Rod clearance again, (got my dial bore gage) - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech Rod clearance again, (got my dial bore gage)

Print Thread

Rod clearance again, (got my dial bore gage) #228116 02/17/09 09:01 PM 02/17/09 09:01 PM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 OP I Live Here
Moparnut426 OP I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	So I got my dial bore gage and I miked my crank, zeroed my dial bore gage, and measured my rod with bearing in and I have .002 on the button. My question is do I have to measure each rod with each bearing because I am leaving a very tiny mark on the bearing from the dial bore gage. I cant feel it with a cotton glove on. It this bearing shot, or can I use it still? Am I being too anal about the marks? Thanks Kasey

Re: Rod clearance again, (got my dial bore gage) [Re: Moparnut426] #228117 02/17/09 09:08 PM 02/17/09 09:08 PM
A Anonymous Unregistered
Anonymous Unregistered A	the proper way is to measure each journal and each bearing. don't worry about the little scratch, it'll have no effect. looks like it's coming along great.

Re: Rod clearance again, (got my dial bore gage) #228118 02/17/09 09:16 PM 02/17/09 09:16 PM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 OP I Live Here
Moparnut426 OP I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	As far as my mains, What should they be, and Im having it line hones so I should wait till its done correct? Or can I use a "book" spec, and measure the cran main the same way? Thanks Dan the Man!! Kasey

Re: Rod clearance again, (got my dial bore gage) [Re: Moparnut426] #228119 02/17/09 09:29 PM 02/17/09 09:29 PM
Joined: Dec 2008 Posts: 33 Alvadore OR A Acme Rocket member
Acme Rocket member A Joined: Dec 2008 Posts: 33 Alvadore OR	I usually check 1 rod and 1 main. But i also check all the housing bores main and rods and mike all journals. I also mike each bearing with a bearing mike. You should check the housing bores on the mains after you get it back from your shop. Sometimes it can be very tricky keeping all the housing bores the same size. I have never worried about the small scratch. Hope this helps

Re: Rod clearance again, (got my dial bore gage) [Re: Moparnut426] #228120 02/17/09 10:55 PM 02/17/09 10:55 PM
Joined: Aug 2003 Posts: 43,118 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,118 Bend,OR USA	You should be able to tell your machine shop that is doing the align hone what size you want it to end up being, on the big side of the factory specs or the small size. Ask them about that as it does have an effect on how much main bearing clearnances you end up with. I would take the crank to the machine shop and have THEM measure it with THIER micrometers and then decide on what size the main bores should end up at so you get the clearnances you want, take the main bearing with you also if you have them, if you don't have them now get them before having the work done. I measure every rod and main bearing torqued up and write them down as soon as I'm done measuring each one, I also maesure every rod and main bearing surface on the crankshaft and write them down so I can do the math to see what the actual clearnances are I'm a firm beleiver in having the clearances on the loose side instead of the tight side, .002 to .003 on the rod bearings using steel rods and .025 to .035 on the mains with stock type main caps Last edited by Cab_Burge; 02/17/09 10:57 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Rod clearance again, (got my dial bore gage) [Re: Cab_Burge] #228121 02/17/09 10:59 PM 02/17/09 10:59 PM
Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey J jamesc master
jamesc master J Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey	Quote: .025 to .035 on the mains with stock type main caps

Re: Rod clearance again, (got my dial bore gage) [Re: jamesc] #228122 02/17/09 11:05 PM 02/17/09 11:05 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: Quote: .025 to .035 on the mains with stock type main caps Its what them truck bearings call for. mike

