Sounds like the crankcase is pressurizing. Most likely cause is blown head gasket.
#3
grumpyunk
I would at least check the oil level on the dipstick and give the oil a smell test. If the level is high, and the oil smells of fuel, then you may have a leaky float valve, feeding fuel to the crankcase, diluting the oil, and raising the level such that it gets blown out at the pump. Also check that the crankcase is sealed properly to prevent 'pumping' action in the crankcase, causing over pressure in the crankcase.
If you have good compression, good power, and there is no indication of oil burning in the exhaust, blue smoke, your rings are likely in good condition, so look elsewhere for a reason for the crankcase pressurizing.
tom
hi , if oil is blowing from vent hole on vaccuum lift pump on engine and a vapour is comming from oil fill tube , and engine uses oil , blows blue smoke
most liklely a blown head gasket , single ohv briggs engines are famous for it,remove valve cover- make sure valve clearance is set at 0.003 inlet ( the alloy push rod at btm ) thous and 0.005 thou ( the steel push rod at top ) these will need to be set @ 1/4 past tdc on compression stroke , then you will need to pressurize cylinder with compressed air while its at tdc compression stroke , and listen for air escaping into push rod tunnel if so blown head gasket confirmed
obtain head gasket set pull the cyl head and clean up and replace gasket , give the inlet and ex valves a quick grind and lap to seats
reassemble and let er rip cyl head bolt torgues are 250 in/lb
Watch this video: www.youtube.com/watch?v=NM28FSoUGLQ The first part is just for laughs but he does talk about oil coming out from the fuel pump vent and presents a good example of how to go about a proper repair.
Watch this video: www.youtube.com/watch?v=NM28FSoUGLQ The first part is just for laughs but he does talk about oil coming out from the fuel pump vent and presents a good example of how to go about a proper repair.
Glad ya liked it. While I don't agree 100% with everything he does, his videos are funny and informative. If you have some time you should check out his channel and watch a few more.
Glad ya liked it. While I don't agree 100% with everything he does, his videos are funny and informative. If you have some time you should check out his channel and watch a few more.
Not quite as funny as it looks.
Firstly he omitts to show the removal of the very hard to see tiny black self tapper on the inside of the inlet manifold through the air fliter chamber floor.
HE tells you to clean up the surfaces then shows you a hard heavy wire brush in a die grinder.
Use that on the combustion chamber, fine, Use it on the joint faces and you will be in trouble. You clean that face with a scotch brite pad, nothing harder.
He omitts to tell you to check the head for undercuts where the gasket has been leaking.
He also omits to tell you to lap the head and if you do not lap the head on an Intek, it will be back for a warrantee head gasket replacement before the end of the season.
This is a lot more imortant than faffing around with the valves.
I have done better than 60 intek head gaskets and never found a loose guide.
OTOH the first 3 I did came strait back, blown again.
When I first stated doing this full time it was a very steep learning curve.
While any 1/2 reasonable mechanic should be able to repair small engines, there are a lot of little things that once known make the difference between profit & loss.
If you have no idea of what you are doing Taryls vids might be encouraging, but the lack of detail and the ommissions make them problematic.
It is a well know teaching technique to add a lot of humour to lessons so he is on the right track, just a little sloppy particularly when comparred to some one like Donny Boy.
It seems like his main aim is to be funny rather than factual.
The first one I saw ( been through all of them ) I though that he was just taking the piss out of all the back yard ego maniacs posting twaddle but after a while it was obvious he was trying the be helpful , not just sarcastic.
#11
Michael72
"While any 1/2 reasonable mechanic should be able to repair small engines, there are a lot of little things that once known make the difference between profit & loss.
If you have no idea of what you are doing Taryls vids might be encouraging, but the lack of detail and the ommissions make them problematic."
Agreed....I guess cleaning with that heavy wire brush is do-able in experienced hands if you just tickle it but with a novice it can go very wrong!....I have never had one back as yet looking for another head gasket or guides but have some in needing a second gasket due to a sloppy first fix I presume giving the hours work on mower between them....cam lobes are ify on these IMO....400hrs on one just in, back firing etc....
