BIG-SERT® OVERSIZED
SPARK PLUG THREAD REPAIR KIT M14x1.25
” OVERSIZED HOLES” For Spark plugs that have been previously repaired.
The stripped hole should not be larger than 16.8mm or .660 inches.
Note: Kits 5141S & 5141E can install any insert length in the columns to the right. Washer seat or taper seat
Spark plug thread repair kit P/n 5141S
5141S DOES NOT INCLUDE INSERTS
BIG-SERT SPARK PLUG KITS
KIT PART NO.
INSERTS
KITS
P/N
LENGTH
INCHES METRIC
WASHER SEAT P/N
TAPER SEAT P/N
M14x1.25
Short Version
p/n 5141S
does not include inserts.
——————————-
M14x1.25
Extended Version
p/n 5141E
does not include inserts.
Used in recessed holes 6″ inches/152mm or deeper.
.370 9.4mm
.430 11mm
.600 15mm
.660 16.8mm
.905 20mm
.965 24.5mm
51401
51403
51405
51407
51409
——-
51453
51455
51457
——-
51469
KITS THAT INCLUDE INSERTS
QTY.
LENGTH
INCHES METRIC
INSERT PART NO.
INVISIBLE TXT
Qty 1—>
Qty 2—>
Qty 1—>
INVISIBLE TXT
Qty 1 —>
Qty 2—>
Qty 1—>
Inches Metric
.370 9.4mm
.660 16.8mm
.905 23.mm
Total 8 inserts included
.430 11mm
.660 16.8mm
.965 24.5mm
WASHER SEAT P/N
51401
51407
51409
TAPER SEAT P/N
51453
51457
51459
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.
Ford spark plug kit
KIT PART NO.
LENGTH
INCHES METRIC
STYLE
TAPER SEAT P/N
Using Ford kit p/n 5553 to repair other vehicles / inserts. click here:
TRIPLE OVERSIZED SPARK PLUG REPAIR KIT M14x1.25
Repairs holes from 17mm to 18.5mm or (.670 inches) to (.730 inches)
( not recommended for virgin holes. ) use 5553 kit above
LAST CHANCE REPAIR FOR THE FORD 4.6 / 5.4 heads.
All the tools are included to repair the spark plug hole.
The kit will repair holes as large as .730 inches or 18.5mm by installing a special oversized insert
that will accept our 3/4 reach TAPER SEAT M14x1.25 BIG-SERT insert 51457.
M14x1.25
REDUCER
FORD HEADS
KIT PART NO.
LENGTH
INCHES METRIC
STYLE
.660 16.8mm
.590 15.0
Inner insert P/n 51457
Outter insert P/n 55522
We can now repair holes as large as .730 inches or 18.5mm by installing an insert inside an insert.