Welch Plugs

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Categories: Engine Mechanical | Cooling System | Transmission

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Revision as of 23:35, 21 June 2016 ddgonzal (Talk | contribs) (Welch Plug moved to Welch Plugs) <- Previous diff		Revision as of 09:16, 25 September 2016 ddgonzal (Talk | contribs) Next diff ->
Line 2:		Line 2:
	= Terminology =		= Terminology =
-	The Welch plug was originally designed [http://www.britishcarweek.org/welch_plug.html circa 1910 by the Welch brothers] at the Welch Motor Car Company of Pontiac, Michigan. You may hear them incorrectly called "welsh plugs". See [http://www.google.com/patents/US1058210 Patent No 1058210]	+	The Welch plug was originally designed [http://www.britishcarweek.org/welch_plug.html circa 1910 by the Welch brothers] at the Welch Motor Car Company of Pontiac, Michigan. You may hear them called "welsh plugs". See [http://www.google.com/patents/US1058210 Patent No 1058210]
-	They are often called "freeze plugs" because if the engine coolant freezes they'll be pushed out of the casting. However, the purpose is not necessarily to solve freezing problems but rather to seal the holes left by the casting or machining process. Those that are designed for freezing safety are called "expansion plugs".	+	They are often called "freeze plugs" because if the engine coolant freezes they'll be pushed out of the casting. However, the purpose is not necessarily to solve freezing problems but rather to seal the holes left by the casting or machining process (core plugs). Those that are designed for freezing safety may be called "expansion plugs".
	= Set =		= Set =
	Sets are for the engine block only (does not include the Cylinder Head plugs).		Sets are for the engine block only (does not include the Cylinder Head plugs).
-	PLUG-WELCH	+	PLUG-WELCH A10/A12/A13/A12A/A14/A15
	44Ø CAM bore, rear		44Ø CAM bore, rear
	50Ø CORE block, rear		50Ø CORE block, rear
-	35Ø CORE (3) block, side	+	35Ø CORE block, side (3)
		+	* [[Block_Comparison#M2_Block|M2 Block]] reported uses 25mm plugs
		+
		+	Pioneer PE-130 (PE-130B contains four brass plugs for the water-contact plugs + one steel)
		+	<br>{{Album|26530}}
		+	<br>Pioneer includes front & rear oil gallery blind plugs
		+	11021-13200 PLUG-taper (12.7ø) (fixing [cam] oil gallery) (2)
	DORMAN 557-031 A12 & A13 engines		DORMAN 557-031 A12 & A13 engines
-	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/A12ampA13ENGINEEXPANSIONPLUGKIT.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/A12ampA13ENGINEEXPANSIONPLUGKIT.jpg]	+	<br>{{Photo|A12ampA13ENGINEEXPANSIONPLUGKIT.jpg}}
-	MAFCO 437 120Y 1969-1972 (http://www.mafcobell.co.uk)	+	MAFCO 437 120Y 1969-1972 (http://www.mafcobell.co.uk). MAFCO have got the name and years wrong, and one plug appears to be the wrong size
-	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Mafco437enginecoreplugset1969-1972A12.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/th_Mafco437enginecoreplugset1969-1972A12.jpg]	+	<br>{{Photo|Mafco437enginecoreplugset1969-1972A12.jpg}}
-		+
-	MAFCO 438 1972-1980	+
-	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Mafco438enginecoreplugset1972-1980A12.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/th_Mafco438enginecoreplugset1972-1980A12.jpg]	+
-		+
-	MAFCO 441 Sunny 140Y 1980-1982 (L14)	+
-	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Mafco441enginecoreplugsetB3101980-1982.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/th_Mafco441enginecoreplugsetB3101980-1982.jpg]	+
-		+
-	above may be for L14 engine???	+
-	PB210 (140Y in South Africa) - L14 engine	+
