What is a timing belt? A timing belt is a cogged rubber
belt that connects the camshaft and crankshaft of an engine. The crankshaft is
spun by the pistons via connecting rods, sort of like the crank on a bicycle is
spun by your legs. The camshaft must open valves at certain points in the
pistons’ travel, so the camshafts’ rotation must be synchronized to the
crankshaft’s rotation. This is why the timing belt has cogs. The bumps in the
timing belt fit into cogs in the cam and crank sprockets to prevent slippage.
Do all cars have timing belts? No. Some cars have a timing
chain that connects the cam and crank sprockets and others have timing gears
that connect directly.
When should I replace my timing belt?
The manufacturer usually publishes a mileage/time interval for timing belt replacement,
however, for some makes and models it’s not always clear, logical, or the best
time.
Some examples:
Not clear: When the Acura was introduced there was no mileage or time interval published. (Later Acura recommended a 90K mi. 7.5-year interval)
Not logical: Some Mazda cars have a 105K mile interval for federal cars, but a 60K interval for California cars, even though the engine design and the timing belt part number are the same.
Not the best time: Most pre-1998 Toyota cars have a 60K mi. interval, yet the timing belts will easily last until 80K.
So, when should you replace your belt? When in doubt, use
the published interval (if there is one). Give us a call with the year and
model of your Acura, Honda, Mazda, Nissan, or Toyota, Audi, Hyundai, Subaru or
Kia and we’ll be happy to let you know the manufacturer’s specifications or
give you our opinion based on our past experience with your vehicle’s model.
Should I replace the water pump with the timing belt?
Maybe. There are a lot of variables involved! The right time to replace the pump
depends on your individual vehicle – the make, model, and how many miles are on
it. It also depends on the type of water pump your car uses and whether it’s
rotated by the timing belt; if it is, then it’s definitely a good time to do it,
plus having it done now can save you money in the long-run. If the water pump
is blocked by the timing belt (in other words — you must remove the timing
belt to remove the water pump), then yes; it will save you money, time, and
hassle. If the water pump can be replaced without removing the timing belt,
then it’s not necessary to replace the water pump unless it’s worn or leaking.
If the water pump is easier to replace when the timing belt is off, then you
may want to consider replacing it since your vehicle is already in the shop.
There’s also the question of cost; can you afford to do it now, while your
vehicle is already in the shop, or would it be easier on your budget to come
back in six months or so?
Should I replace the cam seal / crank seal / oil pump seal / oil
pump O-ring? If the seals are leaking at all, then it’s a perfect time
to replace them. They’re much easier to get to while we’re working on the
timing belt, and it’s less expensive for you. Getting the leaking seals
replaced will also prevent the possibility of needing to replace the timing
belt again in the near future.
Should I replace the timing belt tensioner / idler? If
either of them is damaged or worn down, then they should be replaced to prevent
any damage to your new timing belt. Depending on the mileage of your vehicle or
the condition of the belt tensioner/idler, you may want to have them replaced
as preventive care since there’s no additional labor charge when they’re
replaced along with the timing belt. It’s a convenient time to change them,
however, it may not be necessary.
Should I replace the accessory drive belts? If the belts are worn down
or cracked, then yes. If they’re still in good shape, they can be replaced at
any time without removing the timing belt.
Does it make a difference what brand of part I use? Not
necessarily. We work closely with our customers and always give them a choice
on the parts used. We’ll explain the pros and cons of the different brands so
you can make the most informed decision possible. We use quality parts,
regardless of brand, and will always offer the best solution to fit your needs
and budget. We provide a 3 year/36,000 mile warranty on all parts and labor, so
no matter which part you choose, you can always feel confident in the quality
of our repairs and part selection. If you have any questions or would like to
schedule an appointment, give us a call at 253-854-6762. We’re always happy to
help!