Triumph engine numbers are stamped into the case just below the cylinder on the primary side. Frame numbers are stamped into the frame on the headstock also on the same side. Crooked stampings and unequal depth are common. Frame numbers match the engine number after 1950, but may not have the model designation, only the numbers.
Year and model shown as prefix to engine number. For example 8-T-33445 is a 1938 Speed Twin (later identified as “5T” instead of just “T”). Frame prefixes were-”TH” for early Speed Twin. “TF” for the T-100 and later 39/40 Speed Twin.
Year shown in engine number prefix with two figures. For example 40-5T-26445 is a 1940 Speed Twin. This practice followed religiously and some single prefixes may appear on postwar models. Frame prefixes were ‘TL” for the 3T up to 1948 and TC for 1949. TR5 for 1949 was followed by a ‘T” after the actual number. All other frames were TF. TR5 models did not have separate number series but ran concurrently with all other models. I.E. 112671 was last ’49 TR5 and I1 3386 the last ’49 5T.
Note: All Grand Prix T100′s have letter ”R” suffix following engine and frame numbers. TR5 models had separate number series; engines from 101001 to 106424, frames from TC11001-T to TC13107-T. Starting in 1950 frame and engine numbers were matching.
|YEAR||ENGINE NUMBERS||FRAME NUMBERS|
|1946||FROM 72000||PREFIXED AS BEFORE|
|1947||FROM 79046||PREFIXED AS BEFORE|
|1948||88864 – 102235||TF 15001 – TF25000|
|1949||102236 – 113386||TF25001 – TF33615|
|YEAR||Unit 350/500||Pre Unit 500/650|
|1951||*||101NA TO 15808NA|
|1952||*||15809NA TO 25000NA|
|THEN 25000 TO 32302|
|1953||*||32303 TO 44134|
|1954||*||44135 TO 56699|
|1955||*||56700 TO 70929|
|1956||*||70930 TO 82799|
|THEN 0100 TO 0944|
|1957||H101 – H760||0945 TO 011115|
|1958||H761 – H5484||011116 TO 020075|
|1959||H5485 – H11511||020076 TO 029363|
|1960||H11512 – H18611||029364 TO 030424|
|THEN D101 TO D7726|
|1961||H18612 – H25251||D7727 TO D15788|
|1962||H25252 – H27932||D15789 ON|
|YEAR||Unit 350/500||Unit 650|
|1963||H29733 – H32464||DU101 TO DU5824|
|1964||H32465 – H35986||DU5825 TO DU13374|
|1965||H35987 – H40527||DU13375 TO DU24874|
|1966||H40528 – H49832||DU24875 TO DU44393|
|1967||H49833 – H57082||DU44394 TO DU66245|
|1968||H57083 – H65572||DU66246 TO DU85903|
|1969||H65573 – H67331||DU85904 TO DU90282|
IN 1969 TRIUMPH INTRODUCED A NEW SYSTEM OF NUMBERING ENGINES AND FRAMES. THERE ARE TWO LETTERS, A FIVE DIGIT NUMBER, AND A MODEL DESIGNATION. THE FIRST LETTER REPRESENTS THE MONTH, THE SECOND THE MODEL YEAR, AND THE NUMBER WHICH BEGAN AT 00100 FOR EACH MODEL YEAR.
EACH MODEL YEAR STARTED IN AUGUST AND RAN UNTIL JULY OF THE NEXT YEAR. IF YOUR BIKE WAS MADE FROM AUGUST TO DECEMBER, IT IS A NEXT YEAR MODEL. FOR EXAMPLE: PD32232 TR6R WOULD BE A 1971 TR6R MANUFACTURED IN NOVEMBER OF 1970, AND KC16670 T120R WOULD BE A 1970 T120R MANUFACTURED IN SEPTEMBER OF 1969. THE LETTER “V” AFTER THE MODEL DESIGNATES A 5 SPEED GEARBOX.
|Month of Manufacture||Year of Manufacture|
|a - January||c - 1969|
|b - February||d - 1970|
|c - March||e - 1971|
|d - April||g - 1972|
|e - May||h - 1973|
|g - June||j - 1974|
|h - July||k - 1975|
|j - August||n - 1976|
|k - September||p - 1977|
|n - October||x - 1978|
|p - November||a - 1979|
|x - December||b - 1980|
KNOWING THE YEAR OF YOUR ENGINE IS IMPORTANT WHEN ORDERING PARTS. IF YOUR ENGINE WAS MADE IN 1971 BUT IS A 1972 MODEL YEAR YOU MAY GET THE WRONG PARTS IF YOU ARE USING THE 1971 PARTS CATALOG. Please be sure of your engine year to insure correct orders.