Method for securing the timing chain of a 5.0 Range Rover using zip ties.

[Alvinthebeast]

Hello everyone, I am planning to replace the timing chain guides using the zip tie method. I would like to know if it is possible to only change the guide rail and tensioner, or if it is also necessary to replace the plastic guide without affecting the timing. Additionally, I intend to secure the crankshaft at top dead centre (TDC) using a zip tie, as well as secure the cam and chain with zip ties. Do you think this method is sufficient to prevent the timing from going out? Please let me know. I have noticed some slack on the chain on the side of the plastic guide. Is this normal? There are no timing codes and the engine ran fine when disassembled, except for a slight knocking ticking sound. The tensioners have worn out the aluminium guides and are easy to press on. Please advise. Thank you.

[JEEPWRANGLER2020]

By according to the prescribed Jaguar Land Rover zip tie process, the likelihood of the cams shifting and becoming misaligned is almost nonexistent. The purpose of the technique is to instruct on the precise positioning of the crankshaft, ensuring that the camshafts are aligned in a manner that eliminates any strain on the lobes. If you want to secure the cams using zip ties, it is advisable to begin by securing the left hand guides and tensioners. Afterward, remove the zip ties and rotate the crankshaft following the prescribed technique before proceeding to secure the right hand side.

It is important to note that the zip tie used in the official technique is not intended to immobilise the camshafts, but rather to maintain moderate stress on the chain in order to prevent it from skipping teeth on the cam or crank sprockets. If it is necessary to replace the plastic guides, one may adjust the position of the zip tie to prevent the chain from becoming too slack during the removal of the guide.
I have performed several tasks of this kind and have never encountered the need to replace the plastic guides. What is the reason for your desire to alter them?

[Alvinthebeast]

Thank you for the information. I am interested in replacing the plastic guides due to the high mileage of 180,000. Upon visual inspection, the guides appear to be in good condition with no visible damage. I am considering whether it is necessary to replace them or if I should simply follow the recommended procedure for Land Rover. Additionally, I would like to know the reason for the slack on the side of the plastic on the chain. Thank you.

[Alvinthebeast]

Additionally, do you believe that the variable valve timing (VVT) system will continue to function well for an extended period of time, considering the mileage? It did not exhibit the typical noise associated with diesel engines during operation. Thank you.

[Alvinthebeast]

Upon inspection, it is evident that the chain on the passenger side has slackened at the lower part of the plastic guide, leaving a gap between the guide and the chain.

[JEEPWRANGLER2020]

In my own opinion, I would not choose to replace the plastic guides since I have never encountered any instances of their failure or wear. However, considering their affordability, it may still be a viable option to replace them nonetheless.

Given the distance you have travelled, it is advisable to focus specifically on the level of wear or stretching of the chain. The optimal course of action for these engines is to replace all components - including chains, tensioners, guides, and cam sprockets. However, this approach may be costly and is sometimes unnecessary if the engine has not been subjected to misuse and has had regular oil changes beyond the manufacturer's recommendations.

To assess chain wear, I first extract the pin from the new tensioners and measure its utmost elongation. Ensure that you properly secure the plunger before removing the pin to prevent it from forcefully ejecting, similar to a bullet. Subsequently, replenish the plunger and affix the pin in accordance with the handbook (this step is of utmost importance), then install the new components. After spinning the motor a few times to allow for stabilisation, measure the elongation of the plunger. This will provide an indicator of chain wear and the remaining capacity of the tensioner to compensate for future chain wear. Regrettably, I lack any specific measures, and it is important to note that this method of assessing wear is not endorsed by the manufacturer. However, relying on common sense should provide you with guidance.

The condition of the cam sprockets is contingent upon the maintenance history of the engine. Reducing the frequency of oil changes leads to increased wear and the accumulation of sludge in the sprocket system. You must determine if you are sufficiently enthusiastic to dismantle items once again inside a year or two if they begin to produce noise.

[JEEPWRANGLER2020]

You should not be very concerned about the chain slack you mentioned. Rotating the engine causes fluctuations in chain tension as a result of the cam lobes' positioning. Attempt to start the engine and see whether there is any alteration in the looseness.

[Alvinthebeast]

Thank you very much for the information. I will deal with the matter on Saturday as I will have obtained the necessary components by then. I will keep you updated on the status. Thank you.