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Old 10-07-2019, 10:23 AM   #1
lrbraner
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default Should I change the timing belt ?

Hello all, seeking input from members.*My 2003 LW300 has 77K on it.*
Although that is well below the recommended timing belt change mileage.
I am wondering if I should change it because of its age ?
Of course I would change the water pump and pulleys at the same time.
Thanks for your input.

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Old 10-07-2019, 11:11 AM   #2
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2003 L-Series 3.0L Sedan
Default Re: Should I change the timing belt ?

It will always be a personal choice against recommended timelines or mileage. Some go past 100k miles with zero issues but those may be exceptions with zero engine problems like a water pump or oil leak contributing to premature timing belt failure. Worn idler bearings don't seem to be a problem. I replaced my timing belt at 108k miles/16 yrs - water pump, belt and three idler pulleys don't seem any worse for wear but replaced as recommended for another 100k miles. I would say this is inline with (wise) preventive maintenance to ensure zero possibilities of belt/pump/bearing breakdown at the worst possible time. A timing belt letting go is almost a guarantee of immediate severe engine damage when things are in motion and cannot stop as synched camshafts/valves to pistons are suddenly no longer in synch (pistons meeting valves instead of avoiding each other). When I examined the original timing belt, pump and bearings, they appear to be able to go another 100k miles but aging does occur with the naked eyes unable to see beyond surface wear.

Your choice to replace timing belt, water pump and idler pulleys now if you intend to hold onto the car longer or anticipate selling it and passing this service to the next owner.

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Old 10-07-2019, 01:32 PM   #3
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2003 L-Series 3.0L Sedan
Default Re: Should I change the timing belt ?

This is a good question. Thankfully my Suburban has a chain.

When we bought my son's 2003 L300 5 years ago, it had 125K on the clock. I asked of the timing belt had been replaced and was told yes it had, though the seller could provide no paperwork to prove it. After purchase it went into my indi garage for the )2 sensor replacing (CEL on) and a new AC line (no AC). I asked the garage to check if the T/Belt had indeed been replaced. The answer was NO. So it was done at that point with all the other bits that you replace with the T/Belt. That meant the original belt had done 25K over the recommended 100K change time. The car hasn't missed a beat since replacement.

I just did a Google on your question and here's a link to a garage's answer on it. Their answer is both Mileage AND Time, whichever comes sooner. Time wise, they state between 7 to 10 years. That seems commonsense as the part is a rubber composite and as well know rubber perished with age.

https://www.greggsauto.net/2013/07/t...-timing-belts/

Hope this helps.

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Old 10-07-2019, 01:44 PM   #4
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Default Re: Should I change the timing belt ?

To put it simply. Better safe the sorry.

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https://www.infowars.com/

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Old 10-08-2019, 07:24 AM   #5
lrbraner
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Default Re: Should I change the timing belt ?

Follow up question.
Does the timing belt degrade sitting on the shelf ?
Would one that is new but 15 years old be OK to use ?

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Old 10-08-2019, 11:00 AM   #6
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Default Re: Should I change the timing belt ?

Would I put an unused 15 year old rubber timing belt on my car? In a word...NO!

Rock Auto show their most popular Gates Timing belt for the car at $16.72 + shipping. I think a replacement engine costs a little more!

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Old 10-30-2019, 08:34 PM   #7
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Default Re: Should I change the timing belt ?

Quote:
Originally Posted by lrbraner View Post
Follow up question.
Does the timing belt degrade sitting on the shelf ?
Would one that is new but 15 years old be OK to use ?
Get a more recent one they don't cost that much.

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