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Adjusting Valves on Generac Generator
Posted on 9/20/23 at 4:15 pm
Posted on 9/20/23 at 4:15 pm
Moved into a home with a home generator. Changed the oil, oil filter, air filter and added a new battery. In the manual it says to have the valves adjusted after 25 hours of use. The generator has 60 something hours on it and I don't know if the valves have been adjusted or not. Not sure if this is something I can do myself and I don't know if the previous owner had it done. How important is it to have it done?
2
Posted on 9/20/23 at 4:46 pm to Yammie250F
Setting the valve lash is pretty important. It's simple to do. Get a feeler gauge, remove the valve covers, and make sure the lash is meeting the specs as outlined in the manual for that engine. It should have separate intake valve and exhaust valve specs. There may be two or three different specs, or there may not be. I remember my mud boat engine had three different lash specs to achieve different running conditions.
ETA: The "lash" is the amount of space between the rocker and the valve stem head. To check the lash, select the feeler according to the spec and stick it between the rocker and the valve head. Put a little dab of oil on both sides of the feeler. It should be contacting both sides but shouldn't be tight. The feeler should be able to slide easily between them. There's some pretty good youtube videos on it.
ETA: The "lash" is the amount of space between the rocker and the valve stem head. To check the lash, select the feeler according to the spec and stick it between the rocker and the valve head. Put a little dab of oil on both sides of the feeler. It should be contacting both sides but shouldn't be tight. The feeler should be able to slide easily between them. There's some pretty good youtube videos on it.
This post was edited on 9/20/23 at 4:56 pm
Posted on 9/20/23 at 4:58 pm to TheBoo
Makes you feel like a real mechanic too. It's easy
Posted on 9/20/23 at 6:59 pm to TheBoo
I'm confident I can measure them with a feeler gauge it just the actual adjustment that would need to be done if it is out of spec. YouTube videos I've watched don't necessarily break it down simple stupid style like I would need.
Posted on 9/21/23 at 6:17 am to Yammie250F
The way I was taught is you put an extra 0.003" feeler plus what you want, pinch the rocker down on that and torque it down and it'll be right.
Posted on 9/21/23 at 8:48 am to Yammie250F
This the quote from Generac's website on valve adjustment:
Do you have the owners manual? Can you download one from Generac?
I don't know a lot about Generac engines but I assume they use different engines and this different valve adjusting procedures as well as spec's.
I would not slip this. If you are not sure call a Generac dealer and get an estimate.
quote:
Valve clearance adjustment is critical to proper engine operation and requires special tools and training. Instructions are covered in the Valve Clearance Adjustment section of your owner's manual. However, if you are no comfortable preforming this service procedure, have your dealer maintain the generator's valve clearance at the intervals specified.
Do you have the owners manual? Can you download one from Generac?
I don't know a lot about Generac engines but I assume they use different engines and this different valve adjusting procedures as well as spec's.
I would not slip this. If you are not sure call a Generac dealer and get an estimate.
Posted on 9/21/23 at 2:11 pm to Yammie250F
This video is pretty clear. Hope this helps.
Posted on 9/21/23 at 9:27 pm to Yammie250F
I doubt the previous owner had this done. It is pretty easy once you know what you are doing. However, I can’t say that someone with no engine experience should be messing with that given the critical nature of a standby generator. I would probably have someone do it for you.
Posted on 9/22/23 at 11:36 am to Spankum
quote:
I doubt the previous owner had this done. It is pretty easy once you know what you are doing. However, I can’t say that someone with no engine experience should be messing with that given the critical nature of a standby generator. I would probably have someone do it for you
Meh, maybe so, but this really is a rudimentary task. If you can change the oil and the spark plug you can set your valve lash.
Posted on 9/22/23 at 5:57 pm to TheBoo
From watching that video I'm pretty sure I can do it. I've changed top ends on 2 strokes so I'm somewhat familiar.
Thanks for the responses.
Thanks for the responses.
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