-	11021-21000 PLUG-welch [6 total, 40 mm]	+
-	* (3) right side	+
-	* (2) left side	+
-	* (1) rear	+
-	cylinder head	+
-	* 00933-13500 PLUG-welch, 35 -7410	+
-	* 00322-13000 PLUG-welch, 30 -7410	+
-	* 11048-73403 PLUG-blind (2) 7411	+
	= Cylinder Head=		= Cylinder Head=
	One Welch Plug:		One Welch Plug:
-	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=15003 http://datsun1200.com/uploads/photos/15003.jpg]	+	<br>{{Album|15003}}
-	* 00933-14000 PLUG-WELCH (1) head, rear [reportedly 40 mm]	+	* 00933-14000 PLUG-WELCH (1) head, rear [40 mm]
	= Engine Block=		= Engine Block=
	== B110 ==		== B110 ==
	Five Welch Plugs		Five Welch Plugs
-	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=15004 http://datsun1200.com/uploads/photos/15004.jpg]	+	<br>{{Album|15004}}
-	[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/n59975533yoshi_senna-img600x450-1211090038fvol0413765.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/th_n59975533yoshi_senna-img600x450-1211090038fvol0413765.jpg]	+	{{Photo|n59975533yoshi_senna-img600x450-1211090038fvol0413765.jpg}}
	* 11019-32200 PLUG-WELCH 44Ø CAM BEARING (1) block, rear (44.425 Ø) [1-3/4 inch]		* 11019-32200 PLUG-WELCH 44Ø CAM BEARING (1) block, rear (44.425 Ø) [1-3/4 inch]
	* 00933-15000 PLUG-WELCH 50Ø CORE HOLE (1) block, rear prev. 01648-00084		* 00933-15000 PLUG-WELCH 50Ø CORE HOLE (1) block, rear prev. 01648-00084
	* 00933-13500 PLUG-WELCH 35Ø CORE HOLE (3) block, right side		* 00933-13500 PLUG-WELCH 35Ø CORE HOLE (3) block, right side
-	[http://datsun1200.com/modules/myalbum/photo.php?lid=6107 http://datsun1200.com/uploads/thumbs/6107.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=6109 http://datsun1200.com/uploads/thumbs/6109.jpg]	+	{{Album|6107}} {{Album|6109}}
	* 35mm brass core-plugs		* 35mm brass core-plugs
Line 73:		Line 62:
	= Transmission =		= Transmission =
	Three Welch Plugs		Three Welch Plugs
-	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=1668 http://datsun1200.com/uploads/photos/1668.jpg]	+	<br>{{Album|1668}}
	* 00933-11400 PLUG-WELCH TRANSMISSION CASE (2) inside bell, northwest of mainshaft		* 00933-11400 PLUG-WELCH TRANSMISSION CASE (2) inside bell, northwest of mainshaft
		+	*: 14mm diameter, all 56-series and 60-series
	* 32102-18000 PLUG-WELCH TRANSMISSION CASE (1) inside bell, below mainshaft		* 32102-18000 PLUG-WELCH TRANSMISSION CASE (1) inside bell, below mainshaft
-	*: Can be seen in photo, just below throwout bearing	+
-	*: [http://datsun1200.com/modules/myalbum/photo.php?lid=6901 http://datsun1200.com/uploads/thumbs/6901.jpg]	+	The two small plugs can be seen in this photo, to the left of the spring:
		+	<br>{{Photo|TM-04_TM9.jpg|Datsun%201200/wiki/trans}}
	= Removal and installation =		= Removal and installation =
Line 84:		Line 75:
	To install, fit squarely into bore, and tap gently and evenly into place. No sealer is used.		To install, fit squarely into bore, and tap gently and evenly into place. No sealer is used.
-	[[Category:Engine Mechanical]][[Category:Cooling System]][[Category:Transmission]]	+	= Others =
		+	MAFCO 438 1972-1980
		+	<br>{{Photo|Mafco438enginecoreplugset1972-1980A12.jpg}}
		+
		+	MAFCO 441 Sunny [[140Y]] 1980-1982
		+	<br>{{Photo|Mafco441enginecoreplugsetB3101980-1982.jpg}}
		+
		+	above looks to be for L14 engine
		+	[[PB210]] (140Y in South Africa) - L14 engine
		+	11021-21000 PLUG-welch [6 total, 40 mm]
		+	* (3) right side
		+	* (2) left side
		+	* (1) rear
		+	cylinder head
		+	* 00933-13500 PLUG-welch, 35 -7410
		+	* 00322-13000 PLUG-welch, 30 -7410
		+	* 11048-73403 PLUG-blind (2) 7411
		+
		+	[[Category:Engine Mechanical]][[Category:Cooling System]][[Category:Transmission]]{{End}}

