05-20-2010 07:55 AM
CAT 3512 TALE WITH SI IGNITION ON IT, THERE WAS NO CONTROL OVER ELECTRONIC TIMING, ONLY WAY TO MAKE ENGINE RUN WAS TO HAVE DDT HOOKED UP AND IN MAG CAL, JUMPED WIRES IN AIB BOX UNTIL NEW AIB CAME IN, REPLACED AIB AND UNIT STARTED AND RAN GREAT FOR EXACTLY 14 DAYS. NOW I AM HAVING EXACT SAME PROBLEM AGAIN WITH NO ELECTRONIC CONTROL OVER TIMING, I WENT THROUGH ALL THE WIRES ACCORDING TO THE CAT SERVICE MANUAL AND FOUND NO PROBLEMS. COULD IT BE THE AIB BOX AGAIN?? ANY HELP APPRECIATED
05-21-2010 09:19 PM
Could be several things.
Is the magneto properly mechanically calibrated?
Are the flywheel and crank angle sensors clean and properly adjusted?
Is the magneto good? No oil leaking from the drive end? Induction coils no sign of overheat?
Do you have a shorting plug? This is a connector with internal jumpers that can be installed on the magneto to let it run to do troubleshooting.
Is the AIB box properly grounded? Are the connections clean, no damage to wiring?
What is condition of igniton primary wiring and transformers? This is an older engine, what is overall condition?
Do you have any indication of detonation?
This was not a particularly great system, and I found a lot over the years running on the shorting plug. Upgrade to EIS pricey.
08-03-2010 01:07 AM
I also have same problem with 3512 engine.when engine start and run in idle speed RPM.Engine run smoothly.But the problem is when rpm increase to 1200rpm and above,engine will huntting and turbo will surging..in a few second engine will stop emergency by it self.with over speed signal light on..please help to find the solution??
are the problem come from electronic system or from the mechanical problem like fuel injector,speed sensor or engine valve (leak)..
09-27-2010 10:46 PM
We have installed a CAT3512 LE0003 with SR4 alternator since 2005. We recently note that the surfaces of tin plated alternator busbars are tarnished slightly. As such, we wish to consult you the followings.
1. Will the busbars tarnished affect its performance, or creat the adverse effects on the genset?
2. What is the remedial methods to stop these busbar for further oxidization?
Tony Au (Singapore)
09-28-2010 12:27 PM
Depends on the amount and what is causing the tarnishing. In high humidity environments some corrosion in the generator air flow areas is unavoidable. Salt air can cause more severe corrosion and the tin plating will rapidly deteriorate. A surface that is rough to the touch increases surface resistance and allows corrosion to progress at an accelerated rate.
Investigate the source of your generator cooling air, make sure you are pulling in the cleanest driest air you can.
Have a properly working space heater, and depending on your site ambient conditions you may need to add additional heaters, possibly in the generator connection box.
You may want to coat your bus bars, either with a properly applied insulating varnish or busbar shrink sleeve. Busbar manufacturers have derate charts for bus bar that gets a coating or sleeve.
How often do you perform maintenance on your generator end? This should include visual inspection, cleaning, and basic testing such as megger testing. Also include megger testing of the busbar and cables in your regular maintenance.
Hope that helps,
01-28-2011 05:13 PM
The question posted by TCOCat generated enough interest that it has been separated into its own thread.