New Member Question about timing belt 4.7
- Thread starter r6dallas
- Start date
Then hopefully you took the cost of replacing the belt into consideration before making an offer. You can get a good price on a car from a dealer and you can get robbed blind private party.
Put me in the group of people who think it's stupid to risk damaging the engine for not wanting to do maintenance. Pretty much everyone in here is going to put the timing belt in the same category as changing oil and spark plugs - it's something you must do.
S p a r k y
New member
Why does it seem like R6dallas is catching grief or something? Everyone is going negative on him!!
He said he is going to change it, and seems like a smart guy, everyone go back and read from the beginning!
I was curious when I changed mine what would happen if not changed as well!
I didn't want to take the chance either, but since we don't know of it happening to anyone else, this could be like the end of the world crap we always hear or the Y2K crap! Glad your asking dallas
He said he is going to change it, and seems like a smart guy, everyone go back and read from the beginning!
I was curious when I changed mine what would happen if not changed as well!
I didn't want to take the chance either, but since we don't know of it happening to anyone else, this could be like the end of the world crap we always hear or the Y2K crap! Glad your asking dallas
Atlanta_man
New member
I'd expect an old well used belt to stretch some, goofing up the timing. Anyone ever see this happen ?
I have 137,000 on my timing belt, the original one, I doubt I'm gonna replace it yet, I'm looking for a kit though....
Don't change the belt. It's big auto pulling the wool over your eyes to sell you more parts. It's a Toyota!
ChaosStarter
New member
Saw one stretch on a older SC400. It set some cam and correlation codes. Luckily I changed it out for the guy in time. It was the original and over 10 years old.
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Patrick A
New member
I agree with sparky, the salt of the earth crusade in favor of scheduled maintenance is silly and irrelevant. Read the question you're answering.
I've never personally heard of this engine having a timing belt even fail. I had this same question when I first got my v8. My dad has a tundra (same engine) and didn't have the t-belt changed until 190k...only then because he had a water pump leak. No other issues, even now at ~300k. When I bought mine it had 133k, and no record of the maintenance being done. I changed it immediately because I didn't want to chance it on my "new" car, so that's as far as mine went.
I've never personally heard of this engine having a timing belt even fail. I had this same question when I first got my v8. My dad has a tundra (same engine) and didn't have the t-belt changed until 190k...only then because he had a water pump leak. No other issues, even now at ~300k. When I bought mine it had 133k, and no record of the maintenance being done. I changed it immediately because I didn't want to chance it on my "new" car, so that's as far as mine went.
JB.
New member
Recently did a bunch of recreational reading about timing belt life. Plenty of reports of belts (all makes) going 200k+ and well beyond.
My take away was that the belts themselves are extremely durable and mainly only break if something takes them out, usually the water pump.
IF (I'll probably regret this since someone will no doubt read is as advocating) someone wanted to go a longer interval on a belt, it would seem sensible to keep a very close eye on coolant levels that could indicate a water pump leak.
The issue isn't so much about the expected life of the timing belt. I wouldn't be surprised if the internal Toyota statistics suggested a median failure mileage somewhere up near 200k. The issue is about when the Toyota insurance runs out and people become self-insured. Any scolding that may be due someone at 110k miles on the original belt shouldn't be any more severe than it would be at 91k. I'd bet the actual failure rate difference between the two mileages is very small. The failure rate curve obviously starts to bend severely at some point, but we're not privy to where that is.
My take away was that the belts themselves are extremely durable and mainly only break if something takes them out, usually the water pump.
IF (I'll probably regret this since someone will no doubt read is as advocating) someone wanted to go a longer interval on a belt, it would seem sensible to keep a very close eye on coolant levels that could indicate a water pump leak.
The issue isn't so much about the expected life of the timing belt. I wouldn't be surprised if the internal Toyota statistics suggested a median failure mileage somewhere up near 200k. The issue is about when the Toyota insurance runs out and people become self-insured. Any scolding that may be due someone at 110k miles on the original belt shouldn't be any more severe than it would be at 91k. I'd bet the actual failure rate difference between the two mileages is very small. The failure rate curve obviously starts to bend severely at some point, but we're not privy to where that is.
My thought on this, which doesn't really have much behind it, is to look at the condition of your serpentine belt and use that as a guide to the condition of your timing belt. Granted, the timing belt is a heck of a lot beefier. In my case, the serpentine belt is cracked like crazy on the pulley side, so I'm going to guess that my timing belt is ready for a change.
0E
03_4x4Runner
Senior Member
This is from a 4.7 Tundra. Not Done Crying!!!!!! Broke Timing Belt Search the internet there are more stories like this especially Tundra since they are more popular.
progress4m
Member
To OP that have asked:
I have being on this forum for awhile and I have not seeing anyone ever reporting t-belt being broken.. Many have reported using belts way passing 90K and 6 years, which is recommended change interval..
I was not able to find any reports on the Web of t-belt braking on 4Runner with V8 or in LC with the same 4.7 L V8 for that matter. (We all know that 4.7 V8 in Tundra are slightly different story…)
I know what you mean about Hondas t-belt, I have heard that too… but it appears that t-belt in Toyota 4.7 L is totally different story and they have prove to be extremely reliable…
They actually appear to be more reliable vs. some of very popular V8 engines (of other brands) with timing chains. As matter of fact, I have seeing reports on this forum of timing chain being broken at least in one instance and being stretched (jump) in another instance on 4.0 Toyota V6…
I hope that was what you were looking for.
:beer:
I have being on this forum for awhile and I have not seeing anyone ever reporting t-belt being broken.. Many have reported using belts way passing 90K and 6 years, which is recommended change interval..
I was not able to find any reports on the Web of t-belt braking on 4Runner with V8 or in LC with the same 4.7 L V8 for that matter. (We all know that 4.7 V8 in Tundra are slightly different story…)
I know what you mean about Hondas t-belt, I have heard that too… but it appears that t-belt in Toyota 4.7 L is totally different story and they have prove to be extremely reliable…
They actually appear to be more reliable vs. some of very popular V8 engines (of other brands) with timing chains. As matter of fact, I have seeing reports on this forum of timing chain being broken at least in one instance and being stretched (jump) in another instance on 4.0 Toyota V6…
I hope that was what you were looking for.
:beer:
ChaosStarter
New member
We have a FJ in the shop that has a timing chain that's off the marks. Not sure yet if it stretched or something else in the chain area busted as my buddy just pulled the valve covers off for now. I will say though that it looks like the guy never did his oil changes. 93k miles and it looks like a sludge motor with 200k.
