2004 2.3L Auto with Blown Engine - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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Old 04-21-2009, 04:04 PM   #1 (permalink)
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My father has a 2004 Mazda 6 with 2.3L and auto. The car quit yesterday with the timing chain snapping, due to extremely low oil (Don't ask). Anyway, we have found a 2003 2.3L engine with 81,000KM and 3 month warranty for $1000. I am thinking about replacing the engine myself, but he is hesitant. I sort of am too, but than I think I could handle it. I have been into cars for a long time and have fully restored a 1969 Dodge Charger R/T. However, there aren't any electronics or computers in that car. My question is how difficult is it to replace this engine? What issues would I have to worry about concerning the computers, electronics etc.?
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Old 04-21-2009, 06:59 PM   #2 (permalink)
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on the 2.3 it's not really too hard at all if you buy one that is ready to go. but keep in mind, do some reading first, as there's no way to loose the timing belt, as there isn't one, it's a chain.

$1k seems a bit high, but if it's truely bolt it in and go, it might be worth it. and i'm assuming it's the long block, no need to swap anything over from your old motor?
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Old 04-21-2009, 07:01 PM   #3 (permalink)
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Check Ebay motors, alot of junkyards sell them for less than $1k with similiar or less mileage.
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Old 04-21-2009, 07:40 PM   #4 (permalink)
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Thanks..I knew is was a chain, fingers typed belt instead, if it was a belt, might not be as bad. Do they usually take this engine out by dropping it out the bottom with the front subframe?
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Old 04-22-2009, 03:08 AM   #5 (permalink)
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Sadly even with a belt it would be bad... they are interference engines, so I suspect you have many bent valves.

I change mine through the top by removing the bonnet and then disconnecting everything. The biggest bitch is pulling the driveshafts from the tranny. It won't go back in place with the serpentine belt in place. You have to fit the alternator and exhaust manifold as you lower the motor into the car using a hoist you can move around. You will get the gist of it while taking the screwed motor out. For 2 people that can spin a spanner it's a comfortable 2 day job to re-fit into an empty bay. Just take your time and you will be fine.

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Old 04-22-2009, 12:04 PM   #6 (permalink)
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The dealer told my father that the 2004 2.3L was sligtly different than 2003 (sensors and such) and 2005 and later years. He said he would have to find a 2004 and could not use the 2003.
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