[E-Type] Large engine plug

E-Type
1

When the engine was out for a rebore I asked the shop to
remove the large threaded (heater) plug on the side of the
block to clean out any crud.

Parts book says C5022 fits as a replacement - however thread
needs to be cleared so I need to purchase a tap.

Book says 1’’ Briggs? (ASNI / Nation pipe thread )

What do I purchase and should it be a tapered fit.–
dtype
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2

In reply to a message from dtype sent Mon 7 Apr 2014:

Do you have a name?

Get in touch with coventry west, 1 800 331-2193

They rebuild engines etc.
Walter–
The original message included these comments:

When the engine was out for a rebore I asked the shop to
remove the large threaded (heater) plug on the side of the
block to clean out any crud.

–
Walter Schuster 78XJ6 FI Ser.II
Albuquerque/New Mexico, United States
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3

In reply to a message from dtype sent Mon 7 Apr 2014:

If you are talking about the large plug, it is British Pipe
Thread, not a tapered thread. There is a copper ‘O’ ring
that seals it. The actual bushing (part #C29037) that was
used in conjunction with the block heater element is what
would otherwise be put in the hole, along with a heating
element. Those bushings are unobtainable, but I have one on
my XJ and another waiting to go in one of my E-types.–
Tom Hishon, 69 E-type 2+2, 69 E-type OTS, 85 XJ6, '03 X-type
Wasilla, Alaska, United States
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4

In reply to a message from dtype sent Mon 7 Apr 2014:

dtype (we prefer to use names on this forum),

What series E-type are you referring to? It could impact the
answer.

There appears to be some opportunity for confusion in this
area, given the information I found when researching the
same topic a while ago. The Jaguar parts lists for Series 1
3.8, Series 1 4.2, and Series 2 engines all show C.5022 (1’’
Briggs). None of them reference a sealing washer. This is
consistent with the plug have a tapered thread. As I
understand it, the Briggs standard is a tapered thread, but
is an American standard, so I am rather surprised that
Jaguar would have use it instead of BSP tapered. Perhaps,
they had to use an existing north american block heater,
which already had this thread type. If the thread is indeed
a Briggs thread, you will need a Briggs tap. It has 11.5
TPI.

Interestingly, if you look at the XKs Unlimited catalog,
they show a plug C.32276, with a copper sealing washer
C.2296/16. This plug is quoted by many other vendors
(including in the UK where I believe you are located), but
for later XJ6 engines. It is always quoted with a copper
sealing washer, so I assume that the plug in this case has a
parallel pipe thread - possibly BSPP. Maybe the practice by
some engine rebuild shops is to replace the Briggs plug with
the parallel thread plug and sealing washer when they
rebuild an early engine?

So, if your plug had a sealing washer I would question
whether it is really a 1’’ Briggs thread. If not, you need to
find a 1’’ Briggs tap (good luck), or see what you can do
with a pick.

-David–
http://tinyurl.com/b4fdupp XK140MC OTS, S2 XKE OTS, XK8 OTS
Monterey CA, United States
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5

In reply to a message from davidxk sent Mon 7 Apr 2014:

I think that

a) the early ones are a deep brass plug. It goes into the
hole and has NO surround on the outside to compress any kind
of seal. It just sits inside and is VERY VERY tight. I had
to kill mine to remove it. Darn.

b) the later ones are a proper plug, like a short screw.
Proper thread and head and thus a copper seal ring which is
compressed.

Thats all…

Carsten–
Restoration in progress: 1966 2+2 LHD manual
Goettingen, Germany
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6

In reply to a message from davidxk sent Mon 7 Apr 2014:

Interesting. The block heater (which I have) is indeed 1
inch NPT tapered. However, the block on my S1 is parallel
thread, close to the diameter and pitch of 1 1/4 inch BSPP.

I also have the Jaguar adapter bushing that has external
BSPP threads and internal NPT threads. Perhaps Jaguar did
prepare earlier blocks to accept the block heater directly.

