new timing chain

new timing chain with both gears is just as lose as the old one. bought them on ebay. .???? lose side has at list 3/8+ in. play.

My car has 205000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello, and thank you for writing in. GM states that 3/8 in of play is normal. This does not mean that you should not double check that the bolts are tightened to specification, and that the installation was done perfectly. Since you purchased the new components from Ebay, you should make sure that replacement is an OEM approved replacement. Make sure the brand is of decent quality, and double check that the part was new. If there are issues with the vehicle’s timing during your testing, then you may want to turn your attention to other components in the system. For more diagnostic help, contact our service department to schedule an appointment.

How to Identify and Fix Common car Problems ?

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About Timing Belt Replacement

Older cars may have a timing chain, similar to a chain on a motorcycle, with a life cycle of around 60,000 miles.

How Much Does It Cost To Replace A Timing Chain? Replacing a timing chain will typically cost anywhere between $1,000 to $2,500 (parts and labor included.)
Unless there is a specific fault, the timing chain should be replaced between 80,000 and 120,000 miles.
The average cost for a Chevrolet Silverado 1500 Timing Chain and Gear Set Replacement is between $1,002 and $1,113. Labor costs are estimated between $422 and $533 while parts are priced between $580 and $580.
Timing chain equipped engines are ALWAYS interference engines. And again, timing belt engines may or may not be, depending on the manufacturer. So, a jumped chain or belt can call for belt replacement, a valve job, or a replacement engine, depending on engine design.
While there`s no set amount of miles your timing chain should be replaced, a general rule of thumb should be anywhere from around 50,000 to 100,000 miles.
If the engine has been well-maintained then there really is no reason to install a new engine. This engine can last 100,000 more miles if it was well-maintained. If it hasn`t been well-maintained, then I would replace the engine instead of wasting time on the chains.
The timing chain of a vehicles` engine is designed to last the life time of the engine, if that engine is maintained properly. Timing chains are not typically a maintenance service that needs to be replaced after so many miles or years like a timing belt.
It is safer to replace the timing belt even earlier than the manufacturer recommends. In general, however, timing belts needs to be replaced from 60,000 miles up to 150,000 miles.
Replacing the timing belt is an expensive service. It is an intricate, labor-intensive process that can take 4–8 hours, depending on the vehicle. But replacing the timing belt before it breaks will prevent engine damage and save you money in the long run.
As mentioned before, replacing the timing chain kit is one of the most important maintenance steps your car will need. Normally it needs to be replaced between 80,000 and 120,000 miles.
A timing chain can last for more than 200,000 miles with proper care. You may never even need a timing chain replacement, but you should book a check when your car reaches 125,000 miles.
Newer models use timing belts made of polyurethane and Kevlar for long life and durability. They can go as long as 100,000 miles although it`s always a good idea to change it before then. Belt failure can cause extensive damage to the valves, pistons and other internal parts of the engine.
A timing chain can last for more than 200,000 miles with proper care. You may never even need a timing chain replacement, but you should book a check when your car reaches 125,000 miles.
Replacing a timing chain will typically cost anywhere between $1,000 to $2,500 (parts and labor included.)

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Change my timing chain. Got it on time from upper to lower chain tensioners and now I have no spark.
ANSWER : Hey there. I would recommend checking the camshaft position sensor as this sensor is located near the timing components, to be sure that it is plugged in correctly and working properly. I would also suggest checking the crankshaft position sensor just to be sure it is also plugged in correctly.

As you know, both of these sensors will impact whether or not the motor will produce spark. If either of these are not the problem, you may want to then begin testing the ignition coils for power to be sure they are providing current to the spark plug wires. If you would like to have a professional scope this out for you, a certified technician from YourMechanic can come to your car’s location to inspect the issue getting spark.

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need a way to retain the timing chain
ANSWER : The best way to approach this unfortunately is by using a timing chain tool retainer/holder tool. You may consider having an expert from YourMechanic come to your home replace the timing chain.

