Nikki carb/ spring fell out lower end.

[Salvinni 9]

I have a 520 that started surging, took the carb off (whole thing).

Its a nikki carb.

When I opened it a spring w/ a bb on it fell out of lower half.

Didn't get a pic of that before it happened, now I don't know which hole it came out of, or which goes in first bb end or spring end.

Ill get a pic up of lower end w/ hole pattern, maybe some1 could pt it out.

Soaking now.

Soak can says 15- 20 mins.

Ill give it an hr and check it.

Really wanted to go overnight, but I don't know if there are any aluminum parts in carb.

Ty.

Sal.

[Martin 2,133]

what year is the tractor?

does it have a accelerator pump on the side? if its an emissions carb it would have a pump. I'm not sure if the emissions carbs have a spring and ball like you mentioned and where it would come from. i might go study some parts list and see what comes up. i have an emissions carb in pieces down the garage but i don't think the bottom is any different....let me go check

[Salvinni 9]

 

There is the image of lower end.

One of them holes is where the spring w/ bb on it popped out.

Also I just noticed I didn't take that turbine looking thing off before I soaked it.

My thumb is on it.

 

 

Please tell me there was no plastic in there.

[HokieAg07 129]

I cant recall where the spring and ball go, I could take my old one apart if no one has a quick answer. 

 

What your thumb is on is the accelerator pump, used on the emissions carb like you have. Unfortunately, there is a diaphragm and spring inside there! 

[Desko 610]

If you look at the top part of the carb there is a short tab on the left if it was up side down the pointed part pointing away from you it goes on there an if you have the pointed part of the carb pointed away from you it go on the center right in front of the accelerator pump tube that you see in the center I'm hoping this is making sense it goes in the hole by the throat of the carb at the very center hope it helps. I don't have my carb apart but that is where I believe it goes no grantee

Edited May 12, 2014 by Desko

[Salvinni 9]

Thanks Desko, yes it went on the short node that came out of upper and inserts in lower.

Hoakie, got it back together im gonna take a crap shoot on that diaphragm, if its shot, ill get the new part or kit.

Was gonna pick up a kit anyway for a later time, heard parts are getting scarce?

whats up w/ the lines in words.

Edited May 12, 2014 by Salvinni

[Martin 2,133]

i would pull the accel. pump apart and make sure the diaphragm isn't damaged from the soaking. also pull the idle tube and clean that as well. make sure all the little holes and the inside of the tube are free of any junk. use a welding tip cleaner. 

 

 

this stuff can make you go crazy if you don't pull that tube and it has crap inside. you will never get rid of any surging at low and mid. 

 

 

parts are available from a few sources....

i use onanparts.com they are the most reasonable for new parts......

Edited May 12, 2014 by Martin

[dennist 139]

I think you may have this all set, but this pic may help if still not sure...

[Salvinni 9]

Thanks Martin, your right, I do need to check the diaphragm while its off.

Thanks for the advice on pin I didn't know it was removable.

I put the upper and lower back together last night.

I see u have fuel in lower to float the floats.

Shoulda done that, floats kept falling down and needle kept sliding off.

When I was putting it back together, the needle area of the float part wouldn't seal w/ out screws.

I assumed that bent clip is meant to bend when screws tightened.

Ima redo it w/ some gas in it.

Also the welding tip cleaner, awesome tip there. couldn't find nothing here to fit just blew it out.

Thanks for the advice and photos.

 

Yep I got it, thanks dennist.

Edited May 12, 2014 by Salvinni

[KATO 115]

Welcome to , The lines through your post can be removed by

clicking on or "un hi-lighting" the "strike through" button at the top of the box that opens up when you start your post.

it looks like this  S  and is beside the Underline button.

[Salvinni 9]

Well, I didn't think this would be a 2 day thing.

I'm finding out very fast no1 seems to no crap bout parts, except on this site.

Even my trusted dealer where I bought it.

They couldn't even get a kit.

