PRW 18 PQ Platinum Series Flexplate (SFI-Rated 29.1) - Manual

PRW Industries, Inc.
1722 Illinois Avenue
Perris, California 92571
Tele: (951) 436-7900
Tech: (888) 377-9779
PQ x
Platinum Series Flexplate Installation
Instructions
PARTS LIST
Item Quantity
Flexplate 1 each
SFI 29.1 Certification Sticker 1 each
Drain plug replacement (1/8” NPT x 5/16” L-SB & BB Ford only) 1 each
Step 1
Clean and inspect all parts (verify that the serial number on the sticker matches the SFI number engraved
on the flexplate).
Step 2
If not already completed, punch out the date on the SFI Decal and apply to the flexplate.
Step 3
Use a rubber mallet or block of wood and tap the flexplate into place onto the flange of the crankshaft.
Tap it evenly and flush upwards alongside the crankshaft flange. DO NOT draw the flexplate unto the
crank with bolts or impact wrench.
Step 4
After the flexplate has been placed onto the crankshaft, use PRW
threadlocker on the flexplate bolts and torque to OEM specifications.
To receive proper torque on the bolts, follow the torque pattern
below, use flat washers only.
Step 5
Hand turn the crankshaft to verify there is no wobble in the ring gear and to make sure it clears the
housing.
NOTES: 1) Welding weights on the flexplate for engine balancing is not recommended and voids
warranty; 2) drilling holes for balance is permissible, but not recommended; 3) high performance and
racing applications new flexplate bolts with a rating of 180,000 PSI or higher is recommended.
SPECIAL NOTE: Ford SB & BB
Stock Torque Converter – remove standard drain plug and replace with special Allen Head drain plug (PRW
PN 1800005) to preclude interference with flywheel. The use of a GM Converter may require a PRW Crank
Adapter #1800460 (PRW 18460xx Platinum Series) or #1800302 (PRW 18302xx Platinum Series).
Possible Causes for Damaged Flexplates
1. Not installing flexplate perpendicular to crankshaft flange
2. Engine or torque converter out of balance
3. Worn front pump bushing
4. Too much end play on the crank from excessive thrust bearing wear
5. Improper bolt torque and, or not in proper order according to OEM specs
6. A bad starter can wear or break off the teeth on the ring gear
7. Not properly shimming the starter, if needed, to align with the starter ring