Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

This answer was rated:

Hi, I have 2x Cat C12 's in a cruiser the engines are several…

Hi, I have 2x Cat...
Hi, I have 2x Cat C12 's in a cruiser the engines are several years old but have only 80 hours but oil pressure warning comes on . Replaced sensor ,no change. oil and all filters changed Cat 15 w 40 used
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 2 hours by:
1/6/2015
Technician: Cat Man, Cat Engine Expert replied 7 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified
Hi. Thanks for asking your question and requesting me. I will try and help you out.
Unfortunately it sounds like a real low oil pressure problem. If the sensor has been changed along with the oil and filters and the warning is coming on. I assume there's a low oil pressure problem.
Low oil pressure can be caused by several things.
The engine oil bypass valves are open.
The oil pickup tube has a leak or a restricted inlet screen.
The engine oil pump is faulty.
Engine Bearings have excessive clearance.
I am sorry. I wish I had better news.
Please reply back if you need more help or have more questions. I am happy to assist.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 7 years ago
Hi. The cruiser has 2engines and while one isn't giving warnings it also is quite low in oil pressure. This seems very strange in a pair of engines that are old ( 2007 ) but virtually unused. High wear would be strange? What can happen to engines left sitting for years?
Technician: Cat Man, Cat Engine Expert replied 7 years ago
Hey Brian.
Yes I agree. With little usage, I would not suspect high wear.
I would lean more towards a relief valve in the oil filter assembly stuck open or a faulty oil pump. It has a relief valve inside as well. If it gets stuck open, the oil pressure will be low. Possibly sitting for a long time may have caused one of these to stick open.
Let me know if you need more help.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 7 years ago
Hi, a faulty oil pump at 50 hours seems unlikely and even sticky relief valves at only 50 hours, the replaced oil looked new even though it was years old. I remain confused. If it is a sticky relief valve what do I put in the oil to "unstick" it?
Technician: Cat Man, Cat Engine Expert replied 7 years ago
Hi Brian.
If a valve is stuck that means there is scaring on the valve. It will need to be replaced along with the housing it goes in.
What is the oil pressure reading?
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 7 years ago
Hi. Even scarring on a valve seems odd at 50 hours. Have you ever seen anything like this situation before? The oil pressure goes below the warning levels on the ( replaced ) sensor certainly below 240 kpa when running and 150 kpa at near idle.
Technician: Cat Man, Cat Engine Expert replied 7 years ago
Hi Brian.
Unfortunately I have not ever seen low oil pressure on an engine with low hours. But since it is low. There's got to be something causing low oil pressure since you have replaced the sensor.
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified
Cat Man and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
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 Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
10,344 Satisfied Customers
Experience: I am ASE Master Truck Certified.

Cat Man is online now

Related Medium and Heavy Trucks Questions
I have a C12 and at high idle it reads 120 is that to high
I have a C12 and at high idle it reads 120 is that to high and if so what would cause that … read more
TomcM28
TomcM28
Owner
Associates
14 satisfied customers
Baja presión de aceite. Cat c15 2 ws 6nz. Cambie sensor de
cambie sensor de aceite y arranca y el reloj se va cero y se apaga … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
About 6 months ago I started having problems when starting
About 6 months ago I started having problems when starting my CAT C12 engine: I turn it on, it turns on, engine protection light comes on and dies. I do this for about 5 or 6 times and it starts and o… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
My oil pressure in my cat 15 goes up and down while running,
Hi, my oil pressure in my cat 15 goes up and down while running, it went down till buzzer came for 10second then it says pressure ok, it's keep going to 55 and back to 35 or 40,it'd 30 at idle … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
80 satisfied customers
Cat man. Cat engine. 99 Cat c12. Stop engine light is on. No
99 Cat c12. Stop engine light is on. No check engine light. engine is derated. diesel laptop shows active unknown code DTC 358 FMI 4… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
O4 c12 cat in a pete ..new oil pum iol pressure switch new
O4 c12 cat in a pete ..new oil pum iol pressure switch new regulators new filter ...driving 17000 rpm 55 psi idle 18.20 psi but check engine light flashies continus ...oil pressure comfirm with muauan… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I got Kenworth 2000 cat C12 engine in I'm looking for how to
I got Kenworth 2000 cat C12 engine in I'm looking for how to test inyector volts … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2006 t800 with a cat c15 motor. I had a complete in
I have a 2006 t800 with a cat c15 motor. I had a complete in frame done at 1,225,000 miles. It now has 1,485,000 miles. It has been using 1 gallon of oil every 5000 miles right after oil change and th… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
604 satisfied customers
1999 international 9200 need wiring info to ecm truck side
1999 international 9200 need wiring info to ecm truck side … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
FOR CAT MAN ONLY PLEASE! DO NOT ANSWER IF NOT CAT MAN. I
FOR CAT MAN ONLY PLEASE! DO NOT ANSWER IF NOT CAT MAN. I have a 2000 F-650 pickup with a CAT 3126b in it. Approximately 3000 hours of idling time and drive time combined with only 51k miles on it. Got… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2006 peterbilt oil pressure goes from 42# to 80# to
Second opinion] i have a 2006 peterbilt oil pressure goes from 42# ***** 80# ***** 03 while running it is a C-13 acert cat engine do you think it is a sensor and where is it located… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2006 peterbilt oil pressure goes from 42# to 80# to
i have a 2006 peterbilt oil pressure goes from 42# ***** 80# ***** 03 while running it is a C-13 acert cat engine do you think it is a sensor and where is it located … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 2012 t660 with a paccar engine. My low oil pressure
I have a 2012 t660 with a paccar engine. My low oil pressure light comes on when a stop or slow down to get on the off ramp . My oil pressure reading is 40-45psi while I'm driving but drops to 15 when… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
C12 on the oil filter housing has oil pressure valves. 2 on
C12 on the oil filter housing has oil pressure valves. 2 on side of housing and 1 on the top. What do these do?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
YG02 PTW Foden Cat Engine No CPD 00570. C12 -400 - 3000
YG02 PTW Foden Cat Engine No CPD 00570. C12 -400 - 3000 series. Engine stopped on tick over, oil, water and diesel ok. Engine turns over and over and over but will not fire up.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Hi , i have 2136 cat 350hp marine. I want to know what oil
Hi , i have 2136 cat 350hp marine. I want to know what oil pressure psi should be on Idle and what psi on 2000 rpm? Thanks… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Komatsu diesel oil pressure warning at idle - new behavior
Hello, I've got a Komatsu D20P-5 dozer that I've had about 6-7 years. I think it's a mid-80's model but wouldn't bet my life on it... Put all new engine fluids and filters in it when I got it, and hav… read more
Expert
Expert
I have an 2000 frghtliner FL70 w/3126 CAT. runs great ,but
I have an 2000 frghtliner FL70 w/3126 CAT. runs great ,but cant shut it off ,want restart. I have done service, filters , fluids , no diag codes present. can you help?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 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.

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:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

10,344 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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