'98 Camry V6 Timing belt surprise!

Reply
 
LinkBack Thread Tools Display Modes
Old 17 Sep 2004, 03:05 am   #1 (permalink)
Jay
Guest
  • Posts: n/a
  • User Status:


Default '98 Camry V6 Timing belt surprise!

Hi all.

I had a really bizarre problem and thought I would share.

For a little while now I had been hearing a "bearing grinding noise"
coming from my V6 1MZ-FE. I had the idlers bearings replaced at 93k
because they were bad, and I thought that the upper bearing failed
again. The timing belt was replaced at 60k and then later at 78k when I
had to get the water pump replaced.

I took the car to my excellent Toyota mechanic and he pulled the timing
belt cover and we had a listen. Much to our surprise, the noise wasn't
coming from the idler but from the cam sprocket area (the cam closest to
the front bumper).

After listening to the noise for a little while, we killed the engine
and he thought for a little while...he checked the tensioner and it
seemed OK and the idler bearings were OK too.

He then used a wrench to manually move the cam sprocket and we found the
belt had stretched tremendously, almost by a tooth! The slack in the
belt was beating against the upper cam and vibrating it which was
actually causing the awful noise!

To make a long story short, he replaced the timing belt and tensioner,
and the horrible noise went away and the engine is running very
smoothly! I can tell a tremendous difference in performance and fuel
economy has increased -- I suspect the noise was causing the knock
sensors to falsely retard ignition.

My only residual concern is when we pulled the valve cover, I noticed
some varnishing near the spark plug area closest to the cam sprocket,
though I've been doing 6k oil changes with Mobil-1 5W-30. It's possible
that the stretched timing belt somehow relates to the build up as I
distinctly recall seeing the valve cover off at 90k mi w/o any
varnishing...

Anyway, the bottom line is that if you happen to be in the timing belt
area, replace the damn thing. A stretched belt can cause weird and hard
to diagnose problems.

Jay.

  Reply With Quote
Old 17 Sep 2004, 08:31 am   #2 (permalink)
ROBMURR
Guest
  • Posts: n/a
  • User Status:


Default Re: '98 Camry V6 Timing belt surprise!

My 97 camry 4 cyl had a loose belt
from the factory. Make sure you use
a genuine toyota belt.
  Reply With Quote
Old 17 Sep 2004, 01:28 pm   #3 (permalink)
Jay
Guest
  • Posts: n/a
  • User Status:


Default Re: '98 Camry V6 Timing belt surprise!

Robmurr,

> My 97 camry 4 cyl had a loose belt
> from the factory. Make sure you use
> a genuine toyota belt.


The belt that was put on at 78k mi was factory as is the new one, but
thanks a lot for the suggestion.

Frankly, if you're going to go through the trouble of putting a new belt
on, why not spend the extra few $$ to get a Toyota part??

Thanks!
Jay.

  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:28 am.

Attribution:
Autoblog
Powered by Yahoo Answers



ToyotaLexusForum.com is an unofficial community for car enthusiasts. ToyotaLexusForum.com is not affiliated with Toyota Motor Corporation in any way.
Toyota Motor Corporation does not sponsor, support, or endorse ToyotaLexusForum.com in any way.
Copyright/trademark/sales mark infringements are not intended or implied.