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B&S drain plug just screws in, never tightens #4467280
07/22/17 03:59 PM
07/22/17 03:59 PM
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Variant_S Offline OP
Variant_S  Offline OP
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Hi all,

Long time lurker here. Apologies if this has been covered before. If so, please post a link to the thread.

I've got a drain plug on a 6 HP B&S engine that just won't tighten. It has no resistance at all. I screw it in with my fingers and it never stops. I could easily screw it in all the way until it plunks into the oil pan. The plug has no shoulder on it, just a recessed 3/8" drive opening.

I don't recall this being a problem on previous oil changes on this engine, though it's been a few years since the last one.

Should I replace the plug, or can I use something like Loctite Blue 242? And how far should it be screwed in? I'm guessing at flush with the bottom of the block.

Engine model #: 12Q802-0202-B1. Date code: 02120259. I've owned it since new.

Suggestions graciously accepted

Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467283
07/22/17 04:04 PM
07/22/17 04:04 PM
Joined: Aug 2013
Posts: 2,653
Central Maryland
HangFire Offline
HangFire  Offline
Joined: Aug 2013
Posts: 2,653
Central Maryland
Find a standard hex head bolt with the same threads. See if that is loose as well. If not, just use the bolt. If it's too long, screw a nut all the way down on it, cut off the excess, then screw the nut off. The nut will clean up the threads on the way off.

You can get the plug some grip by GENTLY peening the threads with a small hammer. That'll help it stay put but it won't do anything for leaking. You'll still need some sealant and/or lok-tite.


Various musings: http://hangfire.net
Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467285
07/22/17 04:06 PM
07/22/17 04:06 PM
Joined: May 2010
Posts: 9,459
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,459
out there
What is the plug made of? I might be tempted to buy another one if its steel. Weld a slightly larger washer to the back of the plug.


13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: B&S drain plug just screws in, never tightens [Re: HangFire] #4467327
07/22/17 04:51 PM
07/22/17 04:51 PM
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Variant_S Offline OP
Variant_S  Offline OP
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Originally Posted By: HangFire
Find a standard hex head bolt with the same threads. See if that is loose as well. If not, just use the bolt. If it's too long, screw a nut all the way down on it, cut off the excess, then screw the nut off. The nut will clean up the threads on the way off.

Good suggestion. I've shortened bolts this way before. Thanks for the reminder.

Re: B&S drain plug just screws in, never tightens [Re: spasm3] #4467330
07/22/17 04:54 PM
07/22/17 04:54 PM
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Variant_S Offline OP
Variant_S  Offline OP
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Originally Posted By: spasm3
What is the plug made of? I might be tempted to buy another one if its steel. Weld a slightly larger washer to the back of the plug.

I've no idea, but I suspect that the plug is some sort of steel. Trying a new plug is probably cheaper and faster than learning how to weld...

Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467333
07/22/17 04:57 PM
07/22/17 04:57 PM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
If it's a tapered plug (or was) and has been screwed in past the wrench end then there is no taper left.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: B&S drain plug just screws in, never tightens [Re: SHOZ] #4467359
07/22/17 05:39 PM
07/22/17 05:39 PM
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Variant_S Offline OP
Variant_S  Offline OP
Joined: Feb 2017
Posts: 51
SW of Chicago, IL
Quote:
If it's a tapered plug (or was) and has been screwed in past the wrench end then there is no taper left.

Huh. Yeah, that makes sense. If the loss of taper is just on the plug and not also on the threads in the case, then it should be an easy fix.

Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467368
07/22/17 05:49 PM
07/22/17 05:49 PM
Joined: Oct 2014
Posts: 12,557
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,557
Idaho
The plug or the block is stripped, after repair tip the lawn mower on its side to drain the oil out of the fill hole.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467369
07/22/17 05:50 PM
07/22/17 05:50 PM
Joined: Oct 2014
Posts: 12,557
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,557
Idaho
The plug or the block is stripped, after repair tip the lawn mower on its side to drain the oil out of the fill hole.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467385
07/22/17 05:57 PM
07/22/17 05:57 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Maybe replace the pipe threaded plug with a flange bolt and a gasket.

Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467518
07/22/17 08:24 PM
07/22/17 08:24 PM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
If it's a straight thread on the bolt then it needs a sealing gasket of some sort.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: B&S drain plug just screws in, never tightens [Re: SHOZ] #4467571
07/22/17 09:50 PM
07/22/17 09:50 PM
Joined: Dec 2016
Posts: 7,117
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,117
Waco, TX
Originally Posted By: SHOZ
If it's a tapered plug (or was) and has been screwed in past the wrench end then there is no taper left.


Most likely.

A reducer bushing can be epoxied into the VERY clean and well-degreased threads, then you'd have the next size smaller thread plug.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467588
07/22/17 10:09 PM
07/22/17 10:09 PM
Joined: Feb 2012
Posts: 318
Wi
wally6934 Offline
wally6934  Offline
Joined: Feb 2012
Posts: 318
Wi

Re: B&S drain plug just screws in, never tightens [Re: Variant_S] #4467736
07/23/17 06:42 AM
07/23/17 06:42 AM
Joined: Jan 2009
Posts: 1,324
Watertown, New York
cronk Offline
cronk  Offline
Joined: Jan 2009
Posts: 1,324
Watertown, New York
That plug is a tapered "pipe thread". the threads are slightly smaller on the end and taper slightly larger towards the end with the square drive.
The block is tapped the same way to work with this plug.


Unfortunately, you have a steel pipe plug going into an aluminum block, so if it has been over tightened, it more than likely ruined the threads in the aluminum block.
You could try a new drain plug, but I doubt the steel plug was damaged before the aluminum threads in the block.
You don't have to go nuts tightening these, just snug it with a 3/8 ratchet.

If you can find a reducing fitting at a hardware or plumbing supply store that might work, then you can just use a smaller drain plug inside the bushing.


2008 Ford F350
2003 Chevy Cavalier
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!
Re: B&S drain plug just screws in, never tightens [Re: wally6934] #4467744
07/23/17 06:53 AM
07/23/17 06:53 AM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
Originally Posted By: wally6934
That is a straight thread. Maybe tap it for the next size up? Going metric or sae whatever is the opposite of what it was can get you some in between sizes but the threads still need cut.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
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