Selected answers from the Dumb SEO Questions Facebook & G+ community.
Alan Bleiweiss: If your site is already indexed, Google is crawling it on a regular basis already. If it`s not a big site, the recrawl process "shouldn`t" take long on its own. If you want, you can resubmit your sitemap XML file, if that file shows the date files were last modified. It`s not a guaranteed way to speed up the process, however it doesn`t hurt to do that.
Sujit Das: Should I delete the exist sitemap and submit it again?
Glenn Cooper: I`m pretty sure in your webmaster console it tells you how often the site is crawled. Don`t worry about it, google will recrawl and reindex within days.
EDIT: I`ve seen one page recrawled and reindexed in the same day
Gregor Grigorian: Resubmit the sitemap and Google will crawl in the next few days. If you have Yoast then they automatically ping search engines.
Jody Nesbitt: login to Google Search Console, on the left, Crawl, then "fetch as google", fetch the site, then submit it
Roma Alloui: you shouldn`t need to delete the existing xml sitemap (again, I am talking about the xml and not the html sitemap). I recommend going to your domain.com/sitemap.xml just to take a look at it and make sure that everything is fine. Then you just need to log into your Console and click on the `Resubmit` option. Note that there is no set time of when Google bot will re-crawl your site again. I`ve seen the changes implemented in hours, a day or so, and weeks. Unfortunately, there is nothing you can do to speed up the re-crawl process but what you can do is focus on something else that your site might need and be patient!
I have updated content on all pages. What is the best way to crawl whole website again by Google? 
