Yardvacuum Impeller Removal

[l008com]

Hmm maybe I'll go pick up an M11-1.25 then and see if that fits any better.

 

[Tiger Small Engine]

So I watched a bunch of youtube videos for removing the impeller off my machine. This is so I can ultimately take the motor off and open it up because I think it overheated and melted it's camshaft. But anyway....

Multiple videos say to use a 7/16" - 20 bolt. So I go pick one up and when I go to thread it in, nada. Totally the wrong threading, although the diameter seems right.

So what's going on here? Did I buy a bolt with the wrong threading? Certainly possible someone could have put it in the wrong spot on the nut and bolt wall at the hardware store. Easy enough to check if someone can tell me what the " - 20" is. Is that like threads per inch or theads per something?

OR does my impeller just need something other than - 20 threading? Unfortunately you need this bolt to remove the impeller so I can't just bring it into the hardware store and try every size until I find one that works - which is what I normally do in a situation like this

BUT I do have a picture, maybe you guys can tell just by looking?
View attachment 70231

Assuming the "20" is the threads-per-inch, it looks like I have 19 threads per inch here. I assume that missing thread is just the perspective of the camera. So it is a -20 bolt, so I guess I need something else you think?
View attachment 70232

Oh also here's the model number(s) off the machine itself:
24A-070J799
247.77013.0

And the serial number is:
1H198G70100

If you can get the engine opened up, can you show us pictures of what a “melted camshaft “ looks like please? Lobes can be compromised, but never heard of a small engine turning 3600 RPMs, melting a cam.

 

[l008com]

The whole project will be a youtube video some day. I don't have any idea what the camshaft is going to look like, but what I do know is:
The camshaft is plastic
The engine was running well when I first started it up.
It died and had zero compression when I tried to restart it.
The compression came back but with the valve cover off, the valves were opening and closing at the complete wrong times.

Also I didn't know when I started it up but it had a lot of leaves and similar yard waste packed up under the cover.

So the only thing that makes sense to me is that the came shaft melted to some degree. I'l find out eventually.

 

[l008com]

My local hardware store has two big isles of all nuts and bolts. But alas, they only had even numbered mm bolts, no 11mm at all. I grabbed a 10mm just to see but it fit right through the hole without engaging the threads at all.

 

[StarTech]

I tried to tell you that it is a non standard size. About the only fairly local place that might have an used one is the Toyota Dealer repair shop since it is used as a head bolt.

Now you know why they said to drill for a 7/16-20 tap and tap it for the 7/16-20 bolt.

OR you just buy a set of 8 for around $50+ from the auto part store.

 

[l008com]

Hmm I guess I'll have to consider re-tapping the whole, that might be the easiest solution.

 

[Laabk2]

So I watched a bunch of youtube videos for removing the impeller off my machine. This is so I can ultimately take the motor off and open it up because I think it overheated and melted it's camshaft. But anyway....

Multiple videos say to use a 7/16" - 20 bolt. So I go pick one up and when I go to thread it in, nada. Totally the wrong threading, although the diameter seems right.

So what's going on here? Did I buy a bolt with the wrong threading? Certainly possible someone could have put it in the wrong spot on the nut and bolt wall at the hardware store. Easy enough to check if someone can tell me what the " - 20" is. Is that like threads per inch or theads per something?

OR does my impeller just need something other than - 20 threading? Unfortunately you need this bolt to remove the impeller so I can't just bring it into the hardware store and try every size until I find one that works - which is what I normally do in a situation like this

BUT I do have a picture, maybe you guys can tell just by looking?
View attachment 70231

Assuming the "20" is the threads-per-inch, it looks like I have 19 threads per inch here. I assume that missing thread is just the perspective of the camera. So it is a -20 bolt, so I guess I need something else you think?
View attachment 70232

Oh also here's the model number(s) off the machine itself:
24A-070J799
247.77013.0

And the serial number is:
1H198G70100

According to the parts diagram it is a 3/8-24 bolt 2.75 inches long

 

[l008com]

Are you referring to the removal tool or the bolt that holds the impeller on to the motor?

 

[Laabk2]

Are you referring to the removal tool or the bolt that holds the impeller on to the motor?

The bolt that retains the impeller.

 

[l008com]

I'm not looking for that, I'm looking for the threading in the impeller itself, that you would use with the removal tool or with the right sized bolt, to remove the impeller.