Page 74 - Tech handbook 2019 rev 6 whyperlinks

• Rubber Rails: need to be inspected for any visual signs of damage or uneven wear, any oil surrounding the
rails should be cleaned and rubber rail height should be taken and noted. Height should be compared to
previous reading to confirm health and/or the need for engine shims. Note 24-hour settling is required for
new rubber rail installation. This settling requires the engine to be full of fluids with block heater operational
• Spring packs: Spring packs on both engine and gearbox should be inspected for any signs of wear, damage,
or cracking. The following step will go over proper measurements
• Hardware: All connection hardware including, nuts and bolts, alignment pins and other mechanical
connections need to be confirmed. Ensure all bolts are tight to the frame rail and torqued. Frame rails are
tight to each other and not damaged in any way. alignment pins installed and not backed out, couplings
torqued, and no physical signs of damage are seen.

Only once all items above are acceptable it is okay to move onto the next step. Skipping any one of steps
above will result in improper alignment and possible damage to the couplings, spring packs, engine or persons

Crankshaft Deflection
During the initial alignment of an engine coupling or engine overhaul, crankshaft deflection needs to be verified.
This can only be done with the engine coupling disconnected and removed. This requires a dial indicator and
mag base, shown in illustration 1b and the overhaul data sheet to be found on Penn SharePoint web page.

• With coupling removed, force crankshaft to the rear (damper) of the Block. Set your dial indicator up as
shown in illustration 1c below and zero out your reading, making sure your dial indicator has a small amount
of pressure still on the indicator arm.
• Using either the engine turning tool or prybar if engine side cover is removed move crankshaft fully to the
Front (flywheel) of the block. Note the reading down and repeat the process, if properly performed the
second time should result in the same measurement. This number is your Crank Shaft Deflection.
• If outside of spec Thrust washers must be checked

Crankshaft Deflection limits

• All Type 6 engines built 2003 or AFTER: 0.3-0.65 mm
• 612- 616 engines built 2002 or BEFORE: 0.2-0.55 mm
• 620 engines built 2002 or BEFORE: 0.7-1.00 mm

1b 1c

3 | P a ge