Briggs and Stratton 18.5 OHV pushing oil out the exhaust pipe.

[StarTech]

I regularly have to dress the head & the block because they errode where the gasket is blown.
Did you check both for square & for hollows with a strait edge before you replaced the gasket.
It would not be the first time a brand new gasket failed in service.

Good point as the next to last head gasket replacement I found the head with a .005" warpage at the blown area.

And doing leak down before and after is just an extra non-invasive measure to verify things.

 

[Bat57]

I regularly have to dress the head & the block because they errode where the gasket is blown.
Did you check both for square & for hollows with a strait edge before you replaced the gasket.
It would not be the first time a brand new gasket failed in service.

Thanks. I will double check that.

 

[Bat57]

Good point as the next to last head gasket replacement I found the head with a .005" warpage at the blown area.

And doing leak down before and after is just an extra non-invasive measure to verify things.

Thanks for the info. So why would the oil stop pushing out the muffler when i disconect the breather reed hose from the carb?

 

[Born2Mow]

Oil level exactly on the full mark? Not over or under?
Does the oil smell like gas? Smell the dipstick.

It seems you never answered this question, but it is extremely important.

Gasoline can migrate into the oil, dilute the lubrication capability, and end up destroying your engine.

 

[Bat57]

It seems you never answered this question, but it is extremely important.

Gasoline can migrate into the oil, dilute the lubrication capability, and end up destroying your engine.

There is no gas in the oil. Never was. I have had that issue before so i always smell the oil and check fuel level. The oil level never went up, as it would if fuel was going through cylinder into the the sump cover. The oil level would start at just above the halfway point and end up at the add oil bottom mark after running a few minutes. Thanks.

 

[slomo]

There is no gas in the oil. Never was. I have had that issue before so i always smell the oil and check fuel level. The oil level never went up, as it would if fuel was going through cylinder into the the sump cover. The oil level would start at just above the halfway point and end up at the add oil bottom mark after running a few minutes. Thanks.

You need to get into the habit of topping off the oil exactly on the full mark prior to every mow.

No fuel in the gas, good to know.

slomo

 

[slomo]

You guys need to go to a glass shop. Get a 1/2" thick, 12" x 16" piece of plate glass. Lay some wet/dry sand paper on it. This is how I true up parts now. Let the paper do all the work. Don't try to press down to help. You will make the part uneven doing that. Great for cylinder heads and those old pulsa-jet carb flanges.

slomo

 

[slomo]

Thanks for the info. So why would the oil stop pushing out the muffler when i disconect the breather reed hose from the carb?

Your oil sump slash breather system is pretty cool. The breather is a ONE WAY, pressurized air OUT of the engine pipe to the air filter. The breather keeps a small vacuum on the oil sump limiting oil pooling at the rings. This help with oil consumption. Your oil dipstick tube should have an O-ring or gasket. This is to SEAL the tube to keep the vacuum IN the oil sump. The breather should have a small restriction to limit oil flow OUT of the breather tube into the air filter box. Probably some foam in there too to catch oil vapors and return to the sump.

I would check your dipstick tube for a proper gasket. Clean the threads off. Probably a ton of oil and grit around there.

Next I would check or replace your breather system all the way to the carb. You said this was an old engine. Might have an oil/grit/dirt plug in it some where causing it to not work.

Lastly did you end gap check and set your rings? Did you measure the bore before and after the hone job? Is your cylinder even round?

So if everything above it tip top, sounds like the rings didn't seat. Must have a ton of blow-by.

slomo

 

[bertsmobile1]

Thanks for the info. So why would the oil stop pushing out the muffler when i disconect the breather reed hose from the carb?

Oil gets into the engine from 3 sources
1) past the rings
2) down the intake valve guide
3) through the carb via the breather

The driving force for this excessive pressure in the crankcase .
So in your case the breather is restricting the flow of crankcase gasses and the oil is blowing out the breather then into the engine via the carb

 

[Bat57]

Your oil sump slash breather system is pretty cool. The breather is a ONE WAY, pressurized air OUT of the engine pipe to the air filter. The breather keeps a small vacuum on the oil sump limiting oil pooling at the rings. This help with oil consumption. Your oil dipstick tube should have an O-ring or gasket. This is to SEAL the tube to keep the vacuum IN the oil sump. The breather should have a small restriction to limit oil flow OUT of the breather tube into the air filter box. Probably some foam in there too to catch oil vapors and return to the sump.

I would check your dipstick tube for a proper gasket. Clean the threads off. Probably a ton of oil and grit around there.

Next I would check or replace your breather system all the way to the carb. You said this was an old engine. Might have an oil/grit/dirt plug in it some where causing it to not work.

Lastly did you end gap check and set your rings? Did you measure the bore before and after the hone job? Is your cylinder even round?

So if everything above it tip top, sounds like the rings didn't seat. Must have a ton of blow-by.

slomo

Thanks for the Information, I will check these things.