Warbird News posted this on FB, and I checked it out and found that it's an excellent source for aircraft and engine manuals and it's cheap too!
http://www.avialogs.com/It's non-profit and run by a Canadian named Benoit de Mulder who so far, appears to be a good guy. You can view all you want for free, but if you want to download anything it's a $14.00 membership for 6 months. Paypal had a glitch and I accidentally paid twice and he emailed me within minutes to let me know of the mistake and asked if I wanted the $14 bucks back or to just extend my membership. Nice to see honesty online these days.
The manuals aren't always the newest revisions, but in many cases it's all there is or at least something is better than nothing. You also have the option of adding to the library if you have some manuals electronically that you wish to add. Uploading is easy. I have already added some of the CT-133 (Canadair T-33) manuals that I have and will probably be adding more as I have time.
As an aircraft mechanic, former aircraft maintenance instructor and current tech rep, one of my big pet peeves is people not reading the manual. Tribal knowledge only goes so far in keeping an airplane safe and it goes absolutely no where if you're having to defend yourself in court after an airplane you worked on crashed.
I've managed to collect several sets of aircraft manuals electronically because I'm always searching for the most current revision I can for the warbirds that I work on. I'm always willing to share them with anyone who needs them for working on or flying a warbird, and this is a great way for me to do it.