The cylinder remachining for each of the pumps should meet the specifications detailed in the table
below:
Warning! Do not exceed the maximum remachined diameter. By exceeding the maximum
diameter it presents the risk of compromising both structural integrity and durability of the
vacuum pump. Increased bore diameter will reduce vane support therefor reducing vane
life and increases risk of vane breakage.
Checking and Setting the Seal Gap Clearance:
If the cylinder has been rebored and/or honed the seal gap clearance needs to be checked and set
as required.
The seal gap is the distance between the outer diameter of the rotor and the top of the inside of the
cylinder bore. The seal gap is set at a certain specification to provide the maximum performance
and efficiency.
The seal gap clearance for each of the pumps should meet the specifications in the table below:
This clearance can be checked by inserting the proper sized feeler gauge in the exhaust port of the
pump across the top of the rotor to the inlet side of the pump.
Note: When checking the seal gap clearance the rotor should be turned so that none of
the vane slots are at the top of the cylinder.
To accurately check the clearance this should be done at three points: in the center of the pump;
and at each end of the rotor near the end cover. This will help ensure that the rotor is parallel with
the cylinder bore.
If the clearance is within specification the dowel pins will not have to be refitted.
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