LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Water pump drive shaft

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Old Apr 12, 2015 | 09:30 AM
  #1  
KYWes's Avatar
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Water pump drive shaft

'95 Z28

How does one remove the drive gear assy for the water pump that engages the cam gear?

There is a bearing that appears to be pressed into the block and the shaft of the gear assy appears to be pressed into the bearing.

When I removed my assy I drove the shaft out of the bearing leaving the bearing in the block. When an assy I purchased arrived it came complete with the bearing on the shaft.

With the assy in place there's no way that I can see to use a bearing press or puller. Would one drive the bearing out from the back using a socket or something of proper size if so how does one install the assy.
Old Apr 12, 2015 | 09:49 AM
  #2  
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Re: Water pump drive shaft

The bearing isn't pressed into the block, it's retained by a plate with two torx head bolts.

Old Apr 12, 2015 | 12:50 PM
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Re: Water pump drive shaft

I took the two bolts out and the plate. But the parts didn't just slip out. I'll try again to remove the bearing from the block.

Originally Posted by Injuneer
The bearing isn't pressed into the block, it's retained by a plate with two torx head bolts.

Old Apr 12, 2015 | 04:17 PM
  #4  
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Re: Water pump drive shaft

My bearing is either stuck or pressed in. I can't budge it with my bare hands.
Old Apr 12, 2015 | 04:53 PM
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Re: Water pump drive shaft

It is a very tight non press fit. You should be able to tap it out with a hammer and drift...
Old Apr 13, 2015 | 08:33 AM
  #6  
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Re: Water pump drive shaft

It'll come out, just pry gently on the flange that the torx go in...gently
Old Apr 15, 2015 | 08:10 AM
  #7  
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Re: Water pump drive shaft

I already had the shaft out of the bearing leaving the bearing in the block. I decided to "press" the bearing out by using a 6" C-clamp and a couple of sockets.

The bearing took some pressure to break free but then it popped and slipped out with no problem.

Just offering for future reference for others.
Old Apr 15, 2015 | 07:28 PM
  #8  
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Re: Water pump drive shaft

I was able to install the new used drive shaft by tightening the hold down bolts alternating between the two.

BTW, I tried three Chevy dealerships (2 local and GMPARTSDIRECT.COM) and no one had the driveshaft or could find a dealer they could get one from also not available from other aftermarket sources. Bought two off eBay and installed the best one.
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