Skip the auto shop - Our mechanics make house calls

Q: Timing chain positioning

asked by on

Heard noise coming from behind timing chain cover. Vehicle started running bad and just stopped running.Took off valve cover and chain was very slack. Replaced timing chain and tensioner. Made sure my timing marks were in place . Took pin out of tensioner and rechecked timing marks 3 or more times and all 3 were in place. Turned the engine over a few times and all timing marks were off. I don't know if the cvvt system had effected it or not. I do not know what I should do now could you be so kind to let me know what to do next thank you VERY MUCH!!!!!!

My car has 160000 miles.
My car has an automatic transmission. 2.4 DOHC cvvt

A: This system is a bit complex. I can give yo...

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Replaced a timing belt and timing belt tensioner pulley. Still wont run. Why?

If you broke the timing belt while driving then you may have bent the valves. You should have the engine compression checked to see if you are loosing compression due to bent valves. If compression is low then have cylinders...

Q: I turn my high beam headlights on and both headlights go out.

Hello, thanks for writing in about your Nissan Frontier. The only way to tell if it is the light bulbs or the switch is to check for power to the bulbs when you switch to high beam. Most of the...

Q: the alarm goes off everyday / night more than 25 times please help

I'd bet it has to do with either a door, hood, or trunk latch. Maybe even a dome light switch. Most newer cars have the dome light switch built into the door latches. Sometimes they can wear or break. Other...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...