Hello everyone, I am seeking advice on my Volvo L120C wheel loader, which is experiencing issues with power loss and excessive smoking. I purchased this machine from a quarry in poor condition, with difficulties in starting and breather blow by. After disassembling the engine, installing new liners, rings, and valves, we realized that the timing gears had been tampered with and the injection timing was off. Despite multiple attempts, we settled on 20 BTDC for injection timing, which improved the starting process. However, when we reinstalled the engine, we observed grayish smoke at idle and thick grey-black smoke under load. Subsequently, we replaced the injector nozzles and had the pump tested to address a possible overfuelling issue, but to no avail. The machine still lacks power and runs warmer than usual, despite starting easily. I am at a loss on what to try next, as I have invested a significant amount of money into this without seeing any improvements. Any suggestions or insights would be highly appreciated.
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If your engine is running at 20 degrees before top dead center (BTDC), it may be necessary to remove the cylinder heads to check the condition of the pistons. The ignition timing is set at 9 degrees, and running the engine that hot could have potentially caused immediate problems. I recommend conducting a compression test to assess the engine's health. The specifications for a "new" engine are 377. Best of luck with the inspection and repairs.
Hey buddy, I'll start by adjusting the timing to 9 degrees and let's see how it goes. Thanks!
Today, I attempted to set the timing to 9 degrees Before Top Dead Center (BTDC). However, the engine failed to start. I will double-check the timing tomorrow, although I believe I set it correctly. Can anyone suggest reasons why the engine might not start at 9 BTDC, even though it started immediately at 20 BTDC with just a turn of the key?
Are you checking the flywheel marks with the pointer properly aligned?
Answer: Answer: Power loss and excessive smoking in your Volvo L120C wheel loader could be attributed to issues such as incorrect injection timing, overfuelling, worn injector nozzles, or other engine-related problems.
Answer: Answer: The steps taken include disassembling the engine, installing new liners, rings, and valves, adjusting the injection timing, replacing injector nozzles, and testing the pump to address potential overfuelling.
Answer: Answer: The persistence of power loss and smoke issues in the Volvo L120C wheel loader could indicate that the root cause has not been fully identified or adequately resolved. Further diagnostics may be required to pinpoint the exact issue affecting the machine's performance.
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