Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

I have a onan 5.5 hgjad-2558b generator I have a code 31 for…

Customer Question
I have a onan 5.5...

I have a onan 5.5 hgjad-2558b generator I have a code 31 for overspeed the unit runs a while then smells like engine gets hot after 20mins with air filter out like its has blowby I took compression and has 160psi at both cylinders I even checked fuel pressure has 43psi,runs ok but after awhile it dies and wont start cleared code and comes back soon as starts after cool we don't use the gen part only for the boom this on a versalift boom truck,where should I go from here thanks

Submitted: 3 years ago.Category: Small Engine
Show More
Show Less
Ask Your Own Small Engine Question
Answered in 2 days by:
5/30/2015
Technician: Hank F., Technician replied 3 years ago
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15,903
Experience: Certified on Onan and Generac generators
Verified

Hello!
My name is ***** ***** I am going to assist you with this.

First, have you checked to make certain there is plenty of free air for the cooling system, as well as an unobstructed exhaust? Both the intake and exhaust on this unit are underneath, and must be kept isolated.

When the unit shuts down, have you checked to see if you are getting spark to the plugs while it wouldn't start?

Have you checked to see if the fuel pump is pumping fuel after the unit shuts down?

Connect a frequency meter to the unit, and start it up.

Monitor the frequency reading until the genset shuts down.

What readings do you get?

.

Ask Your Own Small Engine Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Curtis B. Your Own Question
Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 15,342
15,342 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

Curtis B. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

15,342 satisfied customers

have worked on and around most engine models for 35 yrs./Polaris ATV expert

Rick

Rick

Factory Authorized Trainer

4,218 satisfied customers

Outdoor Power Equipment technical trainer since 1990, covering eight states.

Jon K.

Jon K.

Small Engine Diagnostic Expert

2,995 satisfied customers

Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines

James W

James W

Small Engine Troubleshooting Expert

2,986 satisfied customers

7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

Vince O.

Vince O.

Small Engine Technician

2,902 satisfied customers

Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers

Wayne

Wayne

Engine Rebuilder

2,006 satisfied customers

many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines

RUSS

RUSS

SERVICE TECHNICIAN

1,723 satisfied customers

28 YEAR SERVICE TECHNICIAN

< Previous | Next >

Related Small Engine Questions
I just bought an Onan 5.5 EFI commercial rv style generator.
i just bought an Onan 5.5 EFI commercial rv style generator. It will run for up to 2 hours before shutting off or as little as 5 minutes. It will restart but only run for about 5 minutes. It gives err… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I own a onan generator, model no. 205lk-irv, serial no.
I own a onan generator, model no. 205lk-irv, serial no.(###) ###-#### I bought it for $250. the prevish owner said it hasn't run in 10 years. the problem I have with it is that it turns over real hard… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I have a 7.0 onan gas bran new just took out of box today it
I have a 7.0 onan gas bran new just took out of box today it is a efi with spindle starts and runs for a few a little bit a then dies out … read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I have an onan generator model ive repiaced the starter'
i have an onan generator model ive repiaced the starter ' starter solinod … read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I have an Onan gen set that is giving me intermittent
I have an Onan gen set that is giving me intermittent problems. Sometimes it wont stay running unless I hold the start switch down. It doesn't do it all the time, just once in awhile. I checked the co… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
Error code 47 on 5.5 HGJAD/2138J - had the generator at
error code 47 on 5.5 HGJAD/2138J - had the generator at dealer and he says there is no problem. now wont run and show error code 47 again. and we haven't used it since getting it back yesterday… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
Hello Hank, My name isXXXXX have a onan 5500 and it
Hello Hank, My name isXXXXX have a onan 5500 and it has all the common problems as most. Starts up and dies after 15-20 minutes with or without a load. Replaced filters, oil, fuel, pump works, replace… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I have an HGJAD fuel injected portable generator that is cutting
I have an HGJAD fuel injected portable generator that is cutting off sporadically. Every thirty minutes to every couple of hours. The Service code is "31" which the operator manual list as overspeed s… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
I have a Onan 5.5 Marquis installed in a 2010 Keystone Fuzion
I have a Onan 5.5 Marquis installed in a 2010 Keystone Fuzion that I just purchased. While running the gen the exhaust smells inside the unit. Searching I discovered that there is no tail pipe install… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
The cable from my generator has a blue wire along with the
The cable from my generator has a blue wire along with the ground, red, black and white. It has a solid ground that does not change when the generator is running or idle. What is this blue wire for. M… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
My Onan generator starts O.K. but as soon as I release the
My Onan generator starts O.K. but as soon as I release the start switch the engine shuts down. I think the fuel supply is cut off. The gen set is 30 years old.… read more
lwwade
lwwade
116 satisfied customers
I have an Onan gen set in a 1988 Allegro motor home I purchased.
I have an Onan gen set in a 1988 Allegro motor home I purchased. The generator mdl # XXXXX XXXXX NHE-1R/26100A. The generator works fine but when I disconnect it from the 12V battery supply, It dies. … read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
i have a onan emerald genset1 generator model#4obge-1r/26100c
i have a onan emerald genset1 generator model#4obge-1r/26100c sn#k850786361 it starts fine and runs for about 10 minutes and dies then wont restart unles you let it sit for awhile then it will start r… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
onan BGE model wont run after you let go of the start switch.
onan BGE model wont run after you let go of the start switch. I don't need or use the generator part; is there a way to buypass the voltage feedback to keep this moter runing so I can use the hydrauli… read more
Hank F.
Hank F.
Technician
15,903 satisfied customers
my onan gen. will start and run but only if you prime it first
my onan gen. will start and run but only if you prime it first and then it might run for 1 hour maybe and when it quits you have to prime it to get it started and it might run for5 min or20min but usu… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,342 satisfied customers
my RV has Onan 2004 2.8kw model 3KVC-83C 120V only 30 hours,
my RV has Onan 2004 2.8kw model 3KVC-83C 120V only 30 hours, just changed plug and oil. it's start right up, after warm up, running fine. but adding load either microwave or A/C then it's speed up/dow… read more
Expert
Expert
my onan 5500 marquis 5.5 kw generator will start and run from
my onan 5500 marquis 5.5 kw generator will start and run from the gen. start panel it will shut off from the remote button in motorhome it will not start from the remote button wiring is good from rem… read more
Tech4you
Tech4you
Electrician/Mechanic
Associate Degree
1 satisfied customers
Hello, I have a Ford class C RV about 26 years old, which
Hello, I have a Ford class C RV about 26 years old, which has an ONAN Generator that just began to leak gasoline. I can smell it and I can see it on the groung. (A little puddle). How do I disconnect … read more
Carey (Turtle) Moore
Carey (Turtle) Moore
Supervisor Fleet Maintenance
Vocational, Technical or Trade Scho
175 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x