PRW 17 PRW Billet Steel Main Bearing Cap - Manual

PRW Industries, Inc.
1722 Illinois Avenue
Perris, California 92571
Tele: (951) 436-7900
Tech: (888) 377-9779
Installation Instructions for
PRW Billet Steel Main Bearing Caps
PARTS LIST
Item Quantity
Billet Steel Main Bearing Caps 3 each
High Strength Threadlocker, Red 1 2m bullet
Installation Instructions for Straight Replacement Main Caps
Step 1
Lubricate the main cap bolts with clean motor oil.
Step 2
Use a bottoming tap and clean up all main bolt holes in the block. Each hole should also be checked to ensure against the
possibility of the bolt bottoming out. An incorrect torque reading will result if a bolt has this problem.
Step 3
Remove all deposits, burrs, and imperfections from both the block and PRW main caps.
Step 4
Put the main caps into place on the block.
Step 5
Install and hand tighten all bolts. Then begin to torque the inside bolts only, working from the center of the block towards
the ends. Next, torque the outside bolts, working from the center towards the ends.
Step 6
Now, the block is ready to be “align bored”. On the first pass, align bore the block with a rough cut to 0.010” under the
finished size. On the second pass bore to size. Align honing may not be needed if the boring can get close enough to size.
This will be determined after your boring is done.
Step 7
De-bur and clean up.
Installation Instructions for Angled and Stepped Main Caps
Step 1
Lubricate the main cap bolts with clean motor oil.
Step 2
Measure the #2, #3, & #4 registers on the block. If the registers are not square, they must be squared by milling. Take the
largest of the six readings and mill the other five registers to that meet that measurement.
Step 3
Now measure the register depths from the block to get the register depth for the main caps. The register depths of the caps
should have between 0.001” and 0.003” more depth than the block. This clearance is critical, as this small gap gives the
main caps their bite, and stops them from walking during operation. If the clearance is any larger than 0.003”, this gap