting to body and mounting holes in fender moved, front guard rubber shape changes to more rounded shape, rear under riders get a spacer between guard and body, all changes at 3.0CS 2240391 and 2250319
  • License plate lights move from bumper to tail panel on 73 3.0CS at the same time, chrome plastic caps used to fill holes in bumpers
  • Front valance changes on 3.0CS in late 73 for 74 production with smaller slots on outer sides
  • Paint colors on 2800CS not available on 3.0CS: Nevada, Florida, Bristol
  • Paint colors on 3.0CS not available on 2800CS: Verona, Amazonas, Granatrot, Siennabraun, Fjord, Taiga, Ceylon, Turkis, Pastelblau, Anthrazitgrau, Arctisblau, Jadegrun, Mintgrun
  • Paint colors on both: Malaga, Atlantik, Colorado, Schwarz, Golf, Chamonix, Granada, Sahara, Inka, Riviera, Baikal, Tundra, Nachtblau, Polaris
 

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HB Chris

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Changes from 73 to 74 3.0CS US/NA market specific

Mechanical and Engine Bay Changes

  • Bell housing and slave cylinder from round slave to bolt on slave, T/O bearing and release arm revised
  • EGR plumbing and exhaust filter added above valve cover, exhaust manifolds revised, added emissions dashpots and vacuum hose and now has three electro-reversing valves (dashpots) on firewall
  • Belt for power steering pump moves from water pump to crankshaft pulley, PS pump brackets changed and shorter belt utilized.
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  • Emissions sticker added to heater fan cover
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  • Motor mounts get added Stop Brackets (now 2 on each side)
  • Zenith carbs and Thermo Starter Valve revised and now use 1259612 for manuals and 1259613 for automatics
  • Clamp holding Carbon Filter revised
  • Sheet metal exhaust manifold covers replace cast aluminum
  • Small plastic plugs added to inner fender seam near struts
  • Sound pads/fender cladding now has small dimples embossed in addition to hexagon pattern
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  • Ignition coil and mounting bracket revised
  • A/C compressor is rotary style, no damping muffler needed in engine bay, belt changed and adjustable mounting bracket changes
  • A/C drier bracket added below ignition coil
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  • Radiator and lower radiator hose revised; fan shroud, control box, relay and temp sender added (during MY74 production) to engage auxiliary fan in front of radiator at a preset temperature (also used on automatics without A/C in euro Model 73 coupes)
  • BW Automatic gets a plastic overflow tank on passenger side of engine bay, dipstick and tube revised for hose (actually at 2250738)
  • Pedal box/booster mount changed, brake and clutch pedals and pads narrower, large spring added behind clutch pedal
  • Fuel tank enlarged from 70 to 72L, now mounted from below trunk, fuel return line added from carbs to tank
  • Fan clutch changed from mechanical to viscous, fan also changes at 4310304 and 4335367
  • Coolant tank may have changed to plastic from painted brass requiring different coolant hose to manifold
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  • Wiper motor gets a plastic cove
  • Tension strut nut changed from castle nut to locking nut
  • Steering shaft changed to accommodate adjustable column
  • Front strut bearings use 3 regular nuts instead of a domed nut and thick washer
  • Front stabilizer bar increased to 23mm from 17mm, clamp and rubber bushing enlarged
  • Rear stabilizer bar became optional and may not have been ordered by Hoffman
  • Rear subframe mount changed from universal to right and left handed
  • Alloy wheels change to BMW FPS Alpina style 20 spoke during production
Interior and Trim Changes
  • Upper door vinyl changed from basketweave to perforated vinyl
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  • One piece carpet introduced during production in April or May of 1974, rear parcel shelf is now carpet instead of black vinyl
  • Seat pleats changed from vertical to horizontal, shoulder is now sewn and not tucked, headrest posts are now 12mm vs 10mm
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  • Lower seat is longer
  • Horseshoe shaped chrome trim on bottom of seat is now metal instead of chromed plastic and much thicker
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  • Autoflug seatbelts have a new male tongue and receivers have revised shape with red pushbuttons
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  • Front seatbelts have retractor inside rear armrest cover which is wider with a slot for the belt with a hook under the rear quarter window and a movable triangle to keep belts elevated at shoulder height
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  • Steering column adjustable in and out with lever under column, upper and lower covers changed and are now plastic
View attachment 82165
  • Ignition lock revised
  • Steering wheel changed to four spoke faux leather with removable padded center hub
  • Brushed aluminum trim on dash rail is now one long piece instead of two pieces due to adjustable column
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  • Shift platform now holds the rear defrost switch instead of wiper speed, wiper speed functions moved to the right side stalk
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  • Turn signal switch moved to left side of column
  • Hood release door (oddments tray) has a receptacle for a rechargeable flashlight
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  • Changes made to wiring harness, wire thickness changes, low beam/fog relay added, A/C fan switch revised which eliminates change-over relay at fuse block, seat belt interlock system added (relay under rear passenger seat), seatbelt warning pod has internal changes
  • No trunk caddy due to bumper supports, trunk boards narrower due to frame bracing, wood rail on driver side spare tore board shorter
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  • Toolbox is now a stronger one piece plastic with no lid, just foam on trunk lid as of perhaps 4th quarter of Dec 1974
Exterior Changes
  • US/NA market coupes get a 5 mph shock absorbing bumper, front frame rail wider and long supports added inside trunk with longer plastic elephant skin covers
  • Electric outside mirrors become available as an option at 4310329 and 4335392 replacing trapezoid mirrors. Flag mirrors never appeared on US coupes as they were introduced in early 1975
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  • Kidney grille 'may' have received an 8 slat black plastic insert very late in 1974 that was designed for the e3 MY74 sedans
  • Wiper arms and blade holders are now black
  • Wiper squirters on hood may have changed during late production and are longer with two sprayer jets each
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  • New paint colors available: Amazonas, Pastelblau, Jadegrun, Mintgrun, Sienabraun, Artisblau, Anthrazitgrau
 

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