Pressure in the oil pan

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CubHunter
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Pressure in the oil pan

Postby CubHunter » Fri Jul 14, 2017 9:26 pm

When I changed the oil on Massey I noticed pressure coming from the vent on the dipstick. Pulled the stick and was rewarded with an oil shower. How much pressure is acceptable? And I am planning on aa compression test.

Ohiowoodchuck
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Re: Pressure in the oil pan

Postby Ohiowoodchuck » Fri Jul 14, 2017 9:40 pm

That's probably not good. Sounds like you got some bad rings that's causing the blow-by. Better do a leakdown test.

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Don McCombs
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Re: Pressure in the oil pan

Postby Don McCombs » Fri Jul 14, 2017 10:52 pm

I'm a little confused here. Did you pull the dipstick with the engine running or off?
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CubHunter
Posts: 37
Joined: Sun May 28, 2017 6:26 pm
Zip Code: 45862
Tractors Owned: 1948 F Cub " Massey"
Location: Mendon, Ohio

Re: Pressure in the oil pan

Postby CubHunter » Sat Jul 15, 2017 7:10 am

At a low idle.

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ricky racer
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Re: Pressure in the oil pan

Postby ricky racer » Sat Jul 15, 2017 7:25 am

There should be no pressure in the oil pan. Crankcases are vented to keep that from happening. Check the oil level. The crankshaft should not contact the oil in the pan. I suspect that the level is too high and the crankshaft hitting the oil is what is causing the oil to be thrown out at you.
Should there be a crack in the block or head, coolant will drain into the oil pan causing the level to raise too...
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Gary Dotson
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Re: Pressure in the oil pan

Postby Gary Dotson » Sat Jul 15, 2017 7:26 am

Pulling the dip stick on a running Cub opens up a very large opening to a spinning crankshaft. Spinning crankshafts sling lots of oil! I don't think it's abnormal at all.

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Re: Pressure in the oil pan

Postby Crimson Tim » Sat Jul 15, 2017 8:06 am

The cap on the end of the dipstick is a breather vent. Is it plugged with crud? Soak that junk out and clean it up so it vents properly. Then it won't build up pressure.
That it was trying to build up pressure there does imply ring blow-by. I suggest dry, then wet compression tests to evaluate ring condition. Also, lot of forum members seem to be fans of seafoam for ring rejuvenation in certain circumstances. Can't hurt!

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Re: Pressure in the oil pan

Postby Eugene » Sat Jul 15, 2017 8:14 am

Check the engine oil level with the engine off. If engine has been running, wait a couple of minutes after engine shut off to check oil level.

Hydraulic fluid leak into crankcase from hydraulic pump, common cause of over full condition.
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John *.?-!.* cub owner
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Re: Pressure in the oil pan

Postby John *.?-!.* cub owner » Sat Jul 15, 2017 11:13 am

With the connecting rods dipping into the oil and splashing it everywhere, oil being thrown out the dipstick tube is normal with the engine running. Cub engines have 2 venting systems, one is through the mesh in the cap on the dipstick, which does need to be cleaned with solvent occasionally. The second is a small breather pipe that goes from the front of the block into the top of the breather which is intended to suck fumes out of the crankcase and burn them. The tube and the fitting on the block are frequently plugged with sludge and nead to have a wire run through them and flushed out with a solvent. Late model cubs did not have the breather pipe I just mentioned. All the items mentioned earlier are good things to pay attention too also.
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CubHunter
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Re: Pressure in the oil pan

Postby CubHunter » Sat Jul 15, 2017 3:24 pm

It isn't just the oil splash, there is air coming out of the tube in whafts like exhaust with surprising force. She runs smooth but seems to lack power as well. I will be checking all suggestions tomorrow including a compression test, wet and dry.

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Re: Pressure in the oil pan

Postby ntrenn » Sat Jul 15, 2017 7:45 pm

That much blowby suggests worn rings. My 65 came to me as a non-runner, but had very worn and stuck rings - 0.120 end gap. It. Probably had loads of blowby when the PO parked it.

Ohiowoodchuck
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Re: Pressure in the oil pan

Postby Ohiowoodchuck » Sat Jul 15, 2017 7:50 pm

Do a pressure test. Make sure both valves are closed in that cylinder and put air to it. If you hear air in the intake bad valve same with the exhaust. If air is coming out another cylinder it's usually a headgasket and if you hear it coming out the dipstick usually rings are bad. All this this is usually hard to tell with a compression test. I have had engines show good compression but fail the leakdown test.

CubHunter
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Re: Pressure in the oil pan

Postby CubHunter » Sun Jul 16, 2017 2:01 pm

Went out to get the compression tester, came home with a woods deck...oops.
Last edited by CubHunter on Sun Jul 16, 2017 7:32 pm, edited 1 time in total.

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ricky racer
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Re: Pressure in the oil pan

Postby ricky racer » Sun Jul 16, 2017 6:11 pm

CubHunter wrote:Went out to get the compression tester, came home with a wood deck...oops.

:lol: :lol:
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Eugene
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Re: Pressure in the oil pan

Postby Eugene » Sun Jul 16, 2017 6:57 pm

So much for working on the Cub for a while. Bet Momma says deck first.
I have an excuse. CRS.


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