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MEASURING INSERT LENGTH
To measure correctly for the length of insert you need for your application. Measure from under the spark plug (Washer) or (middle of taper for tapered seat) to the last thread. (Not to the end of the electrode). This will give you the correct length. TIME-SERT inserts cannot be shortened.
(click here for measurement)
thread repair kit
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p/n 4412 |
p/n 4412E |
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WASHER SEAT
SPARK PLUG
INSERTS
copper plated |
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TAPER SEAT
SPARK PLUG
INSERTS
silver plated |
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| Installation instructions |
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LENGTH |
Washer seat
PART NO. |
LENGTH |

Taper seat
PART NO. |
KIT SIZE |
Part No. |
INCHES |
METRIC |
INCHES |
METRIC |
|
0142SP |
.180 |
04.57mm |
01421 |
----- |
----- |
-----
|
|
4010 |
.360
.600 |
09.0 mm 15.0 mm |
40101
40103 |
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----- |
-----
----- |
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KIT SIZE |
Part No. |
INCHES |
METRIC |
Washer seat
PART NO. |
INCHES |
METRIC |
Taper seat
PART NO. |
|
4212 |
.360
.600
.690 |
09.0 mm 15.0 mm 17.5 mm |
42121
42123
42125 |
.827 |
21.0 mm |
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4212E
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|
4212H |
KIT SIZE |
Part No. |
INCHES |
METRIC |
Washer seat
PART NO. |
INCHES |
METRIC |
Taper seat
PART NO. |
|
4412
|
.270
.320
.370
.430
.530
.600
.660
.905 |
07.0 mm
08.0 mm
09.4 mm 11.0 mm
13.5 mm
15.0 mm
16.8 mm
23.0 mm |
44121
44123
44125
44127
44113
44129
44111
44112 |
.270
.400
.620
.660
.950 |
07.0 mm
10.0 mm
15.7 mm
16.8 mm
24.0 mm |
44181
44183
44185
44186
44187 |
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4412E
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Sealer required
for all taper seat
inserts p/n 6020 |
M14x1.25 Inserts are also available in aluminum click here: normally used in racing applications,
where Nitromethane is used as a fuel. Steel inserts typically have a higher tensile strength than aluminum. |
KIT SIZE |
Part No. |
INCHES |
METRIC |
Washer seat
PART NO. |
INCHES |
METRIC |
Taper seat
PART NO. |
M18x1.5 |
4815 |
.400
.720 |
10.0 mm
18.3 mm |
48151
48153 |
.400 |
10.0 mm |
48181 |
KIT SIZE |
Part No. |
INCHES |
METRIC |
Washer seat
PART NO. |
INCHES |
METRIC |
Taper seat
PART NO. |
7/8 - 18 |
4718 |
.430
.780
1.000
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11.0 mm
20.0 mm
25.4 mm |
47181
47183
47185
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stripped spark plug threads stripped out repair, sparkplug thread stripped out spark plug thread repair.
SPECIAL SEAT CUTTERS
For use on some taper seat spark plug repairs that have very limited access to the spark plug hole.
Cutter diameter .650 inches
This tool only creates the inner countersink.
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SEAT CUTTER GUIDE
M14x1.25 SPARK PLUG
For use when the step tap cannot be threaded deep enough through the spark plug hole to allow use of the seat cutter. Used in small head repair.
(e.g Lawn mower heads)
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SEALER
FOR HIGH TEMPERATURES
This sealer must be used when installing taper seat inserts. |
INSERT
DRIVER OIL
This oil is superior for installing inserts. |
KIT SIZE |
PART NO. |
PART NO. |
PART NO. |
PART NO. |
M14x1.25
Extended Ver |
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M18x1.5 |
48196 |
sparkplug flew out plug threads popped plug came out cross threaded cross |
| sparkplug flew out cross jumped out flew plug threads popped plug cross threaded came out |
M14x1.25 SEAT RECONDITION KITS |
SPECIAL CUTTERS |
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Tooling used to recondition washer seat or taper seat sealing surface.
THIS IS FOR HOLES THAT
DO NOT HAVE AN INSERT.
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If you have kit p/n 4412
or
4412E
you only need the
special individual
Recondition Seat Cutter. |
WASHER
SEAT
KIT
P/n 4412SRW
instructions
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TAPER
SEAT
KIT
P/n 4412SRT
instructions
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INDIVIDUAL
RECONDITION
WASHER SEAT CUTTER
P/n 44197 |

INDIVIDUAL
RECONDITION
TAPER SEAT
CUTTER
P/n 44198 |
spark plug hread stripping out thread stripping spark plug popped out
thread striped popping out, plug pop out spark plug popped out.
popping out plug popping spark plug came out popped out,harley davidson, harley-davidson.
Rolls Royce,Bentley,Lexus,Hyundai,Honda,Mazda,Ford,Dodge,Volkswagen,Lamborghini,Jaguar
,Rover,Audi,Mitsubishi,Toyota,Alfa-Romeo,Mercedes-Benz,Lotus,Citroen, mini cooper,
Land Rover,Renault,Oltcit,Porsche,Ferrari,AstonMartin,Vauxhall,Daewoo,Skoda,Daihatsu,
SAAB,Isuzu,Suzuki,Honda,Nissan,Peugeot,Volvo,Fiat,Subaru,BMW,KIA,Morgan,GM,Chevy,Allard
,Alvis,Austin and Morris,Austin Healey,Bristol,Bugatti,Buick,Cadillac,Chevrolet,Cisitalia,Daimler,
Datsun,Dodge,Edsel,Facel Vega,Gordon Keeble,Iso,Jensen,Lagonda,Lancia,Lincoln,Maserati,NSU
,Oldsmobile ,Panhard,Pegaso, Reliant,Riley,Sunbeam,Tatra,Triumph,TVR,Wolseley cross threaded cross
kawasaki,suziki,yamaha,buell,motorcycle,automotive. won't screw in won't go in wont tighten cross thread
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