Cam Bearings
Thread Starter
|
Freshman User
Joined: Jul 2004
Posts: 35
Likes: 0
From: SF bay area
Cam Bearings
Rebuilding a 460. Engines been bored 20 over, new pistons etc. etc..... installed the cam bearings and went to install cam and it wouldn't fit.
Tried to chamfer the edges of the bearings and still no fit. Popped the bearings out and tried them over the cam journals, fit OK. Not as good as I'd like, but they slid over the journal. Popped them back into the block and cam wouldn't fit.
Mic'ed the cam journal at 2.124" which is spec in the book so the cam is OK, but when I mic'ed the ID of the installed bearings they were at 2.122 to 2.124-5. These are brand name bearings.
Anybody ever have this problem? Anybody know what the ID should be for uninstalled cam bearings?
I believe that crush is .001" per inch of diameter for a pressed fit. So I'm thinking that at 2.1", crush would be about .002", so the uninstalled ID should be 2.126-7.
Any ideas. I'm going to order another set and try it again.
Tried to chamfer the edges of the bearings and still no fit. Popped the bearings out and tried them over the cam journals, fit OK. Not as good as I'd like, but they slid over the journal. Popped them back into the block and cam wouldn't fit.
Mic'ed the cam journal at 2.124" which is spec in the book so the cam is OK, but when I mic'ed the ID of the installed bearings they were at 2.122 to 2.124-5. These are brand name bearings.
Anybody ever have this problem? Anybody know what the ID should be for uninstalled cam bearings?
I believe that crush is .001" per inch of diameter for a pressed fit. So I'm thinking that at 2.1", crush would be about .002", so the uninstalled ID should be 2.126-7.
Any ideas. I'm going to order another set and try it again.
Elder User
Joined: Dec 2004
Posts: 769
Likes: 0
From: Idaho cda postfalls
ive never seen them not fit before i know they are tight but not that tight i would maybe got get some new bearings and mic them to see what they are too. try a diff brand than what you have first.
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
The 460 cam bearings are the same size from one end to the other I have seen them put in cocked and that makes them real tight. Drive those out get a new set and mic everything then install them with a tool that aligns them up concentric to the cam bore
Thread Starter
|
Freshman User
Joined: Jul 2004
Posts: 35
Likes: 0
From: SF bay area
That was my first thought that they might be cocked. I mic'ed the bearing edge from the face of the cam bore to the edge of the bearing to make sure it was square. It was. I have a K-Line cam installation tool. Should get the new bearings tomorrow by FedEx so I'll try it again. I'll put in a call to DANA Corp and talk with one of their engineers about it if I have the same problem.
Thread Starter
|
Freshman User
Joined: Jul 2004
Posts: 35
Likes: 0
From: SF bay area
Found the problem. The cam bearing closest to the timing chain has two holes, one from the oil filter and one to the cam journal. The area where the oil from the filter comes through the block had a slight bump in it that caused the bearing to distort out of round. Filed out the bump, installed the new bearings and cam goes in without a problem.
Thread
Thread Starter
Forum
Replies
Last Post
jesse282
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
26
Aug 30, 2017 10:51 PM
jesse282
1961 - 1966 F-100 & Larger F-Series Trucks
56
Aug 28, 2017 06:49 AM
jesse282
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
8
Jun 20, 2017 04:32 PM
ultraranger
1967 - 1972 F-100 & Larger F-Series Trucks
18
Feb 22, 2016 03:27 PM
