Wanderlodge Owners Group  
BuyByeBlueBird.com
Donate

Go Back   Wanderlodge Owners Group > Mechanic's Corner > Generators

Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

Site Search:
Reply
 
Thread Tools
  #1  
Old 06-26-2018
chrisa chrisa is offline
Junior Member
 
Join Date: Feb 2014
Location: Alamosa
Posts: 8
Default Generator Running Full RPM and Overheating

Hi everyone,
I must admit I am a novice when it comes to generators, so this may seem simple to someone (I hope). I have a 12.5 KW Kohler generator that is overheating as it is spewing radiator fluid, but only immediately after the motor has been shutoff. Upon investigating it further, I noticed that the generator motor is running at full speed against the stop screw even under no load. My guess is that the generator loses its radiator fluid because it goes from max rpm to a dead stop which boils the fluid. The amount of load doesn't make a difference as it just runs at max rpm even under no load or load change. The only way I have been able to slow the motor down (and prevent boiling fluid upon shutoff) is by adjusting the stop screw to limit the overall maximum rpm that the motor can run. Can anyone help me with this?

Click image for larger version

Name:	thumbnail 1.jpg
Views:	68
Size:	159.4 KB
ID:	56149

Click image for larger version

Name:	thumbnail 2.jpg
Views:	61
Size:	115.8 KB
ID:	56150

Click image for larger version

Name:	thumbnail 3.jpg
Views:	63
Size:	135.6 KB
ID:	56151

Click image for larger version

Name:	thumbnail 4.jpg
Views:	63
Size:	149.8 KB
ID:	56152
__________________
Chris Allington
Alamosa, Colorado
1980 Wanderlodge

Last edited by chrisa; 06-26-2018 at 02:20 PM.
Reply With Quote
  #2  
Old 06-26-2018
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
Forum owner
 
Join Date: Dec 2007
Location: Port St Joe,Fl
Posts: 35,699
Default

The engine speed on your generator is set to provide volts and hertz where they need to be.
Its a constant RPM engine in your application.
Now,unless you can set it back where it was your hertz may be off.


I suspect your rad cap is bad,at least thats the first thing i would check.
__________________
DO NOT SEND PM
email me at randy@randydupree.com only.

Randy Dupree
2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
www.buybyebluebird.com

randy@randydupree.com
Reply With Quote
  #3  
Old 06-26-2018
gcyeaw's Avatar
gcyeaw gcyeaw is offline
Gardner
 
Join Date: Dec 2007
Location: Ridgewood
Posts: 8,853
Default

Get a volt meter with an AC Hetrtz (Frequency) capability, connect it to an outlet or other generator load and set the gen speed for 60 cycles/second. If the frequency is off by too much you will damage your appliances (AC units, microwave, etc). As Randy said, the generator runs at a constant speed and as the load increases the governor adjusts the fuel to compensate and maintain rpm's.

Some modern generators use an inverter to change DC to AC. The frequency is independent of the gen speed. These units will adjust the speed based on the load, but the old Kohler units don't do that.

Leave a little room in the radiator for expansion, same goes for the 3208.
__________________
Gardner Yeaw
86 PT-36 Golden Memories
83FC35 SB $IXTEEN TON$ SOLD
78 FC 33 Happinest (Sold)
Ridgewood, New Jersey

Last edited by gcyeaw; 06-26-2018 at 03:14 PM.
Reply With Quote
  #4  
Old 06-26-2018
chrisa chrisa is offline
Junior Member
 
Join Date: Feb 2014
Location: Alamosa
Posts: 8
Default

I set the stop screw back where it was, but I don't have a hz check on my multimeter. I checked the voltage inside and it was at 130ish volts. Seems high. Is the radiator cap generic where I could just buy another at NAPA? I unscrewed it, cleaned the rubber gasket and put it back on. The radiator fluid is just at the top of the fins. Is this high enough? Do these things normally boil when turned off?
__________________
Chris Allington
Alamosa, Colorado
1980 Wanderlodge
Reply With Quote
  #5  
Old 06-26-2018
Rick's Avatar
Rick Rick is offline
Senior Member
 
Join Date: May 2009
Location: Bellefonte
Posts: 13,226
Default

No they don't normally boil over. Cleaning the rubber seal will not fix a weak spring. Just take the cap to a parts store and buy the proper replacement.

