Stainless impeller question
+ Reply to Thread
Results 1 to 14 of 14

Thread:
Stainless impeller question

  1. #1
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default Stainless impeller question

    I have a seriously annoying rattle at idle (950-1000 R.P.M.'s). It sounds like the baffles are falling out of the headers. If I give it a little bit of gas and raise the R.P.M.'s to around 1200-1300 R.P.M.'s the rattle goes away. I thought that my flex plate was cracked, or that the starter was dragging on it, but as far as I can tell everything is okay with the flexplate and starter. I have been told by a couple of people that the stainless impellers rattle at idle, so I now have the pump apart and I have found that the impeller keyway seems a little loose, both in the brand new 17-4 shaft and in the berkeley stainless.

    If you are running a stainless impeller does it rattle ?

    Thanks in advance for any help or suggestions.

    Chris

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member lbhsbz's Avatar
    Join Date
    Oct 2008
    Location
    Long Beach
    Posts
    1,617

    Default

    I'm curious about this too. "Pump Rattle" is a failry commonly used term, but I'm curious as to what exactly is making the noise.

    If everything is assembled and clearanced properly, the only thing I can imagine making any noise is the thrust bearing since it's designed to have a significant load on it, and maybe at idle there isn't a sufficient load to effectly "seat" the bearing.

  4. #3
    Senior Member Brendellajet's Avatar
    Join Date
    Dec 2007
    Location
    Ladera Ranch
    Posts
    2,135

    Default

    Sounds like driveline.
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member W.O.T's Avatar
    Join Date
    Jan 2008
    Location
    Campo Ca
    Posts
    988

    Default

    Make Sure Theres Nothing Stuck In The Impellor. Check Your Flexplate Make Sure Its Facing The Right Way And Bolted On Correctly. Then Check Driveline. Otherwise Id Pull It Apart Before Something Goes Wrong.

  7. #5
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default

    Quote Originally Posted by Brendellajet View Post
    Sounds like driveline.
    I just replaced the U joints last season because I thought that there was too much play in them. I was told that the non greasable U joints were stronger because they are solid, not like the greasable joints that have the hole drilled through them to carry the grease from the zerk to the needle bearings. After replacing them I found that the new U joints had the same amount of movement in them. The driveshaft that I am running is about 7" long, I had it made and balanced at a driveline shop several years ago and have had no issues with it. The bolts into the PTO were just reinstalled and were tight when I took it all apart tonight.

  8. #6
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default

    Quote Originally Posted by W.O.T View Post
    Make Sure Theres Nothing Stuck In The Impellor. The impeller is on the bench and there is nothing wrong with it, or stuck inside of it. Check Your Flexplate Make Sure Its Facing The Right Way It is the right way And Bolted On Correctly Bolts are there and tight, Socket head allens that are going through the PTO and flexplate and into the ass end of the crankshaft. Then Check Driveline.It is good and tight with newer U joints Otherwise Id Pull It Apart Before Something Goes Wrong It is apart and there seems to be nothing wrong.
    Another side note is that when I disconnect the driveline and run it in the driveway, the noise is not there.

    I am hoping that the noise that I hear is the impeller, but it sounds like maybe nobody else is having this sort of problem/experiance with their stainless impeller.

    Thanks for the input and suggestions,

    Chris

  9. #7
    Senior Member Rivernut's Avatar
    Join Date
    Jun 2009
    Location
    Massachusetts
    Posts
    163

    Default

    I was told this is normal. If you don't like it you can turn up the idle speed. Mine has always made a rapping / vibrating sound that comes and goes at idle. It doesn't seem to matter if it new, rebuilt, or on it's last leg. It sounds awful.

    Real Boats Don't Have Propellers!
    -- Rivernut

  10. #8
    Blown, OHBA Member Wild Hair's Avatar
    Join Date
    Aug 2008
    Location
    Okmulgee Okla.
    Posts
    2,811

    Default

    Mine made more racket than I could put up with. When I rebuilt the pump I changed the shaft as well, and then decided to change the splined end of my drive. so far I have had a quiet pump I think my noise was comming from a worn spline or drive as I no longer have that problem.
    OHBA GROWTH THROUGH PARTICIPATION
    Built Cheyenne Tuff, With Chevy Stuff.
    well the block is GM any ways


    GOD BLESS AMERICA AND KEEP HER SAFE

    LOCK N LOAD AMERICA, OUR 2nd AMENDMENT
    IS UNDER FIRE


  11. #9
    Wet
    Wet is offline
    Banned
    Join Date
    Dec 2007
    Location
    East Hampton, CT
    Posts
    4,957

    Default

    I've head the same thing about the thrust bearing at idle.

  12. #10
    Senior Member DuaneHTP's Avatar
    Join Date
    Dec 2007
    Location
    Shell Knob, MO
    Posts
    1,379

    Default

    Thrust bearings in good condition don't rattle at idle. Loose or worn splines on the shaft or U-Joint yokes do. They can also rattle from not having enough grease in the splines. The amount of overlap that the camshaft has and the added weight of a stainless impeller magnify the problem, so just turn the idle up to 1200 rpm and it will usually go away.
    Duane HTP
    Last edited by DuaneHTP; 05-29-2010 at 06:53 AM.

  13. #11
    Senior Member
    Join Date
    Dec 2008
    Location
    Sacramento area
    Posts
    1,136

    Talking Rattle

    I've heard this is a sure sign that the impeller detailer didn't know what he was doing. lol
    Half the people in the world are below average.

  14. #12
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default

    Quote Originally Posted by schick View Post
    I've heard this is a sure sign that the impeller detailer didn't know what he was doing. lol

    That is a possibility, but like the guy that detailed it would say If you asked him about it..........What makes you the pump expert.......lol I guess that is why I havent asked him yet.

  15. #13
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default

    Quote Originally Posted by Wild Hair View Post
    Mine made more racket than I could put up with. When I rebuilt the pump I changed the shaft as well, and then decided to change the splined end of my drive. so far I have had a quiet pump I think my noise was comming from a worn spline or drive as I no longer have that problem.

    I will have to take a look at the spline I bet that is what it is. Thanks, Chris

  16. #14
    Senior Member
    Join Date
    Feb 2009
    Location
    MANTECA
    Posts
    511

    Default

    Quote Originally Posted by DuaneHTP View Post
    Thrust bearings in good condition don't rattle at idle. Loose or worn splines on the shaft or U-Joint yokes do. They can also rattle from not having enough grease in the splines. The amount of overlap that the camshaft has and the added weight of a stainless impeller magnify the problem, so just turn the idle up to 1200 rpm and it will usually go away.
    Duane HTP
    Well, It seems to be a loose spline, and maybe a lack of grease on the splines. I can feel a slight movement between the splines and the shaft. I think that I will try to grease it up and if the rattle does not go away I will break down and buy a new yolk.

    Thanks for all the help

    Chris

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95