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What changes occurred through the production run?

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The CS saw minor changes over the 1968 to 1975 production run. The model year timeline below is not exhaustive, and is subject to edits/corrections:

Much of the details found below are crowd sourced and validated by numerous forum members. These discussions and discoveries occur in various informational threads, and are exhaustively compiled and maintained by @HB Chris. Thank you to all of the contributors. Your information will live on in the deep divide found on the forum, and the findings will be shared here.
 

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
  • 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
  • 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
  • Hood release door changes from push button to black twisting knob during 3.0CS production
  • 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
IMG_1517.JPGIMG_1516.JPG
  • Emissions sticker added to heater fan cover
IMG_1515.JPG
  • Motor mounts get added Stop Brackets
  • Zenith carbs and Thermo Starter Valve revised
  • Clamp holding Carbon Filter revised
  • Sheet metal exhaust manifold covers replace cast aluminum
  • Small plastic plugs added to inner fender seam near struts
  • Ignition coil and mounting bracket revised
  • A/C compressor is rotary style, no damping muffler needed in engine bay, belt changed
  • A/C drier bracket added below ignition coil, radiator has temp sensor on passenger side to turn on condenser fan at preset temp with a temp relay/switch box
IMG_1514.JPG
  • Radiator and lower radiator hose revised
  • BW Automatic gets a plastic overflow tank on passenger side of engine bay, dipstick and tube revised for hose
  • Pedal box/booster mount changed, brake and clutch pedals and pads narrower
  • 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
  • Wiper motor gets a plastic cover
  • Tension strut nut changed from castle nut to locking nut
  • Steering shaft changed to accommodate adjustable column
  • 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
Interior and Trim Changes
  • Upper door vinyl changed from basketweave to perforated vinyl
IMG_1524.JPG
  • 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
IMG_1501.JPG
  • Lower seat is longer
  • Horseshoe shaped chrome trim on bottom of seat is now metal instead of chromed plastic and much thicker
IMG_1509.JPG
  • Autoflug seatbelts have a new male tongue and receivers have revised shape with red pushbuttons
IMG_1511.JPG
  • 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
IMG_1500.JPG
  • 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 padded center hub
  • Brushed aluminum trim on dash rail is now one long piece instead of two pieces due to adjustable column
IMG_1504.JPG
  • Shift platform now holds the rear defrost switch instead of wiper speed, wiper speed functions moved to the right side stalk
IMG_1506.JPG
  • Turn signal switch moved to left side of column
  • Hood release door (oddments tray) has a receptacle for a rechargeable flashlight
IMG_1503.JPG
  • 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
IMG_1521.JPG
  • Toolbox is now a stronger one piece plastic with no lid, just foam on trunk lid as of perhaps 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
IMG_1520.JPG
  • Kidney grille may have received an 8 slat black plastic insert very late in 1974 that was designed for the e3
  • 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
IMG_1519.JPG
  • New paint colors available: Amazonas, Pastelblau, Jadegrun, Mintgrun, Sienabraun, Artisblau, Anthrazitgrau
 

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dave v. in nc

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Info worth including?
Relative to the above "bumpers changed to 2 1/2 mph...."As was discussed elsewhere last week, the front fenders/wings are same for 69-72, but the holes on the 73 (US only) where the bumper ends bolt through for attachment are further forward to mate to the bumpers that were extended for that year. Chris knew that, I didn't...
I don't know what the 74 US only does as far as attachment hole.
 

Markos

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@HB Chris ,

I accidentally deleted the steering column pic. Can you reattach in a reply? Also, I’m not sure what the remaining pics refer to. I think the wiper motor is the cover? Is that listed?

If you don’t like the pics online I will remove them. I was planning on shrinking the thumbnails also.
 

pmansson

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Very early 2800 CS had invisible rear screen demist wiring in the clear glass. Probably using up the 2000CS stock. My fatherś Jan 69 car had this. Wish I had not changed to green glass in 1983.
The front and rear emblems were enamel för the same reason.
And the front ashtray was above the large map/glove compartment
No head rests until 1970 or 71. I still have those seats in the car.
Grey, long, old style seat belts, perhaps dealer installed in Sweden.
 

HB Chris

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Thank you Peder. We could have an entire list of changes to euro coupes, it was hard enough to capture just US changes. I have never seen the the large ashtray but saw it in the parts book, would love to see a pic of one. The first 2800CS were built in Sep 1969 for us so probably arrived in Oct and of course we all got seatbelts and headrests as well as the green glass.
 

Markos

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Very early 2800 CS had invisible rear screen demist wiring in the clear glass. Probably using up the 2000CS stock. My fatherś Jan 69 car had this. Wish I had not changed to green glass in 1983.
The front and rear emblems were enamel för the same reason.
And the front ashtray was above the large map/glove compartment
No head rests until 1970 or 71. I still have those seats in the car.
Grey, long, old style seat belts, perhaps dealer installed in Sweden.
I have the grey seatbelts in my ‘71 euro. Still installed and awkward as hell.
 
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