7 Engine parts are listed for the 1957 Triumph TR3A, in 3 part types, covering the 2.0L L4 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1957 Triumph TR3A, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. All 7 listed parts are Crankshaft Repair Sleeve (3 parts), Crankshaft Seal (3 parts) and Oil Filter (1 part).
Every part on this page is matched to the 2.0L L4 — the only engine offered in the 1957 Triumph TR3A.
The most listed brands for 1957 Triumph TR3A engine parts are NATIONAL (2 parts), SCHAEFFLER (2 parts) and WJB / INMOTION PARTS (2 parts), plus 1 more brand.
Each part number listed for the 1957 Triumph TR3A opens a page with every vehicle that part fits.
Crankshaft Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 99174 | 🇺🇸 US | Front | View on Amazon |
| SCHAEFFLER | SR3496 | 🇺🇸 US | Frontwith 1.750 In Shaft | View on Amazon |
| WJB / INMOTION PARTS | WS99174 | 🇺🇸 US | Front | View on Amazon |
This table covers the sleeves used to restore a grooved crankshaft seal surface.
3 Crankshaft Repair Sleeve parts are listed for the 1957 Triumph TR3A, from NATIONAL, SCHAEFFLER and WJB / INMOTION PARTS.
This group includes NATIONAL 99174, SCHAEFFLER SR3496 and WJB / INMOTION PARTS WS99174.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 450494 | 🇺🇸 US | Front | View on Amazon |
| SCHAEFFLER | SS2791 | 🇺🇸 US | Front28.575 mm Inside Diameter | View on Amazon |
| WJB / INMOTION PARTS | WS450494 | 🇺🇸 US | Front | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
3 Crankshaft Seal parts are listed for the 1957 Triumph TR3A, from NATIONAL, SCHAEFFLER and WJB / INMOTION PARTS.
Listed part numbers: NATIONAL 450494, SCHAEFFLER SS2791 and WJB / INMOTION PARTS WS450494.
Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX | 51302 | 🇺🇸 US | View on Amazon |
This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive.
One part is listed for the 1957 Triumph TR3A — WIX 51302.
Buying Engine Parts for a 1957 Triumph TR3A
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Confirm you have the 2.0L L4 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Crankshaft Repair Sleeve and Crankshaft Seal .
Frequently Asked Questions
How many engine parts fit the 1957 Triumph TR3A?
Our catalog currently lists 7 engine parts for the 1957 Triumph TR3A across 3 subcategories and 4 brands, covering the 2.0L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of engine problems on a 1957 Triumph TR3A?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1957 Triumph TR3A was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1957 Triumph TR3A?
Every part on this page is matched to the 2.0L L4 engine. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1957 Triumph TR3A
Engine Parts for Other Triumph TR3A Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.