![]() ![]() The company changed the mapping of the OLM to a shorter sequence. General Motors installed an Oil Life Monitor (OLM) in the earlier models of the 3.6L engine and calibrated it to allow for excessive mileage between oil changes.They went further to extend the timing chain warranty to 120,000 Miles, or 10 years whichever comes first. In 2012, GM issued a memo where they offered a 'special adjustment timing chain wear' for cars running on the 3.6L engine. General Motors changed the chain's design to a 7.7mm pitch from 9.5mm. There is a design fault that can be blamed on GM.When this problem persists, the timing chain stretches in length and can even fail in some cases. This means the whole system is inadequately lubricated, which then causes more than usual wearing out of parts. Infrequent and inadequate oil in the engine means the engine runs on degraded oil. Draining such oil should be done a lot more frequently too. The GM 3.6L engine is quite thirsty, and as such, it requires more oil than most V6 engines. To understand the timing chain issue in this engine, we need to establish what causes it: However, the timing chain issue is widely known such that when you ask in the online forums what to do with your faulty engine, a good number of people will advise you to just repair the car and sell it. The GM 3.6L V6 engine is generally robust and a great performer. What causes timing chain problems in the GM 3.6L engine? This will probably be followed by the engine misfiring and, in extreme cases, stretching the chain so the engine won't start. The Engine Control Module (ECM), which closely monitors everything about the engine, will pick this anomaly in the valve opening and closing and trigger the CEL light. This causes the valves to open and close at the wrong time. If the timing chain stretches, this correction is affected. The camshaft and the crankshaft have a close correlation. One needs to check the oil level frequently and also carry at least a quart of oil in the trunk just in case. Many drivers have resulted in servicing their vehicles at 5000 miles or less. Several drivers have reported that the engine can run out of oil before the car even alerts the driver on the dashboard. There is a need to be vigilant to catch the running low oil problem in time. Repairing this anomaly requires a lot of money. If there is slack in the timing chain, then some teeth will be skipped, leading to the chain overstretching. Drivers must frequently replenish the oil to prevent the engine from depleting the oil, hence putting a strain on the timing chain tensioners. Vehicles using the GM 3.6L are known to consume more than average when it comes to oil. Cars using the GM 3.6L engine made in 2012 and onwards have fewer timing chain issues. Following numerous timing chain problems, GM upgraded the engines to address the issue. The earlier versions of the LLT engine are also prone to this problem. The engine is still in production to date. The LY7 GM 3.6L engine was introduced in 2004 and has a 10.2:1 compression ratio. While the timing chain issue is commonly associated with the GM 3.6L engine, it is more common in the LY7 version. We will explore the problems associated with the GM 3.6L timing chain, which tends to wear out way too soon than those installed in many other cars. Though the chain is made of metal, it wears out. A properly working timing chain ensures the right amount of fuel, air, and exhaust gas are mixed before the piston is pushed down. The timing chain has to run smoothly and without skipping any teeth. The chain harmonizes the crankshaft and the camshaft rotation, and then the pistons and the valves will operate at optimal capacity.īut the camshaft and the crankshaft must be synced perfectly for this to be achieved. The timing chain plays a vital role in internal combustion, ensuring the engine's proper running. The GM 3.6L engine comes with its share of issues, but in this article, we will take an in-depth look into the timing belt/chain problems that have dogged this engine for a long time. Indeed, many cars such as the Hummer 2, Chevrolet Camaro, and GMC Acadia use the GM engine. The GM 3.6L engine boasts many benefits and, in some instances, is considered a V8 comparable in terms of power and performance. If so many online car forums where car owners share ideas and ultimately get help through them, then the GM 3.6L engine timing chain problem is not something that one can wish away just yet. The timing chain problems have been persistent and have been a headache for many car owners. Like many car engines, the GM 3.6L V6 engine has been dogged by some issues.
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