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Timing chain positioning
ANSWER : This system is a bit complex. I can give you some instructions, but I highly recommend getting a hold of a repair manual or purchasing a yearly subscription for just your vehicle from AllData. It is only $25 for a years subscription from AllData.

There are two separate sets of marks on this system. One set is for aligning the timing chain to the camshaft gears and the intermediate shaft gear. There will be marks on the chain that raps around the crankshaft gear as well. These marks will not line up after you turn the motor over.The other marks are on the inside of the camshaft gears and align with the cylinder head parting line. If you were to draw a ling through the center of both camshaft gears, they should line up with that imaginary line.

The crankshaft key way should be aligned with the mating face of the main bearing cap. You can confirm it is in the correct position by verifying the number one piston is at top dead center. If you have removed the balance shaft timing chain, these marks really need a visual diagram to understand where they should be aligned. Without a diagram I am not very confident it can be explained very clearly.

This may be difficult to to follow, so again I highly recommend purchasing a repair manual in digital form or a book. If you feel this is over your head, I recommend the following inspection to help you out. Timing chain replacement

Good luck! I hope I was able to help you.

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Replacing timing chain 2004 Mazda 6
ANSWER : Hello – if the mechanic waited until the car was re-assembled after the water pump job to suggest timing chain repair, then "yes", s/he was not doing you any favor. Doing the timing chain repair separately is essentially repeating the labor. There are a number of related parts involved in a timing chain service: the timing chain itself, one or more timing chain guides, a tensioner, an idler puller(sometimes), and various o-rings and seals. Many parts manufacturers package these as a "kit", and the technician simply orders the correct kit for your engine in order to be sure they get all the right bits. I recommend a timing chain service performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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My mechanic is saying the timing chain is bad (causing oil leaks). Does a timing chain cause oil leaks? What are your thoughts?
ANSWER : Hi, thanks for writing in. Timing change themselves cannot cause an oil leak but the timing chain cover can cause an oil leak. In order to replace the timing cover gasket, you will have to remove the serpentine belt and anything that has belt driven. This includes the alternator power steering pump air conditioning compressor and crankshaft pulley as well as the water pump. Once all of this is remove the timing cover can be removed and the gasket can be replaced. I would strongly recommend having this job performed by a professional as many parts are required to be removed in order to even access the timing cover. Here at YourMechanic, we can have a technician come to your home or office to perform this replacement for you.

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It cranks doesn’t start new batteries, oil pressure switch new pmd, new injection pump. new alternator, new glow plugs.
ANSWER : Hello.

A crank but no start condition can be caused by many things. A few common causes are a faulty crank position sensor, or issues with the fuel system. The crank position sensor is used in the engine’s fuel calculations, and in some cases it’s failure will disable the engine.

It may also be possible that there is issues with the fuel system that are preventing the engine from running. If the fuel pump or injectors have an issue the engine may not run correctly, or at all. It may also be possible, for either case, that the issue may be wiring related.

I would start by trying to determine if the engine is getting fuel and then going from there. If you need assistance with these checks, consider YourMechanic, as one of our mobile technicians can come to you in order to diagnose your starting issue firsthand for an accurate repair.

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cold rough idle and P0303 code , run great after clearing code and warming up,
ANSWER : Code P0303 suggests a misfire in cylinder #3. This can happen for many reasons such as a vacuum leak, weak fuel pump (pressure), bad ignition coil, low voltage to the fuel injectors (causing pulse problems) or a faulty mass air flow sensor, all of which can cause an imbalance in the air/fuel charge in that cylinder. Try checking to see if you are able to replicate the misfire and see if it happens more under load or at idle or if it is completely just intermittent. This may help to narrow down what types of components to check.

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We have a new battery, new alternator, new coil pk, new master fuse and the car still won’t hold power.
ANSWER : Hi there. The only thing that I could think possible is causing your problem is that something may not have been correctly installed while your son was completing this maintenance. However, if your engine was difficult to start before this service, it’s possible there are different components that are damaged that simply didn’t resolve the issue. The only way of knowing what is going on with your Trailblazer would be to have one of our mobile mechanics in your area come to your location and complete a car is hard to start inspection.

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