To re-ring or not to re-ring

Posted by 96Formula6spd, Mar 14, 2017
Cylinder Head & Short Block - 4G63 cams, valvetrain, pistons, rods, stroker kits, 6-bolt swaps, hybrids, etc. Read this Forum's Strict Guidelines.

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  1. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Figure I would ask around. So I am putting a 6 bolt back together. Engine had 12k or so on it. It blew a head gasket in 2009 and has been sitting since. Anyways at this point the crankshaft is out of the car and at the machine shop as the engine needed new bearings and the old crankshaft was trash. Guy was running no harmonic balancer.

    So at this point the head gasket job has almost turned into a full rebuild. The engine was built by slow boy racing and the work has been pretty bad. I have thought of blowing the budget and pulling the pistons out and putting new piston rings in with a fresh hone. I did find that this has some 85.5mm Wiseco pistons, so I guess that is a plus. Here is a picture of the bores today. Would you guys run these or just go ahead and rebuild it all?

    17342087_10208507527394326_567196312_o_zps5kh6fmtf.jpg

    17310718_10208507528034342_1068533805_o_zpswkwbmgrr.jpg

    17273185_10208507527914339_1978964117_o_zpsmmpuvl1w.jpg

    17200743_10208507528114344_1326528224_o_zpsyxzm0van.jpg
     
    #1
  2. donniekak

    donniekak DSM Wiseman Surprise, Arizona

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    Needs a hone and new rings, which is only a couple hundred bucks. I would more importantly check the pistons for cracks. The old regular wiseco pistons are notorious for cracking where the skirt meets the pin boss.
     
    #2
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  3. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Will be checking the pistons over with a fine tooth. Figure these receipts were from 2005 on the rebuild. Looks like time for a home and re-ring. Time to blow the budget even if it's only a couple hundred bucks.
     
    #3
  4. 94awdcoupe

    94awdcoupe Proven Member tampa, Florida

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    those bores are ruined. re-ring wont help. this is common for early wiseco pistons. top of piston above rings expands too much and contacts bores. needs a proper rebore and fresh slugs to fix it.
     
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  5. gsxeclipse102

    gsxeclipse102 Proven Member carmel, New_York

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    Check those vertical scratches. If you can catch them with your finger nail its going to need more serious work. Other wise a good hone and rings will be fine
     
    #5
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  6. Dstarperformance01

    Dstarperformance01 Proven Member Mustang, Oklahoma

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    +1 for hone and rings IF vertical scratches aren't bad like @gsxeclipse102 stated
     
    #6
  7. donniekak

    donniekak DSM Wiseman Surprise, Arizona

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    While I think honing .002" off the bores would clean them up and get them to the kind of spec that would keep a piston from scuffing them so bad again, my money is on the pistons being cracked anyway.
     
    #7
  8. zedicus

    zedicus Proven Member Garden city, Kansas

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    if they are cracked call wiseco, they are a good company to deal with and they might replace them or at least offer you a good deal on the revised style.
    heck even if they are not cracked call wiseco and tell them what you are seeing, i have had good luck dealing with them even when i was not the original purchaser of the pistons.
     
    #8
  9. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Yaye sounds like the pistons are coming out Monday. Out of town till then. Just as I thought I could actually get this car running again it comes back to bite me....again and again and again. To bad it's 85.5mm bore. Otherwise I would just find a stock set to throw in. I will be calling Wiseco but a new set from them is out of the budget. Doubt they will replace them. Might get a cheaper replacement set, but again out of budget. Doubt there are cheap replacements. Stock 6 bolt were forged pistons correct? I bet the cheaper kits are cast.

    Man and I was staring down some cheap 2.4 6 bolt blocks and cranks but said be smart keep the 2.0.
     
    #9
  10. Dstarperformance01

    Dstarperformance01 Proven Member Mustang, Oklahoma

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    @96Formula6spd sounds like you have a dilemma on your hands.


    Check your inbox :sneaky:
     
    #10
  11. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Well good thing I pulled these pistons. They are trash. No cracking that I can find but major scoring. Also rings were almost lined up. Not even a 1/4 turn between the #1 and #2 rings. Tops are chewed up and line up with some of the big scoring marks. This engine was not happy. Took some pictures. The skirts are very worn on one side. Lots of pictures below

    17379879_10208555097623552_532769388_o_zpsy7vcz0jk.jpg

    Cylinder #1

    17373168_10208555097663553_2003983792_o_zpsoe8nxqhd.jpg

    17431374_10208555097703554_1709376986_o_zpsd5dptudh.jpg

    Cylinder #2

    17379720_10208555097743555_1274262071_o_zpsvhsbw9pz.jpg

    17431601_10208555097863558_1863272635_o_zpsbrr9re27.jpg

    Cylinder #3

    17408367_10208555097903559_1497648610_o_zpsrz0rbe8e.jpg

    17408484_10208555097943560_432960144_o_zpsf0s87zlg.jpg

    Cylinder #4

    17453469_10208555097983561_534065102_o_zpsz8plja9w.jpg

    17453308_10208555098063563_2042535671_o_zpsl3t7gkss.jpg


    Top of pistons look like this. And this was not even the bad one. You can also see loads of blow by. I have been in 170k motors that were way better than these.

