Ask Dr. LJ: automotive category

[naiad]

Somehow I made it this far in life without ever hearing of this thing called a timing belt, until now. Fortunately, I learned about it because wotw (of all people) suggested I might need one, not because mine broke. My 2000 Sienna minivan has about 93,400 miles on it. Toyota says I should have replaced the timing belt at 90K. I was planning on

Comments

[melebeth]

When you find out can you also find out what a timing belt DOES?

<- similarly car-ignorant

[mrf_arch]

My recollection is that timing belt failure leads to catastrophic engine failure, so it is perhaps not a place to skimp.

[docorion]

A timing belt controls the timing

[points]

Agreed - you -do not- want your timing belt to fail. Now, there's a number of places that always tell you to change your belt. A lot of the 'quick oil stop' places try and do it as an upsell. However, I find that Toyota (and Honda) have their lifetimes fairly well figured out in terms of average wear. If the belt goes, and the engine is running, the car is as good as junked in most cases.

[sunspiral]

What they said, plus avoid the "quick oil stop" places - they're often staffed by underqualified people who may be following incorrect information on fluid type and quantity for your vehicle. One of those places cost me a transmission years ago.

[jacflash]

What they all said. With an interference engine, a broken timing belt is a four-figure repair bill, and the first digit probably won't be a "1". Have a competent shop (most dealer service departments count, for this purpose) do the job ASAP.

[library_sexy]

While you are doing the timing belt get the water pump changed at the same time. Some cars have them attached others not, but because most of the cost is in getting to the part it is more cost effective to change them both at the same time.

If you don't change the timing belt and it dies while on your trip you can freeze your engine and then you own a nice large chunk of metal that doesn't go from point A to point B.

The last car I had to do this on I think I spent between $700 and $900 to get the timing belt, water pump and I think I had the serpentine belt done too.