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Old 11-30-2023, 02:09 PM   #1
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Question Vacuum pump replacement

I've been busy but now I have time for the bus.
Last summer I finished installing a new fuel pump and then took a 1500mile road trip. The bus was almost perfect. The only thing was the vacuum pump.
About 1/2 through the trip I noticed that while I could stop OK, if I let the bus creep up and kept pushing on and off the brake to stop again the braking got harder and harder.
Under the hood I could hear a funny noise coming from the vacuum pump.
I got home OK and I had no problem diagnosing the problem. fig 1 shows the problem, a spring coming out of the top of the pump. After releasing the tension on the belt, unbolting the pump and going to church for a month to ask for forgiveness for all that I said during that process,I was able to pull off the pulley.
My issue is that I saw a little rust on the shaft and corresponding rust on the pulley.


Do I need to worry about this?
Is there any tricks to getting the pulley back on the new pump
p { line-height: 115%; margin-bottom: 0.1in; background: transparent }
Attached Thumbnails
Vacuum pump sprint_V0-28884-dscf4443.jpg   vacuumPumpPulley_V0-29015-dscf4548.jpg  

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Old 11-30-2023, 03:09 PM   #2
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I wouldn't worry.

You can clean it with a little sand paper if you'd like. Don't get aggressive cleaning that, as it's a press fit pulley and you don't want to make the hole too big.

No trick, just don't press it on too far, as that will cause the pulley ledge to ride the belt and squeal.

Some other tidbits for you.

1. Use a motorcraft pump. They're the only ones I've found to last.
2. Remove the back cover and make sure it's full of oil. I've caught some that leaked out during shipping.
3. Use a hand pump and leak test the vacuum system on the bus, as a leaking system will fail the next pump in short order.
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Old 12-01-2023, 09:30 AM   #3
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A nice press fit is what you want, easy on the cleaning. I have a 2002 E350 7.3 and replaced the vacuum pump because I didn't like the sound, the new one makes the same sound, noisy. Yours must have a million miles on it to wear a hole in the cover with the spring, and you got home that way, congratulations! While your in there go ahead and replace all the hoses and maybe even the water pump and alternator and possibly the power steering pump for peace of mind while out on the road. That's what I did, radiator was leaking so it got everything replaced on the front of the motor at the same time including the power steering pump and high pressure hose....except the vacuum pump, it was replaced earlier. You might look at the fan clutch also for leaks. Usually I keep vehicles till they drop so I like the peace of mind that all the age degrading accessories are good to go for a long trip at a moments notice.
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Old 12-29-2023, 02:28 PM   #4
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Thanks for the tips, with xmas out of the way this project has popped back to the top of the stack.
When you say "make sure it's full of oil", is there a mark?
also what kind of oil if it needs it.
Thanks



Quote:
Originally Posted by Booyah45828 View Post
I wouldn't worry.

You can clean it with a little sand paper if you'd like. Don't get aggressive cleaning that, as it's a press fit pulley and you don't want to make the hole too big.

No trick, just don't press it on too far, as that will cause the pulley ledge to ride the belt and squeal.

Some other tidbits for you.

1. Use a motorcraft pump. They're the only ones I've found to last.
2. Remove the back cover and make sure it's full of oil. I've caught some that leaked out during shipping.
3. Use a hand pump and leak test the vacuum system on the bus, as a leaking system will fail the next pump in short order.
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Old 12-30-2023, 05:58 PM   #5
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yup my new one seems to be louder than the original one?
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Old 01-02-2024, 09:42 AM   #6
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Theres a bolt in the back cover of the pump.

Sit the pump like this on the work bench.

Remove the bolt. Fill it with synthetic 90w gear oil until it runs out the hole, once it's done running out, reinstall the bolt.
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Old 01-02-2024, 09:43 AM   #7
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Check for vacuum leaks afterwards. As a leaking booster or whatever will kill a vacuum pump quickly.
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Old 01-03-2024, 07:13 AM   #8
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thanks, it on the list once the rain stops
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