reman engines

Discussion in 'The Garage' started by 1greenmachine, Dec 9, 2012.

  1. 1greenmachine

    1greenmachine Been here awhile

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    Well did my girlfriend a favor and did tires, brakes and a oil change on her mazda 6, the oil change was last and found some shiny metal in the oil so i did some research and found that these 2.3 engines are good for low oil pressure and then spinning rod bearings.

    The problem is the car has 118k miles on it, worth maybe 6 grand so looking for opinons on what others have done, if anyones had issues with this engine.
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  2. Gimpinator

    Gimpinator This is my Mom's cat

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    It seems silly to me to replace a perfectly good running engine. Check the oil pressure with a mechanical gauge, and go from there. If I'm reading your post correctly, there are no symptoms except metal flakes in the oil. Are they copper flakes? Have you held them up to a magnet? Could be any number of things.

    "Don't fix it if it ain't broke!"
    #2
  3. 1greenmachine

    1greenmachine Been here awhile

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    The engine i'm sure has decent pressure, mainly what i've read is that the engine will leak/use oil suddenly and the lack of oil takes out a bearing usually and when you rev it theres a very slight knock. It looks copperish, im draining the new oil out and doing a oil sample before i dig to deep.

    I pulled the valve cover and the cams look okay from what i can see, i rebuild cummins engines but this variable timing cams and other stuff is nuts, main thing is either be able to fixthe car reasonable or just trade it ogg, she lives a hour away and i'm not having her drive a time bomb in winter.
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  4. usgser

    usgser Long timer

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    The metal in the oil. You find chunks/pieces or just silvery stuff suspended in the oil? If just some suspended shiney bits I wouldn't rebuild it. Pull some main and rod bearing caps and look for wear, scratches, discoloration. Same thing you'd look for while rebuilding the dsls that you rebuild. If bronze/copper is showing through the shell the bearing is toast as is the journal and will need to be ground. Use plastigauge, reassemble bearing caps. Torque to spec, dissassemble cap and measure the plastigauge. Then you'll know if the bearing is in spec. If a long block is 4 grand find out how much for short block(no head).
    You might also see if there are any used Jap engine sellers in your area. Seems in Japan at 50,000 miles their licensing tax sky rockets and folks buy new motors. The take outs are bought by the container full and brought to the US and sold. There's a couple resellers in Seattle so I'd bet a big city in your area probably also has a reseller.
    If you regularly rebuild Cummins dsl motors buy the factory Mazda shop manual and rebuild it yourself.
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  5. Motomantra

    Motomantra Registered Lurker

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    I've put several in Honda's that turned out good. We would strip it down to the long block, then add the original stuff. If you go this route, I strongly recommend you take the oil pan off & clean the sump.
    #5
  6. 1greenmachine

    1greenmachine Been here awhile

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    Well i ran the oil sample with the new oil granted only haveing about 20 some miles but didn't show any abnormal metal. I went to the mazda place talked with a service guy and they've never seen any issues with the engine or anything i was reading on the message boards.

    I saw a couple small pieces of metal but that could just be normal because at this mileage i'm sure there will be some pieces. What worried me is what i think is tiny copper specs or im just flat out seeing stuff, honestly had i done like normal probaly would drive this for years and never notice.
    The plan is im driving the car for the week around a 100 miles or so, then i'm doing another oil sample friday, and doing the oil and filter again. Just right now i don't want to tear into the engine if i don't have to,.
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  7. buickid

    buickid Lets ride!

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    Do a UOA at the next oil change, 100 miles doesn't seem like enough to get a clear picture of whats going on.
    If its not making any strange noises now, I don't think its gonna blow up immediately. Just watch for the oil light.
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  8. 1greenmachine

    1greenmachine Been here awhile

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    It costs me ten bucks for the oil sample so im gonna do one friday and i'll do another in a couple thousand just to be safe, its not makeing any weird noises. i just wanna play it safe and if theres issues go from there. My biggest mistake was reading the mazda forums and the horror stories which were a result of letting the oil get to low, just didn't want to see her spend all this money and me having to pull it out in my unheated garage.
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  9. Pike Bishop

    Pike Bishop Pull Down the Ponzi.

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    Better buy a new engine.

