Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

I have a 2000 c-15 6nz with 700000 on it. Last week the engine…

Customer Question
I have a 2000 c-15...
I have a 2000 c-15 6nz with 700000 on it. Last week the engine started running really rough and was blowing air back though the air cleaners on my w-900. I took it to a shop in Canada and they diagnosed the #1 hole was not firing. After removing the valve pan cover they discovered the cam shaft is worn and the first rocker arm was pitted. They of course came back with a $35k inframe. I was under a load and just kept on trucking. The next day the engine stopped missing 90% and seemed to be running fine. I realize the cam needs replacing however I am scheduled with loads for another 6000 miles. The engine developed another noise however. when building up speed between 1300 and 1500 rpm the engine is making the same noise as it does when I am jaking. It seems to get worse then gets a little better. I stopped using the jake today now when I try to use it its not nearly as strong as it was yesterday. I am on the road working and shops want to take me down for a week. Gotta keep rolling. I am now thinking its the jake causing the engine missing etc.
Submitted: 3 years ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 6 minutes by:
5/30/2015
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,458
Experience: I am ASE Master Truck Certified.
Verified
Hi. Thanks for asking your question and requesting me. I will try and help you out.
Yes I 100% agree. It sounds like a jake problem. It's most likely sticking or hanging. I have seen this before. Jakes can hang and miss and run rough then stop. If it were an injector or cylinder problem. It would not stop.
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 3 years ago
How can I fix it? Would a sticky jake be holding the valves down at tdc making the rockers excessively loose. Because they were very loose. I tightened them a halve a turn to take out the slack.
Technician: Cat Man, Cat Engine Expert replied 3 years ago
The jake would need to be rebuilt or replaced. I am sorry. I wish I had better news.
The rockers will be loose. They are not suppose to be tight. Be careful tightening them up. A feeler gauge is used to set the gap on all the rockers and Jakes.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 3 years ago
I understand how to set the gap. They were loose, I think, because of the excessive wear on the cam lobe and the deteriorating roller on #1 intake valve which is the root of my problem. While the jake is the current frustrating problem I think it to is stemming from the cam throwing everything out of adjustment. I backed the jake off the number one hole a turn and it seems to be helping. If I can get over to salt lake city I have a buddy with the tools to replace the rocker arm which will help me get my last trip in. I haul loads to Fairbanks and everything is scheduled in advance and I just need to get another week out of it engine then I can schedule it for maintenance. The truck is still working and it will run rough until it dies, but If you have been working on cats for thirty years and you think about this problem you would advise me what to do to get the truck out of the woods and buy me a little time. Thanks
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Thanks for the information.
Sounds like a plan. If it is running better that's good news. You should be able to make to salt lake. Then you can get the repairs in
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
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful. Please leave a good or higher rating so that I receive credit. Thanks.
Ask Your Own Medium and Heavy Trucks 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 Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,458
9,458 Satisfied Customers
Experience: I am ASE Master Truck Certified.

Cat Man 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:

Daniel Wilson

Daniel Wilson

2,803 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

9,458 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,892 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,243 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,351 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

991 satisfied customers

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

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
Catman 6nz rebuilt using cat parts and head on 3/2017..
catman 6nz rebuilt using cat parts and head on 3/2017.. yesterday going down the road, gave no signs, engine started making a clanking noise and smoked like a freight train light grey color... egine c… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
How many parts will have to change on a SDP engine to make a
How many parts will have to change on a SDP engine to make a MBM single turbo? … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I have a 6nz cat C-15 the engine it started blowing heavy
I have a 6nz cat C-15 the engine it started blowing heavy white smoke out of the exhaust. The problem came on without warning, there was also oil blowing out what may be #1 or # 2. I checked that the … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I am having trouble with the rack adjustment on a C12
I am having trouble with the rack adjustment on a C12 engine. Even though a new cam and lifters have been replaced the valve lash adjustment still get loose fairly frequently. Sometime it may several … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Just inframed a isx cummins esn # 79369960 run overhead by
just inframed a isx cummins esn # 79369960 run overhead by the book set jake brake by the book the problem is when jakes are applied can hear rocker noise sounds like they are too loose have readjuste… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
Hoping Cat Man can help here. I have a C-15 cat 6NZ. It had
Hi Hoping Cat Man can help here. I have a C-15 cat 6NZ. It had 800,000 KM on it and developed a miss and started pushing oil out of the breather tube. Tore the engine apart and found cyl.#3 was severe… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Have a 2000 6nz with a very distinct ticking/tapping noise.
Customer: have a 2000 6nz with a very distinct ticking/tapping noise. had overhead run and it did quite motor down, had a few exhaust that were to tight, but the distinct tick/tap is still there. Can … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
C-15 ACERT: I have a early model ACERT c-15 it is a bxs with
I have a early model ACERT c-15 it is a bxs with stand alone vva's.could not get them to set right and always had noise in air cleaners, end result carbon took out rings and head.Second inframe did a … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I have a 03 MBN that was overhauled to a 6nz earlier this spring.
I have a 03 MBN that was overhauled to a 6nz earlier this spring. It has 340D jakes that worked excellent before the overhaul. The jakes also got new kits installed at time of rebuild. All external pa… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I have a 2002 6NZ 550 CAT put new head on it 2 months ago newer oil co
I have a 2002 6NZ 550 CAT put new head on it 2 months ago newer oil cooler and air compressor. I have run it 30000 miles last week it started puffing steam out of dipstick. No antifreeze in oil. I als… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Hello again Im having another problem with a engine it is
Hello again I'm having another problem with a engine it is a 6nz it will intermittently cut out and sometimes shut off, this morning the driver said it shut off and it took a long time to start back u… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Hi Spanky, I have an 08 ISX Cummins. Had a bridge break on
Hi Spanky, I have an 08 ISX Cummins. Had a bridge break on exhaust side, pitted camshaft and roller on rocker. Can I change just camshaft, rockers and bridges or do I need to consider anything else. T… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
19 satisfied customers
Hi Cat Man I am needing some help. I bought a truck with a
Hi Cat Man I am needing some help. I bought a truck with a SDP acert with broken rockers and housing. I replaced all those parts to find low power and was unhappy with engine I never drove an acert so… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I have a cat 6nz that has started to miss like a cut out test
I have a cat 6nz that has started to miss like a cut out test at 1000 to 1600 rpms under a load. fuel pressure is 70-90psi, we changed the pressure regulator, primer, a check valve, & filters. it pass… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Hello CAT man, I recently inframed a "1LW". It only has
Hello CAT man, I recently inframed a "1LW". It only has about ten thousand miles on it and is slobbering alot of oil out the blow by tube. Its went through 6 gallon of oil already. Mostly blowing it a… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
I have a C13 SN lgk01268 with 2500 hours on it It has a flat
I have a C13 SN lgk01268 with 2500 hours on it It has a flat spot on the roller of a lifter and a groove in the cam lobe. The roller appears to turn fine. I first discovered a valve adjusting bolt tha… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Hi, Just trying to find a reason for this. I did an inframe
Hi, Just trying to find a reason for this. I did an inframe on a C-15 Cat Serial #6NZ. I did it 7 months ago, there is 110,000KM since I did it. Today there was a jake problem that showed up. Long sto… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 satisfied customers
Have a cat C16 in a Peterbilt, it was inframed 2 weeks ago,
Have a cat C16 in a Peterbilt, it was inframed 2 weeks ago, full platnuim engine kit and has had a miss like its running outta fuel on a climb. The truck did not have this issue when I took it to the … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,458 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