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Water pump turbine question

Old 01-01-2019, 05:12 AM
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Water pump turbine question

Hi !
happy New year everybody !
while repairing my clutch cover (it was drilled after i fell down), i noticed that the water pump sprocket doesn't spin freely when i make it turn with two fingers.
is it normal ?
Is it because of the seal that "rubs" ?

Last edited by melouse; 01-01-2019 at 05:14 AM.
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Old 01-01-2019, 07:56 AM
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Originally Posted by melouse View Post
Hi !
happy New year everybody !
while repairing my clutch cover (it was drilled after i fell down), i noticed that the water pump sprocket doesn't spin freely when i make it turn with two fingers.
is it normal ?
Is it because of the seal that "rubs" ?
There is some resistance due to the oil and mechanical seal, The impeller should not "spin" like a top.... but it should not be hard to turn either,...
Really hard to confirm or deny yours is as it should be over the Internet.
Only three reasons I can think of that would be at issue.
  • Damaged bearing
  • Impeller seated to far into cover and rubbing the side case cover
  • Impeller not seated far enough and impeller rubbing the pump cover
The impeller seated depth tolerance range is very small, only 0.27mm. If its off more then that it rubs. The impeller can be driven in 1/2 mm easily with a case cover and exposed impeller being roughly handled.

Its easy to spot though, look for a "ring" of wear in the side case cover behind the impeller and in the water pump cover.
Or better measure the installed depth of the impeller using a depth mic, or good caliper




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Old 01-01-2019, 09:02 AM
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I don't think the bearing is damaged, because there is no hard point when you hand-turn the sprocket.
for the impeller, i'm going to measure it.
In fact, i know it's not supposed to be fully free, but i found it really harder than others water pumps i use to handle.
it must eat a lot of horsepower.....

Last edited by melouse; 01-01-2019 at 09:30 AM.
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Old 01-01-2019, 09:03 AM
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Thanks for Your answer !
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