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Old 17-05-2014, 19:05   #1
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Leaving a Little Penetrating Oil in an Engine

I'm adding a oil pressure sensor to my Yanmar using an unused and plugged port next to the dummy light sensor. I've got a 5mm Allen wrench that fits the plug just fine but it won't budge.

If I remove the other sensor I can inject a little penetrating oil and let it sit a week to do its magic. But what if I don't get it all out?

It's oil, after all.


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Old 17-05-2014, 21:02   #2
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Re: Leaving a Little Penetrating Oil in an Engine

Won't hurt a thing but I bet your going to have to use heat to get that plug out and or an impact driver
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Old 17-05-2014, 21:12   #3
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A squirt of weasel piss inside the cylinder isn't going to hurt anything but my money says it will take more than a squirt of anything to get that plug out. Get it wet with your favorite weasel piss, put a good heavy punch in the Allen recess and whack it hard a few times, wet it again and repeat. Do that for several days before even trying to take it out. When you do try to remove it use an impact wrench.
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Old 17-05-2014, 21:26   #4
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Re: Leaving a Little Penetrating Oil in an Engine

If the Allen wrench won't shift it and rounds off the hex socket (as usual) you can use a hammer and cold chisel around the edge of the plug.
Work different parts of the circumference if you can so you don't dig too deep in one place.
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Old 18-05-2014, 01:41   #5
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Re: Leaving a Little Penetrating Oil in an Engine

Hi Greg,
Have you had the plug out before?. If not are you sure it's not an left hand thread. To remove i would use several doses of plumbers "freeze in a can" stuff
with an impact driver. All the best Ronnie.
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Old 18-05-2014, 04:06   #6
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Re: Leaving a Little Penetrating Oil in an Engine

A good home made penetrating oil I found to be the most successful was a 50/50 mix of acetone and automatic transmission fluid.
The ATF is a very good wicking oil and will get the acetone to where it is needed.
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Old 18-05-2014, 04:48   #7
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Re: Leaving a Little Penetrating Oil in an Engine

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Originally Posted by nigel1 View Post
A good home made penetrating oil I found to be the most successful was a 50/50 mix of acetone and automatic transmission fluid.
The ATF is a very good wicking oil and will get the acetone to where it is needed.
+1

(did we go to the same school?)
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Old 18-05-2014, 05:09   #8
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Re: Leaving a Little Penetrating Oil in an Engine

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+1

(did we go to the same school?)
I don't remember you guys from class +2
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Old 18-05-2014, 05:11   #9
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Re: Leaving a Little Penetrating Oil in an Engine

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I don't remember you guys from class +2
I was the one falling asleep from the acetone.......
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Old 20-05-2014, 11:49   #10
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Re: Leaving a Little Penetrating Oil in an Engine

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Originally Posted by bigman1 View Post
Hi Greg,

Have you had the plug out before?. If not are you sure it's not an left hand thread. To remove i would use several doses of plumbers "freeze in a can" stuff

with an impact driver. All the best Ronnie.

I've tried turning it both ways. And it's on the bottom of the engine so chisels and impact wrenches (which I dint have) are out.

It's been soaking for a few days so we'll see if that helps


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Old 20-05-2014, 13:32   #11
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Re: Leaving a Little Penetrating Oil in an Engine

One good thing about socket plugs is you get a good bite with an Easy Out in a striped out hole. Heck, skip to the chase and start with an easy out..
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Old 20-05-2014, 13:47   #12
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Re: Leaving a Little Penetrating Oil in an Engine

I had the reverse problem. I had an old Volvo with a leaking oil pressure sending unit. When unbolting it broke at the stem-frozen threads. Had to pick the engine to drill and tap with an easy out. About a $1500 job on what should have been $50. Moral: Tread Lightly........
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Old 20-05-2014, 14:00   #13
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Re: Leaving a Little Penetrating Oil in an Engine

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I had the reverse problem. I had an old Volvo with a leaking oil pressure sending unit. When unbolting it broke at the stem-frozen threads. Had to pick the engine to drill and tap with an easy out. About a $1500 job on what should have been $50. Moral: Tread Lightly........

Yes, because when you break off an easy out in something, no drill bit on earth can drill it out.
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Old 20-05-2014, 14:07   #14
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Re: Leaving a Little Penetrating Oil in an Engine

The Allen wrench is holding firm. In fact I'm pulling so hard I'm afraid it'll break.


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Old 20-05-2014, 14:15   #15
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Re: Leaving a Little Penetrating Oil in an Engine

Greg, buy a can of PBlaster. Spray the plug. Get lunch. Spray again. Get a drink. Now come back and it should spin right out like virgin metal. The stuff really is that good.

If that doesn't work, by all means use the freeze spray, or make a slush of dry ice in alcohol and pack that on. A couple of freeze/thaw cycles (remove slush, hit with torch, don't set the alcohol on fire) will break loose all sorts of heavy corrosion.

A hand impact driver with the hex impact bit designed for it is a great idea, once you own one you'll never need it again, but really, I'd bet even money on the PBlaster.
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