Generator vibration
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10-05-2008, 14:20
Post: #21
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Generator vibration
Vibration was the clue. Lost isolator may only be a result and
not 'the' problem. Greg94ptCa --- In WanderlodgeForum@yahoogroups.com, "Scott Forman" <scottforman75@...> wrote: > > SUCCESS! > > I suspected that the fan might be my big vibration source, and after > disconnecting power to it and running the motor I was right. > > The vertical radiator and fan on the PT's are designed as a sub- > assembly that comes out in one piece. This subframe attaches to the > coach at three places...two under the radiator and one furter in > towards the centerline. The two mounts under the radiator are rubber- > isolated mounts, and even after all these years they are still doing > a good job of minimizing vibration transfer. The culprit, though, > was the third point. There was a plain metal pin attaching the > subframe to a vertical frame member that is attached to the main left > side frame rail. Vibration from the fan was passing right through > that pin, up the vertical member, and into the main frame. Since the > steering linkage passes through this frame rail, it was allowing > transfer into the steering column and into my hands on the wheel. > > To address this problem, I used a floor jack to support the subframe > and removed the metal pin. In its place, I inserted a bolt inside a > length of small rubber hose. With the hose acting as an isolator, > the amount of vibration transferred into the frame is greatly > reduced. I am very happy with the results. > > Score one for shade tree engineering. > > Scott Forman > 86 PT38 > Shakin a little less in Memphis > > --- In WanderlodgeForum@yahoogroups.com, Hisham Amaral > > > > > Scott > > > > Mount dampening and isolation in our case is experimentally done, > We do not have the tools needed to do any computer designs to get the > best dampening results. Therefor we have to experiment with different > mounts to get the desired result. My advise is to play with different > durameter rubber mounts that will get you what you want in dampening > the vibration you are getting from your Gen set. I would call > (BB) CCW Engineering to see if they have any off the self mounts that > can replace your existing mounts or would they suggest a vendor that > can work with you to improve your condition. > > I retired from automotive engineering 2 years ago and do not have > any contacts in that area > > I will make a few calls to my old friends at Chrysler to see if we > can get any additional information that can lead you to an acceptable > results. > > Will talk again soon, and good luck, > > > > Hisham Amaral > > 97 WLWB Michigan > > > > --- On Sat, 10/4/08, Scott Forman <scottforman75@> wrote: > > > > From: Scott Forman <scottforman75@> > > Subject: [WanderlodgeForum] Generator Vibration > > To: WanderlodgeForum@yahoogroups.com > > Date: Saturday, October 4, 2008, 8:11 PM > > > > > > > > > > > > > > Does anyone have any good tricks for reducing vibration from the > > Yanmar/Kohler generator? > > > > Scott Forman > > 86 PT38 > > Memphis > > > |
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10-05-2008, 14:42
Post: #22
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Generator vibration
Dick, we'll be there for sure. I better sign up to get a space in
the inner circle. I understand they line us up in model year???? puts authentic Cajin Gumbo 4 rigs to my right and a fine selection of bottle wines just to the left. Greg --- In WanderlodgeForum@yahoogroups.com, "Joyce and Richard Hayden" > > Greg, > Remember Doug & Terri at last Q rally more or less in front of you guys? He let the vibration go too long and had to get a new motor. Took out the bearings. They have since sold the coach. Very nice unit - light blue. > > See you at Q this Jan. > > Dick Hayden - '87 PT 38 - Lake Stevens, WA > > ----- Original Message ----- > From: Gregory OConnor > To: WanderlodgeForum@yahoogroups.com > Sent: Sunday, October 05, 2008 8:40 AM > Subject: [WanderlodgeForum] Re: Generator Vibration > > > replacing mounts to 'new stock' as Fred writes may be all you can do. > softer mounts often isnt better. and non stock can prove issues at the > exhaust. I wonder if stock vibration was ever an issue or if your > vibration is a degenerative / failure result? Often vibration is a > sign of a broken mount or a engine idle/run cadence problem. this is a > good place to view the results of members repairs to that prob. > > The 94pt powertec has an electric fan. my fan makes more vibration than > the engine. as it starts up I can see that the blades are unbalanced. > the other area of probable vibration is the union to the exhaust. some > setups may have vibration at the coupling of the 'engine to genhead' . > the coupling in many has little variable of alignment and in later > years the engines were fitted with cone shape crank shafts. I have seen > the bolts between the genhead and the engine (LightTowers) snap due to > alignment issues at the genhead/engine union. > Vibration is one of those energies where control of of must consider > newtons "for every action " law. > > Greg94Ca > --- In WanderlodgeForum@yahoogroups.com > wrote: > > > > Hi Scott > > My suggestion is to look at the engine mounts and consider replacing > them. > > I had an SP36 that vibrated badly and replacing the mounts helped > considerably. > > > > Fred & Jeanne Hulse > > Morristown Arizona > > 1997 Wanderlodge WLWB41 > > > |
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