IMT Diamond Air DA435ELW, Service Manual, Page: 18 / 24

DA435ELW: 99900917: 5-2 19970508
11. Slide the cylinder down until it mates with the
crankcase. Start all cylinder mounting bolts, until
they are snug. Torque the bolts to 180 in-lbs in the
sequence shown. Do not torque to the full 180 in-
lbs all at once. Torque in 25-50 in-lb increments.
NOTE
NO GASKET SEALER IS TO BE USED ON IMT REED
VALVE COMPRESSOR GASKETS.
12. Position the gaskets and valve plate on top of the
cylinder. Position the head on thecylinder and turn
studs finger tight.
NOTE
INSTALL THE REED VALVE PLATE WITH THE IMT
LOGO UP AND WORD “EXHAUST” TOWARD THE
PULSATION TANK.
NOTE
TO THIS POINT, STUDS SHOULD STILL BE FINGER
TIGHT AND NUTS INSTALLED ON STUDS.
13. Push the heads up toward each other and tighten
center two nuts on each head to 140 in-lbs (12 ft-
lbs).
14. Torque the remaining nuts to 140 in-lbs (15 ft-
lbs) per Figure E-2.
15. Install new “O” rings between heads and
pulsation tank.
16. Set pulsation tank into place and finger tighten
bolts.
17. Cross tighten the pulsation tank to 180 in-lbs (15
ft-lbs).
18. Torque per Figure E-2, all head nuts to 240 in-
lbs (15 ft-lbs) plus or minus 10 in-lbs, in 25-40 lb
increments.
19. Re-torque after 15 or 20 minutes have passed,
per Figure E-2, all head nuts to rating above.
NOTE
YOU MUST DOUBLE CHECK THE TORQUE OF
EVERY NUT AND BOLT.
20. Install the compressor, connect the wiring and
the air lines.
21. Be sure all tools, welder parts, or anything else
loose are removed from compressor before startup.
Follow startup procedures listed in owners manual.
Test the unit.
CAUTION
REMOVE FINGERS FROM FAN AREA.
22. After 10 hours of operation, wait for unit to
cool and re-torque all head bolts to
recommended torque shown in Figure E-2.
NOTE
IF PRESSURE FAILS TO BUILD AND THE
COMPRESSOR IS EXCESSIVELY NOISY, CHECK
THE VALVE PLATE. IT MAY HAVE BEEN INSTALLED
UPSIDE DOWN.
5-3. OIL PUMP REPLACEMENT
1. Remove the existing oil pump cover by
removing four 5/16" machine head cap screws. A
spring behind the oil pump will push the pump
partially out as these screws are loosened.
NOTE
BE CERTAIN TO NOTE THE LOCATION OF THE OIL
PORT HOLE IN BOTH THE GASKET AND THE
COVER. IT IS IMPORTANT THEY ARE ALIGNED
WITH THE PORT ON THE CRANKCASE (BOTTOM)
FOR RE-ASSEMBLY.
2. With a single edged razor blade, or sharp putty
knife, remove the old gasket material. Take care
not to damage the machined surfaces.
3. Remove the oil pump so you are able to see
inside the rear bearing housing to locate the drive
pin. The drive pin should be protruding from the
drive collar approximately 1/8".
NOTE
THE NOTCH IN THE OUTSIDE (ROTOR) OF THE
PUMP MUST FIT AROUND THIS PIN DURING
ASSEMBLY. IF NOT, THE PIN AND/OR PUMP WILL
BE DAMAGED WHEN THE CAP SCREWS ARE
TIGHTENED.
4. Using a marker, mark the location of the pin on
outside of bearing housing. Doing so will assist in
alignment of parts at re-assembly. Make certain the
crankshaft is not turned after this step.