Volvo Penta U21: manual and spare parts

Troubleshooting

Official
Volvo Penta – Manuals & handbooks (external link)
Official instruction manual search by engine serial number.
Official
Volvo Penta – publications archive (pubs.volvopenta.com) (external link)
Example: D1/D2 owner's manual as a PDF directly from Volvo Penta.
PDF
Official
Volvo Penta Publications (pubs.volvopenta.com) (external link)
Volvo Penta's publication database with free owner's manuals as PDFs.
Official
Volvo Penta: Aquamatic sterndrive gas (external link)
Current petrol engines and drives.
Archives
Marine Diesel Engine Manuals – Volvo Penta (external link)
Preview of owner's manuals and workshop manuals by model; full version for a voluntary contribution.
Archives
Boat-manuals.com – Volvo Penta (external link)
Free PDFs, mainly workshop manuals.
Club
The Volvo Penta marine engine site: Handbooks (external link)
Enthusiast site with manuals. The original files are gone but survive as copies in the Wayback Machine (linked per model).

Shop
Marine Parts Express – exploded views, Volvo Penta diesel (legacy.marinepartsexpress.com)
Spare parts diagrams by engine model, free to browse.
Shop
Marine-diesel-engine-manuals.com: Volvo Penta (external link)
Workshop and instruction manuals for AQ, GL/GXi and drives. Some pages can be previewed for free; the full manual must be purchased.

Search used:

Outboard

2 cyl · Petrol

Inboard

Inboard

Inboard

Petrol

Where can I find the owner's manual for U21?

Links to owner's manuals and workshop manuals are available under Manuals.

How many cylinders does U21 have?

Volvo Penta U21 has 2 cylinders.