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what can I find aout about the engine wear from these photo's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Jan 3, 2002.

  1. solowookie

    solowookie 1/2 ton status

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    what can I find aout about the engine wear from these photo\'s

    ok guys, I know some of these aren't the easiest to see, but the wear marks can be made out. I'm wonder what I can ascertain from the wear patterns in the's photo's...

    http://www.vtengineering.com/ck5/wear-2.jpg
    http://www.vtengineering.com/ck5/wear-4.jpg
    http://www.vtengineering.com/ck5/wear-6.jpg
    http://www.vtengineering.com/ck5/wear-8.jpg

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: what can I find aout about the engine wear from these photo\'s

    It's hard to tell from the photo's but it looks like the oil had "contaminents" in it. The marks on the bearings look to be more like scratches rather than heat scoring, so it looks like the oil was OK (no viscosity breakdown), but some of the marks on the bearings indicate foreign matter (dirt, metal, etc) was in there. The carbon on the pistons is normal for carbureted or high mileage engines (for the most part) and the discoloration on the skirts seems normal (unless there is discoloration of the cylinder walls, but it doesn't seem like there would be from the pictures). You can have the crank journals turned and use oversized bearings to get rid of the scratches assuming I'm reading the photo's correctly. Well keep us updated.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  3. solowookie

    solowookie 1/2 ton status

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    Re: what can I find aout about the engine wear from these photo\'s

    I have an engine rebuild book here, and from what I would see most of the wear patterns looked to be contaminants...

    I assume this means that the crank will require grinding???

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: what can I find aout about the engine wear from these photo\'s

    If you can run your fingernail across the journals, and they catch on the grooves, most likely it will need grinding. The crank I have now had bad looking bearings, and the crank was slightly grooved, but a polish job from the machine shop took care of it. Actually, it didn't completely remove the grooves, but my fingernail no longer caught on it. I'm sure for extreme usage, that might be a problem, but I'd have to think that as long as the surface was smooth and the "contact patch" was still large, (not too many grooves) it won't be a problem for a "mild duty" motor.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  5. solowookie

    solowookie 1/2 ton status

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    Re: what can I find aout about the engine wear from these photo\'s

    Hey,

    Dorian thanks for the tip!!! (sounds like a pretty easy rule of thumb! [​IMG])

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  6. solowookie

    solowookie 1/2 ton status

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    Re: what can I find aout about the engine wear from these photo\'s

    a friend of mine that is a really good mechanic came over, and mic'd the block out for me. I'm going to hone the block, and make sure I don't have any bare spots, but there is a good possibility I may not have to bore this thing... (it doesn't look too bad)

    there were a couple spots on the crank that my fingernail caught on, one just barely and the other one pretty good. I think I'm just going to have it polished though, and run the thing.

    if I have a little luck on my side I'll be looking at a master kit with a hot tank, and crank polish. this guy even has a tool to install the cam bearing so (I'm crossing my fingers).

    northern auto parts master kit $200 bucks; hot tank &amp; crank polish around a $100 bucks... total project around $400 (if I have a little luck running on my side)

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: what can I find aout about the engine wear from these photo\'s

    yup #4 says it all. I would probably turn the crank and bore the block. A lot easier to do it now then down the road when the motor is knock'n or drinking oil like mad

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  8. Mudzer

    Mudzer 1/2 ton status Author

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    Re: what can I find aout about the engine wear from these photo\'s

    Actually to be honest, I think Dorian has the right idea. Depending on if your bearings were standard, sometimes you can get .001 and .002 undersized bearings and just polish the crank. It all depends on the current clearances. From looking at the rod journal shot on the crank, it looks to have very little wear because no major ridge between where the two bearings rode. No matter how much I blabber here, you still need to get out a mic and check the journal surfaces on all journals. Then use that book to determine how much the crank is worn from original tolerances. Cant tell much just from looking at the pistons. Seems they have had some slight wear on the skirts, really depends if during the rebuild process, if they even used new pistons. Without knowing what the engine information its tough to tell. If this was a used motor which has never been rebuilt, I would say you have found a great crank to work with and just do the right block prepping and you should be good to go. It is not poor engine building practice by having the crank polished by a competent machine shop and using the undersized bearings as long as you check everything closely.

    Mudzer 1978/91 K5
    <font color=blue><a target="_blank" href=http://www.mudzer.rockcrawler.com>www.mudzer.rockcrawler.com</a></font color=blue>
     
  9. solowookie

    solowookie 1/2 ton status

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    Re: what can I find aout about the engine wear from these photo\'s

    thanks MudZer... I had the block mic'd and it is measuring slightly under 4.00 (not sure how much under I wasn't told). I think my first action is to have the crank either polished or ground.

    in the meantime I'm going hone the cylender, and see how that turns out... then make a decision on having the cyl. bored or not. then I'll order my master kit before I have the block hot tanked etc.

    I have access to a cam bearing installation tool so I'll do all the assembly myself.

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     

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