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#4467280 - 07/22/17 04:59 PM B&S drain plug just screws in, never tightens
Variant_S Offline


Registered: 02/14/17
Posts: 27
Loc: 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

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#4467283 - 07/22/17 05:04 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
HangFire Offline


Registered: 08/21/13
Posts: 2506
Loc: 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.
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#4467285 - 07/22/17 05:06 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
spasm3 Offline


Registered: 05/30/10
Posts: 8652
Loc: North Carolina
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.
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#4467327 - 07/22/17 05:51 PM Re: B&S drain plug just screws in, never tightens [Re: HangFire]
Variant_S Offline


Registered: 02/14/17
Posts: 27
Loc: 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.

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#4467330 - 07/22/17 05:54 PM Re: B&S drain plug just screws in, never tightens [Re: spasm3]
Variant_S Offline


Registered: 02/14/17
Posts: 27
Loc: 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...

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#4467333 - 07/22/17 05:57 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: Illinois
If it's a tapered plug (or was) and has been screwed in past the wrench end then there is no taper left.
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#4467359 - 07/22/17 06:39 PM Re: B&S drain plug just screws in, never tightens [Re: SHOZ]
Variant_S Offline


Registered: 02/14/17
Posts: 27
Loc: 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.

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#4467368 - 07/22/17 06:49 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
CT8 Offline


Registered: 10/09/14
Posts: 10967
Loc: 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.
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#4467369 - 07/22/17 06:50 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
CT8 Offline


Registered: 10/09/14
Posts: 10967
Loc: 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.
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"Don't let your preconceived notions get in the way of facts."
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#4467385 - 07/22/17 06:57 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Maybe replace the pipe threaded plug with a flange bolt and a gasket.

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#4467518 - 07/22/17 09:24 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: 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

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#4467571 - 07/22/17 10:50 PM Re: B&S drain plug just screws in, never tightens [Re: SHOZ]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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.
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#4467588 - 07/22/17 11:09 PM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
wally6934 Offline


Registered: 02/18/12
Posts: 318
Loc: Wi

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#4467736 - 07/23/17 07:42 AM Re: B&S drain plug just screws in, never tightens [Re: Variant_S]
cronk Offline


Registered: 01/06/09
Posts: 1287
Loc: 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.
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#4467744 - 07/23/17 07:53 AM Re: B&S drain plug just screws in, never tightens [Re: wally6934]
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: 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.
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2008 Hyundai Accent 1.6L 5 sp manual hatchback
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