Expected lifespan of timing components?

[RS Dude]

My timing components have around 120k miles. I will be replacing the wp and serpentine belt soon, but am reluctant to replace the bearing components with relatively low miles on them. What is the average lifespan of the timing components that most people have experienced? Thanks for you replies.:heh:

 

[badattitude]

I have 207,000 on the bearings and 118,000 on the belt. The water pump has at least 128,000 miles and maybe original with 207,000 on it.

I'd recommend just the TB or TB and water pump at 128,000 total miles. If the roller bearings feel rough or show a sign of damage of course you should replace them. If they feel tight and smooth leave them. I also have 207,000 on the belt tensioner.

 

[00Spork]

This has been covered before. Some people have gone 200K+ on timing components.

 

[JayRolla]

I believe mine is all original and at 280k miles.

 

[Iluvboost]

Just did the timing belt on my 3rd gen at 163k. Looks like it was on the second belt because it had paint marks on the pulleys. The belt had deep cracks so needed to be done asap even though I don't drive it. I didn't wanna sell it like that. The rollers spinned very easily and made noise so I replaced them. Spin them by hand and you can tell if it needs them or. I didn't do the tensioner though cause I'm broke.

 

[dogtail]

202K on mine currently on my swapped out motor. Swapped motor at 112K 1 1/2 yrs ago and inspected original timing belt at time and was in good condition. I do a lot of highway miles so racks up mileage quick so I can get more out of it. I'm ready to inspect belt again soon but I figure I'll do it sometime this year regardless.

 

[amalik]

I'd like to check the condition of my belt, it was last done at 140k and I'm now at 240k, but I'm finding the timing cover can't really be pushed backwards until the upper radiator hose clamp is out of the way; is this correct?

 

[pauldub]

I'd like to check the condition of my belt, it was last done at 140k and I'm now at 240k, but I'm finding the timing cover can't really be pushed backwards until the upper radiator hose clamp is out of the way; is this correct?

Yes, just move the clamp when the engine is cold.

 

[amalik]

The problem with seeing the belt being great and not replacing is what [MENTION=10169]TheDurk[/MENTION] and many others on here have said many times; it's not the TB that generally goes bad every 100k; it's the water pump or other related timing components which can then end up shredding the belt.

And at worst case scenario, if one ignores TB change because the TB looks great (And thus, WP is not changed out either), then a failing WP could make you lose your engine with an overheat condition.

 

[96RedRunner]

A lot of good info here for making your decision easy. Pay now or pay later, for $300+- in oem parts why make it a crap shoot. :juggle:

 

[jpeaslee]

A lot of good info here for making your decision easy. Pay now or pay later, for $300+- in oem parts why make it a crap shoot. :juggle:

Yes! If you're planning on keeping your truck, this is a no brainer. I both my valve covers and cam plugs were leaking as well as I suspected a leaky crank seal. I spent about $500 did the TB, WP, crank seal, idler, tensioner, tensioner pulley, crank seal, valve cover gaskets, spark plug gaskets, cam plugs, resealed the half moons, new radiator, and new radiator hoses. Plus I got a good look under my valve cover gaskets, and confirmed my motor was as sludge free as I was hoping. A little preventative maintenance can go a long way on these trucks. I know my TB was done 4 years ago by the previous owner, but i had no record of what else was done, or if the WP was even done at the same time. It looked like he did most everything else too, but I still don't regret doing any of this. I now KNOW what's been done and how it was done.

 

[phattyduck]

A lot of good info here for making your decision easy. Pay now or pay later, for $300+- in oem parts why make it a crap shoot. :juggle:

This. My 4Runner had its timing belt done around 80-90k originally at the dealer... then around 270k by me. All OEM parts again other than the Aisin water pump (OEM mfg, just 1/2 Toyota price). Everything was still in at least ok shape, but I wouldn't want to try to put another 90k on them (official belt life).

If you are in there, why not do all the parts? If you are paying labor, it isn't much extra in parts cost. If you aren't paying labor, you saved enough money to buy the extra parts...

-Charlie

 

[RS Dude]

I forgot to mention in my OP that with 302k miles, the engine may need to be replaced soon. It runs well, but seems like these engines generally last about 300-350k miles. Didn't want to spend time and money on engine parts unnecessarily.

 

[amalik]

I forgot to mention in my OP that with 302k miles, the engine may need to be replaced soon. It runs well, but seems like these engines generally last about 300-350k miles. Didn't want to spend time and money on engine parts unnecessarily.

Plans for after 350k?


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[JayRolla]

I forgot to mention in my OP that with 302k miles, the engine may need to be replaced soon. It runs well, but seems like these engines generally last about 300-350k miles. Didn't want to spend time and money on engine parts unnecessarily.

A well maintained motor can get you over 500k. Local toyota dealer has an older 4th gen 4runner with 700k miles on original motor. They use it for snow removal and driving clients around.

 

[amalik]

A well maintained motor can get you over 500k. Local toyota dealer has an older 4th gen 4runner with 700k miles on original motor. They use it for snow removal and driving clients around.

lol. that's excessive. but, it's pretty true. i have a friend whos 3rd gen has 430k.

quite incredible an engine/tranny can go that far.

 

[96RedRunner]

I forgot to mention in my OP that with 302k miles, the engine may need to be replaced soon. It runs well, but seems like these engines generally last about 300-350k miles. Didn't want to spend time and money on engine parts unnecessarily.

That was my thinking at 340k, compression test said other wise, new TB kit installed. At 365k now, believe i'll see 400k easy. Don't believe everything you read on the net.

 

[phattyduck]

I forgot to mention in my OP that with 302k miles, the engine may need to be replaced soon. It runs well, but seems like these engines generally last about 300-350k miles. Didn't want to spend time and money on engine parts unnecessarily.

Do a compression and leakdown test if you are wondering. If the motor was cared for, everything should be great. I expect at least another 100k out of mine... (275k right now)

-Charlie

 

[JayRolla]

lol. that's excessive. but, it's pretty true. i have a friend whos 3rd gen has 430k.

quite incredible an engine/tranny can go that far.

My Eagle Talon has over 330k miles. For over 100k miles of that its been making over 400whp. Bottom end is original. Its making over double the original output and still has good compression.

Oil changes go a long way.