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I did a search on MGA 1600 oil gallery plugs, got lots of hits including
installation instructions. There are some plugs with heads on them,
like a bolt. One of them might work for you unless it absolutely has to
fit flush.
CR
On 9/13/2018 1:25 PM, Stan Fickes via Mgs wrote:
> I'm finishing the seemingly unending rebuild of an MGA 1600 motor, and
> am stuck with a leak. When I had a failure of a brass plug, I chose to
> replace the big plugs at the end of the long oil galleries with 1/4"
> NPT steel plugs. I tapped the bores, like I see advice for in many
> places, and installed the plugs. (I have since seen that the .505"
> bore is too large for the tapping operation, which should have started
> at 7/16", so that probably explains the leak.) I used Permatex Ultra
> Black on the plugs. Months later (did I say it seemed never-ending?) I
> installed the motor into the car and fired it up for the 20-minute cam
> installation run. It looked good at first, but after 20 minutes I have
> a foot-wide puddle of oil under the front crossmember. I pulled the
> motor back out and found the right-front plug was leaking. I removed
> the plug, then tried again using Avation Form-a-Gasket. No change to
> the leak. Tried it (from advice) with Permatex Thread Sealant with
> PTFE. The leak is slower, but still a problem. I am about to JB Weld
> the plug into place, but have concerns about its permanence. Will I be
> able to remove the plug at next rebuild, or at least have a machine
> shop do it without machining the block? Is there something else to try
> first? I have cut away the front plate to allow plug removal without
> disassembly, and am using a pre-oiler to pressurize the system so I
> don't need to R/R the motor with each attempt. It's out on a stand
> now, and will be until the leak is gone.
> Thanks!
> Stan
>
>
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I did a search on MGA 1600 oil gallery plugs, got lots of hits
including installation instructions. There are some plugs with
heads on them, like a bolt. One of them might work for you unless
it absolutely has to fit flush.<br>
<br>
CR<br>
<br>
<div class="moz-cite-prefix">On 9/13/2018 1:25 PM, Stan Fickes via
Mgs wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAK23Kv9oHmWrY9tKA3083enp4Wyfn9Cog8akm=7-_jVODX5Dfw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div dir="ltr">I'm finishing the seemingly unending rebuild of an
MGA 1600 motor, and am stuck with a leak. When I had a failure
of a brass plug, I chose to replace the big plugs at the end of
the long oil galleries with 1/4" NPT steel plugs. I tapped the
bores, like I see advice for in many places, and installed the
plugs. (I have since seen that the .505" bore is too large for
the tapping operation, which should have started at 7/16", so
that probably explains the leak.) I used Permatex Ultra Black on
the plugs. Months later (did I say it seemed never-ending?) I
installed the motor into the car and fired it up for the
20-minute cam installation run. It looked good at first, but
after 20 minutes I have a foot-wide puddle of oil under the
front crossmember. I pulled the motor back out and found the
right-front plug was leaking. I removed the plug, then tried
again using Avation Form-a-Gasket. No change to the leak. Tried
it (from advice) with Permatex Thread Sealant with PTFE. The
leak is slower, but still a problem. I am about to JB Weld the
plug into place, but have concerns about its permanence. Will I
be able to remove the plug at next rebuild, or at least have a
machine shop do it without machining the block? Is there
something else to try first? I have cut away the front plate to
allow plug removal without disassembly, and am using a pre-oiler
to pressurize the system so I don't need to R/R the motor with
each attempt. It's out on a stand now, and will be until the
leak is gone.
<div>Thanks!</div>
<div>Stan</div>
</div>
<br>
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<br>
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