The VM engine, a 3.0L diesel powerhouse, is known for its performance in the Jeep Grand Cherokee. However, a recent teardown has unearthed alarming issues that many owners might face. In this blog, we will explore the specifics of the engine failure, the common problems, and the potential solutions for affected vehicles.
What Happened During the Teardown?
Recently, we completed a detailed teardown of a Jeep Grand Cherokee equipped with the VM engine. This specific vehicle belonged to a customer named Peter, who requested the inspection after noticing troubling sounds during operation. Upon disassembly, we discovered significant issues, particularly with the big end bearing.
Typically, failures in these engines are most commonly associated with cylinder number five, but in this case, it was cylinder number three that showed catastrophic damage. The bearing had spun, causing extensive scoring on the crankshaft and significant wear on the con rod.
The Mechanics Behind the Failure
In a properly functioning engine, the bearing sits snugly within the con rod, allowing a thin film of oil to create a barrier between the two surfaces. This prevents direct metal-to-metal contact. However, when the bearings become too hot, as seen in this case, they can spin and fuse to the con rod, leading to severe damage.
The end cap of the number three cylinder exhibited heavy scoring and discoloration, indicating it had been subjected to excessive heat. This is a serious issue, as it renders the component beyond repair.
Why Do These Failures Occur?
There are several factors that contribute to these failures. One of the primary reasons is the combination of the 8-speed transmission and the VM engine. In vehicles often used for towing, drivers may inadvertently labour the engine by using higher gears, which can cause the bearings to overheat.
Additionally, the heat generated from excessive loads can exacerbate the wear on the bearings, leading to a premature failure. In this instance, the bearing’s integrity was compromised, resulting in the catastrophic failure we observed.
Identifying the Symptoms
Before the teardown, the owner reported unusual sounds when driving. These sounds can often be indicative of bearing failures or other significant engine issues. If you experience similar symptoms, it’s crucial to have your vehicle inspected immediately to prevent further damage.
During our teardown, we also noted that the oil filter was full of metal shavings, a clear sign that there was significant internal wear occurring within the engine.
Replacement Options for the VM Engine
Once the damage is assessed, owners are often left wondering about their options. In the case of this specific engine, the best course of action would be to consider a replacement rather than attempting a repair.
Fortunately, new engines are now available from VM, with prices in Australia ranging from AUD 14,000 to AUD 16,000. 22-23k Installed. These long motors come complete with cylinder heads and timing chains, making them a viable option for those looking to restore their vehicle’s performance.
Challenges in Finding Parts
One of the significant challenges faced by owners of the VM engine is sourcing replacement parts. Due to a patent still being in place for this engine’s internal components, finding the necessary parts can be difficult. This often leads to owners relying on second-hand engines or parts, which come with their own risks.
While rebuilding the engine is an option, it can be challenging to find the right components, and the reliability of second-hand parts can be questionable. Therefore, investing in a new engine may be the most reliable solution.
