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Unread 07-26-2010, 05:49 PM   #16
motiv8ya
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Join Date: Dec 2008
Location: Las Vegas, Nevada
Posts: 905
Those chunks in the oil pickup could be the plastic valve seals that have deteriorated and broke apart.

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Unread 07-26-2010, 07:36 PM   #17
fuzz401
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try here to have your damper rebuilt or to buy a rebuilt one

Damper Doctor Online

your crank is most likly going to need reground groves in the bearings and a lot of copper showing
on the back of the bearing there should be the size the bearings

your rod caps have the machine shop spot face them were the nuts go to give them a flat surface to seat against and new rod bolts installed

the parts in the oil pick up if they are metal they could be from the cam bearings
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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
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Unread 07-26-2010, 07:50 PM   #18
TKFireman
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Thanks Fuzz401, I sent an email to the damper doctor.

I appreciate the rest of the advice too. Have you had any problems with the 401 and the dana 30 front end with 37's?
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Unread 07-26-2010, 08:02 PM   #19
fuzz401
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I never realy ran it with the 401 just a 360 and it held up
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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
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Unread 07-26-2010, 09:07 PM   #20
82JeepCJ7
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There are several places that will buy your harmonic balancer to rebuild it. There is a place just up the road from me that does that and they offer rebuilt balancers cheap.

Welcome to Perpetual Balance // Your Engine Balancing Specialists!

401 AMC REBUILT DAMPER
Date: 2010-07-21, 6:09AM PDT
Reply to: sale-2wdd4-1854698877@craigslist.org [Errors when replying to ads?]

REBUILT HARMONIC BALANCER Part number (AMC-401) fits AMC 1971 to 1976 401 cubic inch engines. MANUFACTURES WARRANTY , Complete engine balancing available,


888-339-9009 or 360-435-1701

If applicable: Washington sales tax applies
Key Words: American motors, , v-8 , performance engine, rebuilt engine, rebuilding engine, balancing engine, rotating assembly, harmonic balancer, vibration damper, external balance , internal balance, match balancing, diesel engine balancing, ambassador, AMX, javelin, matador,

* Location: ARLINGTON
* it's NOT ok to contact this poster with services or other commercial interests
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Unread 07-27-2010, 05:24 AM   #21
TKFireman
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Thanks 82JeepCJ7, I'll definately shop around.
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Unread 07-27-2010, 06:43 AM   #22
Rebel6niner
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Unfortunatly these engines are internally balanced. You cannot simply replace the harmonic balancer, The engine will not run for PooPoo! ( I have driven one such, it ran like c-rap ). Hunt Bulltear, or the AMC forum, there are people who know how to balance these engines.
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Unread 07-27-2010, 06:52 AM   #23
timmayham
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I great tool I used when I rebuilt my 360 was the engine building video from www.boxwrench.com I highly recommend it. It breaks down every step in the rebuild process from removal of the engine to putting the thing back in when you are done. Easy video to use and very well done, well worth the $30.

As for price point. I agree with what has been mentioned before. I'd expect any where between $1000-$1800 depending on the amount of machine shop work needed and parts. Remember that if you have to bore, you are going to need pistons. If you buy a cam, you will need lifters and most likely valve springs at a minimum (depends on the cam. My Edlebrock Performer came with lifters and recommended Sure Seat valve springs). Of course things like freeze plugs, bearing sets, piston rings, timing chain, oil pump and pick up, gaskets, etc.all need to be considered. I thought I was going to lose my mind at one point, but it turned out to be alot easier than I thought it would.

Buy that DVD though... The most useful tool I had for the entire rebuild.
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Unread 07-27-2010, 06:54 AM   #24
timmayham
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oh and the AMC V-8s are externally ballanced and require a specific flywheel or flexplate depending on engine size
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Unread 07-27-2010, 06:56 AM   #25
82JeepCJ7
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All AMC V8s are external balance. The inline 6s are internal. That is why there are specific harmonic balancers and flywheels for each displacement. You cannot put a 360 flywheel on a 401, or vice versa.