They sent me to a cummins place that could buy onan.

Wanted kit and new Diaphragm.

I was told well, its one of these 3 kits, u feeling lucky?

He didn't have a clue on diaphragm, said it wasn't on onan list and it was prob put on by toro after the fact.

Anyway here is the pic of diaphragm that im pre sure I wasted in soak.

Is it sposed to be wrinkled? maybe it wont matter w/ spring.

 

 Found accelerator pump kit online, some welding shop.

It is an onan part btw.

Thanks

Edited May 12, 2014 by Salvinni

[Desko 610]

Your best bet for parts will be at onanparts.com as they have the kit you need

[Salvinni 9]

I wanted to go w/ onanparts.com

But the dude is out fishing, wont be back till 16th. cant wait that long.

 

 

Found this. Ill c if on site somewhere if not ill start it in new thread.

http://home.comcast.net/~lyon.family1/WheelHorse/Onan_Engine.pdf

[Martin 2,133]

you will find that the diaphragm is usually wrinkled, result of it being subjected to movement in and out. what you need to do is work out if its any good. if the material looks like there is no damage and you can hold a bright light on one side of it and not see any pin holes or tears in it, i would guess you didn't damage it. most carb cleaners available these days won't eat up anything, at least not the stuff you want them too anyway. just make sure you rinse out the parts in the pump area.

 

from my experience with buying parts, onanparts.com is your best bet, if Tom is away, that makes it hard to get what you want. there are others out there, rv places usually carry onan generator parts. if he will be back on the 16th (Friday) order early and he may have it shipped same day or at least Monday and you will have your parts before the middle of the week.

 

One of the down falls of Onan engines (and Wheelhorse tractors in general) is that parts aren't usually available immediately, its an order and wait game, find someone who is reliable and just deal with the down time. many guys on here stock up on parts so that minimizes down time. i always buy more than i need of most stuff or keep parts that are good but maybe not cosmetically perfect on hand for workers that are needed to use on a regular basis. Im more upset about prices of parts these days than the amount of time it takes to get them.......

 

your best bet for info on these engines is here or weekend freedom machines forum http://www.weekendfreedommachines.com

join up and read till you drop, the guys on there are knowledgeable and have dealt with almost any situation with these engines. Tom has a lot of info on the onanparts.com website as well.......

 

our manuals section has that file and a whole bunch more. 

 

the John Deere manuals TM1590 and CTM2 are also very good for Onan info.

Edited May 12, 2014 by Martin

[Martin 2,133]

Part numbers for what kits you need are probably.....

 

Onan 146-0649/146-0658 Accelerator Pump Repair Kit P Series (146-0658)

Onan 146-0650/146-0657 Carb Repair Kit P Series                       (146-0657)

 

without the carb part number i can't be 100% on that though........

Edited May 12, 2014 by Martin

[Salvinni 9]

So I put the 520 back together w/ the parts I received.

Crossed fingers just for a start, got the start and a smooth running onan.

Ran r's high and low, no more surging, its fixed!.

However for first 3 mins or so it blew white smoke, first time ever.

That went away so I shut it off.

Looking down I c oil pooling on grd.

Pop hood and my air filter area has bout 1/4 inch oil in it.

Needless to say it made its way to my fresh cleaned carb.

The air filter was just saturated.

When I put air filter pan back on top of carb(for the rebuild) it was a ***** getting the crankcase breather tube in pan, I really had to push down.

Im wondering if I jacked that unit now cause that's where the oil was coming up from.

Started it again w/out air filter on and no oil was coming up however I did not go carzy w/ the rpms.

I put my finger on it while running and it had somewhat suction.

Maybe I pulled it to far into air housing and when put lid on it smothered tube?.

Iono.

[Martin 2,133]

I would pull the breather and look at the filter mesh and the check valve(3 plastic balls setup) and make sure that is working properly. Mesh might need replacing or just a clean and reposition so it can filter oil from the crankcase pressure.....

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