Hi, first you must loosen the nuts that secure the bar. Then, you must find the tensioner screw which should be located on the opposite side of the bar. Use the appropriate screw driver to increase the tension on the chain. If you pull on the chain and it lifts about a quarter inch off the bar, then chain has the right tension. Re tighten the nuts that secure the bar. Good luck.
http://technoanswers.blogspot.com/2011/12/how-to-remove-timing-chain-cover-and.html
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& Front Cover on Ford Expedition and Lincoln Navigator?
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---------These details will help.For more help keep updated.Thanks.
Examine the chain saw to verify that the chain is still attached to the sprocket. If any part of the chain is not on the sprocket the chainsaw will not cut correctly.
Check the tension of the chain. If the lower part of the chain drops away from the guide bar, you will need to increase the tension. Remove the shield on the side case and loosen the nuts on the guide bar with the wrench. Pull the guide bar to increase tension on the chain and then tighten the nuts.
Clean the chain if it appears dirty. A dirty chain will not cut as efficiently as a clean chain. Loosen the tension on the chain and then take the chain off of the guide bar. Soak the chain in a solvent, such as mineral spirits.
Examine the sprocket on the chain saw. If it appears worn, bent or out of pitch, a new sprocket will be needed.
Examine the chain to see if there are any damaged drive links. Replace the chain if too many of the drive links are damaged because the sprocket will not turn the chain.
Examine the guide bar to see if it appears crooked or is out of alignment. Remove the nuts from the guide bar by following Step 2. Take off the old guide bar and then install a new one.
Sharpen the chain if it looks shiny. The shine on the chain indicates that the steel that is underneath the chrome plating on the chain has worn away. Use a round metal file on the steel until there is a thin overhang of chrome over the cutting edge of the chain. This will restore the cutting edge
Read more: How to Troubleshoot a Chainsaw Chain ' eHow.com http://www.ehow.com/how_6317552_troubleshoot-chainsaw-chain.html#ixzz1fLUkDPOc
hope it helps
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