Slant Six Forum
https://slantsix.org/forum/

Cam installation issue
https://slantsix.org/forum/viewtopic.php?t=21370		 Page 1 of 1
Author:  65deuce [ Mon Jan 08, 2007 6:07 pm ]
Post subject:  Cam installation issue
Been lurking around here a while, looks like a nice group of fellas, so I'll ask for a bit of help, er suggestions.

I started building the slant for my newly acquired 69 Dart tonight after picking up the goodies from the machinist. All LOOKED well but when I went to install the cam, I couldn't get it into the last bearing, pushed it a bit by hand (not hard though built lots of V-8's, I know they should slip right in) but to no avail. When I pulled the cam out I noticed that the bearing feels like it has a high spot beneath it, right at the oil hole. Brand new bearings, brand new solid lifter Comp cam, which floats in the first three journal quite freely, also the #1 bearing is fully grooved is that normal? Whats up here? Machinist error?
Author:  Greg Ondayko [ Mon Jan 08, 2007 6:23 pm ]
Post subject: 
I had a similar Problem 2 weeks ago with my Self- induced Motor teardown / buildup.

1. Yes there are grroves in the #1 Bearing shelll.

2.Thre are 2 Possible causes to your dilemma - which both require you to return to the machine shop where you got the work done with block and cam in hand....maybe not literally with the block.. unless you can hold 200# in one arm like a bag of sugar..

1. either #2 and #3 Bearing shells got swapped - Meaning #2 Bearing is in place of #3 baring and vice/versa or-


2. (this is what I did.) The #4 Rear Bearing went in crooked, Got Tweaked, and was unusable - The Solution : Get a new bearing set and drive #4 in square. (fixed My stupid Screwup)




Others will chime in below this line


____________________________________________________________


Greg
Author:  SlantSixDan [ Mon Jan 08, 2007 6:28 pm ]
Post subject: 
The bearing swap/cockeyed issue is probably what is at work here, but, given my past experience and the ongoing frequency with which people have trouble with Comp Cams having screwed up even the basic stuff, the cam should probably be looked at (i.e., measured) extra-carefully.
Author:  65deuce [ Mon Jan 08, 2007 6:47 pm ]
Post subject: 
Oyyyy, I knew someone would suggest further scrutiny of the cam. I would never use Comp on a V-8 build but it was the most accessible cam for the slant. I guess I'll be taking back my 200# bag O'sugar back in the mornin'.....resolution will be forth comin' by God.

Oh also I took .020 off the deck and .060 off the head, should this require anything other than a stock pushrod? What can I expect for compression ratio with a Felpro gasket....8.75:1??
Author:  DusterIdiot [ Mon Jan 08, 2007 7:44 pm ]
Post subject:  Stock compression?
Quote:
Oh also I took .020 off the deck and .060 off the head, should this require anything other than a stock pushrod? What can I expect for compression ratio with a Felpro gasket....8.75:1??
This all will depend on how far down the piston is in the bore at TDC, there are lots of "slop" in the deck height on slants so you may have not even started out with "stock compression"...

As it stands, with no overbore, and .080 off the deck/head then the Felpro gasket takes back about .040...so you're up about .040... so if you say started with an average set of estimations :roll: like .18 deck height and a combustion chamber of 52cc and did those mods, then yes, it'd be about 8.75...actual results will vary as to what your deck height really is, and chamber measurements...


Good luck on the cam bearing mix up, oyyy is right!

-D.Idiot
Author:  65deuce [ Mon Jan 08, 2007 7:50 pm ]
Post subject: 
No it went .030 on the bore, maybe tommorow I'll get to see how deep the slugs are.
Author:  BigBlockBanjo [ Tue Jan 09, 2007 9:10 pm ]
Post subject: 
hhmmmm....
That's interesting....because my #1 bearing has a sorta-similar problem.
I went to install the cam, and it was fine until the front journal started into it's bearing. It went about 3/4 of the way, then stopped. :? I thought "Well, the thing is in there crooked.." So to check it, I took the cam out, and tried to put it in "backwards", just to make sure. The cam journal went in about 3/4. So.....I guess the bearing is bad? It's hard for me to believe, Clevite bearings and all. But I guess anything can happen.
It will force into place, but I have to put both hands on the cam gear to turn it. That's too much for me!
Author:  emsvitil [ Tue Jan 09, 2007 9:32 pm ]
Post subject: 
Quote:
hhmmmm....
That's interesting....because my #1 bearing has a sorta-similar problem.
I went to install the cam, and it was fine until the front journal started into it's bearing. It went about 3/4 of the way, then stopped. :? I thought "Well, the thing is in there crooked.." So to check it, I took the cam out, and tried to put it in "backwards", just to make sure. The cam journal went in about 3/4. So.....I guess the bearing is bad? It's hard for me to believe, Clevite bearings and all. But I guess anything can happen.
It will force into place, but I have to put both hands on the cam gear to turn it. That's too much for me!
could be the cam journal.......
Author:  Charrlie_S [ Wed Jan 10, 2007 4:41 am ]
Post subject: 
Most of the time, when a cam will not install into the bearings, properly, the broblem is not the cam or the bearings. It is a problem with the bearing installation. The old bearing are driven out and the new bearing are driven into place. It is very easy to "nick" the Block when driving out the old bearing, and create a high spot, which will deform the new bearing. Also when driving in the new bearing it is possible to "peen" the edge of the bearing, if you are not carefull.

Just a tip: before installing the new bearings into the block, slip them on the cam, and check for fit, and that the oil holes on the #4 cam journal line up with the holes in the bearing.
Author:  DonPal [ Wed Jan 10, 2007 5:38 am ]
Post subject: 
I had a "cam wouldn't go in" problem and found that the block was not line bored properly such that the centerline of each cam bearing journal were not in line by as much as .060. It cost to get it line overbored & bushed so that the next set of installed cam bearings were inline. I suspect it's a rare event.

How did they get the first cam in you ask? :?: ......They hogged out one side of the cam bearing to slip the cam in!! :shock: No wonder the engine had low oil pressure!! :!: A Plymouth outsourced component better idea.....
Author:  65deuce [ Wed Jan 10, 2007 4:30 pm ]
Post subject: 
Cam install has been resolved....there was a burr under the bearing. Built the short block tonight but forgot to check the deck height, what should I expect, I had them take off .020 but I don't know what stock should be?
Page 1 of 1 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/