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Theres a noise coming from the top side of my motor were the timing chain is located on my 1996 infiniti i30 3. 0 what could it be?

Please somebody help me this car is all i have

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Since it is a double overhead cam engine, it uses one large and two small chains with gears.
You'll probably have to take the timing cover off to find out what is causing the noise.
One of the tensioner components may have failed and the chain may be loose.

Posted on Dec 11, 2012

  • 1 more comment 
  • christopher Dec 16, 2012

    so if its 1 of the tensioners in the timing chain that went bad do i have 2 take the timing chain of or can i just replace the tensioner without interrupting the timing?

  •  Stephen
    Stephen Dec 16, 2012

    You might be able to replace a tensioner without moving the chain. It all depends on what you find when you take the cover off. Its also possible one of the chains has worn out.

  • christopher Dec 18, 2012

    so if 1 of the chainds per say went out then the hole timing has 2 b redone? i mean car was still running fine when i decited 2 take apart just a grinding noise cuming from the timing chain im asuming its a tensioner or arm



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SOURCE: top end cam and crank chains are off!

I can help you with this.You have to start all over again.There should be three chains all together. Two short ones and one long one.The two short ones are for the cams. We are going to start with those two first.The 90 degrees they are talking about the timing mark on the gears on the cams should be 90 degrees from the flat surface of the cylinder head.The easiest way to do is find the marks on the gears and then find the links on the chains that are different color line those up with the timing marks on the gears. There should be 12 links one color link to the other. Set those and put the tensioners on little tricky on those. When you are going to set the big chain the cams are going to move some don't worry about as long as those color links stay on the timing marks. They will move a little and it looks like they are off but they are not. Once you do that the long chain also has different color links also align those with the timing marks on the cam sprokets and crank gear.Install your tensioner for the long chain. You have to collapse the tensioner all the way in and install collapse. Once in with a screw driver pry in against the tensioner to realease it. If you fail to do this you will hear chain hitting the metal cover when you start it. Once you have this together you can turn the engine in the direction that it normally runs manually and it shouldbe free. Keep in mind that once you turn the engine you will never get those timing marks to align the way they were it still ok. Hopefully this will help. I have built a lot of these engines for my customers.

Posted on Nov 12, 2009

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  • 149 Answers


Usually when rattling only occurs at 0 mph, that rattle comes from a metal component (often in the engine bay) leaning against a part of the vehicle frame. The air filter housing or retaing screw/nut/bolt/clip(s) could be to blame, so make sure that it has been properly secured so that it does not vibrate against the hood, an engine mount or the frame of the vehicle. However, it could be caused by the transmission or an engine component, such as a thrown piston rod. You did not mention any work that was done recently, so I'll just have to exclude relevant possibilities (such as a tool left under the hood). Timing components can definitely cause erratic & severely affected engine performance. Try not to drive this vehicle any more than absolutely necessary. Until you know what the issue is, prepare for the worst-case scenario.

Touchy throttle response could be from pressing on the accelerator when the transmission is out of gear (sometimes transmission anomalies such as low fluid level can result in slower transmission response—possibly allowing the engine to rev without affecting vehicle speed). Then again it could be a faulty throttle position sensor.

Square away the basics: Take the vehicle to a full-service shop for inspection. AAA members have affiliated places that would inspect a vehicle for travel-worthiness. They would check the belts & various other areas & conditions such as coolant, oil, & transmission fluid levels. You need a professional, qualified mechanic to pinpoint this with a physical inspection. If you're not a member of AAA, you can still go to many of the same places. (General rule of thumb: A $25 inspection that leads to a $250 repair still beats a $2,500 engine or transmission replacement from neglecting what could have been fixed.) Note if there are any warning lights showing on the dashboard when driving this vehicle. Tell the mechanic ALL about it! Unexpressed issues are usually the cause of unsatisfactory results. When you need guidance on the inspection's findings, we'll be here. A professional inspection is the best way to handle this scenario.

Posted on Jun 09, 2010

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