ADJUSTING HEAD GASKET END CLEARANCE
Use either of the following procedures to properly adjust the end clearance when replacing gaskets:
PROCEDURE A:
With balance plate in position, slide rotor and shaft into casing. Insert a feeler gage of the proper thickness into the port and between two rotor teeth (See Figure 20 on page 10). Install one 0.015” and one 0.007” gasket onto head. With the idler on the idler pin, place the head into the pump casing. With the capscrews tight, the feeler gage should fit snugly, otherwise gaskets should be added or removed until the proper clearance is attained.
PUMP ROTATION
The pump is designed to take fluid from the discharge side of the pump and channel it down the idler pin into the shaft and out into the canister through the capscrew which secures the inner magnet. The fluid is returned through a hole in the casing back to the suction side of the pump. There are generally three parts which may need replacing or adjusting to change rotation.
HEAD & PIN – Hole should be from the discharge side of head to the pin and a pipe plug is placed in the tapped hole on the suction side of the head. To change rotation, move the plug to the opposite side of the head.
BALANCE PLATE – If the plate is separate from the bracket and looks like the Style A in Figure 22, it can be reversed. The groove should connect the discharge port to the bushing bore. If rotation is changed, the plate is flipped over (not rotated) and the groove would not be visible but will still function properly. If the plate is like Style B, it is NOT reversible and a new plate will be required.
BRACKET – The bracket will have two holes drilled through and tapped on one side. The discharge side of the bracket should feature a pipe plug with a hole drilled through it. To change rotation simply move this pipe plug to the other hole.
Contact your local Viking distributor or the factory to determine which parts are required.
figure 20 |
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PROCEDURE B: |
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If the pump is in line and the ports are not accessible, |
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remove the head and gaskets. Put the head back on (without |
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gaskets) and measure the gap as shown. (See Figure 21 on |
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page 10). After determining the gap between the head and |
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casing, select a combination of gaskets with approximately | STYLE A | STYLE B |
25% more total thickness than the gap plus the required end |
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clearance. Note that the gaskets will compress when head is |
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tightened down. Remove the head, install all gaskets then |
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replace the head. Tighten the head capscrews and check |
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the pump clearance by making sure the pump turns freely |
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by hand. |
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Since the pump shaft is concealed, it is best to work up the |
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proper end clearance because it is difficult to determine when |
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there is to much end clearance with this approach. |
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figure 21
SECTION TSM 845 | ISSUE F | PAGE 11 OF 14 |
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