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930porsche
 
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Ball bearing for oil pressure switch




On a 1978 930 3.3 engine, does the ball go to location #1 or #2? This is the pressure oil line connection for turbocharger with oil pressure switch.

Thank you.
Old 09-15-2009, 11:39 AM
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beancounter
 
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I just disassembled this area on my engine. The ball was sitting in the #2 location you indicated. Question for you though...if you put the ball in #1, won't it just fall through? Looks like it would from the photos.

Now I'll have to go and check with my parts...
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Old 09-15-2009, 11:46 AM
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hole #2.

===========================
most of us prefer hole #1 but..... yeah
Old 09-15-2009, 11:49 AM
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Quote:
Originally Posted by jwasbury View Post
I just disassembled this area on my engine. The ball was sitting in the #2 location you indicated. Question for you though...if you put the ball in #1, won't it just fall through? Looks like it would from the photos.

Now I'll have to go and check with my parts...
When the motors running oil pressure pushes the ball upwards and stops at the bottom of the slotted banjo bolt because it's thicker than the hole.
The two slots at the bottom of the bolt act as oil flow restricters to reduce the amount of oil going to the turbo. When you shut the motor off the ball goes back into the bottom of hole #2 and seats there acting as a check valve keeping oil in the line going to the turbo bearing housing while the motor sits after shutdown.
Old 09-15-2009, 11:56 AM
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930porsche
 
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Ball bearing

The interesting thing is that #1 is slightly close and will hold the ball also since the hole is smaller than the ball. I thought #2 location was a hollow hole. Please explain.
Old 09-15-2009, 12:05 PM
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930porsche
 
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Ball bearing

When I took #1 out completely from the engine, looking inside it and saw a almost closed hole where the ball could sit in there without going through. I thought I looked down to #2 hole and seemed to be completely holllow straight through. You are saying the ball should go to inside #2 to the right?
Old 09-15-2009, 12:16 PM
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930porsche
 
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Ball bearing

#1 and #2 location is able to fit this ball since they are both mostly closed with a small hole to pass the oil but not big enough to pass the ball. How big is this ball anyway? I do not have one in there.

Last edited by 930 porsche; 09-15-2009 at 06:14 PM.. Reason: Needed more explanation.
Old 09-15-2009, 06:11 PM
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last i heard it's 9mm... and if you have a 3K turbo it should be there or you have a mosquito fogger.
Old 09-15-2009, 06:18 PM
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Ball bearing

What is a mosquito fogger?
Old 09-15-2009, 06:55 PM
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you'd know if you had one

lots of fun at traffic lights. . .

jussst keep staring straight ahead in the swirling abyss
Old 09-15-2009, 07:00 PM
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7.0:1 > 11.3:1
 
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"jussst keep staring straight ahead in the swirling abyss" Haha good one!



Old 09-15-2009, 07:32 PM
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930porsche
 
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Ball bearing

It looks like 3/8 inches ball which I cannot find anywhere. Can I go a little smaller? Our host does not have it either. I could probably find a smaller ball at ACE HARDWARE. Any suggestion where I can get a 9MM ball if any?

Thank you.
Old 09-16-2009, 07:07 AM
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3/8 inch is 9.5 mm.

I used a 3/8 inch ball in mine with no problems.

You should be able to find a 3/8 loose ball at any bearing house.

They sell 9mm sling shot ammo overseas. Which is just 9mm ball bearings. Check e-bay or search 9mm slingshot ammo.
Old 09-16-2009, 07:16 AM
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930porsche
 
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Ball bearing

I will do that.
Thank you Nocarrier.
Old 09-16-2009, 08:03 AM
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Quote:
Originally Posted by 930 porsche View Post
Any suggestion where I can get a 9MM ball if any?
The correct size is 9mm.
Available on line from McMaster Carr
http://www.mcmaster.com/#
Part Number 9292K44, $3.56/pkg of 20
High-Precision Bearing Balls
Ball Material: E52100 Alloy Steel
Diameter: 9 mm
Diameter Tolerance: 0.0001"
Sphericity: 0.000025"
Rockwell Hardness: C60-C67
Specifications Met: American Society for Testing and Materials (ASTM)
ASTM Specification: ASTM A295
Note: Balls are grade 25.

IMO, McMaster Carr is The go-to on-line hardware company. It Will have the parts you want in stock, ship same day.
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Old 09-16-2009, 07:36 PM
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Pelican should order a bag of 20 and put them in the catalog. They could charge $5 each for them when it gets lost or whatever.

This is the 3rd or 4th time in the last few years I've read where someone found the ball is missing.

If your oil isn't really clean it's hard to see it under the 1/2" of oil sitting on top of it when you remove the banjo bolt. You can feel it's round surface under the oil with a machinest scribe or real small screwdriver, or lift it up with a small magnet.
Old 09-16-2009, 08:02 PM
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930porsche
 
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Ball bearing

356-930 great site, thank you.
JFairman, I totaly agree with you that our host should have those ball for sale.
I want to thank all of you for pitching in and helping me with this problem. As we all know that little details make a huge difference in the way the engine runs and behave. I found a 3/8 inch ball bearing at ACE HARDWARE and worked out great.
Old 09-17-2009, 05:29 AM
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930porsche
 
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Ball bearing

JFairman,

I took a magnet and went in the hole and no ball for sure. Thank you for the detail though. I am glad this is over. I am wondering if this is what cause the small oil leak from the turbocharger connection to the intercooler pipe? When the boost comes in, maybe too much oil was comimg without the ball bearing? I will go on the HWY and bring the boost in and see if it is still leaking a little bit of oil or not.

Old 09-17-2009, 05:48 AM
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Nice find 356!

This is why I love this place!
Old 09-17-2009, 06:58 AM
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OFF THE BOOST PIPE NOW...
 
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Why are so many missing? Do people work on the car and say WTF is the ball bearing doing in here and pitch it?
Old 03-31-2010, 05:47 AM
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