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Old 01-10-2016, 12:25 AM   #1
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Oil drain plug - really tight - how to remove?

On our new to us Tiffin Phaeton's 10kw diesel generator, Speedco found the oil drain plug is really tight. So much so there is concern of damaging if applying more force to remove. So they opted to leave it alone and we skipped servicing the genny.

So, now turning my attentions to removing. I figure I will soak it well with PB Blaster a couple three times over a day before next attempting removal.

Other suggestions?

Thx!
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Old 01-10-2016, 12:40 AM   #2
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This is common for a first oil change.
Strange on an older coach
Be sure to get a 6 point socket.

You can also try some cold spray, used in electronics to find bad components.
spray the drain plug only so it will shrink a little, that might help.

Mine was very hard slso.

Dan
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Old 01-10-2016, 07:31 AM   #3
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Seems like this is a common complaint. I read one story where someone thought he was going to have to resort to drilling the plug out! In the end a air impact wrench save the day. Like Dan said, make sure you use a good 6 pt socket of the appropriate size and use a air impact wrench. If you are lucky, it will come off easily like the other fellow's did. Be forewarned, when using a impact wrench the plug comes out FAST and so does the oil . Be prepared.
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Old 01-10-2016, 08:02 AM   #4
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Once you get it out, and if you have room, you might want to consider one of the "quick drain" fittings that will alleviate the overtightening/stripping problem from ham fisted mechanics!
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Old 01-10-2016, 08:02 AM   #5
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Try using a breaker bar with a suitable size cheater bar to get it off. I'm sure the fast lube did not try too hard as they did not want the liability of the threads stripping out or the plug twisting off.
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Old 01-10-2016, 08:29 AM   #6
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I would try the impact wrench first. Be sure the wrench is set on reverse, pull the trigger slowly and apply pressure to the trigger steadily. The plug should loosen then use a ratchet and socket to extract the plug. The hammering effect of the impact will aid in loosening the plug.
We run into this all too often on aluminum oil pans on cars and trucks.
I will never understand why someone thinks a drain plug should be tightened as tight as a wheel nut. You can damage the plug gasket or O ring with overtightening which will result in a leak.
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Old 01-10-2016, 08:38 AM   #7
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All that I have seen are pipe threads on the plug.........the newer ones are 6 point, and my older one is a 4 point! I put a couple of wraps of Teflon tape on it, and it comes right out next time.
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Old 01-10-2016, 08:44 AM   #8
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Quote:
Originally Posted by vsheetz View Post
On our new to us Tiffin Phaeton's 10kw diesel generator, Speedco found the oil drain plug is really tight. So much so there is concern of damaging if applying more force to remove. So they opted to leave it alone and we skipped servicing the genny.
So, now turning my attentions to removing. I figure I will soak it well with PB Blaster a couple three times over a day before next attempting removal.
Other suggestions?
Thx!
vsheetz

BTW occasionally tapping the drain plug with a hammer while it's soaked with PB Blaster may help... (it does with rusted/frozen bolts and nuts).

(Also applying heat with propane torch might help).

Mel
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Old 01-10-2016, 10:08 AM   #9
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Not sure PB Blaster will do the job. Don't forget the plug is designed to seal,so PB probably won't get past the gasket. I like the impact wrench solution. I certainly would not use a 12 point socket. Use a socket that's NOT worn. I would also grind the leading edge of my socket so it had a square leading edge. Sockets have a rounded edge to allow easy slip on ,this however sometimes prevents full engagement of the nut or bolt head. I've removed dozens of frozen oil plugs that customers buggered up trying to remove them with shabby tools. You'd be surprised how many vehicles get towed in when DIY'ers try to remove over tightened oil filters. Lots of times the tin can is shredded and only the threaded plate is left.

CLIFF
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Old 01-10-2016, 10:16 AM   #10
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Quote:
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vsheetz

BTW occasionally tapping the drain plug with a hammer while it's soaked with PB Blaster may help... (it does with rusted/frozen bolts and nuts).

(Also applying heat with propane torch might help).

Mel
'96 Safari
Dont use heat, heat expands. It works fine on nuts.
your plug is inside a hoke, it needs to shrink.
I would not try to hest the oil pan.

Dan
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Old 01-10-2016, 11:40 AM   #11
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Quote:
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Dont use heat, heat expands. It works fine on nuts.
your plug is inside a hole, it needs to shrink.
I would not try to heat the oil pan.
Dan
dpinvidic
The common procedure is:
1.) Heat the plug.
2.) Allow it cool.
3.) Remove it.
Mel
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Old 01-10-2016, 01:45 PM   #12
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Quote:
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You'd be surprised how many vehicles get towed in when DIY'ers try to remove over tightened oil filters. Lots of times the tin can is shredded and only the threaded plate is left.

CLIFF
My first oil change on my John Deere tractor I ended up ripping he can right off the filter base! I swear they must have used Super Glue on the threads at the factory! Same as these generators, why tighten the drain plug so much?
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Old 01-10-2016, 01:47 PM   #13
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Wow, I didn't think removing a simple pipe plug could draw so much attention.

This is a Tappered Thread Pipe Plug into an Aluminum housing. If it's a 6 point head on the plug, get a Good 6 point socket with a long handled ratchet or break over bar and lean into it until it snaps free. If it's a 4 point head, get a Good 8 point socket and do the same.

Forget about torches, spray goop etc. Just use good old fashioned Muscle and the right tool.
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Old 01-10-2016, 04:35 PM   #14
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Impact wrench is the only safe alternative..... Breaker bar might cause more trouble.
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