How adjust Onan 6.5 genset idle/running ?

Pancho · 05-19-2009, 08:54 PM

How adjust Onan 6.5 genset idle/running ?

Genset seems to not be running at high enough RPM's. Seems to idle fast enough, but not certain. Issue is that it does not run fast enough when I turn the air conditioner on, because volt gauge on switch panel says 100 volts, and unit should get at least 110V. When I switch on air, I can hear the genset labor/react but it doesn't seem to run fast enough to put out the necessary juice.

Some guy told me, "Your not supposed to adjust it. It was set at the factory". Yeah right, it was set at the factory 25 years ago.

Any help, other than "It was set at the factory", would be much appreciated.

Thanks

PS.
Genset: Onan 6.5 (McGraw Edison) Model #: 6.5 MCCK 3CR / H
A/C: Marine Air, I think 11G btu.

dennismc · 05-20-2009, 12:23 PM

You will need a hertz meter to do that, I believe it is adjusted at the end of the governor lever, contact Onan for exact location of adjustment, adjust hertz to 60 cycle, plus or minus 3%

BEARVT · 10-18-2009, 08:34 PM

the generator only runs with starter motor then dies as if it is not getting spark when starter is released. any ideas. does anyone have a service manual to share?
thanks

dennismc · 10-18-2009, 09:25 PM

contact Onan on line and check for online service manuals, you may have to search under Cummins/Onan.

NYCAP123 · 10-18-2009, 10:05 PM

Quote:

Originally Posted by BEARVT

the generator only runs with starter motor then dies as if it is not getting spark when starter is released. any ideas. does anyone have a service manual to share?
thanks

Did you check water and fuel flow?

Marmot · 10-19-2009, 06:17 AM

When guessing and hoping the guy next to you at the bar might know ...

RTFM

Pascal · 10-19-2009, 07:41 AM

voltage is not adjusted by RPM! RPM affects frequency, NOT voltage. You do not want to mess with RPM unless you have a reliable Freq. meter.

Voltage is usually adjusted thru voltage regulator but you will need a manual for specifics.

typically when a genny starts but dies when the run or start switch are released, the problem can often be traced to one of the safety switches or circuit. It's not too hard to troubleshoot when you have the wiring diagram.

Marmot · 10-19-2009, 08:08 AM

Oops, it should have read;

"When guessing and hoping the guy next to you at the bar might know doesn't work ... RTFM

Henning · 10-19-2009, 09:15 AM

Quote:

Originally Posted by BEARVT

the generator only runs with starter motor then dies as if it is not getting spark when starter is released. any ideas. does anyone have a service manual to share?
thanks

If it is old enough to have points, most likely you have a bad ballast resistor. Otherwise very likely the switch.

BEARVT · 10-19-2009, 09:54 AM

Quote:

Originally Posted by NYCAP123

Did you check water and fuel flow?

yes. is there a relay that engages with the starter and gives power to the points then cuts off the power to th epoints when the unit is shutdown?

BEARVT · 10-19-2009, 10:00 AM

Quote:

Originally Posted by Henning

If it is old enough to have points, most likely you have a bad ballast resistor. Otherwise very likely the switch.

are you aware of a relay that engages with the starter then cuts off power to the points when the unit is shut down? it fires on both cylinders as long as i have the starter engaged a the exhaust manifold is hot on both cylinders.

Marmot · 10-19-2009, 11:16 AM

Quote:

Originally Posted by BEARVT

are you aware of a relay that engages with the starter then cuts off power to the points when the unit is shut down?

Try this, it's from TFM

BEARVT · 10-19-2009, 11:59 AM

Quote:

Originally Posted by Pascal

voltage is not adjusted by RPM! RPM affects frequency, NOT voltage. You do not want to mess with RPM unless you have a reliable Freq. meter.

Voltage is usually adjusted thru voltage regulator but you will need a manual for specifics.

typically when a genny starts but dies when the run or start switch are released, the problem can often be traced to one of the safety switches or circuit. It's not too hard to troubleshoot when you have the wiring diagram.

thanks
would you have one or a servide manual available??

BEARVT · 10-19-2009, 12:02 PM

Quote:

Originally Posted by Marmot

Try this, it's from TFM

thanks, i'll give it a try. do you know if there is one device that is typical to fail?

Marmot · 10-19-2009, 12:44 PM

Quote:

Originally Posted by BEARVT

" ... do you know if there is one device that is typical to fail?

"Exclude the bits that won't stop it from working and you will have your answer, Grasshopper." (from a Chen Dynasty troubleshooting manual written by Okaie Yoo RonSoon )