    Right away. :nod

    That one surely won't last three miles.

    [​IMG]

    The tire pressure was low, so you'd better get new tires and wheels, too.
    #9
  10. H96669

    H96669 A proud pragmatist.

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    Check the specs at which the oil pressure switch would turn the idiot light on and then......add a proper oil pressure gauge.:wink: Teach the GF on how to interpret the readings.:1drink
    #10
  11. chollo9

    chollo9 Screwed the Pooch

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    Unless it's being driven where she's going to be stranded, or something similar, I'd wait for loud noises or worse. I'm on my third MPV with a V6 and the first two let go around 250K, so I expected this one to blow around the same time. It just rolled past 375, so ya never know . . ..
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  12. MacNoob

    MacNoob piney fresh

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    It wouldn't show anything abnormal - it's still brand new oil. Get your sample done once you've put 5k on that oil and some residue has time to accumulate.

    Of course not, I have yet to find ANY service business that even looks at internet fora to see what might be happening out in the real world, or who would admit to any faults in their flawless product.
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  13. 1greenmachine

    1greenmachine Been here awhile

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    Thats the prblem, shes 45 minutes away from me, she goes to her moms which is all country back roads and its winter, if it was my car i wouldn't sweat this, so i gonna run it for the week and see. I honestly like i told her probaly overreacted just moneys tight and reading online stuff made me paraniod when most issues were people running way low on oil, had i just been rushing like normal i would have never noticed and it would be fine.
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  14. 1greenmachine

    1greenmachine Been here awhile

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    Yeah i wish i had saved the old oil but i won't name the oil brand but the new oil sample i ran did show high amount of potasium which i have see in others running the same oil brand, and for that to happen in 20 miles of driving the coolant would have to be way low and other issues would be noticed.

    I agree, also they are a smaller dealer that sells more subarus than mazdas so don't really see them being on the cutting edge of stuff like a bigger city dealer would be or why i came on here with all the members i figured there'd be guys that might have dealt with this.
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  15. chollo9

    chollo9 Screwed the Pooch

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    Sounds like you're goin' about it the right way then.
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  16. 1greenmachine

    1greenmachine Been here awhile

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    Yeah 90% of my driving is within 15 miles of home and could get someone out to me quick if needed, i'll change to oil out this weekend, i can't believe you have almost 400k on your car.wow
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  17. GreaseMonkey

    GreaseMonkey Preshrunk & Cottony

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    Did you save any of the shiny metal parts and look at them under a microscope? Did you check them with a magnet even? Do you know if anyone ever added oil to this engine and had the foil seal fall into the motor, and you are finding the ground up bits now? As mentioned, have you even put an oil pressure gauge on it and seen what the pressures are?

    If you have not even bothered to see what the oil pressure is how can you decide that a car that isn't even yours needs a new engine? Also, if you have rebuilt engines before I am curious as to why you think it needs a new one instead of replacing the oil pump and inspecting the crank journals?

    I suspect you need to focus more on the relationship with your girlfriend and less on her car.
    #17
  18. 1greenmachine

    1greenmachine Been here awhile

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    lol i deserve that and well i jumped the boat, mainly i was looking for advice, the old oil filter i'm takeing to work with me, and i'm bringing pressure guages home with me, She got the car used with 70k, and in the last year its been treated very well with timely oil changes versus before me so who knows. ialso am bringing in the drain pan to look at the stuff..

    My main reason for not tearing it down is a 26* unheated garge, so i truthfully dont want to tear it down in here, and at 120k if its apart than it would be smart to replace alot of the wear stuff that might add up to being close to what a long block costs. I looked at the cams and they were good, looked down the timing side and didn't see anything either.
    #18
  19. buickid

    buickid Lets ride!

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    120k is nothing for most decently maintained Japanese motors. I'd be more concerned with an auto tranny letting go. Like I said, I wouldn't be too concerned unless you see continued signs.
    #19
  20. chollo9

    chollo9 Screwed the Pooch

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    I've had great luck with the first gen MPVs. My wife loves driving them and they are tanks. Add in my Dodge 4x4, an Airhead, a 250 GasGas, and a Massey Ferguson 3660 and I'm pretty solid.
    #20