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The Onan On My Case 446 Is Acting Up


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#1 Delmar OFFLINE  

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Posted August 12, 2012 - 07:58 AM

Ok, I haven't seen this one before. Maybe someone else here has. The 16 hp onan on the 446 runs fine does not smoke has no problems-usually. Here recently when I went to start it I would just hear a squeal and it turned over real slow or not at all when I turned the key. The first time it did this I recharged the battery, tried again, nuthing. Then I took off the starter, checked it out it spun like it was supposed to I thought, so I put it back on and the same thing happened. So then I turned the flywheel backwards about 2 teeth worth and turned the key and it spun correctly and started right up, ran good, no problems. Next coupla times over the next few weeks it started up right and so on, then it finally did it again. So I got out the screw driver again and turned the flywheel backwards again just a little and then hit the key and it fired right up, no problem. Any idea what is going on? BTW, it was about 105 degrees outside the first time it happened.

When I got the tractor the solenoid was bad so I replaced it. It is ok now.

#2 KennyP ONLINE  

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Posted August 12, 2012 - 08:36 AM

I would say the starter is about ready for a rebuild. Which Onan is this? Some require the starter to be set just so-so to the flywheel.
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#3 mjodrey OFFLINE  

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Posted August 12, 2012 - 08:50 AM

That would be my guess too,the started.
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#4 Delmar OFFLINE  

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Posted August 12, 2012 - 08:59 AM

I thought it was the starter too, but the one that was on it was only 6 weeks old. I did order a new starter and now it is on it, and that is when I discovered the turning the flywheel back. It may just be an alignment issue. I will keep trying adjusting that. Thanks guys.

Edited by JBBR, August 12, 2012 - 09:04 AM.


#5 Delmar OFFLINE  

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Posted August 12, 2012 - 09:07 AM

Wow, mjodrey, you are really close to the 10 K posts mark. congrats!

One more thing, and I don't know where to put it on the gtt forum, I picked up a parts tractor this week and the po gave me the manuals for it too. It is a operators manual for John Deere 200, 210, 212, and 214 lawn and garden tractors. Also got the manual for the 39 and 47 rotary mowers. I already have a parts catalog for John Deere 65, 66, and 68 riding mowers and a operators manual for 108, 111, 111H, 116, and 116H lawn tractors And a manual for a John Deere 33 intergral rotary tiller, If anyone needs a copy of any of these, please let me know.

Edited by JBBR, August 12, 2012 - 09:18 AM.


#6 olcowhand ONLINE  

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Posted August 12, 2012 - 09:14 AM

Yes, sounds like alignment. The starter drive will sometimes hang up with the teeth out of whack. My old SS16 Suburban used to do the same thing. Turning the engine backwards kicks the misaligned drive out to where you can give it another try. Most times they do fine, but when they hang, it's just an electrical squeel.
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#7 olcowhand ONLINE  

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Posted August 12, 2012 - 09:15 AM

BTW....the ONLY Onan model I've ever had this happen on is a BF, 16hp model.
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#8 KennyP ONLINE  

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Posted August 12, 2012 - 09:35 AM

Here is a page from the B43-B48 service manual for starter adjustment. I didn't see it in the manual for yours.
Onan Starter Adjustment.jpeg
At least it will give you somewhere to start the adjustment. Usually, the upper mount hole is slightly elongated to allow the adjustment.
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#9 nbent OFFLINE  

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Posted September 15, 2012 - 12:02 AM

i don't know what modle engine yours is, but on my jd 318 that had the b43g engine in it this happened while it was running so i shut it off and left it for a few days. then the next time i started it it did the same thing and then it snapped the connecting rod.

#10 CASENUT OFFLINE  

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Posted September 15, 2012 - 12:36 AM

If this is similar...which I'd assume it is to my Ingersoll 446...there are 2 bolts for the starter, one is a pivot and the other is an 'adjuster, you have to loosen em both... then position the starter a little short of full engagement. Most likely the squeal is the gear itself hitting the flywheel...so just back it out say 1/4" and I am pretty sure this will resolve your problem...GL and post up

#11 KennyP ONLINE  

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Posted September 15, 2012 - 04:04 AM

Here is the Onan starter adjustment:
Onan Starter Adjustment.jpeg

#12 Delmar OFFLINE  

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Posted September 15, 2012 - 04:39 AM

Yep, it was just starter to flywheel alignment. I re-adjusted it a couple of times before it was just right. Thanks guys!




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