24 hp onan

[zanegrey]

hey giys,

i have just run accross a 24 hp onan twin cylinder electric start horizontal shaft engine.

i was wondering if n e 1 has used such a big engine for a cart..


thanks

 

[anderkart]

Is it one of the older Onan P224 models? I couldnt find this engines weight listed separately but it seems some of the complete Generators that came with the P224 model engines weighed in at 600 lbs... I wouldnt be surprised if one of these engines were somewhere in the 150 to 300lb range...

Something else to consider is what size and type of PTO shaft your motor has. Does it have a tapered output shaft?

 

[zanegrey]

this engine came from a bobcat lawn mower..

i can pick the engine up so maybe it is 100 pounds..

the shaft is not tapered..and is 1 and 3/8

the shaft has on it a pulley and a drive pulley that is slotted..

the production date is 1975.
the model number is nhb-ms/3143c..

thanks

 

[Kaptain Krunch]

Go for it, no such thing as too big.

 

[freakboy]

go for it man. those onans sound great with straight pipes!

 

[zanegrey]

i have a 9 hp vangaurd on my manco dingo..
it will go 50 with the torque convertor ..

i wonder what kind of performance the onan would give...

 

[freakboy]

wheelies

 

[zanegrey]

well ,
today i took some of this onan apart to see what shape it is in and wow...

there was a varment who had since vacated but left alot of his worldly possesions..

i still will have to spray it down ..every fin , nook and cranny was filled with nuts or seeds and stuffing material..


so i have it bare bones..heres several pics..

i am not getting spark ..

there is a box that looks like it has cooling fins on it in the fourth pic..
does any one know what it is??
i was kind of thinking it was the low oil shut down apparatus..

i have checked all connections and cleaned up the points ..

i made sure it is getting power to coil and thru to points..

my first thought was condensor..is there any way to test the condensor?

i did notice that the points snap with a spark yet no spark at the plugs..

any help is very much appreciated..

thanks

 

[zanegrey]

if you click on the pics it will come in closer for you...

 

[kazkepox]

that thing is cool, I like the fact it has a n oil filter lol, I wonder if my briggs V will have one of those...

 

[anderkart]

I dont know of any bench test for condensers but take an ohm reading on it and post your findings just for giggles.

Here's another easy test: connect up a regular 12 volt automotive test light and first make sure your getting power to the ignition coils positive terminal, then probe the coils negative terminal while cranking. If your getting a good strong flashing light but absolutly no spark chances are your coil may just be defective.

 

[zanegrey]

i will do that ..

do you think the points would spark if the capacitor was bad ??

i did the circuit testing .. the light is bright on the power in side but on the side the leads to the points (or out side ) it only lights up a litlte and then cuts out when the breakers contact..

do you think this is indicative of a bad coil ?

thank you for responding to my questions..

 

[anderkart]

As a test, disconect your condenser wire and see if you get spark. If not, do the test light procedure again now.

Is your low oil shut down wiring still connected to your ignition?
If so, I just wanted to confirm the engine oil level is full, right?

 

[zanegrey]

i will try that (the condensor)

the oil is at the correct level..

if that box is the low oil shut off it is not connected to anything right now..

i think i may have reversed the coil power wires..

i will switch them back tomorrow ..

 

[anderkart]

i think i may have reversed the soil power wires..

i will switch them back tomorrow ..

Try that first.

 

[zanegrey]

i switched them ..to no avail..

i pulled the condensor and
used the light test and pretty much got the same results..

when the points are open the light does not come on (negative side) and when the points are closed the light is on but not as bright as a positive to negative light...

 

[anderkart]

when the points are open the light does not come on (negative side) and when the points are closed the light is on but not as bright as a positive to negative light...

Something strange is going on here, your test light should blink off as the points close. (negative side) The points/condenser should simply ground the negative side of the coil and trigger a spark each time.

Are you hooking your test-lights alligator clip to ground or positive?

Or do you have your +/- battery cables hooked up backwards at the battery by any chance???

(its normal for the test light to apear dimmer on the negative side because of the resistance through the coils windings)

 

[zanegrey]

i hook up the light to negative (coil )which go to the points .

then i put the other lead to ground..

i think, when the points contact the light comes on ..


it is not as bright as on neg side as positive side..

i am using a passive circuit tester..

 

[Gearstix]

I almost had a very similar engine. We got it running, and it ran awesome. On one cylinder. We could not get the other cylinder to fire, and it seemed as it had no compression. I'm pretty sure we had spark cause we checked it.
It uses a coil like an old ford I6 has but with two positives, I think. The ford one won't work, we tried.

I wish I could've got it. I'm surprised its that big of a motor.
It sounded effing amazing though, even on one cylinder.

 

[BriggsTwins]

hmm, well check for a broken wire or something, crank it during the night and look for sparking. thats the only way i found a split wire