Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

I have a 2004 J90PLSRR- when in gear, when the motor is

Customer Question
Hi, I have a 2004...
Hi, I have a 2004 Johnson J90PLSRR- when in gear, when the motor is running around 1000-1300 RPM the hot warning alarm will come on in water. If I reduce to idle, the warning will go off. When the motor is running at higher rpm, 2000+ the alarm never goes off and it appears to run fine. I'm thinking maybe a stuck thermostat or an impeller replacement?
Submitted: 4 months ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 5 minutes by:
3/18/2018
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,172
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

H​I Ryan, name is***** read what you wrote. That is typically a sign of a weak or broken impeller, not pushing enough water at slow rpms to keep up with engine RPMS. The impeller sits on a drive shaft, that drive shaft is directly connected to the engine crankshaft. If the engine is spinning at say 1000 rpms, the impeller would be spinning at that same rpm. That being said, the impeller is a wear and tear item, they have a 2 year life span whether you use the outboard or not. The impellers are rubber, and that rubber will get stiff, dry rot, and take on a memory just from the passage of time, so it doesn't matter if you actually use the outboard or not in regards ***** ***** impellers overall life span. It's also standard operating procedure to change those thermostats and flush everything while it's all apart as well. Has it been longer than 2 years since your last impeller replacement?

Ask Your Own Boat Question
Customer reply replied 4 months ago
The boat is new to me, so I'm not sure- but seems like something I should go ahead and have done regardless?
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Yes I definitely would have it done. These engine do need regular service. The impeller and thermostats need to be done every other year. The gear lube, greasing the prop shaft, changing all filters, and changing the spark plugs all need to be done yearly. The carbs typically need to be done once every few years. Since you just bought the boat, I would have it completely serviced, that way you know it's in top running condition. Also, if you are good at keeping records and keeping receipts, it will help you in the long run for when you go to sell this boat. Boats that have maintainence records always sell faster and for a better price than boats that do not. I do want to make sure you are happy with my service before you go. If you had a further or more specific question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the star you wish and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.

Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.

Thank you
Jason

Ask Your Own Boat Question
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Was there anything else Ryan?

Ask Your Own Boat Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a marine mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Jason Your Own Question
Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,172
18,172 Satisfied Customers
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

Jason 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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,172 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

< Previous | Next >

Related Boat Questions
I have 1989 GT 150 outboard that sounds an alarm (solid
I have 1989 Johnson GT 150 outboard that sounds an alarm (solid tone) when in gear and reaching 2000 rpms. Engine shuts off after about ten seconds of the alarm sounds. Do you know what is this indica… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 2000 mercury 150 hp saltwater series that will overheat
I have a 2000 mercury 150 hp saltwater series that will overheat when idleing in neutral only. Fine in no wake zones and when cruising at any rpm. Recently changed water pump and thermostats and clean… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 250 efi mercury 1999 and having overheating issue
I have a 250 efi mercury 1999 and having overheating issue at 3000rpm after 3 to 5 minutes of operation?? This has been going on for about a year we have tried everything , popped valves pulled the cy… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
my 2005 with only 29 hours runs great most of the time... at
my 2005 with only 29 hours runs great most of the time... at times during initial acceleration I get an alarm and the motor bogs down. If I try again it may accererate if I go very slowly with the pow… read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
2005 40 4-stroke. Motor cranks great, it will idle up to 2000
2005 40 4-stroke. Motor cranks great, it will idle up to 2000 in gear fine. after low speed idle then acceleration and planing the 13 whaler I get a solid alarm horn, and the motor cuts back. Once I i… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I want to know how to tell if my water pump needs replacing
I want to know how to tell if my water pump needs replacing on my 1992 2 cyclinder 50 hp Johnson model #VJ50TLETB. I bought a pump but have never installed one before. I am mechanically inclined, as I… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
i have a yamaha sx 210 at the end of last season my right engine
i have a yamaha sx 210 at the end of last season my right engine overheat light started to come on, i never ran it hot I shut it down. it never overheated right away, always after running for over 30 … read more
Jeremy R
Jeremy R
1,069 satisfied customers
I have a 2005, 150hp xr6. I noticed a reduced pressure on the
I have a 2005, 150hp xr6. I noticed a reduced pressure on the water pressure gauge the last few months. Finally when I idle the high temperature alarm goes off. When I running fast it doesn't. I repla… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a yamaha 90hp which runs well but the engine cuts back
I have a yamaha 90hp which runs well but the engine cuts back to idle every time the motor reaches 4000 revs. It does this from a hot or cold start. The local mechanic has cleaned the water intakes ho… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a Mercury 2006 model 25 ELPT, Serial Number Or127690.
I have a Mercury 2006 model 25 ELPT, Serial Number Or127690. On the initial startup, the motor runs normally out of the marina. After opening the throttle it will run normally, a short distance and th… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I just bought a 2005 nitro boat with a 2005 Mercury 150 hp
I just bought a 2005 nitro boat with a 2005 Mercury 150 hp xr6. The motor looks brand new, cant be too many hrs on it. Anyway, I put it in the lake yesterday. It started right up but it took a while f… read more
Jason
Jason
Associate Degree
210 satisfied customers
Baja islander 252 islander, 454 magnum, bravo 1, over heated
Baja islander 252 islander, 454 magnum, bravo 1, over heated due to impeller issue, alarm went off, power reduced, lost approx 10 mph just before it throttled itself back. I had the impeller fixed, no… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
704 satisfied customers
mercury 60 hp.efi bigfoot 4 cycle 4 cyl. 2004 model Heat
mercury 60 hp.efi bigfoot 4 cycle 4 cyl. 2004 model Heat sensor alarm coming on.Psi water pressure gauge not working only under air pressure.Flushed system with water and air pressure.Replaced water p… read more
Jeremy R
Jeremy R
1,069 satisfied customers
I have a johnson 2005 90hp saltwater edition. I got deep in
I have a johnson 2005 90hp saltwater edition. I got deep in some grass and the trolling motor battery died. I ran the motor to get out of the mess and the water intake got clogged for a minute. Right … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 1994 200hp. evinrude vindicator. i was running the
I have a 1994 200hp. evinrude vindicator. i was running the boat wide open for about 8 min. and when i shut it down to and idle an alarm went off. it was a constant alarm. when i started the motor bac… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Hello, I have a 40hp Johnson outboard.I had a tuneup on
Hello, I have a 40hp Johnson outboard.I had a tuneup on it one and a half months ago and it has been running great. A couple of nights ago I took it out and the over heat alarm started going off and t… read more
The Man on the Dock
The Man on the Dock
Marina Owner, Operator
Vocational, Technical or Trade Scho
74 satisfied customers
We have a 1989 120 Evinrude outboard. We have just installed
We have a 1989 120 Evinrude outboard. We have just installed new thermostats, and the telltale is strong. When we drive at moderate to fast speeds, the alarm comes on and the motor stalls. What should… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have 92 150 hp Johnson OB with jet and the alarm sounds
I have '92 150 hp Johnson OB with jet and the alarm sounds with a long alarm usually at around 4000 RPM but when I back off it stops. It is intermittent however. A friend thought it was related to a f… read more
FieldServiceTech
FieldServiceTech
Vocational, Technical or Trade Scho
146 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