Tom Hishon, who posted earlier in this thread might clarify.
I happen to know that the bushing he intends to fit to his
E-type is identical to my XJ6 bushing. Tom, have you tried
yet to see if it fits? If it does, the block is not
prepared for 1 inch NPT but for a larger BSPP plug.–
The original message included these comments:

same topic a while ago. The Jaguar parts lists for Series 1
3.8, Series 1 4.2, and Series 2 engines all show C.5022 (1’’
Briggs). None of them reference a sealing washer. This is
consistent with the plug have a tapered thread. As I
understand it, the Briggs standard is a tapered thread, but
is an American standard, so I am rather surprised that
Jaguar would have use it instead of BSP tapered. Perhaps,
they had to use an existing north american block heater,
which already had this thread type. If the thread is indeed

–
Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
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7

In reply to a message from Robert Wilkinson sent Mon 7 Apr 2014:

OK. I think the more is beginning to clear, if only a
little. From Bob’s comments, it would appear that the
‘‘Brigg’s’’ Standard thread as referenced in the E-Type Part’s
Books is what is now commonly referred to as NPT - the most
common pipe thread here in the US. This is good news, as
finding a 1’’ NPT tap may not be too hard, even in the UK?

Bob, when you refer to ‘‘the block on my S1’’, are you
referring to an XJ6 S1 or an E-Type S1? To be consistent
with what I found in the docs, I am hoping you meant XJ6 S1.
If this is the case, then it would seem that all the 6-
cylinder E-Type blocks use the 1’’ NPT tapered plugs, while
the later XJ6 blocks have a larger parallel pipe thread plug

  • possibly 1 1/4’’ BSPP.

-David–
The original message included these comments:

inch NPT tapered. However, the block on my S1 is parallel

–
http://tinyurl.com/b4fdupp XK140MC OTS, S2 XKE OTS, XK8 OTS
Monterey CA, United States
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8

In reply to a message from davidxk sent Mon 7 Apr 2014:

You are correct, David. I was referring to my 73
XJ6–indicated on my signature line. Hopefully Tom H. will
chime in…he should be able to look at the plug in his
E-type and compare it to the XJ6 BSPP plug that he intends
to replace it with.–
The original message included these comments:

Bob, when you refer to ‘‘the block on my S1’’, are you
referring to an XJ6 S1 or an E-Type S1? To be consistent

–
Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
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9

In reply to a message from Robert Wilkinson sent Mon 7 Apr 2014:

I just went out to the garage to check my SII 4.2L engine in
my OTS. The large plug on the right side of the block is the
same size, and ‘lipped’ to apparently use a copper ring,
just like the 4.2L XJ engines in my other E-type and my XJ6.
There is one difference between the SII E-type plug and the
XJ engine plug(s). The plug from the 1969 block has a
recessed hexagonal for a large allen type wrench/key. The
plug for the later 1980’s engine blocks use a raised
hexagonal area to put a socket on when turning it. I imagine
the British pipe thread (non tapered) are the same, with the
only apparent difference is that one is an ‘inny’ and the
other style is an ‘outie’. The Bushing for the block heater
is as Bob describes. Bob: the bushing you sent is a perfect
fit, but I had to have the 1-inch pipe thread for the
heating element enlarged a little bit.–
Tom Hishon, 69 E-type 2+2, 69 E-type OTS, 85 XJ6, '03 X-type
Wasilla, Alaska, United States
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10

In reply to a message from kassaq sent Tue 8 Apr 2014:

Thanks Tom for that data point. Assuming the engine block in
your ‘69 OTS is original, this means that the changeover
from the tapered 1’’ NPT thread (for plug C5022) to the later
parallel thread (possibly 1 1/4’’ BSPP) thread (for plug
C32276) is within the lifetime of the Series 2 E-Types. The
original block in my '69 OTS (7R2779-9) has a plug similar
to that you described. It has a hex ‘‘inny’’, and appears to
have a lip behind which is probably a sealing ring. There is
certainly no exposed thread on the plug, which you would
expect to see with a tapered thread. So, to go back to the
original poster’s question, it seems that we can’t help
unless he/she tells us what model E-Type he/she has, and if
it’s a Series 2, the answer may depend on his exact engine
number…

-David–
http://tinyurl.com/b4fdupp XK140MC OTS, S2 XKE OTS, XK8 OTS
Monterey CA, United States
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