Serkan
Hi - I have a Generac 6249 17kW.  I will do a valve lash adjustment.  I wanted to see if you have a view on what kind of a crowfoot wrench and torque wrench I should use.  I have read posts saying the spacing is too tight.  Any recommendations would be very much appreciated as I want to do it right.  Thank you.
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78buckshot
The only thing I have ever used is a combination (open/box) wrench, I use a 13mm or 1/2in. whichever fits the best on the particular engine. You will also need a 10mm hex key (Allen wrench). Just pay attention to how tight the lock-nut was as you are loosening it, not a lot of rocket science here. I don't know how many hundreds of valve adjustments I have done on these but have not had any issues or return visits due to valve lash, and I check and adjust them on every annual visit so I'm returning to my own work year after year and know that it's been good to go.
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78buckshot
Hi Serkan, for the benefit of all forum members I will give a little more info. To find Top Dead Center of the piston/cylinder your working on use a drinking straw or pencil but don't loose the eraser down the hole. See the post in "Helpfull Posts"on how to adjust valve lash.
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Ron Goldstein Rongold
Use a 1/2" or 13mm open end crowfoot wrench (whichever is snuggest) on an extension. Don't try to loosen or tighten the nut from the outside---Position the crowfoot between the rocker arms and loosen & tighten it like that. The valve cover gasket rail on the head is raised, and if you try to grab the nut from the outside, the crowfoot will be at an upward angle and most likely slip off of the nut. If using a torque wrench, keep the handle of the torque wrench at 90 degrees to the crowfoot opening to get accurate tightening torque.
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Serkan
Thank you Ron and 78buckshot for your helpful points.  78buckshot, the manual says to turn the engine clockwise, but your note in the "helpful posts" section says to move the fan in the counterclockwise section.  The discrepancy might be due to where direction one is facing.  Would you please clarify this confusion for me?  I am sorry for asking a simple question, but I am struggling with finding a careful and detail-oriented technician do this for me.  Thanks a lot in advance.
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Ron Goldstein Rongold
Hi Serkan,

     It doesn't matter how long an extension is, as long as it is vertical. Here is a page from the Ford Service Manual giving formulas for various torque wrench setups. The one that pertains to what we use for torqueing the rocker arm nuts is the top right one or the third one down on the right side. As long as the socket is at 90 degrees to the torque wrench handle, no formulas are necessary. If your tool adds length as in the third one down on the left, then you have to figure out your conversion formula.


TorqueWrenchFormulas.jpg
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78buckshot
Turning the engine with the spark plugs out is pretty easy, from the generator end cooling fan you will be turning it counter-clockwise, if viewed from the front of the engine which is at the right end of the machine it would be clockwise but there is no good way to turn it from that end.
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