Oil coming out fuel pump

[Olrecker]

Got a pic of the fuel pump ? One side should receive the pulse from case pressure differential and the other side should only have gas in the chamber . Maybe the diaphragm is leaking side to side ?

The ports are labeled clearly and hasnt changed. A bit defeated as the head needed sanding and same result. Thinking I need to do a leak down test like others have mentioned. I will need to figure the setup I need and get it. Its unfortunate because the tractor itself is in really nice condition. It runs strong and wouldn’t think anythings wrong if it didn’t bleed oil out the pump

 

[slomo]

You must clean all the old head gasket material prior to lapping.

Lap block and head where head gasket sits.

Spray hi-tack sealant on the gasket.

Chase head bolts and threads with tap and die. Blow out with shop air.

Clean bolts and threads with brake cleaner. Threads must be clean and dry. Any old oil on the bolt threads will stray the proper bolt torque. Head bolts should be torqued dry.

Do a leak down as suggested. Could be dead rings or head gasket again.

 

[grumpyunk]

If you had the fuel pump out of normal positioning, it could have gotten crankcase oil behind the diaphragm. Then it would take time for it to get pushed out. If there was enough oil behind the diaphragm, it could make the pump inoperative or cut its performance. There has to be a path from the crankcase to the diaphragm for the pulses to make the pump function.
I think I would give it some time to quit... if it is otherwise working ok.
No mention of blowing through the vent into the intake? If that is so, I think you are done and it will work fine if you let the pump get rid of its oil load.
tom

 

[slomo]

Wispy smoke when I pull the dip stick too

 

[Olrecker]

Does the wispy smoke indicate something contrary to Grumpyunks optimism?

It has been running strong since the beginning but i did test cut around the house and it didnt smoke which is a plus but the oil was still bubbling out the fuel pump. I did reuse the valve cover gasket, it was new from the first head gasket change. Does it matter all that much outside maybe leaking oil?

So I guess I need a leak down gauge. I already have an air compressor. I am going to do that before anything else. Any recommendations for a first purchase with rare usage. Dont think I need a snap-on

 

[Red Good]

Borrow from an auto parts store ? Do a compression test 1 st .

 

[Craftsman Garage]

I'm surprise no one thought of this, is the fuel pump bad?

 

[grumpyunk]

Wispy smoke from the dipstick tube is normal immediately after shutdown. There is a hurricane of oil inside when the engine is running. That will create a mist that can look like smoke.
The pump could fail with a punctured diaphragm, but likely would not work well. The crankcase pressure pulses would tend to push oily vapor from the crankcase hurricane through the diaphragm, but that would make the pump weak as it would not develop pulses as strong, and would likely lessen the diaphragm motion, thus weaker or no pumping action. In most designs, a leaky diaphragm would allow fuel into the crankcase... The 'other' side of the diaphragm is exposed to fuel inside the pump chamber where there are two check valves. One draws fuel into the chamber as the spring moves the diaphragm back to its at-rest position. When the pulse occurs, it pushes the diaphragm back and forces fuel out the check valve leading to the float bowl. The pump could leak the pulses if it was not sealed properly, but likely would again not work well. Enough oil on the 'back' side of the diaphragm could hinder diaphram movement, and thus pumping. If oil is leaking from the diaphragm vent hole it could be leftover from tilting/rotating the engine allowing oil to travel from the crankcase.
tom

 

[Olrecker]

The fuel pump seems to be pumping gas. The throttle is responsive and engine is smooth. I will look for a replacement better than the amzn chinese one I got, that never worked. Getting it off and on is a task with minimal space. I was going to try mowing some after checking oil as the last time was better than original before the work it would start smoking after 50ft of mowing

 

[gregjo1948]

Thanks for reading. I have a JD LA105 with a 19.5 single cylinder OHV. Replaced the head gasket, common cause, the mower starts and runs great but after a minute or two it starts bleeding oil out the fuel pump and breather tube. Wispy smoke when I pull the dip stick too. I adjusted the valves after the head gasket, took the fly wheel off and checked the valve which looked fine but there was no hole for oil to return to the crankcase. I am hesitant to tear it down for rings because it runs great otherwise. The mower has 180hrs. Anything else that can build pressure like that? Oil is slightly low from having come out and no fuel smell

Sounds like it needs rings. Your getting blow-by causing pressure in the crankcase. Are you sure the valves are adjusted correctly? There is a compression relief built into the cam and you may have inadvertently adjusted the valves incorrectly.