you have sohc timing chain rattle. it's not a matter of removing the timing chain guide. that's a dohc fix.
http://www.240sx.org/faq/articles/ti..._questions.htm
here's a link to a good faq. it has a list of all the parts you need to fix sohc rattle.
you want to fix it yourself? here's what you need to do:
1. download a factory service manual (search for the link on zilvia), study the timing chain overhaul.
2. buy the parts and tools
3. spend a weekend or two doing the timing chain removal & install.
please note the link has info on both DOHC and SOHC rattle; naturally easy dohc fixes dont pertain to your situation.