英語版だが、無料で928のサービスマニュアル(ワークショップマニュアル)をダウンロードできる。
ダウンロードに少し時間が掛かる。
本来のホームページは消失しているが、Internet Archive Wayback Machine(https://archive.org/web/)を使用してダウンロードするので上手くダウンロードできないこともあるし、これもいつ消失するかわからないので早めにダウンロードすることをお勧めする。
928 Workshop Manual の Volume 2から5はすでに消失してしまっている。
Porsche 928
928 Workshop Manual - 1978 Current Flow Diagram 2,141 1978 Current Flow Diagram.pdf 35ページ
https://web.archive.org/web/20091014112945/http://www.cannell.co.uk:80/928_Workshop_Manuals/1978%20Current%20Flow%20Diagram.pdf
928 Workshop Manual - 1979 Current Flow Diagram 1,723 1979 Current Flow Diagram.pdf 23ページ
https://web.archive.org/web/20091014112949/http://www.cannell.co.uk:80/928_Workshop_Manuals/1979%20Current%20Flow%20Diagram.pdf
928 Workshop Manual - 1980 Current Flow Diagram 2,327 1980 Current Flow Diagram.pdf 31ページ
https://web.archive.org/web/20091014115519/http://www.cannell.co.uk:80/928_Workshop_Manuals/1980%20Current%20Flow%20Diagram.pdf
928 Workshop Manual - 1981 Current Flow Diagram 2,302 1981 Current Flow Diagram.pdf 31ページ
https://web.archive.org/web/20091014174939/http://www.cannell.co.uk:80/928_Workshop_Manuals/1981%20Current%20Flow%20Diagram.pdf
928 Workshop Manual - 1982 Current Flow Diagram 2,391 1982 Current Flow diagram.pdf 32ページ
https://web.archive.org/web/20091014174723/http://www.cannell.co.uk:80/928_Workshop_Manuals/1982%20Current%20Flow%20diagram.pdf
928 Workshop Manual - 1983 Current Flow Diagram 2,339 1983 Current Flow Diagram.pdf 31ページ
https://web.archive.org/web/20091014174944/http://www.cannell.co.uk:80/928_Workshop_Manuals/1983%20Current%20Flow%20Diagram.pdf
928 Workshop Manual - 1984 Wiring Diagram 1,734 1984 Wire Diagram.pdf 24ページ
https://web.archive.org/web/20091014174948/http://www.cannell.co.uk:80/928_Workshop_Manuals/1984%20Wire%20Diagram.pdf
928 Workshop Manual - 1985 Wiring Diagram 1,672 1985 Wire Diagram.pdf 18ページ
https://web.archive.org/web/20091014174953/http://www.cannell.co.uk:80/928_Workshop_Manuals/1985%20Wire%20Diagram.pdf
928 Workshop Manual - 1986 Wiring Diagram 2,085 1986 Wire Diagram.pdf 20ページ
https://web.archive.org/web/20110911075647/http://www.cannell.co.uk:80/928_Workshop_Manuals/1986%20Wire%20Diagram.pdf
928 Workshop Manual - 1987 Wiring Diagram 3,592 1987 Wire Diagram.pdf 35ページ
https://web.archive.org/web/20091014112956/http://www.cannell.co.uk:80/928_Workshop_Manuals/1987%20Wire%20Diagram.pdf
928 Workshop Manual - 1988 Wiring Diagram 3,670 1988 Wire Diagram.pdf 38ページ
https://web.archive.org/web/20091014113002/http://www.cannell.co.uk:80/928_Workshop_Manuals/1988%20Wire%20Diagram.pdf
928 Workshop Manual - 1989 Wiring Diagram 4,303 1989 Wire Diagram.pdf 39ページ
https://web.archive.org/web/20100325195400/http://www.cannell.co.uk:80/928_Workshop_Manuals/1989%20Wire%20Diagram.pdf
928 Workshop Manual - 1991 Wiring Diagram 3,920 1991 Wire Diagram.pdf 30ページ
https://web.archive.org/web/20110905023911/http://www.cannell.co.uk/928_Workshop_Manuals/1991%20Wire%20Diagram.pdf
928 Workshop Manual - 1993-1 Wiring Diagram 4,032 1993-1 Wire Diagram.pdf 30ページ
https://web.archive.org/web/20091014113047/http://www.cannell.co.uk:80/928_Workshop_Manuals/1993-1%20Wire%20Diagram.pdf
928 Workshop Manual - 1983-2 Wiring Diagram 4,323 1993-2 Wire Diagram.pdf 31ページ
https://web.archive.org/web/20091014113052/http://www.cannell.co.uk:80/928_Workshop_Manuals/1993-2%20Wire%20Diagram.pdf
928 Workshop Manual - 1994 Wiring Diagram 4,338 1994 Wire Diagram.pdf 35ページ
https://web.archive.org/web/20091014174732/http://www.cannell.co.uk:80/928_Workshop_Manuals/1994%20Wire%20Diagram.pdf
928 Workshop Manual - USA symbols and explanations 133 928 USA Symbols and Explanation.pdf 2ページ
https://web.archive.org/web/20091014115526/http://www.cannell.co.uk:80/928_Workshop_Manuals/928%20USA%20Symbols%20and%20Explanation.pdf
928 Workshop Manual - Volume 1a 40,022 Manual Volume_1A.pdf 307ページ
https://web.archive.org/web/20110910023313/http://cannell.co.uk/928_Workshop_Manuals/Manual%20Volume_1A.pdf
928 Workshop Manual - Volume 6 1,236 Manual Volume_6.pdf 30ページ
https://web.archive.org/web/20090824051657/http://www.cannell.co.uk:80/928_Workshop_Manuals/Manual%20Volume_6.pdf
928 Workshop Manual - Volume 7 75 Manual Volume_7.pdf 4ページ
https://web.archive.org/web/20081011092025/http://www.cannell.co.uk/928_Workshop_Manuals/Manual%20Volume_7.pdf
928 Workshop Manual - Table of Contents with links 1,232 Table of Contents w Links.pdf 26ページ
https://web.archive.org/web/20091014115711/http://www.cannell.co.uk:80/928_Workshop_Manuals/Table%20of%20Contents%20w%20Links.pdf