The 1973 Lotus Seven has 9 engine parts with verified fitment on this page — 2 part types and 4 brands, covering the 1.6L L4 engine. Each part includes a manufacturer part number and application notes.
The engine on the 1973 Lotus Seven covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. All 9 listed parts are Crankshaft Seal (5 parts) and Crankshaft Repair Sleeve (4 parts).
The 1973 Lotus Seven came with a single engine, the 1.6L L4, and every part is verified against it.
4 brands supply engine parts for the 1973 Lotus Seven, led by NATIONAL (3 parts), SCHAEFFLER (3 parts) and WJB / INMOTION PARTS (2 parts), plus 1 more brand.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1973 Lotus Seven. 1 part has it: WJB / INMOTION PARTS WS3393 (Crankshaft Seal). Each part number opens a page with every vehicle that part fits.
Crankshaft Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 99237 | 🇺🇸 US | Rear | View on Amazon |
| SCHAEFFLER | SR3521 | 🇺🇸 US | Rear3.486 In Outside Diameter | View on Amazon |
| SCHAEFFLER | SS3474 | 🇺🇸 US | Front | View on Amazon |
| WJB / INMOTION PARTS | WS99237 | 🇺🇸 US | Rear | View on Amazon |
This table covers the sleeves used to restore a grooved crankshaft seal surface.
4 Crankshaft Repair Sleeve parts for the 1973 Lotus Seven come from 3 brands — SCHAEFFLER, NATIONAL and WJB / INMOTION PARTS.
This group includes NATIONAL 99237, SCHAEFFLER SR3521 and SCHAEFFLER SS3474 and the remaining parts above.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WS3393 | 🇺🇸 US | RearViton Type | View on Amazon |
| BCA | NS3393 | 🇺🇸 US | RearViton Type | View on Amazon |
| NATIONAL | 3393 | 🇺🇸 US | RearViton Type | View on Amazon |
| NATIONAL | 3394 | 🇺🇸 US | Front | View on Amazon |
| SCHAEFFLER | SS3211 | 🇺🇸 US | Rear10.16 mm Width | 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.
5 Crankshaft Seal parts for the 1973 Lotus Seven come from 4 brands — NATIONAL, WJB / INMOTION PARTS, BCA and 1 other brand. The "Popular" part is WJB / INMOTION PARTS WS3393.
This group includes WJB / INMOTION PARTS WS3393, BCA NS3393 and NATIONAL 3393 and the remaining parts above.
Buying Engine Parts for a 1973 Lotus Seven
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 1.6L 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 Seal and Crankshaft Repair Sleeve .
Frequently Asked Questions
How many engine parts fit the 1973 Lotus Seven?
Our catalog currently lists 9 engine parts for the 1973 Lotus Seven across 2 subcategories and 4 brands, covering the 1.6L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of engine problems on a 1973 Lotus Seven?
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 1973 Lotus Seven 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 1973 Lotus Seven?
Every part on this page is matched to the 1.6L 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 1973 Lotus Seven
Engine Parts for Other Lotus Seven Years
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