3516B Unbalanced Exhaust Temperature

Starboard engine seems to be carrying more load than port, check your throttle balance...Can you hook up to ECB and check codes...? Is there any soot from port side? Pretty hard to check bearings underway, can you grease any drive bearings? Can you compare coolant flow volume?

Hauquelpa,

Ok so since these are B series and your "cat technician" ran the basic diagnostics injector cur in / out, etc. and I am assuming he found no further faults via lap top link.

30,000 hours (total accumulated hours)?

How long since top end service? If you have 30,000 hours on existing heads, then you are very, very, lucky.

Have you physically checked valve calibration? This would be a possibility.

Tim

hello,

thanks for helping.

In fact I have un balanced exhaust temps between the two V of the same engine (Stbd).

Maintenance is done as per caterpillar spec.(cylinder heads, pistons... have been done)

This problems starts to appear after a 2000 h overhaul ( check of valves and injectors clearances)

we are now checking again clearances...

do you have again any ideas???

thanks

Yes I can help you;

Run the normal valve clearance checks, be certain you are rolling the engine in direction of operation while doing this hopefully you find a problem and correct it.

Now if that shows nothing and the way I understand the difference is from one bank to another then refer to the manual on camshaft replacement, follow through till you get to cam timing, it would appear that you have lost cam timing by a few degrees. The gear and cam on the 3500 series is not locked the way I personally prefer, if not torqued properly, you can loose cam timing on a cam shaft. Remember you have one shaft per bank and the drive train is accessible from the rear.

I would suggest if you are not familiar enough or do not have the proper indicators then contact your local Cat representative. With the proper tools, its a few hour job.

Not relative to your problem, but the older EMD's were locked with dowel pins. They just don't build them the way they used to

hi,

very interesting, I did not think about a problem on camshaft.

valves/injectors clearances are ok

we are now checking, if the exhaust temps are the same on all the cylinder heads or are rising only on one or two cylinders...

afer that we check camshaft

thanks again for your help

pa

Ahhhh sorry my mistake! I thought you wrote that it was a difference from one bank to another. If it is only two or three heads, don't waste your time and effort on the cam timing. Thats what happens when ya read the posts after to many beers

RECAL of my morning post, you say there is in fact a big difference between right bank and left bank. Then yes cam timing is a real possibility.

Posters about fuel ideas, this is largely ruled out on the B series engines when performing diagnostic checks via lap top.

If its only on one side of the engine, we need to look at what is common only to that side. If injection has been ruled out and valve clearance is verified. I would certainly look at the cam on the cold bank, its a fairly quick check.

How about the fuel supply lines? Filters? and the Governors calibration?

The difference in exhaust temperature may be due to faulty injector set point as well as incorrect injection timing. Change the injector and adjust injection timing for the respective cylinder.

Hello,

Did you check and compare intake manifolds pressure.

Exactly same level of injected fuel but different volume of compressed air flow in both manifolds may cause the problem.

So don't leave us hanging.... What have you found?

hi,

thanks to every body for helping

yesterday we changed two injectors(exhaust temps of these cylinders higher than the other one)

we did not see any change in the exhaust temps. We are going today for a sea trial to monitor the engine at full load.

I will give news asap.

thanks again

pa

But you have done an injector cut out test and ran the diagnostics telling you full well they were ok right????

So why did you change the injectors?

This is just nuts, but you know that when sitting on the generator, gear box, or what ever its coupled to (like if you were on a horse with the engine in front of you) then you would vision the flywheel in front of you.....

Clockwise FLYWHEEL rotation is the more un-common R.H. direction engine

Counter-Clockwise FLYWHEEL rotation would be the standard normal L.H. direction engine correct?

Can you confirm this was timed as per the proper direction engine? If this is the case, its not the first time....

I would like to hear the outcome also please

hello,

thanks a lot to every body.

problem is not yet solved.

We checked the timing of camshafts: ok

check exhaust temperature out of each cylinder: one is very down and 2 a little down.

we wait now for injectors

I won't be able to say the final result of this story as I am changing company today...finally shoud I say...

thanks again for your help

I will be back with other problems and other engines