Specifications

RotorWay International
Exec 162F Maintenance Manual
24
D. Place the pulley end of the shaft in a soft jaw vise. Using a belt wrench or appropriate tool, turn the impeller
counter clockwise to remove it from the shaft. BEFORE REMOVING THE IMPELLER, NOTE HOW THE SEAL IS
INSTALLED SO THAT THE REPLACEMENT CAN BE REINSTALLED IN AN IDENTICAL MANNER. Be careful
not to damage the impeller or shaft. (A bolt may be inserted into the pulley bolt hole of the shaft to help keep the
shaft from rotating.)
E. Determine if the bearings need replacement by checking the smoothness of operation and the side-end play. Also
examine the condition of the shaft itself checking for excessive corrosion or other damage. The shaft and bearings
are an assembly and are replaced as such. If you determine the shaft assembly to be bad, it must be replaced
using water pump shaft and bearing, part no. E29-2100. Before removing the shaft, measure the distance from
the “face” of the water pump body to the end of the shaft where the impeller “bottoms” when installed. Record this
number for use when installing the replacement shaft assembly. Proceed to step F below if the shaft assembly is
to be replaced. If the shaft assembly appears to be in good condition, proceed to step H.
F. Place the water pump body in an oven and heat to 250-275 degrees F. CAUTION: DO NOT EXCEED 300
DEGREES F. Remove the water pump body and place it on a surface where the shaft assembly can be pressed
out of the casting. Do not use excessive force as it could damage or crack the aluminum casting. (The seal will be
pressed out with the shaft assembly.)
G. Install the new shaft assembly by first cleaning the water pump body thoroughly. Pre-coat the bearing O.D. and
the body I.D. with a light film of Anti-seize. The shaft must be reinstalled by using light pressure ONLY. You will
need to fabricate a bushing which allows you to press ONLY on the outer race of the bearing. Do not install by
pressing on the shaft itself. Press the shaft assembly in until the height dimension recorded in step F is matched.
Proceed to step I.
H. Using fine emery cloth or equivalent, sand and deburr the shaft eliminating any corrosion and burrs. Hold the
water pump body in a vise and carefully tap out the seal assembly using a punch and hammer. (Be careful not to
damage the shaft or water pump body.)
I. Before installing the new seal (part no. E29-1150), thoroughly clean the shaft and water pump body. Put a light
coat of silicone on the seal surface which will contact the body. Install the seal until the outer flange of the seal
bottoms and sets flat. Wipe off excess silicone.
J. The shaft, seat counter bore, and rubber members of the seat should be lubricated with a light oil or grease.
Check seal surfaces to be sure they are free of any dirt or grit. CAUTION: Do not damage seal contact surfaces.
K. Carefully position and align the two mating seal pieces.
L. Fill the threads of the impeller with silicone. Screw the impeller on clockwise until tight; check for proper alignment
of the seal during this process. It must remain centered on the shaft as the impeller is installed. Using a belt
wrench, tighten the impeller and wipe off any excess silicone. (Be careful not to damage or scratch the impeller.)
M. Place a new gasket (part no. E29-1140) on the body and install the impeller housing using four bolts only. Fabricate
a shim by cutting and bending a strip of shim stock to measure the clearance between the impeller and impeller
housing. This clearance should be .015" to .025". If the clearance is out of tolerance, special thickness gaskets
are available to achieve the proper clearance. Call a factory service representative for assistance. NOTE: Have
current gasket thickness and the assembled impeller clearance measurements at hand when you call.
N. Prior to installing the remaining three bolts, apply a coating of silicone to the threads, then install and torque to
120 in. lbs. Remove the four bolts initially installed for taking the clearance measurement and reinstall them using
the same procedure as used on the last three bolts.
O. Install the water pump pulley and tighten the bolt.
P. Install the water pump assembly. Refer to the Construction Manual for installation details.
Q. Install water pump/alternator belt.
3. Replace the thermostat, engine coolant, and hose clamps when changing the hoses. CAUTION: Use ONLY a RotorWay
supplied thermostat for replacement. The correct type of thermostat was determined after many hours of testing at
the factory. Use of the wrong thermostat could damage the engine and cooling system.