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| = 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 called "welsh plugs". See [http://www.google.com/patents/US1058210 Patent No 1058210] | + | The Welch plug was originally designed {{web|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 {{web|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 (core plugs). Those that are designed for freezing safety may be 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". | ||
Revision as of 21:37, 8 February 2023
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 |
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)
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:
- 00933-14000 PLUG-WELCH (1) head, rear [40 mm]
Engine Block
B110
Five Welch Plugs (including three on side of block)
REAR: Large core plug + smaller cam bore plug
* 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
* 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
- 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