2003 Nissan Altima Logo
Posted on May 31, 2011
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I need to know how to replace the timing chain on a 2003 nissan altima 2.5 engine.

  • Marvin
    Marvin May 31, 2011

    That is a little much for the free forum, suggest you use the Premium question option.

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1 Answer

Clifford Beard

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  • Nissan Master 1,975 Answers
  • Posted on Jun 01, 2011
Clifford Beard
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I really hope you know what you're getting into.....Big & detailed job. I went on and posted the instructions as far as removal and installation of the timing chain. There is a whole other section that you need as far as removing the oil pan and strainer but way to much to post on here at this point. Anyhow, it's a 2 piece oil pan and just to let you know alot of the parts like the timing chain cover, oil pan, the cover on the timing chain cover does not have gaskets and Nissan doesn't either. You have to use some RTV and don't go cheap, get the good stuff because all the work that is involved in this you don't want to have to repeat because of a leak. Also the oil pump is in the timing chain cover and Nissan has had some problems in the past with them. I would suggest going online and finding a new oil pump that comes pre-installed in a new timing chain cover. You can pick the whole assembly including the cover for about $150.00 and worth it. Wish you were here I have one ready to go. Anyhow, email me at [email protected] and what I can do is send you the engine management section of my service manual in a PDF so you have the info on the oil pan removal.....You need it. It will also have all the stuff I am posting below so you can make it big enough to see or even print out if need be and no there isn't a cost for it. I'm in a good mood....lol. I hope this helps. Here is the timing chain instructions for you.


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  • Jose Nunez Sep 22, 2011

    This is the solution no questions asked. Great job on answering. Jose

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1 Related Answer

Navmesha

Navin Sharma

  • 315 Answers
  • Posted on Sep 08, 2011

SOURCE: my timing chain sounds loose. can it be adjusted

If it is running loose for a long time and is worn then should be replaced as soon as
But if the tensioner has come loose which it shouldn't have then an inspection of the links will further tell you if it should be replaced.There are ways to inspect the timing chain.This is a rough guide.

Timing Chain and Sprockets Cleaning and Inspection

  1. Clean the components with cleaning solvent.
    Caution Wear safety glasses in order to avoid eye damage.

  2. Dry the components with compressed air.
    tiftogif.gif

  3. Inspect the timing chain for binding or wear.
    tiftogif(1).gif

  4. Inspect the camshaft and crankshaft sprockets for:
    • Worn teeth (1)
    • Damaged teeth (2)
    • Chipped teeth (3)
    • Worn valleys between the sprocket teeth

    tiftogif(2).gif

  5. Inspect the crankshaft sprocket keyway for wear.
  6. Inspect the crankshaft sprocket oil pump drive splines for wear.
    tiftogif(3).gif

  7. Inspect the chain guide (232) for the following conditions:
    • Loose metal inserts (1)
    • Cracking (2) in the chain contact area
    • Excessive grooves (3) in the chain contact area Grooves 1 mm (0.040 in) or less in depth are to be considered normal wear.

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If it is running loose for a long time and is worn then should be replaced as soon as
But if the tensioner has come loose which it shouldn't have then an inspection of the links will further tell you if it should be replaced.There are ways to inspect the timing chain.This is a rough guide.

Timing Chain and Sprockets Cleaning and Inspection
  1. Clean the components with cleaning solvent.
    Caution Wear safety glasses in order to avoid eye damage.

  2. Dry the components with compressed air.
    tiftogif.gif

  3. Inspect the timing chain for binding or wear.
    tiftogif(1).gif

  4. Inspect the camshaft and crankshaft sprockets for:
    • Worn teeth (1)
    • Damaged teeth (2)
    • Chipped teeth (3)
    • Worn valleys between the sprocket teeth

    tiftogif(2).gif

  5. Inspect the crankshaft sprocket keyway for wear.
  6. Inspect the crankshaft sprocket oil pump drive splines for wear.
    tiftogif(3).gif

  7. Inspect the chain guide (232) for the following conditions:
    • Loose metal inserts (1)
    • Cracking (2) in the chain contact area
    • Excessive grooves (3) in the chain contact area Grooves 1 mm (0.040 in) or less in depth are to be considered normal wear.
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Nissan Altima 2003 and up have timing chains and if you have looked for them you're not going to find it unless you take the valve cover off and you will see it on the left side but be thankful for one thing that Nissan guarantees that the timing chain will last the life of the engine which is about 250,000 miles. but as anything mech. it can go out anytime new or old have this checked out soon along with the oil pressure let me know what engine you have and the millage email me and ill do some research for you Lee
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What will my car sound like, if the timing chain needs to be replaced? I have a 1997 Nissan Altima.

there will be a rattle the front of the engine. the end with all your pulleys and belts on. And it will be hard to work out if it's in the engine or the pulleys.

It is a common that a TICKING coming from the front of the engine is the timing chain guide.

This -->LINK<-- will help you alot.

Regards

Philip
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