oil pump drive shafts
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oil pump drive shafts

  1. #1
    B1 Racing cs19's Avatar
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    Default oil pump drive shafts

    anyone ever broken one?

    found a broken off tang where it hooks onto the distributor on a friends Chevy, caught it in time but got lucky. Looking at going to this setup on our engines. We are both running the titan pumps.

    http://www.titanspeed.com/content/pu..._hexdrive.html
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  3. #2
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    Do either of you run magneto's?

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    B1 Racing cs19's Avatar
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    No MSD dist. and the georotor oil pump.
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    Then probably that shaft deal they offer is the best way to go.
    For a spur gear type pump the aftermarket Morosso or ARP shaft have never seen one fail. Have seen the pins they use to keep the collar on the shaft come loose though. But no broken tangs or twisted shafts.

    Also bear in mind something may have gone through that oil pump to cause the broken tang. You might wanna look.

  7. #5
    steelcomp was here
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    Quote Originally Posted by cs19 View Post
    anyone ever broken one?

    found a broken off tang where it hooks onto the distributor on a friends Chevy, caught it in time but got lucky. Looking at going to this setup on our engines. We are both running the titan pumps.

    http://www.titanspeed.com/content/pu..._hexdrive.html
    The Titan deal looks pretty cool, but I've never seen a HD stock-type oil pump shaft fail either. Was the one that broke an aftermarket shaft with the steel collar? I agree with Fiat...you might check the pump for something foreign or signs of internal damage.
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  8. #6
    B1 Racing cs19's Avatar
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    Scott, The shaft that broke was aftermarket and was one solid piece of steel. I will post of a pic of the shaft, I think its a crappy design.
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    Ok here are 2 pics of the shaft. You can see its a solid piece, hex on one end and a slot machined on the other end.



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    Shaft probably has some twist in it too. From something going through the oil pump.

  11. #9
    B1 Racing cs19's Avatar
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    Nothing went through the pump, I checked the pump out. Im thinking a shaft failure.

    Any thoughts on the upgraded shaft? I dont really see any drawbacks other than you have to cut the bottom of the dist. off and dist. gear availability.
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    That's why I asked if you ran a mag. Because mags are hard on bronze gears and the new carbon gear deal is better. But msd dist are not hard to turn....so brass gear wear is far less. So...I see no reason why not to go with Titan's fix.

  13. #11
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    The one other thing we noticed was where the dist contacts the tangs on the drive shaft there were shiny spots where it was contacting or loading. The wear marks were very small and at the outer edges of the tangs on the shaft. In other words all the load was on the very edge of the tangs, Im thinking the slot in the shaft was machined too big/sloppy fit. The red lines in the pic below resemble the wear pattern Im trying to describe. Not sure if its related but its not right IMO. Anyways just wanted to share this with you guys, if anyone is running a titan standard drive shaft Id be checking the shaft periodically, hate see one fail on someone.

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  14. #12
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    If you loose one of the tangs on the shaft wont the pump keep spinning since you have one tang still on the shaft? I dont stare at these parts every day like some of you guys so Im trying to remember what it looks like but Im thinking the shaft would stay put in the bottom of the dist and continue spinning even if you lost one of the tangs.

    One other thing is I think these georotor pumps have a bit of drag on them when you spin them, might be loading the driveshaft a little harder.??
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    Yes, because the shaft is "captured" by the dist gear it would still pump oil. The georotor deals are harder to turn than a spur gear.

    Think about it. Why would Titan come up with this "new deal" if the old deal they sold you in the first place was adequate? Maybe call them and tell them what you found.

  16. #14
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    Oh I did, he says "oh yeah those GM shafts break all the time"...From what Im gathering the GM shafts dont break all the time, more like his break all the time. They make great pumps and Ive had great service but I think there is a problem with the shaft which explains that new design. We bought the new hex drive, have not installed them yet.

    Just making conversation, this place is slow thought it might help get some action around here.
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