Question about Mercedes-Benz 300-Class
My scania 143 450hp 14 litre truck has lost power. We have overhauled the injector pump and injectors, which has improved it but under full load it is not holding its power. Has anyone got any suggestions??
Change turbo or get it recon might seem OK but I have had this problem before and that fixed it an power was unbelievable
Posted on Feb 06, 2015
Check and adjust the injection timing of the pump and set it to spot on as any degrees retarded will affect performance. Check that there is no boost pressure from the turbo being lost from loose hoses and cracked tubes and intercooler. If you engine has a air compressor with a coiled steel line attached to it before the line is connected to a rubber hose to the tank Then replace the coil as it blocks up with carbon and puts the air compressor under constant load. Check for worn brake pivots as dragging brakes use up HP Finally have the truck chassis dyno tested to check for full pump operation as I had experience where the pump was fully rebuilt but the cam bearings in the pump were not replace and the pump was way off setting. ON a chassis dyno tested in direct gear the reading should ne around 410 hp at the rear wheels depending on the tread of the tyres. The test will show at what rpm\'s the governor in the pump is not performing as the power curve will not follow the set line.
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
open the intake manifold by removing the air cleaner and or hose look on the back side of the plate to see if there is varnish and gum if there is you need to do a top engine clean, You must understand that running that kind of gas will cause varnish and carbon buildup on the pistons and valves. This causes the knock sensor to not to be able to adjust for compression change. It can only advance the timing 50% once the carbon build up is to much it will start knocking. If you want to receive instructions on how to fix this then rate me post a comment and I will give you the two page answer on how to do this. Unless you want to keep buying parts. your choice. I will no longer post it here as I see some think they can just take my answers and copy them.
Posted on Aug 31, 2009
the fault codes 53-54 is problem in cylender 3and4 unit injectores but that is not the main cause to make the engine is not starting check the overflow valve and the fuel pump or another fault code in the control unit
Posted on Jul 04, 2010
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P0380 Glow Plug/Heater Circuit A -Circuit Malfunction
P0381 Glow Plug/Heater Indicator/Warning Lamp Circuit
This is the code i think your seeing so you need some new heater plugs or maybe a fuse or a timer relay but as this is a direct injection scania diesel then it will start anyway unless you in ice road truckers land ,Now iam unsure about the year of this vehicle but iam assuming its a newer version than i worked on 30+ years ago so its common rail injection and all computer controlled which means its not a mechanic like old fleet fitter here but a Bosch diesel specialist to connect up to the computer and see whats what ,now if it had the old bosch injector pump and it was 40 yrs old then i soon beat it into submission for you but this electronic controlled although i know whats its doing and how it does it i cannot even think about trying to repair it without the 10,000 euros worth of fancy electronic gear and the newer ones have to be connected to the internet back to the factory owing to the encrypted software used to prevent the chinese from copying it and selling it over the internet .
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