Another 401 build and discussion thread.... - Page 9 - JeepForum.com

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post #121 of 184 Old 03-25-2014, 11:16 AM
swatson454
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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.
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post #122 of 184 Old 03-25-2014, 12:10 PM Thread Starter
UBERK
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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.
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post #123 of 184 Old 03-25-2014, 12:24 PM
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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
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post #124 of 184 Old 03-25-2014, 12:40 PM
Matt1981CJ7
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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.
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post #125 of 184 Old 03-25-2014, 02:47 PM Thread Starter
UBERK
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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.
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post #126 of 184 Old 04-07-2014, 02:29 PM Thread Starter
UBERK
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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.
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post #127 of 184 Old 04-07-2014, 03:32 PM
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Is that the result of magnafluxing?

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post #128 of 184 Old 04-07-2014, 03:49 PM Thread Starter
UBERK
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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.
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post #129 of 184 Old 04-07-2014, 03:56 PM
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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
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post #130 of 184 Old 04-07-2014, 04:03 PM
MojoMark
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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.

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post #131 of 184 Old 04-07-2014, 04:04 PM Thread Starter
UBERK
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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.
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post #132 of 184 Old 04-07-2014, 04:09 PM
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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
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post #133 of 184 Old 04-07-2014, 05:46 PM
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Is that the result of magnafluxing?
I think he was wondering if they found the cracks when they magnafluxed the heads.
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post #134 of 184 Old 04-07-2014, 07:21 PM
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never seen or heard about cracks in that spot mostly at the exhaust port were they are flat buy the head bolts

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post #135 of 184 Old 05-09-2014, 06:36 PM Thread Starter
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Quote:
Originally Posted by Matt1981CJ7 View Post
Interesting. Be sure to post some pics of the repair.
Matt
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