I am sure the one you drove had other issues, but it could of had the wrong balancer and flywheel on it.
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Unread 07-27-2010, 07:01 AM   #26
Rebel6niner
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Quote:
Originally Posted by Rebel6niner View Post
Unfortunatly these engines are internally balanced. You cannot simply replace the harmonic balancer, The engine will not run for PooPoo! ( I have driven one such, it ran like c-rap ). Hunt Bulltear, or the AMC forum, there are people who know how to balance these engines.
Don't be discouraged though, these are worthy engines. In their stock configuration they weighed the same as an SBC, but put out more torque at a lower RPM. They are also long lived as the block and heads were made of nickle steel instead of cast iron.
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Unread 07-28-2010, 03:45 PM   #27
motiv8ya
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I came across this kit today while searching for my second 401 rebuild kit.....Item #330447694680 on ebay. Pretty inexpensive as far as 401 rebuild kits go...
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Unread 07-28-2010, 04:27 PM   #28
Hybrid Jeep
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Hey man.. definitely go with the Boxwrench DVD on engine rebuilding as mentioned. It is TOTALLY awesome. Also.. why not just bring everything to a machine shop and have them diagnose what is wrong with each part. They will write up a quote for the machining and they can even get a master rebuild kit for you. Usually they have an account with a rebuilt kit company and can get you a kit for less than what YOU would pay retail.

Take it to a good machine shop and have the guy run down what is wrong and what needs to be done. That is the way to do it! Good luck!
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Unread 07-28-2010, 04:48 PM   #29
TKFireman
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Thanks motiv8ya, looks pretty good, including the RV torque cam. I reckon I'll just have to wait and see what the machine shop says before I can purchase a kit, and got to do more research and save up some money.

new questions.

1. If replacing head bolts, rod bolts, and I'm assuming main cap bolts during a rebuild is highly recommended, how come they don't come with a rebuild kit, looks like another $200+ for those 3 sets of bolts.

2. Rocker arms - recommend staying stock, splurging for the roller rockers and all the parts that go with them? cheaper to stay with hydraulic lifters and stock rockers. Need new bolts for these too? What are the bridges for? Can I replace the one bridge I broke, or need to replace them all? Note for anyone doing this - if you rotate the engine to take the pressure off the rockers, your less likely to break the bridge when removing......live and learn


3. push rods look fine, but I assume replacing them with new hardened ones is recommended and not very expensive.

4. Anyone seen a high volume oil pump? I've read all the oil mod write-ups I could find, with mixed results. Seems like they may not be needed unless you want to turn a high rpm on a consistent basis. I'm still on the fence about doing any of these. Honestly, a lot of these AMC V8s are 25+ years old and still running with the stock oiling system.

5. Are the steps in this process disassemble, take engine to machine shop, see what they say, buy kit from that info, take kit to them to install cam bearings, freeze plugs, pistons on rods and balance the rotating assembly, bring everything home for assembly?
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Last edited by TKFireman; 07-28-2010 at 08:04 PM..
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Unread 07-28-2010, 04:58 PM   #30
TKFireman
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Quote:
Originally Posted by Hybrid Jeep View Post
Hey man.. definitely go with the Boxwrench DVD on engine rebuilding as mentioned. It is TOTALLY awesome. Also.. why not just bring everything to a machine shop and have them diagnose what is wrong with each part. They will write up a quote for the machining and they can even get a master rebuild kit for you. Usually they have an account with a rebuilt kit company and can get you a kit for less than what YOU would pay retail.

Take it to a good machine shop and have the guy run down what is wrong and what needs to be done. That is the way to do it! Good luck!

Thanks Hybrid Jeep, that answers some of my questions, and I'll definatley get the boxwrench DVD
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401 , bumper build , crankshaft , dana 300 , engine rebuild , harmonic balancer , heads , nv4500 , oil pan , pistons , rebuild , rock slider , shop build
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