Engine Serial Numbers

From Citroen SM Wiki

(I know that this has major errors, but it's a start) -- Brucem 05:08, 19 August 2008 (UTC)

Models

Type Serial Number Size Fuel Trans Destinations Notes
C114/1 200.xxx? 2670 cc Carbs Manual (all)
C114/3 2670 cc IE Manual ?
C114/11 2995 cc ? Auto Europe
C114/04/1 2995 cc Carbs Manual USA / Canada
C114/12 2995 cc Carbs Manual USA / Canada
C114/04/2 2995 cc Carbs Auto USA / Canada
C114/13 2995 cc Carbs Auto USA / Canada
Merak SS 520.xxx Carbs (all)
Merak SS 600.xxx Carbs (all)

Technical Notes and Engine Revisions

Note that the dates represent the date of the Technical Note, which may be months after the change was made on the assembly line.

Serial Number Modification Technical Note Date of Note
100.001 - 103.567 old oil pressure valve TM 799/71 1971-10-13
103.568 new oil pressure valve TM 799/71 1971-10-13
105.503 old chain guiding TM 724/72 1972-03-29
106.289 oil inlet support TR 1206/73 1973-01-24
106.446 engine ventilation TR 419/72 1972-04-19
106.964 chain tensioner TR 423/72 1972-04-19
106.469 - 106.963 intermediate solution 5mm pin chain tensioner 1972-04-19
106.789 cylinder headgasket 5 420 933 TM 736/72 1972-04-24
107.096 valve springs 5 405 730 Repairers Guide I
107.097 valve springs 5 420 009 Repairers Guide I
R 108.570 waterpump gasket TR 1250/74 1974-11-19
150.001 - 150.122 engine ventilation (from 1972-01) TR 419/72 1972-04-19
150.122 chain tensioner TR 423/72 1972-04-24
150.122 cylinder headgasket 5 420 933 TM 736/72 1972-04-24
150.122 oil inlet support TR 1206/73 1973-01-24
R 150.253 waterpump gasket TR 1250/74 1974-11-19
200.233 oil inlet support (from 1972-01) TR 1206/72 1973-01-24
200.233 engine ventilation TR 419/72 1972-04-19
200.263 chain tensioner TR 423/72 1972-04-19
200.233 - 200.262 intermediate solution 5mm pin chain tensioner 1972-04-19
200.263 cylinderhead gasket 5 420 933 TM 736/72 1972-04-24
200.580 oil inlet support (from 1972-04) TR 1206/72 1973-01-24
200.620 valve springs 5 420 009 Repairers Guide I
250.005 engine ventilation TR 419/72 1972-04-19
250.005 oil inlet ... ('oelansaugsieb') TR 1206/72 1972-01-24
250.045 chain tensioner TR 423/72 1972-04-19
250.005 - 250.044 intermediate solution 5mm pin chain tensioner 1972-04-19
250.037 cylinder headgasket 5 420 933 TR 736/72 1972-04-24
250.362 oil inlet support (from 1972-04) TR 1206/72 1973-01-24
250.483 oil inlet support (from 1972-10) TR 1206/72 1973-01-24
300.001 valve springs 5 434 449 Repairers Guide I
300.150 oil inlet support TR 1206/73 1973-01-24
301.749 valve springs 5 445 235 Repairers Guide I
301.893 oilsump sealing TR 1252/73 1973-07-13
301.626 cylinderhead gasket TR 1253/73 1973-07-13
301.881 main bearing TR 1270/73 1973-12-19
302.945 bigend dimension TR 1270/73 1973-12-19
303.344 waterpump gasket TR 1250/74 1974-11-19
350.001 development TR 1270/73 1973-12-19
350.159 main bearing TR 1270/73 1973-12-19
350.151 gudgeon pin TR 1270/73 1973-12-19
350.177 bigend dimension TR 1270/73 1973-12-19
400.001 valve springs 5 434 449 Repairers Guide I
400.466 valve springs 5 445 235 Repairers Guide I
400.534 oilsump sealing TR 1252/73 1973-07-13
400.623 cylinderhead gasket TR 1253/73 1973-07-13
400.649 waterpump gasket TR 1250/74 1974-11-19
400.551 crankshaft and block
400.339 piston pins
400.631 oil inlet support
450.001 valve springs 5 434 449 Repairers Guide I
450.508 valve springs 5 445 235 Repairers Guide I
450.546 oilsump sealing TR 1252/73 1973-07-13
450.639 cylinderhead gasket TR 1253/73 1973-07-13
450.664 waterpump gasket TR 1250/74 1974-11-19
450.590 crankshaft and block
450.408 piston pins
450.639 oil inlet support
450.687 camshaft chain

Other information to fold in

  • Question -- How to fold in John's comment:
The first part is incorrect: 200.xxx is 2.7 liter manual 
transmission; 250.xxx is 2.7 liter automatic transmission 
irrespective of date of manufacture; similarly 400.xxx and 450.xxx

I don't see a engine type for 2.7 Auto... -- Brucem

  • Just saw this post of Andrew's after this work. Needs to be folded in, will perhaps result in table reorganizations:
A & B rods are interchangeable, as are ALL rods within weight classes.
Engine numbers.
100.999 2.7 Carb Europe
200.999 2.7 US Manual
250.999 2.7 US Auto
300.999 2.7 Inj all types
350.999 3.0L Auto Europe
400.999 3.0L US 5 Spd
450.999 3.0L US Auto
500.999 3.0L Merak
520.999 3.0L Merak SS

There are only really 2 types of engine regardless of number. SS and the rest.
2.7L Carb, have unique cams. 2.7Inj, 3.0L Carb, SS cams are identical.

Early 2.7L heads are slightly different to later engines but can be used on
later engines though not ideal. There are lots of very minor changes to the
heads thereafter, but if valve spring assemblies are retained with the head
it will serve on any engine except SS.

Block, crank, pistons, valves & heads, rocker covers, from SS are not
interchangeable with other engines.

There are really only two sizes of piston for 2.7, and ditto 3.0L. The other
classes are only 0.39 thou from nominal.
These are standard, & 8 thou oversize. Piston pins are 2 classes but differ by
only 0.01 thou.
Two piston weights 2.7L 411gm, 3.0L 470gm. Both +/-3gm.

Strengthened blocks were introduced from 301.881; 350.159; 400.551; 450.590
Some very late 2.7L carbs additionally. The crank is modified to suit.

Modified 3.0L pistons from 350.151; 400.339; 450.405. Final 'B' rods fitted
from 302.945; 350.177 * *

Mandatory on repair / late oil pump relief valve from 302.029; 350.171; 400.631;
450.639

Mk 2 water pump seal from 303.344; * 400.649; 450.664


* = missing data : supply if you can.
  • From David Hume
according to my records the SM 3.0 engines used in the 
Merak in the US market ended in the C114.51.30 600.000 range with some 
late updates but no domed pistons and big valves.The 610.000 C114.55.30 
was the start of the SS engines here.Europe could have had something 
different.I have seen Ligier Engines numbered C114.01.03 that had big 
valves , domed pistons and regular cam covers,not in the US but in 
France.
  • More from Andrew
114.53.30 520.023
And it's an SS.

See also