Pressure Testing

[dsell]

It's not a chainsaw but I've battled this beast all year. I took it all apart and pressured it to 7 lbs. It won't even hold 3 lbs. It's leaking at the intake boot. I can pump it up to 7lbs and submerged it in a bucket of water. The only place leaking is the boot and I turned the crankshaft while under water. Do you agree these boots should hold pressure or should I only use vacuum? It's a Husqvarna 125BVX blower. Pictures to follow. This system is very close in general to the Husqvarna 50 chainsaw.

 

[dsell]

Pics

 

[Binthewoods]

I’m quite sure that needs to hold pressure otherwise you’ll be running very lean.

 

[lone wolf]

It's not a chainsaw but I've battled this beast all year. I took it all apart and pressured it to 7 lbs. It won't even hold 3 lbs. It's leaking at the intake boot. I can pump it up to 7lbs and submerged it in a bucket of water. The only place leaking is the boot and I turned the crankshaft while under water. Do you agree these boots should hold pressure or should I only use vacuum? It's a Husqvarna 125BVX blower. Pictures to follow. This system is very close in general to the Husqvarna 50 chainsaw.

Where is the boot leaking and how are you sealing it off for the test?

 

[dsell]

Where is the boot leaking and how are you sealing it off for the test?

Appeared to be where the plate goes on the boot. I have vacuum on it now. Started at 12 lbs, down to 5 after 1 min, holding there.

 

[lone wolf]

Appeared to be where the plate goes on the boot. I have vacuum on it now. Started at 12 lbs, down to 5 after 1 min, holding there.

Can you block the engine off without the boot and we can go from there? I think your seal on the boot isn't holding, you see any tears?

 

[dsell]

Can you block the engine off without the boot and we can go from there? I think your seal on the boot isn't holding, you see any tears?

I cannot see any issues. Definitely holds vacuum better than pressure. I'm not certain this was the issue, but I ordered a new plate and boot.

 

[lone wolf]

I cannot see any issues. Definitely holds vacuum better than pressure. I'm not certain this was the issue, but I ordered a new plate and boot.

Sounds like you didn't seal it up tight.

 

[dsell]

Sounds like you didn't seal it up tight.

I don't understand your comment. It's leaking pressure at the factory connection between the boot and what they call the plate. The plate mounts the carb.

 

[dsell]

Pics of test setup.

 

[lone wolf]

I don't understand your comment. It's leaking pressure at the factory connection between the boot and what they call the plate. The plate mounts the carb.

Oh!

 

[Captain Bruce]

It's not a chainsaw but I've battled this beast all year. I took it all apart and pressured it to 7 lbs. It won't even hold 3 lbs. It's leaking at the intake boot. I can pump it up to 7lbs and submerged it in a bucket of water. The only place leaking is the boot and I turned the crankshaft while under water. Do you agree these boots should hold pressure or should I only use vacuum? It's a Husqvarna 125BVX blower. Pictures to follow. This system is very close in general to the Husqvarna 50 chainsaw.

Vacuum is the opposite of pressure, and the boot must be completely sealed at both ends. Bucket of water? All this for a 5 buck part?

 

[dsell]

Vacuum is the opposite of pressure, and the boot must be completely sealed at both ends. Bucket of water? All this for a 5 buck part?

No, the point is to find any air leaks.

 

[Captain Bruce]

No, the point is to find any air leaks.

The "point" is the replace a $5 intake boot on a $100 leaf blower, and get it back to work. Should your "air leak" conspiracy deserve such fantastic efforts, that one hellava blower.......

ANY other 2-cycle mechanics out there, please support what I exalt. I can't take much more water bored bucket dipping........

 

[dsell]

The "point" is the replace a $5 intake boot on a $100 leaf blower, and get it back to work. Should your "air leak" conspiracy deserve such fantastic efforts, that one hellava blower.......

ANY other 2-cycle mechanics out there, please support what I exalt. I can't take much more water bored bucket dipping........

Did someone force you to read it? Let me guess, if it doesn't start it goes in the trash? If you cannot contribute and it's over your head, stay out of it.

 

[lone wolf]

The "point" is the replace a $5 intake boot on a $100 leaf blower, and get it back to work. Should your "air leak" conspiracy deserve such fantastic efforts, that one hellava blower.......

ANY other 2-cycle mechanics out there, please support what I exalt. I can't take much more water bored bucket dipping........

Dipping in water is the best way to pinpoint hard to find leaks. Nothing wrong with that at all.

 

[Captain Bruce]

Dipping in water is the best way to pinpoint hard to find leaks. Nothing wrong with that at all.

How would you propose to solve the leak, once located?

 

[Captain Bruce]

Did someone force you to read it? Let me guess, if it doesn't start it goes in the trash? If you cannot contribute and it's over your head, stay out of it.

Nope. No one can be forced to do anything; this is America.
If it doesn't start, its first inspected for a viable piston, rings, and cylinder......if they are damaged, than its trash.
Contribute is to offer. This is about a simple repair, not a NASA white paper.

Come on dude, its a guy dipping an engine in a Home Depot bucket before simply changing a part, and using a leaf blower.

The tool doesn't warrant redundant experimentation.....thats what kids do. Is everyone on this very informative forum, just keystroking fore the sake of chatting about nothing?

 

[SAWTECH1]

It's not a chainsaw but I've battled this beast all year. I took it all apart and pressured it to 7 lbs. It won't even hold 3 lbs. It's leaking at the intake boot. I can pump it up to 7lbs and submerged it in a bucket of water. The only place leaking is the boot and I turned the crankshaft while under water. Do you agree these boots should hold pressure or should I only use vacuum? It's a Husqvarna 125BVX blower. Pictures to follow. This system is very close in general to the Husqvarna 50 chainsaw.

I normally always replace the manifold on blowers they will show fine cracks around the studs causing leaks at higher pressures. I would just change the manifold out, do not over tighten the screws. Husky has those issues on some of their saws as well. Stihl has other issues, but still can be a pain. Keep working at it you will get there. You can also you strips of rubber which should work good to seal when doing a pressure/ vac test.

 

[BrettS]

Is everyone on this very informative forum, just keystroking fore the sake of chatting about nothing?

That's what you are doing isn't it, just "keystroking" (you are stroking something and it's not keys) and "chatting" about nothing....