What causes svn error 413 Request Entity Too Large?
Try to add the following configuration directives to your Apache configuration file:
LimitXMLRequestBody 8000000
LimitRequestBody 0
I don't have access to my repo server (IT Managed, and its over the weekend). So what I found was that I could work around this issue by doing an svn update on subdirs until one wouldn't work. Then I descended into this dir until I stopped getting the 413 error. Then I could do an update at higher levels. Might not work for everyone but could help get through in an emergency