What compression testor for saws with 10 mmm plug are you guys using?

[Lone Wolf]

Just had some 201 T's come in the shop and I need to test compression on them. What do you guys recommend? I tried an adapter from 14mm to 10mm and it says everything in my shop including new stuff and a friends 201 T only has 90 -100 lbs of compression? WTF Can a 3mm shorter thread on the adapter give a false reading?

 

[Manofstihl661]

What head unit do you use? I use a snapon I got cheap and have a 10mm attachment to use with it.

 

[Manofstihl661]

Isn’t it if the valve isn’t actually at the end of the tube, if you have any kind of adapter you lose 50psi? I’m pretty sure that’s what I remember. I had bought a craftsman tester first and if I used a little screw on adapter or whatever it always blew low. Soon as I switched it was right on and pretty sure exactly 50psi dofferent

 

[Lone Wolf]

What head unit do you use? I use a snapon I got cheap and have a 10mm attachment to use with it.

A US gauge and a Snap on both I cross checked and they are accurate. The problem is in the adapter length or it leaks.

 

[Lone Wolf]

Isn’t it if the valve isn’t actually at the end of the tube, if you have any kind of adapter you lose 50psi? I’m pretty sure that’s what I remember. I had bought a craftsman tester first and if I used a little screw on adapter or whatever it always blew low. Soon as I switched it was right on and pretty sure exactly 50psi dofferent

Well that would explain it! I was unaware of that. I would like to get a specific gauge for this task. Any ideas?

 

[Manofstihl661]

This is mine. It was nuts on. If you want I’ll send it to you so you can borrow it for your stuff and try it to see the difference. Unless that’s what you already have.

 

[Manofstihl661]

That’s just the tube of course. I actually have 2 snapon head units because I can’t pass a deal lol.

 

[Lone Wolf]

This is mine. It was nuts on. If you want I’ll send it to you so you can borrow it for your stuff and try it to see the difference. Unless that’s what you already have.

Generous offer but maybe I better get one of them .

 

[Manofstihl661]

The 10mm was the hardest for me to find when I got mine. But you can search eBay for the tube itself and people seem to want around $40 a pop

 

[Lone Wolf]

I am curious as to what compression readings from what saw you get with that set up
?

 

[Manofstihl661]

Wellllll let me go do one for you...standby

 

[Lone Wolf]

So standard reach would be what I want?
https://store.snapon.com/Compressio...n-Gauge-Standard-Reach-M10-x-1-0-P644048.aspx

 

[Manofstihl661]

576xp AT stock

 

[Lone Wolf]

576xp AT stock

Perfect. Did you see the Snap On link I posted? Ist that the right hose?

 

[Manofstihl661]

Yes sir just saw it. Looks the exact same to me just pretty and new.

 

[Lone Wolf]

Yes sir just saw it. Looks the exact same to me just pretty and new.

Well thanks for the help.

 

[Manofstihl661]

Well thanks for the help.

Anytime! Glad I could

 

[Manofstihl661]

This is a video someone shared with me when I first got the craftsman.

 

[old guy]

I got a 10 m/m adapter with a valve in the end from specialty chainsaw, it screws on the end of the tester hose, I left the other valve in the hose, that does not seem to be a problem.
My 550 husky shows 177 lbs, base gasket delete.

(edit) Actually it is Design Technoledgy, home of the tiny tach.

 

[Lone Wolf]

This is a video someone shared with me when I first got the craftsman.

According to this we see now what happens to cause it.
https://www.mullengineering.com/rt/files/2_tech_docs/THE TRUTH ABOUT COMPRESSION TESTING.pdf