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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Tue May 29, 2012 10:38 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Cylinder wall scoring - bad news?
Look elsewhere. That thing should be spotless if it was just bored. Also, why did they put the old pistons back in? Is everything else in there used as well...rings, bearings etc ?
I'd just dump it or take it to a real machine shop and see what they can do.
_________________ Sold: 1970 w/427W Injected Stroker
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Tue May 29, 2012 10:52 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
It can be bored but might not clean up until .060" or more over. If any of the scratches are more than .015" deep consider it a boat anchor.
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Wed May 30, 2012 12:05 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 12:43 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
If you know that the block that was in your rig hasn't been rebuilt....I'd start with that one. .030 is really as far as you want to go. Rebuild kits that include most all the internals can be had for around $300 from Summit and that includes new pistons etc.
_________________ Sold: 1970 w/427W Injected Stroker
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Wed May 30, 2012 5:01 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
yup we are going to recycle the block.. pulling the rest of it apart today to see what cam and other bits are useable...
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 10:03 am |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
Good plan. That 5th picture scares me....looks like they had sand in the oil. I wouldn't trust any internal part of that engine (including cam).
_________________ Sold: 1970 w/427W Injected Stroker
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Wed May 30, 2012 11:50 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
ya i will pull the cam and shoot some pics.. the timing chain looks new as does the oil pump.. and the cam has lots of goop on it.. like install stuff.. so who knows.. anyway i will post up later tonight.
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 11:59 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 8:13 pm |
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ZOSO
Moderator
Joined: Mon Nov 15, 2010 5:58 pm Posts: 3906 Location: Henderson, Co
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
Measure the bore. Looks almost like they just pulled it apart and cleaned the pistons. Re ringed it with new bearings.
_________________ Rob
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
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Wed May 30, 2012 8:30 pm |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 8:36 pm |
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airbur
Official CCB Member
Joined: Wed Sep 29, 2010 8:39 am Posts: 1721 Images: 0 Location: Castle Pines, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
The oil pump is cheap.....don't chance it.
_________________ Sold: 1970 w/427W Injected Stroker
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Wed May 30, 2012 9:02 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
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Wed May 30, 2012 9:04 pm |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
so i could use the cam and timing chain in my 78 block then junk the rest?
I do plan on going EFI, either on my 78 block with exploder upper and serp or find a roller block and build that up with explorer upper and serp..
I have a Comp XE258HR cam and crane 1.6 roller rockers under my bench i have yet to use.. so might be fun to go roller..
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Wed May 30, 2012 10:10 pm |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
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Thu May 31, 2012 8:07 am |
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Booger
Official CCB Member
Joined: Thu Dec 23, 2010 6:55 pm Posts: 809 Location: Broomfield
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
A few things: Don't leave the crank laying on it's side. Causes it to bend. Bolt the flywheel/flexplate to it and stand it up or leave it in the block supported by the mains. If the cam is used and you reuse it did you mark which lifter went to which lobe? Can cause the lobes to go flat. Check the lifter surface with a straightedge and see if you see any dish to the lifters if so replace em.
Most pistons I've seen have the overbore size stamped on the top. Like Zoso said it might just have been honed and maybe new rings and bearings. Look at the back side of the bearings it should have a number like 10 or 010 or something if crank was turned.
I've run a few engines that we just removed the ridge at the top of the bore, new rings, bearings and seals (not new cam bearings), hone bores, clean pistons and go. Is it going to run 100k miles probably not but it will get from A to B. It'll run and might use a little oil but shouldn't be a mosquito fogger.
Now if your wanting to put it in the old Bronco check the bore and see if it's been bored. Some older engines could take more overbore than newer engines. Had a buddy in high school that bored his Buick somewhere around .100 over. Walls were thin but that thing ran like stink. Seems he bought pistons for a .030 425ci when his engine was a 401ci. Machine shop bored it out and they weren't sure how long it would last but it made it through a crazy high school kid who did a lot of street racing with it.
_________________ Bob - Turning hydrocarbons into noise since 1970
Spiritual owner of the now Zoso mobile (1974 Bronco Ranger - EFI 351W-4R70W-ARB front and rear-STC softtop- High Country hood-3 1/2" WH lift- Cross inboard rear shock mnt- Duffs bumpers- Warn 8274- 33's- Cheby disc conversion)
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Thu May 31, 2012 6:18 pm |
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Lila76
Official CCB Member
Joined: Mon Oct 24, 2011 12:02 pm Posts: 111 Images: 0 Location: Aurora, CO
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
Why are the pistons painted blue on top? That scoring is no bueno. Sorry man!
_________________ What did you learn?
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Thu May 31, 2012 7:50 pm |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Fri Jun 01, 2012 9:33 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Fri Jun 01, 2012 9:34 am |
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Viperwolf1
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
Only reason to save the crankshaft is if it's better than the next one. It won't fit in a roller block though.
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Fri Jun 01, 2012 9:55 am |
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landshark
Official CCB Member
Joined: Fri Oct 14, 2011 12:16 am Posts: 3942 Location: Denver, Wash Park Area
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
_________________ 1976 Bronco "Green, Yellow, whatever", 1969 Bronco "Red", 1972 Bronco Stocker "Kind of Blue/Grayish"
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Fri Jun 01, 2012 10:06 am |
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Booger
Official CCB Member
Joined: Thu Dec 23, 2010 6:55 pm Posts: 809 Location: Broomfield
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![Post Post](./styles/acidtech/imageset/icon_topic_latest.gif) Re: Cylinder wall scoring - bad news?
Chris about the cam and lifters - you would be better off just buying all new than keeping a few.
_________________ Bob - Turning hydrocarbons into noise since 1970
Spiritual owner of the now Zoso mobile (1974 Bronco Ranger - EFI 351W-4R70W-ARB front and rear-STC softtop- High Country hood-3 1/2" WH lift- Cross inboard rear shock mnt- Duffs bumpers- Warn 8274- 33's- Cheby disc conversion)
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Fri Jun 01, 2012 8:16 pm |
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