416H Shuts down when hot

[Furious 23]

Bought a 416H with an Onan P216 this weekend at the big show and it shuts down after it gets hot. Seems to sputter out like it’s out of gas then shuts down completely. Will crank for a while and restart and idle only with the choke full on. After it sits for an hour or 2 it will start up and run normally until it gets hot again. Any ideas?

[Ed Kennell 38,342]

First step it to loosen the fuel tank cap.   Just in case the vent is clogged.

[JimSraj 430]

If the tank cap is venting ok, You might check for spark when it shuts down. I had the same thing happen on a 1267. Turned out the coil was bad. 

[Furious 23]

Thanks.  Should have mentioned in the original post.  I tried the fuel cap already and replaced the fuel pump since it was losing prime after sitting.  Is there a way to test the coil without running it until it stops?  Also, any suggestions on where to get parts for the P216?  Thanks.

[lynnmor 7,323]

Losing spark when hot and then regaining it after cooling is often the ignition module.  The only good test for that is an immediate check for spark after the shut down.  Since yours sputters as it stops it might be fuel related.

[Furious 23]

I’ll check for spark after it shuts down next time.  What’s weird is that it will start back up after some cranking but only idle with full choke.  I took the air filter off and gave it throttle when it was idling and it died immediately.  Also saw some fuel spray from the carb.  Still sound like the ignition module or a weak coil?

[Ed Kennell 38,342]

Clean the breather. and check the muffler for blockage.

[lynnmor 7,323]

I would pull the carb and do a thorough cleaning since the word choke came up again.

[Furious 23]

Thanks for the replies.  I haven’t gotten a real chance to work on it the last few days.  Just moved back to the states from Italy with the military and all my tools are still in storage.  I’ll take your advice, and give the carb a good cleaning.  Also want to ask if you think a bad 9 pin connector could be the culprit.  I started it up yesterday and moved the 9 pin connector around to see if I could get it to do something and it cut out several times as I was moving it.  I checked the plug, and a couple of the pins seem….browned.  Not burned, but they’re off color.  I opened the pins up a bit with a screwdriver to get a better connection, then started it up and moved it around.  No stalling this time.  Could it be that when the connector got hot from running it started to cut out?  Either way, when my tools finally get here, I’m going to cut that connector off and replace with heavier duty, weatherproof connectors.

[Ed Kennell 38,342]

Sounds like you found a problem.  May not be the only problem, but a good place to start.

 

Oh, welcome home and thank you for serving. 

Edited June 28 by Ed Kennell

[lynnmor 7,323]

That connector can do some strange things, it belongs in a radio and not in a tractor.  We should have mentioned it along with the troublesome fuse holder.  The choke thing led me to think carb.

 

You can run a bypass wire around the connector to take the charging load directly to the battery cable on the starter solenoid.

[Furious 23]

Thanks Ed.  Good to be home.  Not settled yet, but we’re getting there.  

 

I agree, those pins look like they belong in a car stereo, not on a 20 amp charging harness.  I was thinking for now, doing exactly what you suggest @lynnmor, just cutting the charging wire out of the connector and running it direct to the battery.  Not sure what else on the tractor would draw much more than a few amps load otherwise.

[lynnmor 7,323]

3 hours ago, Furious said:

I was thinking for now, doing exactly what you suggest @lynnmor, just cutting the charging wire out of the connector and running it direct to the battery.  Not sure what else on the tractor would draw much more than a few amps load otherwise.

 

If you bring up the wiring diagrams for the first couple of years of the 520 tractors, you will see that they were wired that way using an inline 30 amp fuse.

 

[Furious 23]

That makes much mores sense to me.  Thanks. 

[Furious 23]

Well, had some time today and I went out to do a little troubleshooting on the 416. I’m still stumped. After sitting for a few days she started right up. Ran well for a few min at idle, then at full throttle. Got on to run around the yard and it shut down within a few feet. It’ll start back up and only run at idle with full choke. Engine wasn’t hot and it’s only 75deg outside. I think I fixed the 9 pin connection for now.  I’m betting that it’ll start right up in a few hours and run like a top for about 10 min, the. Do it all over again. Haven’t gotten a chance to really take anything apart yes as I’m still waiting for all my tools to show up. 

[rmaynard 15,547]

Did you open the gas cap?

[Furious 23]

Tried opening the gas cap. 

[Furious 23]

Really need some help. When I picked up a 416h a month ago it was running well, but would shut off after about 10 min. Would only start and run when fully choked. If I gave it throttle, it would immediately die. It’s since progressed to only running while fully choked. It runs rough and sounds like it has a miss. Give it any throttle at all and it dies. It has a new carb, new fuel pump, new fuel lines and filter. Gas cap vent isn’t clogged. I cleaned the spark plugs as well. Engine has 1100 hrs and judging by the amount of carbon on the valves when I had the manifolds off, I’d say it’s never been de-carbed.

[lynnmor 7,323]

Check the compression and report back.  At what point did you install that new piece of junk Chinese carburetor?