Oil spraying out oil fill port on Briggs & Stratton

[CountryBumkin]

I know this is not a small engine forum but I figure you guys would be able to help.
I received a small 10HP portable generator from a family member that upgraded. It's a 6000W Coleman Powermate.

I cleaned fuel system and changed oil. The engine started right up. Sounds okay to me - but I'm not a small engine guy.

There was a little oil in the breather tube to air cleaner so I decided to open the oil fill cap at the base of the crankcase and have a look. This is one of those little yellow caps that screws into a boss on the crankcase (no dipstick). Oil is full when it is reaching threads for cap.

With the engine running there is a lot of oil spraying out of the filler port.

I have never removed the filler cap on a running engine so I'm not sure what is normal. I don't know if this spray due to the crank spinning or if this is engine blow-by.

What is normal?

 

[100 td]

Just check oil level when engine not running, the engine uses either splash lubrication or oil pump(most likely splash for that size) but no matter as the crankcase pressure pulsations from the piston going up and down will push the oil out the filler hole.

 

[85Hokie]

I know this is not a small engine forum but I figure you guys would be able to help.
I received a small 10HP portable generator from a family member that upgraded. It's a 6000W Coleman Powermate.

I cleaned fuel system and changed oil. The engine started right up. Sounds okay to me - but I'm not a small engine guy.

There was a little oil in the breather tube to air cleaner so I decided to open the oil fill cap at the base of the crankcase and have a look. This is one of those little yellow caps that screws into a boss on the crankcase (no dipstick). Oil is full when it is reaching threads for cap.

With the engine running there is a lot of oil spraying out of the filler port.


I have never removed the filler cap on a running engine so I'm not sure what is normal. I don't know if this spray due to the crank spinning or if this is engine blow-by.

What is normal?

you cannot check the oil at the filler port......while running, it will come out like no tomorrow!!! So - level ground, either check dipstick or the edge of filler port. Add or delete as necessary

 

[Tooljunkie]

There is a step of sorts in the fill port, think that is your oil level. If ifs an angled port, bottom of threads is the fill to line.
Opening a briggs oil port while running-Ya,don't do that....

 

[100 td]

Just a note on oil level, check your model here to get the correct oil level, my older 7hp briggs engine was a fill to the top of the threads/overflow like the honda engines are, your particular briggs may be lower.
https://www.briggsandstratton.com/na/en_us/support/manuals.html

 

[CountryBumkin]

I know not to check oil level with engine running. I know what the correct oil level is.

What I was trying to do, was to determine if engine has bad rings and excessive blow-by.

In another forum it was said to leave the screw-in dipstick loose (this is an engine where oil filler is on a tube a long ways above crankcase) and if the filler cap rattled/floated around it means excessive blow by. I don't have this style oil filler - but I wasn't sure what I would see with the filler at the crankcase level.

Well, there was a lot of oil spraying out. It shot out at least a couple of feet.

Is this normal or a sign that I have excessive blow-by.

Now that I've seen this I'm not sure if it's normal of not.


how to check this - maybe I should try a cylinder leak down test like on multi-cylinder automotive engine.

 

[skeets]

To be honest just run the beast and dont worry, IF and when it craps out, BS motors aint hard to rebuild. I really hate to say it, but the HF predator motors might be cheaper than rebuilding and they are either a Honda or BS knock offs. From what I hear and read many parts are interchangeable, go figure. Keep oil in her and check it and dont over think things,

 

[Dr Honda]

Don't run any engine with the fill port open. You will get spry.


On a small engine like that... just make sure there's oil in it... and don't worry.

 

[85Hokie]

I know not to check oil level with engine running. I know what the correct oil level is.

What I was trying to do, was to determine if engine has bad rings and excessive blow-by.

In another forum it was said to leave the screw-in dipstick loose (this is an engine where oil filler is on a tube a long ways above crankcase) and if the filler cap rattled/floated around it means excessive blow by. I don't have this style oil filler - but I wasn't sure what I would see with the filler at the crankcase level.

Well, there was a lot of oil spraying out. It shot out at least a couple of feet.

Is this normal or a sign that I have excessive blow-by.

Now that I've seen this I'm not sure if it's normal of not.


how to check this - maybe I should try a cylinder leak down test like on multi-cylinder automotive engine.

The old school method for checking rings and compression problems, that's when you do not have the leak down tester. Cold engine, compression test, record - table spoon oil, recheck - if compression goes up a bit - typically the rings are not sealing as good as they should. I have had mowers that the pcv had sooo much oil kicking back that the engine would barely run......that's when you block off that carb port, allow those terrible gases to escape into the great outdoors...... terrible me!

 

[CountryBumkin]

To be honest just run the beast and dont worry, IF and when it craps out, BS motors aint hard to rebuild. I really hate to say it, but the HF predator motors might be cheaper than rebuilding and they are either a Honda or BS knock offs. From what I hear and read many parts are interchangeable, go figure. Keep oil in her and check it and dont over think things,

Yeah. Your right.
Seems to be running fine. Why go looking for trouble,

 

[Tooljunkie]

Excessive blow by, nope, bad rings equals smoke. The garbage dump mower i use a few times a summer runs but smokes under load. Was a lot worse but i tightened the cylinder head. It was loose, suprised it ran at all.

 

[torch]

This is one of those little yellow caps that screws into a boss on the crankcase (no dipstick). Oil is full when it is reaching threads for cap.

That sounds like a splash-lubed motor. No oil pump, no oil filter. There's usually a little paddle on the crank to splash the oil around vigorously for lubrication, so oil splashing way out of the fill hole when the cap is removed is to be expected.