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Revision as of 09:16, 25 September 2016

Welch plugs (core plugs) are circular discs that fit into, and seal the casting and machining holes in the Engine block, Cylinder Head and Transmission.

Contents 1 Terminology 2 Set 3 Cylinder Head 4 Engine Block 4.1 B110 4.2 B120 5 Transmission 6 Removal and installation 7 Others

Terminology

The Welch plug was originally designed circa 1910 by the Welch brothers at the Welch Motor Car Company of Pontiac, Michigan. You may hear them called "welsh plugs". See Patent No 1058210

They are often called "freeze plugs" because if the engine coolant freezes they'll be pushed out of the casting. However, the purpose is not necessarily to solve freezing problems but rather to seal the holes left by the casting or machining process (core plugs). Those that are designed for freezing safety may be called "expansion plugs".

Set

Sets are for the engine block only (does not include the Cylinder Head plugs).

PLUG-WELCH A10/A12/A13/A12A/A14/A15
44Ø CAM bore, rear
50Ø CORE block, rear
35Ø CORE block, side (3)
* M2 Block reported uses 25mm plugs

Pioneer PE-130 (PE-130B contains four brass plugs for the water-contact plugs + one steel)
Album 26530
Pioneer includes front & rear oil gallery blind plugs

11021-13200 PLUG-taper (12.7ø) (fixing [cam] oil gallery) (2)

DORMAN 557-031 A12 & A13 engines

MAFCO 437 120Y 1969-1972 (http://www.mafcobell.co.uk). MAFCO have got the name and years wrong, and one plug appears to be the wrong size

Cylinder Head

One Welch Plug:
Album 15003

• 00933-14000 PLUG-WELCH (1) head, rear [40 mm]

Engine Block

B110

Five Welch Plugs
Album 15004

* 11019-32200 PLUG-WELCH 44Ø CAM BEARING (1) block, rear (44.425 Ø) [1-3/4 inch]
* 00933-15000 PLUG-WELCH 50Ø CORE HOLE (1) block, rear prev. 01648-00084

* 00933-13500 PLUG-WELCH 35Ø CORE HOLE (3) block, right side 
Album 6107 Album 6109
* 35mm brass core-plugs

B120

35 mm Expansion Plug 00933-13500/11021-E3000/00933-1351A
Nominal Dia.: 35.21mm
Steel
Height: 0.380"

プラグ (35mm - 3 required)
7510-8506 00933-13500
8506-8706 11021-E3000 [11021E]
8706-     00933-1351A

Cam bore plug
11019-32200 44 mm -8506
01648-00191       8506-

Transmission

Three Welch Plugs
Album 1668

• 00933-11400 PLUG-WELCH TRANSMISSION CASE (2) inside bell, northwest of mainshaft

  14mm diameter, all 56-series and 60-series

• 32102-18000 PLUG-WELCH TRANSMISSION CASE (1) inside bell, below mainshaft

The two small plugs can be seen in this photo, to the left of the spring:

Removal and installation

Removal: tap one edge with a punch or chisel, then grab it with vice-grips and wiggle it out.

To install, fit squarely into bore, and tap gently and evenly into place. No sealer is used.

Others

MAFCO 438 1972-1980

MAFCO 441 Sunny 140Y 1980-1982

above looks to be for L14 engine
PB210 (140Y in South Africa) - L14 engine
11021-21000 PLUG-welch [6 total, 40 mm]
* (3) right side
* (2) left side
* (1) rear
cylinder head
* 00933-13500 PLUG-welch, 35 -7410
* 00322-13000 PLUG-welch, 30 -7410
* 11048-73403 PLUG-blind (2) 7411 

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