That voltage is too high. I would fix it or prepare to replace some AC stuff.
__________________
Rick Shawver
1SG Ret
2000 LX
Vise Grips
Bellefonte, AR
F127656
Reply With Quote
  #6  
Old 06-26-2018
gcyeaw's Avatar
gcyeaw gcyeaw is offline
Gardner
 
Join Date: Dec 2007
Location: Ridgewood
Posts: 8,853
Default

Radiator cap is generic, match it up at Napa or wherever. What is the normal running temperature? Might want to change the coolant if it hasn't been done that you know of. My old Kohler/Perkins dumped a little out the overflow tube, but not constantly.
__________________
Gardner Yeaw
86 PT-36 Golden Memories
83FC35 SB $IXTEEN TON$ SOLD
78 FC 33 Happinest (Sold)
Ridgewood, New Jersey
Reply With Quote
  #7  
Old 06-26-2018
chrisa chrisa is offline
Junior Member
 
Join Date: Feb 2014
Location: Alamosa
Posts: 8
Default

I went and borrowed my father's multimeter with hz setting because I either fix it right or pay for it later. How do I adjust this thing properly?

I am going to take the cap to NAPA and replace the fluid. The water temp wasn't running hot according to the gauge the last time I ran it.


Thanks everyone for helping me with this!
__________________
Chris Allington
Alamosa, Colorado
1980 Wanderlodge
Reply With Quote
  #8  
Old 06-26-2018
mpierce mpierce is offline
Senior Member
 
Join Date: Feb 2014
Location: Scranton
Posts: 1,653
Default

Change engine rpm to get proper Hertz.
__________________


Melvin and Charlene Pierce
Scranton, ND
"Smoke N Mirrors" Royale Conversion
1990 PT40WB
Reply With Quote
  #9  
Old 06-26-2018
chrisa chrisa is offline
Junior Member
 
Join Date: Feb 2014
Location: Alamosa
Posts: 8
Default

So, I adjusted the stop screw down and I can't seem to figure out how to get the hertz down. It doesn't seem to matter how many times I screw it, it is staying at 180-190 hz. I know this is way to high, but it won't decrease down to 60. The voltage did go down slightly to 125. Do I set voltage first or hz first?
__________________
Chris Allington
Alamosa, Colorado
1980 Wanderlodge
Reply With Quote
  #10  
Old 06-26-2018
gcyeaw's Avatar
gcyeaw gcyeaw is offline
Gardner
 
Join Date: Dec 2007
Location: Ridgewood
Posts: 8,853
Default

180 is beyond the engine capabilities, check your meter settings, check an outlet rather than some direct generator connection. Voltage is probably not user adjustable depending on the specific regulator. Do speed first.
__________________
Gardner Yeaw
86 PT-36 Golden Memories
83FC35 SB $IXTEEN TON$ SOLD
78 FC 33 Happinest (Sold)
Ridgewood, New Jersey
Reply With Quote
Reply

Bookmarks

Tags
governor, high idle, kohler 12.k kw, overheating

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Generator running hot Big Al Generators 24 03-11-2018 10:48 AM
overheating generator fuel tank problems Goldcrest Generators 14 07-28-2015 04:43 PM
Generator Shut down due to Overheating robwillard Generators 23 06-27-2014 09:26 PM
Generator overheating and shutting down rjtoles Generators 8 07-12-2011 12:40 PM
Generator running temp Dennis and Joan Generators 25 08-28-2009 03:53 PM

Web Search:

All times are GMT -4. The time now is 01:11 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.