| Also known as | E7998 |
| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 16 |
| Subsystem | engine bottom |
| Listed in parts books | 1968, 1970 |
PISTON COMPLETE
A complete piston assembly (rings and pin included) for the cylinder/crankshaft area of the engine, cataloged 1968-1970.
70-7998 is a complete piston as listed in the parts books, meaning it's supplied assembled with rings and gudgeon pin ready to go into the barrel rather than sold as a bare forging. It shows up in the catalog under the CYLINDER AND CRANKSHAFT and CYLINDER HEAD, BARREL AND CRANKSHAFT figures, which tells you it's a bottom-end engine component tied directly to the barrel it runs in.
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The catalog carries this number across appearances from 1968 through 1970, and it also appears under the older E7998 form, which is the letter-prefix style used before Triumph moved to the numeric part numbering. If you're cross-checking an older parts book against a newer one, E7998 and 70-7998 are the same physical piston.
We don't have bore size, compression ratio, or oversize information on file for this listing, so before ordering, measure your barrel and confirm against your engine's spec rather than going by year alone. Give the shop a call if you want help sorting out which piston size you need.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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