Westerbeke 4.5 KW drive belt replacement

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by msballin, Nov 23, 2015.

  1. msballin

    msballin Member

    229
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    Good morning - I'd like to replace the belt on my Westerbeke 4.5 KW generator as it looks worn and as well has gotten some oil on it as a result of a leaky seal on the oil filter. Can you advise me as to where the tensioner (if there is one) is located? And if not, how best to remove the old belt. Also, can this belt be replaced with one purchased at an auto parts store or must it be OEM? Thank you in advance.
     
  2. bahamabreisus

    bahamabreisus Well-Known Member

    Oct 25, 2007
    Hampstead NC
    500 dancer, previous 420,390,300 dancers
    detriot 8v92
    I think the alternator is used for tightening the belt. Take the old belt with you to any auto parts store, they should be able to cross the numbers.
     
  3. msballin

    msballin Member

    229
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    thank you. much appreciated.
     
  4. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Go to NAPA and make sure you get the right size "Gold" grade belt.
     
  5. msballin

    msballin Member

    229
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    Thx!
     
  6. msballin

    msballin Member

    229
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    the westerbeke manual refers to a timing belt replacement. Sorry if this is a silly question...is this the same belt as the drive belt?
     
  7. msballin

    msballin Member

    229
    May 30, 2008
    Islip Terrace, Long Island
    2000 340 Sundancer
    Twin 7.4L Horizons w/ Hurth V-Drives
    ok..answered my question. two belts...one timing and one drive for cooling system. the manual states to loosen the mounting screws on the raw water pump. I have located the pump. However I can't seem to determine where the mounting screws are. Any assistance would be greatly appreciated. Thanks
     
  8. Shawnald55

    Shawnald55 New Member

    2
    Jun 22, 2018
    310 Sundancer 2001
    5.7 Mercruisers
    Hey, I know this is an old thread, but just in case anybody else stumbles here, still looking for an answer, THE OWNERS' MANUAL FOR THE WESTERBEKE BCGB 4.5 IS WRONG.

    There's no diagram for replacing the raw water pump belt (or the governor belt, for that matter). Thanks Westerbeke!

    The user manual tells you to loosen the mounting bolts for the Raw Water Pump assembly. NO!!! Your darn pump will fall out and you'll break the gasket and it won't help you install the belt. If the belt was loose before, it will be just as loose after you remove the raw water pump to seat the belt. There's no "adjustment" to the raw water pump wheel.

    On the underside of the pulley (middle left) are two 10mm bolts. Mine were rusted over, I could barely even see them.

    Loosen the pulley mounting bolts. I had to spray the whole thing with rust remover to get the pulley mechanism to slide. Then use a pry bar or a big wrench handle to lever the pulley mechanism (it mounts to a little "sled" for lack of a better word) and tighten the 10mm bolts while keeping the belt tightened.

    EDIT: You'll need a 10mm box end wrench. Unlikely you're going to be able to fit a socket head in the gap.
     
    Last edited: Dec 5, 2018 at 11:05 AM
  9. LG111

    LG111 Active Member

    448
    Jan 4, 2015
    NW
    410
    8.1
    Yep that's correct!

    Also for the governor. Dont forget to change the oil in that too! I think they say every 250 hours.
    Two bolts to take the governor off plus the cable hook. oil drain plug on the bottom, weep hole on back side, fill on the top.
    Open the weep hole, drain the bottom. Close the bottom and fill from the top until it comes out the weep hole. Close weep and close top. Done.
     
  10. Shawnald55

    Shawnald55 New Member

    2
    Jun 22, 2018
    310 Sundancer 2001
    5.7 Mercruisers
    Oh wow. I had no idea. Thanks for the heads up! 99.9% sure the guy who owned the boat before me never did this, so it probably needs doing.

    I can almost remember when I had more weekend than I had boat maintenance to eat it up.
     
  11. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    IMG_2098.JPG
    When did WB stop using oil in governors? Mine is a 5 kw. No oil. Does yours use oil? What output is it?
     
  12. dwna1a

    dwna1a Well-Known Member PLATINUM Sponsor

    Apr 23, 2012
    James River
    88 Weekender 300 "Seahorse"
    Twins 350
    There is a addition to the manual that was put out by Westerbeke that shows all of this. It's somewhere in this house or out in the shop. It also shows everything you want to know about the governor.

    As soon as I lay my hands on the manual I will post the supplement numbers, maybe then folks will be able to find it online

    One last thing, there are a good deal of mistakes in the manual. Just be sure to review it carefully when using it and working on the unit
     

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