Main Belt Replacement Instructions Rev1

Step#1 Reduce belt tension at all-thread (1/2” wrench) clevis adjuster.

Step#2 Disconnect torque link from engine case (stbd side)

Step#3 Place hydraulic jack under lower engine mount.

Step#4 Place 6X4 wood block on jack. Block should fit through header pipes (cut to length)

Step#5 Block should allow access to the three bolts on lower engine mount (adjust as necessary)

Step#6 Remove the two clevis to cup slider bolts. Allow the cup to fall into the top engine pulley.

Step#7 Lower the engine (using jack) approximately 1/4-3/8”.

Step#8 Twist top engine belt flat and slip through space between clevis and cup. You can rotate cup to facilitate if required.

Step#9 Work next and subsequent belts up through same gap. Lower engine more if necessary

Note: Allow enough space to prevent gouging the belts during removal.

Step#10 Index mark fan to fan pulley. Remove fan bolts and allow fan to lay on radiator.

Note: Many owners cut a 4” access hole on the left side of the fan shroud with a metal cover.

Step#11 Mark lower secondary bearing mounting flange (L & R) position on square tube.

Step#12 Remove flange to square tube nuts (depends on how builder installed bolts)

Note: Sometimes it is necessary to disconnect clutch arm to facilitate belt removal.

Step#13 Move (carefully) flange assembly aft away from square tube enough to slip belts between flange and square tube.

Note: Do not pull back flange any more than necessary. The top pillow bearing lower seal can be damaged by flexing shaft excessively!

Step#14 Installing the belts is basically the reverse of the removal process.

Note: After installing all the belts on the secondary align the flange with your benchmarks and ensure that all original shims are still in place.

Step#15 Slide belts carefully over engine cup to prevent scoring the new belts. Work them one by one into proper sheave aligning with the secondary pulley.

Step#16 Align the cup ears with the clevis slider rails and lift cup into position. Insert cross bolts when properly aligned.

Note: Both a flat blade screwdriver (lifts cup) and long tapered drift (align holes) are helpful to accomplish cup installation. Make sure top engine bearing recess is facing forward before adjusting belts.

Step#17 Re install clutch arm if previously removed.

Step#18 Jack engine to original height and re-install and torques three mount bolts.

Step#19 Using all thread adjuster tighten belts to proper tension. Once properly tensioned snug up cross bolts on slider.

Note: Prior to adjusting apply a small amount of anti-seize to all thread bolt (prevents galling).

Cross bolts should be easy to rotate by hand after “snugging”. (too much and clevis will crack)

Step#20 Re-attach torque link. Verify that valve covers are clear of both tail boom support rods.

Step#21 Re-install fan blade. Align index mark for correct “clocking”.