5.2l Grand Cherokee Engine Rebuild - Page 3 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #31 of 40 Old 07-22-2012, 08:45 PM Thread Starter
bmlarson12
Registered User
1997 ZJ 
 
Join Date: Apr 2012
Location: fort collins
Posts: 29
Should the engine computer learn this new camshaft over time? It really doesn't feel like there is more power at this point. I know I have noticed an improvement over the first few minutes of driving, but I am not sure how much the engine computer will adjust. Is there a slightly less expensive way to tune it than buying a tuner?

bmlarson12 is offline  
Sponsored Links
Advertisement
 
post #32 of 40 Old 07-24-2012, 02:00 PM Thread Starter
bmlarson12
Registered User
1997 ZJ 
 
Join Date: Apr 2012
Location: fort collins
Posts: 29
I messed with a few sensors in the throttle body and it is a little better.
bmlarson12 is offline  
post #33 of 40 Old 07-25-2012, 12:01 AM Thread Starter
bmlarson12
Registered User
1997 ZJ 
 
Join Date: Apr 2012
Location: fort collins
Posts: 29
There are a few things that I hadn't mentioned about the rebuild.
1. The pistons were reused because when they were measured with a micrometer, there was no wear at all.
2. Crankshaft had no wear at all.
3. The heads were not cracked, but the valves were not seating very well, so that was fixed.
4. There was no plenum leak, so the plenum cover was reused with a new gasket.
5. There was a misunderstanding about getting the lifters, so the old ones were reused. (we were running out of time to finish and didn't want to spend $480 on new lifters from a dealer)

The crosshatch pattern in the cylinders could easily be seen still, so it was just deglazed for new piston rings. I still want to find some way of modifying the engine computer that is not so expensive, but it is running well for now.
bmlarson12 is offline  
post #34 of 40 Old 08-04-2012, 04:37 PM
titus95
Registered User
 
titus95's Avatar
2001 TJ Wrangler 
 
Join Date: Jan 2003
Location: Lincoln
Posts: 217
Up to this point could you say what the total cost of the rebuild has been? Looking to do mine in the future, appreciate the info.

2001 TJ Sport
2008 JKU (Wife)
titus95 is offline  
post #35 of 40 Old 08-04-2012, 04:47 PM
Kevinyj95
Registered User
1995 ZJ 
 
Join Date: Jun 2012
Location: Presque Isle
Posts: 756
Why didnt you just buy a complete master rebuild kit? 529$ free shipping. comes with everything cam lifters pistons everything. heres a list...
FULL GASKET SET
Notes: W/ Valve Stem Seals & Rear Main Seal

(8)FLAT-TOP PISTONS
Sizes Available: STD, .020, 030, .040, .060

Notes: Flat Top Pistons w/ 1.741" CH.

PREMIUM PISTON RINGS
Sizes Available: STD, .020, 030, .040, .060

Notes: 5/64", 5/64", 3/16"

MAIN BEARINGS
Sizes Available: STD, .010, .020, .030

ROD BEARINGS
Sizes Available: STD, .010, .020, .030

CAMSHAFT BEARINGS
3-PC TIMING SET
OIL PUMP
FREEZE PLUGS
ROLLER CAMSHAFT
(16)ROLLER LIFTERS


Im sure theres more that was just the first one I found.
Kevinyj95 is offline  
post #36 of 40 Old 08-04-2012, 04:52 PM
Kevinyj95
Registered User
1995 ZJ 
 
Join Date: Jun 2012
Location: Presque Isle
Posts: 756
Its pretty cheap to rebuild a motor. Most people think its too complicated but its really not that bad. Now transmissions.......
Kevinyj95 is offline  
post #37 of 40 Old 08-04-2012, 05:04 PM
edpmedic
Registered User
1995 ZJ 
 
Join Date: Nov 2011
Location: Baldwin
Posts: 1,049
I agree about the kit that's usually the way j go. In my years of doing engines if I am using a new cam I do lifters. Old lifters can fail and wear a new camshaft. They were worn in on the old cam and cause the bottoms to wear in a different pattern and wear faster. They can also cause premature cam lobe wear.Depending on how aggressive you are with the lift and duration. I see no problem using the old pistons if they were in specs and not causing your knock problem.

