You can find Factory Service Manuals in PDF format for the following:
'89-'90 USDM Nissan 240SX
'91-'94 USDM Nissan 240SX
'95 USDM Nissan 240SX
'96 USDM Nissan 240SX
'97 USDM Nissan 240SX
'98 USDM Nissan 240SX
Nissan R32 GTR
Nissan S13 CA18DET
Nissan S14 SR20DET
Nissan S15 SR20DET
http://www.westtexasimports.net/NissanManuals/



