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4.2L Stroker Build

Discussion in 'Personal Projects and Builds' started by mythorath, Oct 21, 2017.

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  1. mythorath

    mythorath Member

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    No sound when engine is cold, only shows up when engine has fully warmed up.

    I think I'm going to try to pull the oil pan and check the rod bearings to see if anything is going on down there. (I think a bearing is being / has been destroyed)
     
    mythorath, Sep 28, 2018
    mythorath, Sep 28, 2018
    #41
  2. mythorath

    mythorath Member

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    Well I spun a rod bearing.




    20181101_183106.jpg

    I'm thinking this was caused by a blocked oil passage or something similar. All of the other rod, and main, bearings looked fine and dandy. Could also have been miss-assembly, this was my first engine build after all.

    Very slight scoring on the crankshaft. Going to take it into the shop when I get some time and money to see if the crank and rod are salvageable.

    Looks like the car is sitting for a few more months.
     
    mythorath, Nov 1, 2018
    mythorath, Nov 1, 2018
    #42
  3. fasterthanyou

    fasterthanyou Active Member

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    That sucks!!!! I'm sorry to hear that... interested to find out what caused it.
     
    fasterthanyou, Nov 2, 2018
    fasterthanyou, Nov 2, 2018
    #43
  4. 6 Shooter

    6 Shooter Well-Known Member

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    IMHO, spun bearings come from not enough oil in the gap between the bearing and the crank journal. Can be caused by bearing wear, improper torque
    on the rods, or the bearing being too tight upon initial installation due to improper bearing size vs the size of the crank journal at that location. Generally, the rod bearing clearance should be about 0.0015 of an inch which allows enough space for oil to lubricate. Another possibility is inadequate assembly lube in the bearing when the motor was put together OR, NOT priming the motor with oil prior to first crankup.

    Another possibility is long term wear of 100,000+ miles and not changing oil frequently enough.
     
    6 Shooter, Nov 2, 2018
    6 Shooter, Nov 2, 2018
    #44
  5. Sideshow Bob

    Sideshow Bob Active Member

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    Did you get your motor back together?
     
    Sideshow Bob, Feb 24, 2019
    Sideshow Bob, Feb 24, 2019
    #45
  6. mythorath

    mythorath Member

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    Sorry for the lack up updates, kind of got side tracked in life for a bit.

    The bearing didn't actually spin, just shifted a bit. After talking to the machine shop we think I just messed up the install on one bearing somehow (or there was a defect that I didn't notice).
    Machine shop measured everything and they just had to polish the crank and install new bearings.

    I got the engine back in the car, it seems to be running great! (even with the stock tune still loaded)

    Currently having a problem with a transmission leak. I think it's coming from one of the transmission cooler line connections on the transmission.

    Once I have the leak figured out I'll start tuning the car, once I learn how to tune the car that is...(I have all the hardware for it)
     
    mythorath, Feb 25, 2019
    mythorath, Feb 25, 2019
    #46
  7. Sideshow Bob

    Sideshow Bob Active Member

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    I know what your talking about. I've been working on mine for 9 years now. Thanks for the update I just dropped my block off at the Machine Shop I'm looking for any thing to watch out for on my build.
     
    Sideshow Bob, Feb 25, 2019
    Sideshow Bob, Feb 25, 2019
    #47
  8. mythorath

    mythorath Member

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    From my limited experience I would offer up these tips:

    Be as clean as possible during the assembly process.
    Inspect each and every bearing very carefully (replace even if you see a speck of a defect, this is likely what caused my first build to fail)

    I think the biggest problems I ran into while assembling / installing the engine for the second time were the trans and oil dipstick tubes. I forgot to install them on the engine before installing.
    Oil wasn't bad to get back on just had to pull driver side exhaust manifold off.
    The trans dipstick tube I had to modify to install, I couldn't reach where it bolts to the back of the engine. (just install it back on trans before putting trans back in car)
     
    mythorath, Feb 25, 2019
    mythorath, Feb 25, 2019
    #48
  9. Sideshow Bob

    Sideshow Bob Active Member

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    Thanks
     
    Sideshow Bob, Feb 25, 2019
    Sideshow Bob, Feb 25, 2019
    #49
  10. Steve A

    Steve A New Member

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    Hey myth, the learning curve is always steep initially but by the time you get done you'll be a seasoned veteran. One thing I would recommend is that anytime you have the engine and transmission separated change the rear main seal on the engine and the forward pump seal in the transmission. Just cheap insurance. Obviously your rear main seal is new so that wouldn't be needed.
     
    Steve A, Mar 14, 2019
    Steve A, Mar 14, 2019
    #50
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