Triumph engine bearing information and numbers for engines that are 550cc and over, including small end, cage info, main bearings, big end part number and connecting rod cast number where available.
While this list is not extensive, it covers a variety of Triumph vintage, classic and veteran motorcycles.
Years covered from 1929 through to the plain bearing Triples from 1969 on.
Models included on this page are: Triumph NSD, ND, 5-1, 5-3, 6s, 6T Thunderbird, T110, TR6, T120, T150.
550cc Triumph Side Valve models, 1929-36, Engine bearing part numbers
| Year(s) | Model | Conrod cast # | Big end Pt # | Cage Pt # | Small end Pt # | Drive side Main bearing | Timing side Main bearing |
|---|---|---|---|---|---|---|---|
| 1929-33 | NS, NSD | TE6 | T5 | – | SE94 | ? | ? |
| 1934-35 | 5-1, 5-3 | E441 | T4 | – | SE90 | ? | ? |
| 1936 | 5-1, 5-3 | E518 | T4 | – | SE90 | ? | ? |
600cc Triumph 6S, 1937-40, Engine bearing part numbers
| Year(s) | Model | Conrod cast # | Big end Pt # | Cage Pt # | Small end Pt # | Drive side Main bearing | Timing side Main bearing |
|---|---|---|---|---|---|---|---|
| 1937-40 | 6S | E1299 | T4 | – | SE91 | MS11 7 LS10 | LS10 |
650cc & 750cc Triumph Twins, 1950-1970, Engine bearing part numbers
Plain bearing engines. Pre-unit and unit construction: 6T Thunderbird, T110, TR6, T120,
| Year(s) | Model | Big end Shell No. | Big end journal Std size & tolerance |
Small end Pt # | Drive side Main bearing | Timing side Main bearing |
|---|---|---|---|---|---|---|
| 1950-53 | 6T, Thunderbird | B2026M (70-3586) | 1.4370 to 1.4375 | SE106 | MS11 | RM10LL |
| 1954-65 | 6T, T110, TR6, T120 | B2026M (70-3586) | 1.4370 to 1.4375 | SE106 | MS11 | MS11 |
| 1966 | 6T, TR6, T120 | B2026M (70-3586) | 1.4370 to 1.4375 | SE106 | RM11L | MS11 |
| 1967-70 | TR6, T120 | B2026M (70-3586) | 1.4370 to 1.4375 | SE106 | RM11L | MS11 |
750cc Triumph Triple T150, 1968 on, Engine bearing part numbers
Plain bearing engines.
| Year(s) | Model | Big end Shell No. | Big end journal Std size & tolerance |
Small end Pt # | Centre bearing Pt # | Centre bearing size | Drive side Main bearing | Timing side Main bearing |
|---|---|---|---|---|---|---|---|---|
| 1969 on | T150 | B3053LC (70-5998) | 1.6235 1.624 | M2098LC (70-6023) | 1.917 1.9175 |
The information provided on this page is a guide. It is the same information provided by a UK bearing company. If there are gaps in the data, it’s because the information isn’t available, or the part doesn’t exist.
