Export thread

Excessive crankcase pressure on 19.5 briggs oppy?

#1

the_scrapsman

the_scrapsman

Hello, I got a new issue where I thought air was blowing up my intake which it still kinda does it just weak. OK back to topic. I mistook the air for coming up the intake when it's actually the breather. The engine runs like garbage, uses oil, but both cylinder exhaust pipes are equally warm but does not consistently fire. When shutting off the engine, you can hear the breather blow out very hard winds and can still hear it standing 10 feet away. I'm pointing towards the rings but I'm not sure.
Thanks, -ray


#2

R

Rivets

Two things normally cause this condition. Either a blown head gasket or oil level too high, due to fuel flowing into the crankcase. If the oil level is correct run the engine with the dipstick loose on the dipstick tune. If the dipstick bounces around your head gasket is blown.


#3

the_scrapsman

the_scrapsman

Rivets said:
Two things normally cause this condition. Either a blown head gasket or oil level too high, due to fuel flowing into the crankcase. If the oil level is correct run the engine with the dipstick loose on the dipstick tune. If the dipstick bounces around your head gasket is blown.
Click to expand...
Ok. Oil level is halfway below full and itnquits using oil at that point. There's gas in the crankcase


#4

the_scrapsman

the_scrapsman

Rivets said:
Two things normally cause this condition. Either a blown head gasket or oil level too high, due to fuel flowing into the crankcase. If the oil level is correct run the engine with the dipstick loose on the dipstick tune. If the dipstick bounces around your head gasket is blown.
Click to expand...
Also before this it only said that happens to OHV while this is a flathead motor but I'm not positive on that


#5

R

Rivets

If you have gas in your oil, it is probably coming from the carb. The float needle in your carb is not closing properly. This is resulting in fuel flowing nonstop from the tank, through the carb, into the cylinder causing hydro locking. Remedy, you will need to remove the carb and replace the float needle and possibly the seat, depending on which brand of carb you have. Oil will also need to be changed, as it is probably contaminated by fuel flowing past the rings. Some fools will say to just install a shut off valve in the fuel line and make sure you turn off the fuel after each use. If you forget, you will be back to the original problem. I always recommend fixing the problem right the first time, but make sure you read my signature.


#6

the_scrapsman

the_scrapsman

Rivets said:
If you have gas in your oil, it is probably coming from the carb. The float needle in your carb is not closing properly. This is resulting in fuel flowing nonstop from the tank, through the carb, into the cylinder causing hydro locking. Remedy, you will need to remove the carb and replace the float needle and possibly the seat, depending on which brand of carb you have. Oil will also need to be changed, as it is probably contaminated by fuel flowing past the rings. Some fools will say to just install a shut off valve in the fuel line and make sure you turn off the fuel after each use. If you forget, you will be back to the original problem. I always recommend fixing the problem right the first time, but make sure you read my signature.
Click to expand...
I've used two different carbs the one I got on now is new. It also smokes if it refill the oil thenburns it


#7

R

Rivets

We’re they OEM carbs or aftermarket? If aftermarket it wouldn’t surprise me that both are bad. This is especially true if you are getting gas in the oil. It they were OEM, you’ll have to pull the head for further diagnoses.


#8

the_scrapsman

the_scrapsman

Rivets said:
We’re they OEM carbs or aftermarket? If aftermarket it wouldn’t surprise me that both are bad. This is especially true if you are getting gas in the oil. It they were OEM, you’ll have to pull the head for further diagnoses.
Click to expand...
Ones genuine the other aftermarket. I combined parts from each to make one good carb I think it's something more critical


#9

R

Rivets

As I said, if there’s gas in the oil, probably a carb problem.


#10

the_scrapsman

the_scrapsman

Rivets said:
As I said, if there’s gas in the oil, probably a carb problem.
Click to expand...
Maybe...but she's using oil pretty badly and smoking and it sgrugg,struggles, to Rev up from idle and it'll try to ztall when quickly putting it at idle


#11

Scrubcadet10

Scrubcadet10

the_scrapsman said:
Maybe...but she's using oil pretty badly and smoking and it sgrugg,struggles, to Rev up from idle and it'll try to ztall when quickly putting it at idle
Click to expand...
Could be running bad from too much fuel....


#12

the_scrapsman

the_scrapsman

Scrubcadet10 said:
Could be running
Click to expand...

Scrubcadet10 said:
Could be running bad from too much fuel....
Click to expand...
Hmm maybe but I this it's definitely more critical


#13

R

Rivets

That’s my best guess, hopefully you’ll prove me wrong. Please let us know what you find.


#14

H

hlw49

the_scrapsman said:
Also before this it only said that happens to OHV while this is a flathead motor but I'm not positive on that
Click to expand...
you know if you were to post the model type and code # it would cut out a lot of the guess work.


#15

the_scrapsman

the_scrapsman

hlw49 said:
you know if you were to post the model type and code # it would cut out a lot of the guess
Click to expand...
Mk


#16

the_scrapsman

the_scrapsman

hlw49 said:
you know if you were to post the model type and code # it would cut out a lot of the guess work.
Click to expand...
It's a 42E707-2275 code is 0106085A


#17

H

hlw49

That carb has the fuel pump built into the carb. and the diaphragm could have a hole in it drawing fuel into the crank case. Did you change the oil? It could be too thin and getting past the rings and causing it to smoke and use oil. It could also be the crank case breather blowing oil into the carb. through the breather tube.


#18

S

STEVES

1st - fix carb
2nd - change oil


Footer Links 1

Top