Another 401 build and discussion thread.... - Page 9 - 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 > Another 401 build and discussion thread....

HELLA FF75 12V 55W H7 Fog Lamps - SPECIAL OVERSTOCK SALE FBaseline 4x4 Lifetime Warranty 4340 Chromoly Axle Shaft KiJeep Gear & Install Packages!

Reply
Unread 03-25-2014, 12:16 PM   #121
swatson454
Web Wheeler
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,981
Thanks for the visual, Matt. I tend to agree.


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 Quick reply to this message
Unread 03-25-2014, 01:10 PM   #122
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
I'm not saying it's a cure for anything, I just don't see the harm in adding a little extra oil...until I can secure a deep pan.
UBERK is offline   Reply With Quote Quick reply to this message
Unread 03-25-2014, 01:24 PM   #123
AFRd_CJ5
Registered User
1976 CJ5 
 
Join Date: Jan 2011
Location: Carson City, Michigan
Posts: 689
I won't say adding an extra quart is going to cause any damage (though there are valid points here), but I will say we have seen more power on the dyno with less oil. I don't see the point in putting more than is called for. I have a 7 quart pan on my Jeep, and I actually only run 6.
__________________
'76 CJ5
434 pump gas SBC with an NX/HVH plate system
th350/Coan 5,000 converter/Dana 300 tcase
Dana 30 front with 4.56's/Dana 44 rear with 4.88's
AFRd_CJ5 is offline   Reply With Quote Quick reply to this message
Unread 03-25-2014, 01:40 PM   #124
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,694
Quote:
Originally Posted by UBERK View Post
I'm not saying it's a cure for anything, I just don't see the harm in adding a little extra oil...until I can secure a deep pan.
What I find more interesting than the 6-qt theory are the claims that the often recommended Wix filter has a defective anti-drain valve that causes dry cold starts and valve-train chatter.

I may have to test that theory.
Matt1981CJ7 is offline   Reply With Quote Quick reply to this message
Unread 03-25-2014, 03:47 PM   #125
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
Honestly, I cant but help thinking about how/why/when I spun that bearing,

The thing ran great when I first got it. Then I changed the oil, per specs with 5qts of oil and 3 weeks later BAMN. I truely dont believe the PO sold it to me with a known issue, he didnt mention using 6qts of of..nor did I ask, it couldve been a number of things, but I just keep wondering...had I researched this earlier and spent an extra $5 then would it have saved me the $5K Im spending now?

Who knows, maybe Im over analyzing everything. I do have a deep pan on the short list along with the BT serp kit but I need to spring for a Borgeson steering shaft first. Going to be working some OT this week, just going to depend on the final cost at the machine shop.

At this point I just want it up and running, get the wheels aligned, take the top off and enjoy this AZ weather.
UBERK is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 03:29 PM   #126
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
Was summoned to shop today....

While the block looks good:



Small cracks were discoverd in both heads....in the same spot:





Both are roughly the same size and according to the shop definately repairable. I opted to have them repaired for a few $$ in lieu of dropping about $$$$ for a new set. Shop owner assured me it would'nt be an issue with my build and that its a repair they've done hundreds of times.

On a good note my Hella headlights (ordered 2/17) should be on the doorstep when I get home from work tonight.
UBERK is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 04:32 PM   #127
MojoMark
Registered User
1986 CJ7 
 
Join Date: Jul 2012
Location: Tigard, OR
Posts: 133
Is that the result of magnafluxing?
__________________
MojoMark
1986 CJ7, 4.2 I6, T5
D300, 2" Lift, 33" Tires
D30 Front (Aussie Locker), AMC 20
MojoMark is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 04:49 PM   #128
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
Quote:
Originally Posted by MojoMark View Post
Is that the result of magnafluxing?
Not sure I understand your question...?

The cracks are a result of the engine overheating and were discovered through the process of magnafluxing.
UBERK is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 04:56 PM   #129
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,694
The fact that they both cracked in the exact same spot leads me to believe it's a design flaw in the heads. But a quick Google search didn't turn up similar cases. Odd.

How deep do the cracks go, and how do they go about repairing them?

Matt
Matt1981CJ7 is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 05:03 PM   #130
MojoMark
Registered User
1986 CJ7 
 
Join Date: Jul 2012
Location: Tigard, OR
Posts: 133
Quote:
Originally Posted by UBERK View Post
were discovered through the process of magnafluxing.
That was what I was asking. I had heard the term related to finding issues with blocks but had never seen a picture of an actual crack identified. I just picked up a 360 from a Waggy destined for my Jeep so I have some of these activities in my future.
__________________
MojoMark
1986 CJ7, 4.2 I6, T5
D300, 2" Lift, 33" Tires
D30 Front (Aussie Locker), AMC 20
MojoMark is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 05:04 PM   #131
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
I dont necessarily think its a design flaw per se, as much as the motor just severely over heated. From what Ive read on the AMC forum, if the heads do crack it tends to be around the lower bolt lands and pretty much ruins the head.

They arent very deep at all..... As far as repairing, I was told they would drill and tap in cast iron studs along the entire crack.
UBERK is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 05:09 PM   #132
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,694
Quote:
Originally Posted by UBERK View Post
I dont necessarily think its a design flaw per se, as much as the motor just severely over heated. From what Ive read on the AMC forum, if the heads do crack it tends to be around the lower bolt lands and pretty much ruins the head.

They arent very deep at all..... As far as repairing, I was told they would drill and tap in cast iron studs along the entire crack.
Interesting. Be sure to post some pics of the repair.

Matt
Matt1981CJ7 is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 06:46 PM   #133
OrangeCJ-5
Member
 
OrangeCJ-5's Avatar
1978 CJ5 
 
Join Date: Jul 2011
Location: Berkeley Springs, WV
Posts: 482
Quote:
Originally Posted by MojoMark View Post
Is that the result of magnafluxing?
I think he was wondering if they found the cracks when they magnafluxed the heads.
OrangeCJ-5 is offline   Reply With Quote Quick reply to this message
Unread 04-07-2014, 08:21 PM   #134
fuzz401
Registered User
1978 CJ7 
 
Join Date: Jan 2003
Location: Lancaster, Pa.
Posts: 1,757
never seen or heard about cracks in that spot mostly at the exhaust port were they are flat buy the head bolts
__________________
1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
http://img2.photobucket.com/albums/v...slideshow=true
http://photobucket.com/albums/v31/fu...slideshow=true
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
fuzz401 is offline   Reply With Quote Quick reply to this message
Unread 05-09-2014, 07:36 PM   #135
UBERK
Registered User
1976 CJ7 
 
Join Date: Jun 2013
Location: 480, AZ
Posts: 595
Quote:
Originally Posted by UBERK View Post


Quote:
Originally Posted by Matt1981CJ7 View Post
Interesting. Be sure to post some pics of the repair.
Matt
UBERK is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






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.