Question about Caterpillar D398 marine engine - 1200 rpm

1 Answer

Causes for excessive fuel consumption in caterpillar D398 Engine

D398-66B05685

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 11 Answers

V12 twin turbo with 2x 6cylinder injector pumps.

Excessive fuel consumption can be ...
fuel leak on to the ground.. Obvious
fuel leak into sump via fuel pump body... Check sump oil
worn piston rings... Grey Smoke
glazed cylinder walls...smoke
burnt valves... Need compressin test
faulty turbo(s)... Sound, check manifold pressures
blocked exhaust line/muffler... Smoke black
faulty thermostat so motor doesn't get up to temperature, what is motor temperature ? ... Smoke black
lack of oil, wrong grade of oil for temperature
scavenge fuel line from injectors blocked or not returning to tank
faulty injector(s) causing poor fuel spray
faulty injector(s) bleeding fuel into cylinders... Smoke black
faulty injector pump balance
faulty injector pump timing
faulty coupling between injector pumps, even can be one 180deg out of timing
bad diesel fuel

Are there mechanical losses in motor load ? Alternator fault ? or gearbox fault prop fault ?

What is the exhaust colour ? Black or grey ?
What are the inlet manifold pressures ?
Using a thermometer ( IR if available ) what are the cylinder head or exhaust manifold temperatures ? This may isolate problem to one or more cylinders.

If you can supply more information I may be able to help track down the problem.

Tony

Posted on Apr 12, 2015

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Why my vito 115 using planty diesel


change fuel filter + clean egr valve

Jul 10, 2016 | Cars & Trucks

1 Answer

Civic 06 vti using excesive amount of fuel


The computer will very likely be generating engine fault codes if you have quite excessive consumption and there is no point in guessing what the problem is as there can be numerous causes. You have not mentioned if you have a check engine light showing but if you don't just yet you soon will if the problem persists.

1. Go to a reputable mechanic and have the car scanned for fault codes because it will be very likely throwing some codes if you are having a high engine fuel consumption issue (as opposed to a loss of fuel from the fuel system due to an external fuel leak).

2. On thing you can do yourself is remove the old dusty air filter element in the air intake box ( which no doubt has not been changed since ????) and put in a new OEM air filter unit. A dirty clogged unit will cause your engine to run poorly.

Apr 03, 2016 | 2003 Honda Civic

2 Answers

Causes of excessive fuel consumption


Hello, There are several causes for excessive fuel consumption . Dirty or clogged air filter, leaking gas hose or fuel lines, under inflated tires, wrong sized tires, excessive weight in the trunk, a heavy foot on the gas pedal are only a few.

Mar 17, 2015 | Cars & Trucks

1 Answer

My Hyundai 1999 model CHECK ENGINE LIGHT IS ALWAYS ON AND THE FUEL CONSUMPTION IS HIGH.


Do you have black smoke or what looks like soot coming out of the tail pipe. The check engine light monitors fuel pressure through the computer and pressure regulator. It will come on if the pump pressure is too high or too low. If the pressure regulator is faulty it could cause excessive fuel consumption,

Jan 19, 2015 | 1999 Hyundai Sonata

1 Answer

WHILE RUNNING SUDDENLY ENGINE STOP .THEN WE TRY TO START BUT NOT WORKING .WE CHECK INJECTOR IT IS WORKING .


There are more than one injector, did you check them all for fuel point of delivery? make sure cyl 1 is at point of delivery when flywheel is at delivery mark. Did it make a noise when it stopped? You may have lost a timing drive train? Has the fuel rack been shutdown due to a control signal? Please check these things, along with obvious sensor inputs

Aug 15, 2013 | Caterpillar D398 marine engine - 1200 rpm

1 Answer

Dears:Sirs We have caterpillar Gen Set 3516B to reduce the consumption of diesel we added boi fuel to the system (using gas mixed with inlet air) this reduced it by 30-40% ,but it lead to lube oil...


I am not sure what Bio fuel conversion system you ahve added, I assume it is to the air intake system. Before you did that, check the compression on each cylinder as incorrect set up bio fuel after market gas kits can cause overheating of the fuel rail system. Also the system maybe running too rich now with the injection of gas.

Aug 15, 2011 | Caterpillar Electrical Supplies

2 Answers

What does error code p0172 and p0174?


P0172 - Fuel Injection System Too Rich Bank 1 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connec
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.



P0174 - Fuel Injection System Too Lean Bank 2 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.

Feb 21, 2011 | 1998 Ford Expedition

1 Answer

1997 Hyundai Elantra has excessive consumption of gasoline, every time the tank is almost full the check engine light turn on. Also the air bag lights is on.


HAVE VECHICLE SCANNED FOR FAULTY EVAP CANISTER PURGE VALVE IT NOT CONTROLLING EXCESS FUEL VAPORS..THAT WILL CAUSE LOT OF FUEL CONSUMPTION.

Feb 06, 2011 | 1997 Hyundai Elantra

1 Answer

Uses excessive fuel


Brakes could be binding or hand bake cable holding on but you think youd smell burning brakes if that was the case!What condition is the oxy sensor in ,maybe carboned up and contaminated which can tell the engine management to supply more fuel than required.is the air filter air box in good condition and air box lid securely fastened.Should be sealed from air box to throttle body If the air filter is clogged and dirty that can lead to excess fuel consumption.Have you installed any injector cleaner in the fuel tank.cleans up dirty injectors thst can cause excess fuel consumption.

Oct 20, 2008 | 1995 Nissan Pathfinder

Not finding what you are looking for?
Caterpillar D398 marine engine - 1200 rpm Logo

283 people viewed this question

Ask a Question

Usually answered in minutes!

Top Caterpillar Electrical Supplies Experts

Lawrence Oravetz

Level 3 Expert

9587 Answers

Todd Arndt
Todd Arndt

Level 3 Expert

2044 Answers

Ted Maxwell

Level 3 Expert

3519 Answers

Are you a Caterpillar Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...