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Thread: Problem With No Power

  1. #11
    Senior Member
    Join Date
    Feb 2009
    Location
    Northern Illinois
    Posts
    1,090
    This might help you under stand a little better.
    Sleek
    http://americanturbine.com/images/di...jg_diagram.gif
    SYM.
    DESCRIPTION
    QTY.
    PART NO. SYM.
    DESCRIPTION
    QTY.
    PART NO.
    1
    Aluminum Impeller 1
    IMB**A 29
    Bearing Cap Clipper Seal 1
    SL1007
    2
    Bowl 1
    SC9102 30
    Bowl Clipper Seal 1
    SL2003
    3
    Suction Piece 1
    H-1727 31
    Nyliner Bearing 4
    B2007
    4
    Hand Hole Cover 1
    M-4128 32
    Ball (Thrust) Bearing 1
    B1007
    5
    Nozzle Housing 1
    R1007 33
    Retaining Ring, Bearing 1
    SH1507
    6
    Steerable Nozzle 1
    L-4501 34
    Impeller Nut 1
    SH3507
    7
    Split Gland, Packing 1
    SC2507 35
    Groove Pin, Hand Hole Cover 2
    S-14479
    8
    Bearing Cap 1
    SC2007 36
    Grease Fitting, Bearing 1
    S-14480
    9
    Reverse Bucket 1
    L-4251 37
    Impeller Key 1
    SH3007
    10
    Pump Shaft 1
    SH1107 38
    Woodruff Key, Tiller Shaft 2
    R5507
    11
    Bowl Bearing End Cap 1
    SCA9001 39
    Locknut (3/8" - 24) 1
    S-26431
    12
    Sleeve, Shaft Seal 1
    SH2507 40
    Packing Gland Bolt (3/8 x 2 HHCS) 2
    F06 24 16 HH
    13
    Impeller Wear Ring 1
    WR5000 41
    Packing Gland Nut (3/8) 2
    F06 24 TL
    14
    Wear Ring Insulator 1
    WR6004 42
    5/16 LockWasher 11
    F05 LW
    15
    Tiller Shaft 1
    S-15396 43
    Bowl To Suction (1/2 x 1-1/4 HHCS) 8
    F08 13 10 HH
    16
    Reverse Bucket Shaft 2
    BN2510 46
    Nozzle & Bucket (5/16 x 1 SHCS) 3
    F05 18 08 SH
    17
    Bowl to Nozzle Gasket 1
    G2507 47
    Set Screw, Tiller Shaft (5/16 x 3/4) 1
    S-23665
    18
    Bowtl to Suction Gasket 1
    G2006 48
    Barbed Connector 1
    S-14821
    19
    Bearing Cap Gasket 1
    G1502 49
    Flange Nut, Hand Hole Cover (5/16) 2
    S-23680
    20
    O-Ring Nozzle 1
    O1502 50
    Fastener, Lock Wrench 1
    S-14493
    22
    Wrench, Hand Hole Cover 1
    S-11543 51
    Fastener Screw 2
    S-25599
    23
    Rod End, Hand Hole Cover 2
    S-10907 52
    Pipe Plug, Oil Reservoir 2
    SC9902
    24
    Set (5) Packing Rings 5
    SC3007 53
    Bearing Cap (5/16 x 1-1/4 SHCS) 4
    F05 18 10 SH
    25
    O-Ring, Hand Hole Cover 1
    O1002 54
    Plastic Rudder Kit B-07486
    26
    Suction Piece Clipper Seal 1
    SL1507 55
    5/16 - 18 x 1 HHCS 7
    F05 18 08 HH
    27
    Bowl To Nozzle (5/16 x 3/4) 1
    F05 18 06 HH 56
    5/16 - 18 x 7/8 HHCS 1
    F05 18 07 HH
    28
    Bowl Bearing (Glacier) 2
    B1502

  2. #12
    76sleek
    thanks for the diagram, that will really help, also my 76 is 23 feet, is it normal to have to run 4500rpm to keep the boat at a decent speed and on plain?

  3. #13
    Senior Member
    Join Date
    Feb 2009
    Location
    Northern Illinois
    Posts
    1,090
    thanks for the diagram, that will really help, also my 76 is 23 feet, is it normal to have to run 4500rpm to keep the boat at a decent speed and on plain?
    76SLEEK, I had a 77 Executive, 12JG I could plane off with 3500rpm's
    You may have a worn pump, might be worth pulling off the bowl to have a look. This was my beast, the picture's are after the AmreicanTurbine pump was installed. The best impeller for this boat was an AAA Legend impeller when I ran the Berkeley pump. The Turbine pump I ran the AA impeller.
    Sleek
    http://www.hotboatpics.com/pics/data...63000_0032.JPG
    http://www.hotboatpics.com/pics/data...0_0026-med.JPG

  4. #14
    SmokinLowriderSS
    You either have something trapped in the impeller/intake/bowl vanes, or you DID and it came out. As said here, anything that disrupts water flow (from diapers to bent lips on the impeller) will cause cavitation as RPM climbs. There is a cleanout hole with 2 fasteners somewhere on the suction piece of the pump. If it is outside the hull as on a Berk E or F pump, you can open it whenever you want (NOT with the motor running!!!). If it is inside the engine bay, DON'T OPEN IT FLOATING, or you will not float long, on the trailer only.
    The "Bowl" is the rounded bowl-looking part behind the boat and ahead of the nozzle assembly. Inside it is a set of vanes that "catch" the water swirling off the impeller and guide it (straightening the flow) to the nozzle. You will see them if you ever take the bowl off.
    A higher than "normal" RPM can easily be caused by a worn pump to wear ring clearance (sand is hell on them as is picking up road grit while trailering then starting it). It can also be caused by a smaller impeller.
    Some "typical" info, your setup may vary, as will what you want.
    Smaller cut impeller gives the same push at a slightly elevated RPM than a larger impeller. The sizes are alphabetical from at least AAA to D (AAA,AA,A,B,C,D) with A being very comon for most cases. This size and RPM is used to fine-tune the drive to your hull and engine. Typically, to a given engine setup, a larger impeller will push harder which helps acceleration, pulling, and for larger boats, but it reduces your RMP so you may not be able to get to your engines greatest power, or best speed. A smaller impeller will allow the engine to wind up more, thus make more HP (unless going past the engine's peak) and help top-end speed but at the cost of some acceleration and ski/tube pulling ability, as well as mileage (due to higher RPM's. Impeller flow does vary some by design from different manufacturers. For example, it is prerry accurate I guess that an Agressor impeller flows the same as a Berkeley (the comparison standard) of 1 size larger (ie, an Ag "B" will flow similar to a Berk "A", an AG "A same as Berk "AA", etc).
    Hope this was helpful, I love my jet.

  5. #15
    Ken F
    I even sucked up a 1/2" diameter twig about 2" long which got caught toward the center of the impeller in the vanes. Did the same thing you describe. A small 1/2-3/4" rock can do the same. It's amazing that just such a tiny disruption in the water flow can cause such problems.
    Ken F

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