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Old 11-02-2010, 11:37 PM
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Small Block Chevy Oil Pump Quandry

Ok guys here is my problem. I have a 97 k1500 vin code R 4 wheel drive suburban, Wife blew the motor, bought a crate motor from GM. Just a standard 255 h/p replacement motor. Got it on the stand now. Went to put the oil pump in and found that I could not get the oil pump shaft to stay on the pump itself. This was with the nylon retaining collar. So I got a replacement Melling shaft (Part # IS-55E) with the steel collar. Goes on, turn it upside down and it falls off. It does not "click" when you put it on. Went to several parts stores, looked through several boxes of pumps and shafts and they all have the same problem. You put them together, turn it upside down and the shaft falls off. Called the dealership, they are flummoxed. Called Melling and they said it has always been that way. I disagree. Every motor I have ever built up to now, the shaft would "click" in place and stay on. Has anybody else had this problem? And if so, how did you solve it? I see 2 solutions, either put a big dollop of grease on the end of the shaft and put it all together or install the shaft once the motor is right-side up. Any suggestions?? By the way, the pump is a Melling M155.

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Old 11-02-2010, 11:49 PM
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Get a new pump, retainer and shaft, I used a Mildon HV Pump, Factory TBI Shaft and a Plastic retainer, once clicked together it NEVER came apart (Was sort hard to click together)
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Old 11-02-2010, 11:53 PM
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And that is what I normally do also. That was the point of my expedition to the parts stores today. It was the same story allover town. Nylon or steel retainers. We tried several M155 & M155HV pumps. All with the same results. The parts guys are even shaking their heads.
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Old 11-03-2010, 12:05 AM
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Hmmm, your using Melling pumps?

I would go to a Milidon.
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Old 11-03-2010, 12:17 AM
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Yep, always have. Never had any trouble until now. It is just one of those weird anomalies I guess.
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Old 11-03-2010, 02:50 AM
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Steel collar pump drives have never "clicked" on. Just install drive shaft in the guide hole. Install oil pump. When engine lower end is assembled. Turn engine over and carefully turn oil pump shaft fron the top. It will slip down over the pump shaft. A non problem..

Milodon pumps are just re-packaged.
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Old 11-03-2010, 02:51 AM
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Sounds normal to me. With the steel collared shaft it can come off the pump but can't go anywhere as the collar won't fit through the hole in the block. With the engine back right side up all you have to do is possibly turn the shaft with a large screwdriver to get it to re-engage the pump. Once the distributor is in the shaft is fully captured at both ends and can't go anywhere.
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Old 11-03-2010, 03:31 AM
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i agree Its captured once in place
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