View previous topic :: View next topic |
Author |
Message |
Xamon Member
Joined: Sep 18, 2012 Posts: 589 Location: South East Saskatchewan
|
Posted: Mon Jul 11, 2016 1:29 pm Post subject: Cylinder bore |
|
|
Okay just want to check my stats and get some opinions.
Pulled apart the new engine block a bit and rough measured the cylinders with my calipers.
If I understand correctly the stock bore was 3.125 (I could not find the tolerance but I may be blind) The following are my numbers #1-4 front to back and side to side.
3.14 - 3.133
3.138 - 3.131
3.139 - 3.138
3.138 - 3.135
now for the opinions should I get it done to .015 over or 0.20 over? or can you only go 2 over? Also will I have to replace pistons or just rings?
As always tanks everyone _________________ Carievale Saskatchewan Canada
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album210&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
oilleaker1 Member
Joined: May 14, 2009 Posts: 972 Location: South Dakota
|
Posted: Mon Jul 11, 2016 4:40 pm Post subject: |
|
|
Are the pistons marked .010 that were in it? If so, and the pistons look good, I'd just lightly hone the cylinders and re-ring it. Or buy new 10 over pistons and hone it. The taper as I take your measurements is fine. Any discernable ridge at the top of the bores? bad pits or rust? John |
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16262 Location: Wisconsin
|
|
Back to top |
|
|
Xamon Member
Joined: Sep 18, 2012 Posts: 589 Location: South East Saskatchewan
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16262 Location: Wisconsin
|
|
Back to top |
|
|
Xamon Member
Joined: Sep 18, 2012 Posts: 589 Location: South East Saskatchewan
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16262 Location: Wisconsin
|
Posted: Wed Jul 13, 2016 8:14 am Post subject: |
|
|
Have you taken the taper dimensions yet? If so post them. I always glass bead the pistons to clean them before dimension checks it does a better job on the ring lands and doesn't damage the piston. Do you have a copy of TM 9-1804A? If not download it free here on our downloads page.
Try to get your hands on a copy of the civvy jeep manual which gives much more detail on the L134 overhaul.
_________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
Xamon Member
Joined: Sep 18, 2012 Posts: 589 Location: South East Saskatchewan
|
|
Back to top |
|
|
wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16262 Location: Wisconsin
|
Posted: Wed Jul 13, 2016 9:46 am Post subject: |
|
|
That 0.005 out of round limits applies to the bore in the block not the piston.
If you look at page 123 in TM 9-1804A the piston diameter limits are taken only at 90 Deg's to the piston pin bore because the pistons were machined out of round new. Often referred to as cam ground. Your dimensions look like stock STD piston dimensions if you use page 123 wear limits.
Note the 0.005 piston to bore limit is the primary guide to when reboring and oversize pistons are needed.
You should be able to rent a dial bore indicator to check taper. I usually just haul my block and crank and pistons and cam to the engine machine shop and have them do the measurements with accurate tools. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
|
Back to top |
|
|
|