Need Help with Robin Engine

[Tak]

Pairodime,

Been having the same problem with our 422. Always starts when cold and will run for a while until hot. Then will die and will be practically impossible to start unless it sits for 5-10 min. Suspected vapor lock so rerouted fuel line. Still had the problem. Area where fuel line attaches to carburetor gets extremely hot from engine air (not even able to leave my hand there for any extended period). Fan would definitely help blowing over that area.

However, even after insulating the fuel line, engine still cut off while the fuel line was not hot at all.

Solenoid cut off switch had wire looped back on itself and tied to body. Wire insulation was not cut but was discolored where it contacted the solenoid. Appeared to ground itself when insulation heated up thereby shutting off the solenoid (fuel flow). Removed wire from solenoid body and problem seems to have gone away.

Conclusion - inadvertent ground

 

[Schultz]

Wow only 900 hrs. It should last at least twice that, especially since they market this engine as a premium engine. They also started building the engines for Onan, which has a great reputation for long lasting engines.

I'd like to hear Jack's company explaination of engine life or the real mean time to failure number????

 

[MossRoad]

Good troubleshooting. /forums/images/graemlins/wink.gif

 

[landscapercarl]

When the repair shop called Robin to get the parts the reply was we havent had any problems at that end of the engine.
He asked what problems they have been having and they quickly said none. The rest of the motor was fine just the rings and valves he cylinders were within the tolerances.
The repair shop was surprised that the motor didn't last longer. We have had alot of kohler that last years with no problem ususally the machine wears out and the motor still keeps going.

 

[duane]

Carl,

Just curious if you could elaborate on the rings froze and valve shot problem.

Did you experience something breaking, or poor running, or excessive oil consumption

Were the valve seats dislodged, or just beat up.

Did the repair shop indicate if it was a lubrication problem, valve adjustment problem?

The 2422 seems to have less ventilation than the PT422s, so I can see how it would really heat up in the engine bay.

Thanks for any information, just trying to learn up pick up whether we should be doing ant type of accelerated or different prevent maint.

Thanks
Duane

 

[landscapercarl]

The exhaust valve froze open on one cylinder and the rings on both pistons were froze they wouldn't budge. We use synthetic oil and the repair shop said using regular oil they would have froze sooner. We have only one person operae the machine and he opens the engine cover as soon as he gets off the seat so the heat can get away. As I said we have probelms when they reformulate the gas in the fall with boiling the fuel and the machine wont run. we use this machine commercially and when it runs its great but would I get another don;t know right now there are alot more alternatives today. We are taking about a fan and more holes for the heat to escape since there all on the sides and heat rises were going to try some on top.

 

[Schultz]

It's too bad Robin didn't offer to take the engine. I imagine their R&D group could have learned something it and actually figured out if it was heat or oil or a combination of related failure.

 

[JackRobin]

Hello Everyone,

I have been missing from the forum for a while, I've been busy implementing an online warranty processing system, I still will not be visiting the forum as often as I used to, but I'll try to answer at least a few questions.

In reply to the first gentleman that started the thread, seems like you might want to upgrade to the higher output fuel pump. We use higher output fuel pumps in the 25HP motors (EH72). We've included bigger diaphram spring in this pump for better performance. Please let me know if you have your engine up and running again, I think I helped Terry resolving your issue over the phone, I'm just not sure if it was your machine or not.

Regards,

Jack Gawecki
Robin America, Inc.
Technical Support Dept.
800-277-6246

 

[JackRobin]

</font><font color="blue" class="small">( Wow only 900 hrs. It should last at least twice that, especially since they market this engine as a premium engine. They also started building the engines for Onan, which has a great reputation for long lasting engines.

I'd like to hear Jack's company explaination of engine life or the real mean time to failure number???? )</font>

According to the EPA regulations we are requried to stand behind 3000 operating hrs. on the engine, but that doesn't mean that the engine will fail after this time. I was discussing severe wear of parts with a customer in Alabama that had our engine on another hydraulic application tractor. With over 6400 hrs. within a year and a half, he called me demanding warranty on the wear of rings and some other parts, I've declined it, telling him that he's definately is getting his money's worth.

Regards,

Jack Gawecki
Robin America, Inc.
Technical Support Dept.
800-277-6246

 

[MossRoad]

<font color="blue"> 6400 hrs. within a year and a half, </font>

YIKES! /forums/images/graemlins/smile.gif That's 24 hours a day strait for 267 days.

Just out of curiosity, do your warranties go by years and/or hours like automobiles go by years and/or miles?