I suspect that the time you invest in writing any papers now will be mostly paid back because it will make it much easier to write your dissertation.
I published several papers during my PhD research, and am currently writing my dissertation. My first step was to copy the introduction from each paper into my literature review chapter, and put the body of each paper into a separate chapter of my thesis. Of course, I have to write segues and reorganise the information a bit, but that gave me a big head start on the dissertation. Of course, you'll need to check that the copyright agreement you sign with the publisher allows you to include content from your paper in your PhD dissertation (most do), and also verify that your institution allows this as well.
Another tip: If you write a paper, hang onto any material that you cut out to meet space requirements. You may want to include that material in your thesis.