Never4get those who gave their lives on 09-11-01 WTC and Pentagon. FDNY-EMS-NYPD-PAPD. Also those who are still dying.
_______________________________________________
"Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed."
Martin Luther King, Jr.
_______________________________________________
"Always aim at complete harmony of thought and word and deed. Always aim at purifying your thoughts and everything will be well."
Mahatma Gandhi
_______________________________________________
Feel the Sunshine on your face
edpmedic is offline  
post #38 of 40 Old 08-04-2012, 05:20 PM
edpmedic
Registered User
1995 ZJ 
 
Join Date: Nov 2011
Location: Baldwin
Posts: 1,049
Quote:
Originally Posted by Kevinyj95 View Post
Its pretty cheap to rebuild a motor. Most people think its too complicated but its really not that bad. Now transmissions.......
To me transmissions are easier. Less measuring and machine work. You get a master rebuild kit and its is just seals, clutch packs, and thrust washers. Just remember where it all goes and you can rebuild most Trans in 45 min. Including air check and valve body.

I'm not trying to be wise but if you do it a couple of times you realize they are almost all the same. Actually I find Chrysler Trans the easiest out of all of them. When I worked for GM I would try to get Trans jobs. When I worked for Fiat 124 Spyders head gaskets and timing belts were my bread and butter.

Never4get those who gave their lives on 09-11-01 WTC and Pentagon. FDNY-EMS-NYPD-PAPD. Also those who are still dying.
_______________________________________________
"Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed."
Martin Luther King, Jr.
_______________________________________________
"Always aim at complete harmony of thought and word and deed. Always aim at purifying your thoughts and everything will be well."
Mahatma Gandhi
_______________________________________________
Feel the Sunshine on your face
edpmedic is offline  
post #39 of 40 Old 08-04-2012, 05:23 PM
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint
Posts: 2,154
Quote:
Originally Posted by edpmedic
I agree about the kit that's usually the way j go. In my years of doing engines if I am using a new cam I do lifters. Old lifters can fail and wear a new camshaft. They were worn in on the old cam and cause the bottoms to wear in a different pattern and wear faster. They can also cause premature cam lobe wear.Depending on how aggressive you are with the lift and duration. I see no problem using the old pistons if they were in specs and not causing your knock problem.
Yeah new lifters and what did you do for springs?

3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline  
post #40 of 40 Old 03-24-2015, 11:40 AM
marciomagnumv8
Registered User
 
Join Date: Mar 2015
Location: Brasilia
Posts: 1
Does anybody knows if I could use these KB pistons http://www.summitracing.com/int/part...iew/make/dodge my 5.2 with no problems? Could I use pistons until 040 size in a magnum block? What´s benefits to use a 5.9 magnum camshaft in a magnum 5.2? Magnum engine with 10,5 compression needs to reprogram ECU and another modifications as spark plugs (cooler) head gaskets and another thermostat? Tks
marciomagnumv8 is offline  
Reply

Tags
5.2l , engine rebuild , magnum , performance

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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Check Engine Light On: 1995 Jeep Grand Cherokee Limited 4x4 4.0 Engine Keith1975 ZJ Grand Cherokee Forum 7 11-04-2014 09:31 PM
97 Jeep Grand Cherokee 5.2l rebuild help bmlarson12 ZJ Grand Cherokee Forum 16 04-19-2013 04:29 PM
Oil engine Castrol Edge is ok for Jeep Grand Cherokee WJ engine 3.1 VM Motori ? diogene ZJ Grand Cherokee Forum 0 11-11-2008 02:51 AM
Rebuild on an 02 Grand Cherokee mjbirner ZJ Grand Cherokee Forum 0 07-30-2008 09:26 AM
93 Grand Cherokee engine Black_cirrus ZJ Grand Cherokee Forum 2 01-02-2005 02:22 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome