Briggs 675 Engine on LIDER Mower: Oil Found in Air Filter, Reduced Power

Hello, I have a problem with the Briggs 675 engine. It's already season 7 and so far everything has been fine. But today I noticed that the air filter is wet with oil and the engine seems to have 1/3 less power. I would like to add that it does not smoke, it fires properly and has equal speed. Is this the end of this engine or is it enough to regulate etc?

It was not tilted "in the wrong direction" sometimes and it did not leak to the filter?

He was but 2 months ago and for a while. It was foggy then, but not now. What about the lack of power? The grass is not too high, it is about 15 cm long, and the baskets are 5 cm long, and sometimes it may not be choked to zero, but you can hear that it has little power.

Misiek85 wrote:

What about the lack of power?

As the filter is "oily" and wet with oil, it can have problems with suction and mixture composition and thus weakens. The second thing is how it automatically "blows" with oil, it can also be a problem with blowing the rings to the crankcase and thus blowing oil into the filter ...

How could that make any sense? What suction, what oil on the filter? Oil on the filter is a sign of loose valves. Maybe the seals let go, or it is enough to run in the valves, or maybe it is quite trivial to adjust the valve clearance.

And this is the oil on the filter:

Misiek85 wrote:

It's already the 7th season and so far everything has been ok. But today I noticed that the air filter is wet with oil and the engine seems to have 1/3 less power.

szymek.n wrote:

How could that make any sense? What suction, what oil on the filter?

And it has and it has a lot, the air filter is connected by a pipe to the crankcase, and when the engine gets "blows" to the crankcase due to wear, the entire filter gets wet with oil and then the engine sucks too much fuel instead of sucking air. I'm not saying you're wrong with the valves, but it's worth checking everything out. I know this from my own experience with an old lawn mower.

I understand. What about the pneumothorax valve? I read that it may also be the reason. Where to look for it and how to check if it is ok?

I try to change the oil and filter every season. Oh, there was a mesh with a sponge the size of a filter under the filter flap. I took it off a long time ago. Is it okay? What about engine power? You can somehow check if it has the right one, if not, some kind of regulation.

Misiek85 wrote:

You can somehow check if it has the right one, if not, some kind of regulation.

This can only be checked by the compression pressure.

Misiek85 wrote:

What about the pneumothorax valve?

There is probably no such thing, the crankcase is connected to the filter housing and all oil vapors and other "garbage" from the crankcase are directed to the air filter and through the carburetor back to the cylinder, but it is fine if there is no fumes, too much oil. if there is too much of it, you have to look for the cause.
What part do you write about "such a mesh with a sponge the size of a filter", I do not know what it can be.
In my case, there is a plate in the filter housing that covers this outlet of the tube / vapors that the crankcase vapors are directed to this plate, they must reflect on it and come out through gaps around this plate, oil droplets that can be there and if there were any they collect too much on this plate and drip down the filter housing and just fly out. until there are too many of them, the air filter has no right to oil.

Rycho T wrote:

There is a pneumothorax valve

It may be, but I don't know what it looks like and where it is, my knowledge is only knowledge from my own experience and my own practice. I do not do it "professionally" and so "deep" I did not penetrate the construction of engines, but I can fix the whole neighborhood of my buddies as soon as the mower starts to "fix" it runs and "help".

Rycho T wrote:

How do you fix such basic matters you don't know?

Somehow I manage, I have a technical sense and I can handle every mechanic, but maybe I have come across it, but I don't know that it is called "pneumothorax valve" ...

Rycho T wrote:

If this hole in the pneumothorax becomes clogged, it can hit the filter quite well with oil.

A similar hole in a similar engine (not the same as in the photo, but I do not remember what type it is), it was probably in some 3.5 HP Briggs engine in the flap covering the valve lifters, but I would never have thought that it was a "pneumothorax valve" , I always left the assumption that if this is what you need and it must be clean, free, because that's why it was placed there ...

I understand and where to look for this valve, I have to dismantle the gasoline or the engine?

Ok, I'll take off the muffler in a week and see what's in there.

Hello, and I still have a question, if I had to buy a new mower, which one should I choose? I am keeping an eye on Alko 525vs, makita plm5600, stiga 55sb or Cub Cadet. Or something else entirely. I am asking for advice. 22ary garden and difficult terrain, large unevenness of holes, etc. I want something that will be durable and strong, especially wheels and housing.

Friend, if you have a plot of land to mow 22 acres, then buy a tractor. "Agriculture" experts believe that a mowing tractor should be used from 5 to 6 ares. However, if you plan to buy a "push" or "self-propelled" mower, in addition to mowing your plot in difficult terrain, I suggest you buy a mower with a powerful 2T engine.

I do not know if they are with a 2T engine. I have not seen such in stores. I have nowhere to keep the tractor and besides, I have a lot of trees and rockeries, so maneuvering will be difficult.

Hello, after thinking about it, I chose two models. Alko 525vs and makita plm5600n. Which one to choose? Maybe you have some experience?