timing chain寿命

Cambelts can fail without warning, however, if you are lucky, you might hear a rattling sound coming from your engine. This rattling could mean that the Tensioner’s or Idler pulley’s that the Cambelt runs on are busy failing. But because there is no guarantee this will happen. Manufacturers have set time intervals depending on the make and model of the car where they recommend when the Cambelt needs is to be changed. Not even the manufacturers are able to predict when a Cambelt might break.

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On older cars it was rare to find a Cambelt cover to protect the belt from outside contaminants such as dust, water, and oil. Over time if dust settled on the belt or water/oil dripped onto it, it would cause the belt to age faster and evidently break sooner. For this reason, Cambelts now have a cover to protect them. However, this cover does not prevent the belt from stretching over time which could also cause the belt to break.

Autoworks strongly recommends that these intervals are followed to avoid unnecessary expenses to you. If you are unsure when your cambelt needs to be changed, send us your VIN number and we will assist you.

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If Either break while your engine is turning it will cause the Valves and Pistons to collide with each other. More than 100 times per minute. This type of damage can only be repaired with either an engine overhaul or an engine replacement. These costs can add up fairly quickly and could easily cost more than what the car is worth.

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Timing Chains are by far simpler than a Cambelt, however, they do share some similarities. They are the same in the way they operate and in the way they stretch. Because Chains are made of metal, they are not susceptible to dust, water or oil meaning they last longer. However, because they still stretch, they do have a lifespan.

Your Cambelt and Timing Chain could possibly be one of the most important items when it comes to the maintenance of your vehicle. They are designed to keep the top half of your engine which houses the Valves and Cylinder head moving with the bottom containing the Pistons and Crankcase.

Timingchain

Autoworks recommends that as soon as you hear that first rattle do not hesitate to give us a call. We will book your car in for an assessment and advise you of the outcome and the way forward.

Chains do not have a set replacement interval like the Cambelt as they can also wear down depending on how the car gets driven. The harder you drive your car, the quicker your timing chain will start to fail. However, unlike the Cambelt, Timing Chains normally warn you in advance when they are about to break. They give off a rattling sound that can be heard when you start your car in the morning. And as the chain continues to stretch it can even be heard as you drive.

Another issue we have with most unit bearings (Dodge, GM, and Jeep) is that most of them do not allow for a selectable front locking hub (late-model Ford Super Dutys do have selectable or vacuum-controlled hubs), and this means that as you drive down the street you are spinning all your internal axleshafts and front differential, which in turn saps your mileage and fuel economy. There are kits available from Dynatrac and Solid Axle that replace common unit bearings with a rebuildable hub and selectable hubs, but these require a fair bit of mileage to recoup the costs depending on the price of fuel.

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Sometimes it's just easier to simply replace worn unit bearings with replacement parts. That is our plan for this month's back-to-basics story. This repair/replacement should have been an easy job, which of course means it took us more than a week! Time was spent tracking down the parts (easy), beating the rusty old parts to oblivion in the removal stage (hard), and carefully putting it all back together again (easy).

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8. The unit bearing came apart but left its mounting side still in the steering knuckle. We removed the knuckle from the axlehousing. This is not possible when the unit bearing is in one piece, but with the splined outer section removed, we were able to remove the two ball-joint nuts and drop the knuckle off the axle. We put the knuckle in the press and applied enough pressure to finally press the rusted old unit bearing out. This can have dire consequences, as the knuckles can bend if the unit bearing doesn't come out. After we removed the unit bearing, we checked the knuckle for flatness with a straightedge on the unit-bearing mounting surface.

Last month we showed you the basic steps to repack front wheel bearings in all their greasy glory, but not every 4x4 has rebuildable front bearings. The nonserviceable front hubs are commonly referred to as unit bearings or, more technically, the axle bearing and hub assembly. These are a factory-built piece with two bearings and race assemblies already installed and packed with grease. We like unit bearings for their ease of assembly (at least in theory, as you'll see in the photos) and the fact that there is no greasy mess required. The unit bearings are machine assembled to extremely high tolerances and engineered with better seals and bearing life in mind compared to the older serviceable bearing hub design. However these same traits mean that if the unit bearings should start to, or completely, fail you must replace the entire unit, whereas a properly serviced older-style hub bearing like we showed you last month can last at least as long (if not longer) with proper maintenance. These unit bearings can cost well over $200 each, while servicing your rebuildable hubs takes only the cost of parts cleaner, grease, and a new hub seal if the bearings are still good. If the bearings are not good, you'll still spend less than $100 per wheel end.

Your vehicle is a complex machine with numerous components working in harmony to ensure smooth operation. Among these crucial elements,…