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03 mazda 6 timing tensioner malfunction
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big_block
New User
Jan 21, 2010, 10:54 PM
Post #1 of 10
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03 mazda 6 timing tensioner malfunction
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2003
Mazda
6
3.0L DOHC
78,000 miles
Yes, i have the car above, and i was driving it about 100 miles away from home and i noticed it started running oddly like it started to die. Then i started it back up on the way home and noticed it seemed to be missing, so i decide to drive it home. Between there and home, it started approx. 3 times and when i got home, it didn't start back up. I have concluded that one of the timing chain tensioners broke due to the really loose timing chain. What i need to know is if anyone else has had this common problem, and if this engine is an interference engine. Any help would be appreciated, so thanks very much. BTW i am in my last year of college for automotive tech so things don't have to be explained as if i were a beginner. Thx again.
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Sidom
Veteran
/ Moderator
Jan 21, 2010, 11:39 PM
Post #2 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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That's not a common problem on chain driven motors, not at that mileage.
Have you run a compression test or tore it down to confirm it jumped time? How did you arrive at your conclusion?
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big_block
New User
Jan 21, 2010, 11:44 PM
Post #3 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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well first of all, its tore apart so i know its a broken tensioner, i forgot to mention that, but i haven't pulled the head and was just curious if it was an interference or freewheeling engine
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Sidom
Veteran
/ Moderator
Jan 21, 2010, 11:51 PM
Post #4 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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Well that would confirm a diagnosis.....
Yes that is an interference engine.
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big_block
New User
Jan 22, 2010, 9:06 AM
Post #5 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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I was just curious where you got that information because i looked all over on the web and couldn't find where it said it was
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Sidom
Veteran
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Jan 22, 2010, 8:35 PM
Post #6 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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You're not going to find a list of interference engines for chain driven motors, a good rule of thumb is if it's chain driven or a DOHC more than likely it's interference...
If you have any doubts on yours just look at the procedure for changing the chain in your database. I guarantee there is a footnote when lining up the gears to do it a certain way or engine damage can result.....that means it's interference.....
I'm surprised yours when out so early, I'm thinking that it had to have been making noise for a while......
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 23, 2010, 2:29 AM
Post #7 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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Ditto - I've never seen or found a listing on which engines are or aren't interference but some procedures will say so,
T
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big_block
New User
Jan 24, 2010, 12:38 AM
Post #8 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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Actually no it just all of a sudden started misfiring then when i got home it didn't start so we jerked it apart and yea we checked it out...definately an interference engine all intake valves on front bank are bent
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Sidom
Veteran
/ Moderator
Jan 24, 2010, 10:37 AM
Post #9 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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Wow..... That sux. Well it happens, usually you get some kind of warning but unfortunately as you see here....... Not always.
The brightside (if there is one) you're in your last year & this will be some good experience and save you some $$$$$$
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RELAYDUDE
New User
Mar 17, 2010, 11:52 AM
Post #10 of 10
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Re: 03 mazda 6 timing tensioner malfunction
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Hey big_block, apparently this a pretty common issue. I have the exact year, engine etc. with ~ 74000 miles on it. Well cared for with regular oil change intervals. She shut down on the highway. Timing off ten degrees. Now the worst part, $2500 to replace timing components! I have replaced many timing chains on 70's & 80's vehicles in my time and these ran typically to 140000 plus before required maintainance. < $100 worth of parts and a day in the yard. I guess the Mazda is a real pain in the butt to fix? Whats makes this so complicated? I am in the process of contacting Mazda directly. I don't expect to get anywhere but it will be fun for personal release.
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