Rebuilt AMC 304 crank won't turn manually - Page 3 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > Rebuilt AMC 304 crank won't turn manually

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201FS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 01-22-2013, 11:37 AM   #31
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
I have access to both. Just bought a digital one not too long ago but still have a few analog ones too. that sounds like what swatson was saying to do. I'll do that tonight and hope for the best. I'll follow up with results tonight or tomorrow. Thanks guys

Greekcj5 is offline   Reply With Quote
Unread 01-22-2013, 12:25 PM   #32
CSP
Registered User
 
Join Date: Aug 2002
Location: Colorado
Posts: 11,819
Good luck with it! I'd much rather use mics than Plasti-gage. Plasti-gage saves guys who don't have mics the expense, but it's no substitute if you have them.
CSP is offline   Reply With Quote
Unread 01-22-2013, 12:29 PM   #33
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
Awesome. Not like the plastigauge is expensive but its one last thing i have to buy and i trust my micrometer more seeing as I've used it hundreds of times already. Thank you
Greekcj5 is offline   Reply With Quote
Unread 01-22-2013, 01:00 PM   #34
swatson454
Mall-crawlin' Hot Rodder
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,728
That's definitely the right way to go. I guess I should've asked if you had access to mics.


Shawn
__________________
Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now   Reply With Quote
Unread 01-22-2013, 01:12 PM   #35
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
I'll post how it went tonight or tomorrow. Thanks for the help.
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 10:28 AM   #36
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
Morning gents. So here's the latest. Seeing as the pistons were already installed i tried plastigauge first. The clearances are as follows:
Cyl 1-.001
Cyl 2-.0013
Cyl 3-.001
Cyl 4-.0013
Cyl 5-.0015
Cyl 6-.0012
Cyl 7-.001
Cyl 8-.001

In all it looks like i have four looser ones and four tight ones. Not sure how to arrange them to work though. Any suggestions?
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 10:54 AM   #37
swatson454
Mall-crawlin' Hot Rodder
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,728
That looks awfully tight, buddy. I don't have an AMC manual but I'd expect to see closer to .0018 to .0022 ish. What does the book say?

You may need to pull the pistons and mic everything.


Shawn
__________________
Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now   Reply With Quote
Unread 01-23-2013, 11:04 AM   #38
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
The book its pissing me off cause all it says is tighten the caps to the torque specs listed in the figure provided. I might try getting a Haynes instead of the Chilton i have unless there's a better alternative. I'm also gonna try replacing the.001s with the old bearings and check the clearance with those on. Maybe the crank didn't get ground down to .020 under after all.
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 11:08 AM   #39
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 9,884
Spec is .001 - .003, so he's definitely on the tight side of spec. Mine were all around .002. Connecting rod torque spec is 33 ft-lbs.

Do the pistons move smoothly and freely in the cylinders when they aren't connected to the crank?

What did your main bearings plasti-gauge at?

Matt
Matt1981CJ7 is offline   Reply With Quote
Unread 01-23-2013, 11:23 AM   #40
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
Everything moves nice when not connected. Checked ring gap and it was about.0016 which is barely bigger than spec. Crank also moves freely without anything connected. Forgot what mains gauged at but i remember them being within specs. Another thing, my Chilton says my end cap torque is 30 ft-lbs max but you say its 33 so that throws my gauging off by 3 ft-lbs which means there's probably less than .001 for a few of them.
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 12:04 PM   #41
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 9,884
I wouldn't waste your time trying the old bearings, or even .010 bearings, they will be too sloppy.

The reason I asked about the main bearings is the rear main journal has a different spec. (.002-.004") versus journals 1-4 (.001-.003").

Mains torque to 100 ft-lbs.

Matt
Matt1981CJ7 is offline   Reply With Quote
Unread 01-23-2013, 12:20 PM   #42
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
I torqued the mains to 100 and it moved pretty easily. What about using the .020 on the rod end and one of the old ones on the cap to give it a little more clearance? Other than that the only thing i can think of is taking it back to the machine shop which i really don't want to do at this point.
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 12:53 PM   #43
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
I just found this web site that says the rod end torque is 35-40. i need to know what the torque should be before i can continue cause if it's 33 I'm 3 ft-lbs low and if it's 35-40 then I'm 5-10 ft-lbs low which makes a huge difference.
Greekcj5 is offline   Reply With Quote
Unread 01-23-2013, 12:58 PM   #44
82JeepCJ7
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 4,780
Is there any motor oil on the pistons or are they in there dry?
__________________
Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
82JeepCJ7 is offline   Reply With Quote
Unread 01-23-2013, 01:14 PM   #45
Greekcj5
Registered User
1973 CJ5 
 
Join Date: Aug 2011
Location: Ramona, CA
Posts: 106
I loaded each one with assembly lube
Greekcj5 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.