    17431839_10208555098503574_574960865_o_zps1bq2vidp.jpg

    Big scratches. So can't tell if this is a Wiseco problem or something else. All I know is these pistons are trash. Skirts are extremely worn. I think this engine was vibrating to death. Cylinders are looking pretty bad as well. Chances are its going to need a bore to at least 86mm or .030 over. So much for a 12k mile engine.
     
    Last edited: Mar 20, 2017
    #11
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  12. Boomdeeze

    Boomdeeze Proven Member Independence, Minnesota

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    Did you compression test his motor before it was pulled? I had vertical marks on my cylinder walls as well but I could not catch my fingernail on them. I also run Wiseco's the 1400HDs so I am wondering if this is why I have those marks. It would be interesting to know the compression these pistons were creating.
     
    #12
  13. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Since my camshafts were made of rust no. I did not turn anything till the cylinder head was off the engine. Then I put oil on the cylinders before turning the crankshaft at all. Car has never ran since I have owned it. Was bought as a project car but even now I'm rethinking that.
     
    #13
  14. Dstarperformance01

    Dstarperformance01 Proven Member Mustang, Oklahoma

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    That's crappy bro. I sorry to hear that news that NOBODY EVER wants to hear. :cry: I feel for ya!
     
    #14
  15. donniekak

    donniekak DSM Wiseman Surprise, Arizona

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    IMG_2065.JPG Flip them upside down and look at the area where the skirt meets the pin boss, I bet they are cracked.
     
    #15
  16. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Yep it sucks. Got to decide on what to do with this car. Have debated a part out before and or selling it. I just decided to fix it. Now this has shown up. What to do, what to do.

    Checked all four when they came out. None had cracking. Lots of scoring but no cracks.
     
    #16
  17. donniekak

    donniekak DSM Wiseman Surprise, Arizona

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    That's odd. Usually the pistons that get installed to tight also have the cracks. Part of the problem is that wiseco spec'd those pistons for .0025" clearance. I've always had them installed to looser specs.

    The newer hd pistons have an extreme barrel shape to prevent the crown from swelling.
     
    #17
  18. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    I was waiting for it but never saw anything. I went out a while back and double checked. Granted these are still garbage. Started looking at other engine options but man have these engines shot up in value on the used market. Even a jdm engine these days is around 1500 for a cheap one. 6 bolts are over 2k if you can find them. That is way out of budget.
     
    #18
  19. donniekak

    donniekak DSM Wiseman Surprise, Arizona

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    You should be able to find a 6 bolt short block for a few hundred dollars. Try one of our supporting vendors like miller import.
     
    #19
  20. bastarddsm

    bastarddsm Proven Member Mendota, Illinois

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    Clean them up really good, file the burrs off, have them recoated. have a machine shop hone the cylinders .001-.002 and put it back together with new rings.
     
    #20
  21. jery1234

    jery1234 Proven Member Toronto, ON_Canada

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    ^^ this
     
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  22. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Have been watching his posts. I have debated a doing the used engine option. I know his 6 bolt selection is low. At least complete bottom ends. Heck a lot of parts I needed for this 6 bolt came from him. Everything was good minus the rack and pinion( I could have exchanged it but gas would cost more than the parts to rebuild it).

    Could do this, but the coating part will be out of budget. At least right now. Going to look around at options. Right now I will pick the crankshaft up and go from there. Probably means the car is going to sit for another few months or more.
     
    #22
  23. bastarddsm

    bastarddsm Proven Member Mendota, Illinois

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    You could probably get away with smoothing them up with some 400grit wet/dry sand paper. If you sent them to me clean and ready to go I could coat them for $75. It's a tough call weather it's worth it.
     
    #23
  24. 96Formula6spd

    96Formula6spd Proven Member Greenville, South_Carolina

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    Not a bad idea. I looked again and there are 2 pistons with multiple deep groves straight to the top ring. These will not buff out. From a machine shop I trust means these pistons are junk. If you were on a super budget maybe or needed it back together today. But he says scratches to the top ring give exhaust gases a place to hit that ring. Add in boost and you put even more pressure on that scratch. But for something that was planning on being a DD these pistons will not be going back into any of my engines. Especially with the known problems. You could get lucky with coating but at this point its not worth it to me.
     
    #24
  25. bastarddsm

    bastarddsm Proven Member Mendota, Illinois

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    I ran a set of wiseco's that looked almost that bad for a long time at ~600whp.
     
    #25

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