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"BRUTUS" my Onan 2.5LK failed.


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  #1  
Old 09-08-2017, 06:17:43 AM
Esteban32696 Esteban32696 is offline
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Default "BRUTUS" my Onan 2.5LK failed.

I call my 2.5LK," Brutus " for obvious reasons . I have owned it about 15 years & it has served me well. I live in North Florida, & for a final check of everything before Irma comes for a visit, Brutus failed to start. I used it about 2 months ago, when I lost power , with no problems.
Checked it out & no fire to the plug . Checked points & they look awful. Filing didn't help these. There is no place,, or time to do anything else to it, so I will have to get by with my little Honda generator.
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  #2  
Old 09-08-2017, 07:04:12 AM
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lokay5 lokay5 is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

A bad condenser can wreak havoc with points. Try any condenser you have around that'll fit. You may be pleasantly surprised...or not.
Best wishes and good luck down there. (Glad you have the Honda.)

"Jungle Jim" Lieberman BRUTUS http://www.leblogauto.com/wp-content...s-liberman.jpg
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Old 09-08-2017, 08:05:52 AM
David C David C is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

Hook a test light to ground and while cranking, check for 12 volts at the points. If the light flashes while cranking, I would try a condenser as Lokay suggested. If you get a steady light, you have a set of points that are not completing the circuit to ground. If there is no light, check for power at the positive side of the coil while cranking. If you have power to the positive side of the coil, you have a open primary winding in the coil or a shorted out condenser or a pinched wire between the coil and the points. Coils do fail, but it is not a common failure. Hope all goes well with Irma.

David C.
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Old 09-08-2017, 01:02:32 PM
len k len k is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

I like to sand points with good sandpaper, ~ 180 grit. Fold a strip in half and drag thru the closed points.

Condensers come in at least 2 different capacitance's, one for points (on points side of coil), other for just radio noise RF suppression ( on +12V side of coil) , don't need the RF one for engine to run. So if you can get a few of condensers just try them one at a time, they basically stop the big arcs at points ( ideally points shouldn't arc, arcing pits points)

Good to put condenser by points. But I think it just has to connect between ground and to wire from points to coil, so you can put it anywhere that's convenient. Likely good to keep it dry.

If can't buy a condenser maybe can scrounge one from a lawn mower that uses points. Got a feeling they are all about same capacitance value.


Best to use condensor for an engine. But If others can post it's rough capacitance maybe you can get capacitor from radio shack, mounting won't be same, they likely only have 2 bare wires, but in an emergency . Think voltage rating is ~ 300 or 500 volts ???, might be 3-5 mfd (3-5 uf) capacitance , non-polar (not electroytic cap = not aluminum can). Condensor is a capacitor., just the old name for it

Last edited by len k; 09-08-2017 at 09:57:26 PM.
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Old 09-08-2017, 09:53:09 PM
len k len k is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

Just got a pm from a Staker, he says

"points caps are 0.3uf to 0.5uf , notice the decimal point"

so if you go to radio shack or scroung a cap from an old TV, ect that and a voltage rating of at least ~ 300 V should work.

-------------------------

Looks like points cap is ~ .3 MFD ( MFD = uf) ~ 300 Volt rating ( more voltage is ok) see this old thread. See post 13 !!!!!! Also end of post 12.
https://www.smokstak.com/forum/showt...ghlight=points
.

Last edited by len k; 09-09-2017 at 09:59:02 AM.
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Old 09-09-2017, 02:39:45 AM
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

Re -RadioShack -

https://www.usatoday.com/story/money...eft/102372912/
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Old 09-09-2017, 06:35:34 AM
Esteban32696 Esteban32696 is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

Quote:
Originally Posted by lokay5 View Post
A bad condenser can wreak havoc with points. Try any condenser you have around that'll fit. You may be pleasantly surprised...or not.
Best wishes and good luck down there. (Glad you have the Honda.)

"Jungle Jim" Lieberman BRUTUS http://www.leblogauto.com/wp-content...s-liberman.jpg

I like your " Brutus " better than I like mine !!

Thanks for all the help !! I am sitting tight right now expecting the storm to hit late Sunday. I won't work on the generator til all this is over. It came out of a 1968 motorhome & I have gotten my money's worth out of it. I love listening to that 1800RPM machine run.
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Old 09-09-2017, 10:01:38 AM
len k len k is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

TIP ..... if the cap you salvage from a TV or radio shack has a +/- or positive/negnative markings on it then it's a polarized type cap and I wouldn't use it as cap will likely die, because in use it will see both polarities ( ei will be reversed polarized 1/2 the time). But in an emergency maybe it will last long enough?? Might fail in a few minutes or days, don't know.
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Old 09-09-2017, 10:07:35 PM
dracer dracer is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

my 6.5 quit during a storm , the condenser went bad , in a pinch I used the one on the pos. side of the coil and worked until I could get the proper one
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Old 09-10-2017, 08:19:37 AM
Esteban32696 Esteban32696 is offline
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Default Re: "BRUTUS" my Onan 2.5LK failed.

Someone suggested a conversion to electronic ignition, but I don't know anything about that. Is there a " kit " for doing this ?
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Old 09-10-2017, 08:38:10 AM
AngrySailor AngrySailor is offline
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Default Re: " BRUTUS , " my Onan 2.5LK failed .

Quote:
Originally Posted by len k View Post
TIP ..... if the cap you salvage from a TV or radio shack has a +/- or positive/negnative markings on it then it's a polarized type cap and I wouldn't use it as cap will likely die, because in use it will see both polarities ( ei will be reversed polarized 1/2 the time). But in an emergency maybe it will last long enough?? Might fail in a few minutes or days, don't know.
Or...If you have two polarized caps of double the required value, wire them in series -/- or +/+ to simulate a non polar cap
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Old 09-10-2017, 08:38:49 AM
JohnnyC JohnnyC is offline
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Default Re: "BRUTUS" my Onan 2.5LK failed.

Quote:
Originally Posted by Esteban32696 View Post
Someone suggested a conversion to electronic ignition, but I don't know anything about that. Is there a " kit " for doing this ?
I don't know the specifics for a conversion for a 2.5LK, but if you had a 6.5NH like dracer or similar genset it can be done using an OEM Onan electronic ignition and still retain the OEM points setup as a redundant ignition backup system in case one fails. I did it to my NH with excellent results and switching between the two ignition systems is only a flip of a toggle switch.

JohnnyC
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Old 09-10-2017, 08:56:55 PM
dracer dracer is offline
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Default Re: "BRUTUS" my Onan 2.5LK failed.

in fact I did replace my cond with a electronic from kirk engines , two other ones that I picked up I put the gm ign module on them thy work good, the info is on the form on how to do it
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Old 09-10-2017, 09:24:11 PM
len k len k is offline
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Default Re: "BRUTUS" my Onan 2.5LK failed.

Alternate electronic ignition systems, convenient list of links
https://www.smokstak.com/forum/showthread.php?t=167037
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