Re: Rod clearance again, (got my dial bore gage) [Re: Cab_Burge] #228123 02/17/09 11:44 PM 02/17/09 11:44 PM
Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again Moparnut426 OP I Live Here
Moparnut426 OP I Live Here Joined: Mar 2007 Posts: 12,008 Finally a HUSKER again	Quote: You should be able to tell your machine shop that is doing the align hone what size you want it to end up being, on the big side of the factory specs or the small size. Ask them about that as it does have an effect on how much main bearing clearnances you end up with. I would take the crank to the machine shop and have THEM measure it with THIER micrometers and then decide on what size the main bores should end up at so you get the clearnances you want, take the main bearing with you also if you have them, if you don't have them now get them before having the work done. I measure every rod and main bearing torqued up and write them down as soon as I'm done measuring each one, I also maesure every rod and main bearing surface on the crankshaft and write them down so I can do the math to see what the actual clearnances are I'm a firm beleiver in having the clearances on the loose side instead of the tight side, .002 to .003 on the rod bearings using steel rods and .025 to .035 on the mains with stock type main caps Oh Im definatly going to have the shop check it out, but Im one of those guys that wants to check everything my self, I know im not a pro builder, but piece of mind goes a long ways when my foot is going through the floor on this puppy. I measured them all individually and #3 is a bit tight at .0016, #6 and #7 are both at .0018, All the rest measure from .002 to .0021. Im going to have Kecks machine in Iowa do the work, Im just curious. It doesnt help that I used to be a machinist, and took many night engine machine classes in college. Kasey

Re: Rod clearance again, (got my dial bore gage) [Re: Sport440] #228124 02/18/09 12:03 AM 02/18/09 12:03 AM
Joined: Aug 2003 Posts: 43,118 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,118 Bend,OR USA	Quote: Quote: Quote: .025 to .035 on the mains with stock type main caps Its what them truck bearings call for. mike I don't really know or care what they call for All I know is what I end up with I wish that I could get a little less sometimes but having to much clearnance is way better than having to little, like a lot of things in life Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Rod clearance again, (got my dial bore gage) [Re: Cab_Burge] #228125 02/18/09 01:12 AM 02/18/09 01:12 AM
Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey J jamesc master
jamesc master J Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey	comon Cab where's your sense of humor i knew what you meant

Re: Rod clearance again, (got my dial bore gage) [Re: jamesc] #228126 02/18/09 01:48 AM 02/18/09 01:48 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: comon Cab where's your sense of humor i knew what you meant I knew what you meant too It was just a decible infraction on the mains that we were funning you about. Dont mind me though Cab, You just keep up your good work. You relentlessly help tons of people around here.

Re: Rod clearance again, (got my dial bore gage) [Re: Sport440] #228127 02/18/09 02:58 AM 02/18/09 02:58 AM
Joined: Aug 2003 Posts: 43,118 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,118 Bend,OR USA	Quote: Quote: comon Cab where's your sense of humor i knew what you meant I knew what you meant too It was just a decible infraction on the mains that we were funning you about. Dont mind me though Cab, You just keep up your good work. You relentlessly help tons of people around here. Oops, I didn't catch the decimal error on the mains, nobody wants twenty five thousands bearing clearnances, even the top fuel or Harley guys Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Rod clearance again, (got my dial bore gage) [Re: Moparnut426] #228128 02/18/09 10:16 AM 02/18/09 10:16 AM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	Quote: Oh Im definatly going to have the shop check it out, but Im one of those guys that wants to check everything my self, I know im not a pro builder, but piece of mind goes a long ways when my foot is going through the floor on this puppy. That is the only way to go, check it all yourself. Check the main and crank journals for taper and out of round too. My crank had .003" run out when measured at the #3 main bearing and some clearances were too tight. Ended up turning the brand new crank 10/10 to get it right.

Re: Rod clearance again, (got my dial bore gage) #228129 02/18/09 01:09 PM 02/18/09 01:09 PM
Joined: Feb 2007 Posts: 5,080 organ maximum entropy master
maximum entropy master Joined: Feb 2007 Posts: 5,080 organ	Quote: the proper way is to measure each journal and each bearing. don't worry about the little scratch, it'll have no effect. looks like it's coming along great. for what is the good life if not doing things thoughtfully?

Re: Rod clearance again, (got my dial bore gage) [Re: Sport440] #228130 02/18/09 04:48 PM 02/18/09 04:48 PM
Joined: Jul 2006 Posts: 803 Fl. USA PS Arrow super stock
PS Arrow super stock Joined: Jul 2006 Posts: 803 Fl. USA	Quote: Quote: comon Cab where's your sense of humor i knew what you meant I knew what you meant too It was just a decible infraction on the mains that we were funning you about. Dont mind me though Cab, You just keep up your good work. You relentlessly help tons of people around here. Decible infraction??? Was Cab being too loud???

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1