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3 PT SERIES PUMPS PT / PG / PD REPAIR<br />
3.23 Testing<br />
Suction Test<br />
Required Tools:<br />
Vacuum Gauge - P/N 28755<br />
Tachometer<br />
1. Fill pump housing with cold water until it flows out from<br />
discharge port.<br />
2. Tighten pump cover and prime plug .<br />
3. Bring engine up to operating speed. Check engine<br />
RPM. See Section 1.10, 1.11, & 1.12 Technical Data<br />
for different PT engine speeds.<br />
Note: Keep pump housing filled with water at all times<br />
while pump is running. If too much water is lost during test<br />
procedure, stop engine and reprime pump. It may be<br />
necessary to tilt pump or partially cover discharge port, to<br />
prevent water in the pump housing from being lost while<br />
still allowing air to be vented.<br />
4. Grease mounting face of vacuum gauge (1), to ensure<br />
a good seal. Press gauge over inlet port.<br />
5. Gauge reading should slowly climb and then hold<br />
steady.<br />
6. With gauge still against inlet port, turn off engine.<br />
Gauge reading should not change.<br />
Note: See vacuum chart for appropriate gauge readings.<br />
This test MUST be completed within a few minutes to<br />
prevent the water in the pump housing from getting hot,<br />
which will result in lower readings. If possible, allow cold<br />
water to run into discharge port while testing pump.<br />
3-32<br />
in.<br />
Hg<br />
( KPa)<br />
ExcellentSatisfactory 20–<br />
24<br />
( 68–<br />
82)<br />
16–<br />
20<br />
(<br />
55–<br />
68)<br />
1<br />
1033SD63<br />
1033SD65
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