Engine rebuild tips - JeepForum.com
 
LinkBack Thread Tools
post #1 of 4 Old 06-09-2007, 10:12 PM Thread Starter
hdfxrs91
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2006
Location: FL
Posts: 689
Engine rebuild tips

Hi all...
I'm rebuilding my '87 4.2 and would love to read about some of the tips you experienced people have. I already have the block, head, manifolds, pistons, crankshaft, etc. back from the machine shop and ready to assemble. The reason for the rebuild started as a leaking rear main and a oil pan that refused to come off. I'm glad I decided to rebuild as I found 2 cracked pistons, worn timing gears, and peeling cam bearings. I'm not new to rebuilding engines... it's just been awhile and I know that there could be some new things I can learn.

One question I have... the Haynes manual says to put the crank in first. Unfortunately that doesn't leave a lot of room for installing the cam. Can I install the cam first?

Anyway, any tips you guys have would be appreciated. I've been down for 6 months due to a job loss and would really like to get this thing back together.

TIA

hdfxrs91 is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 06-10-2007, 01:03 PM
Ares
Registered User
 
Ares's Avatar
1988 YJ Wrangler 
 
Join Date: Jun 2006
Location: Ellensburg/Redmond, WA
Posts: 1,363
You should be able to install the cam first. Every rebuild i've done I have always put the cam in first reguardless.

I would say a good tip is to keep each valve/lifter/spring/retaining clip/rocker arm together from where they came off. So, the intake set of those on cylinder one would stay together, the exhaust set on cylinder two would stay together, etc if you'r not replacing any of those since they have a specific wear pattern. But since its already disassembled, oh well. And you should at least be replacing the springs anyway .

Tip two would be if you can do a 3-angle valve job and re-grind the valve seats. If you dont have the tools/knowhow, see if you can find someone to do it. The valve job alone will make a noticable difference in the engine and where its not life or death important, it sure helps. Gives the valves a much better seal.

Aside from that...go slow, don't brake anything, don't cut corners, and be sure you put the piston rings in right!
Ares is offline  
post #3 of 4 Old 06-10-2007, 02:46 PM Thread Starter
hdfxrs91
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2006
Location: FL
Posts: 689
Thanks for the reply. I had a machine shop do the head/valves for me, as well as hone the block, put the con rods on the new pistons, polish the crank... all the things a good machine shop does. As for the rockers, I can see the wear marks that differentiate the intake set form the exhaust set, so I'll be able to match those up.
hdfxrs91 is offline  
post #4 of 4 Old 06-10-2007, 03:30 PM
4.7stroker
Registered User
1988 YJ Wrangler 
 
Join Date: Apr 2007
Location: Rio Rancho NM
Posts: 4,298
Rockers and pushrods are cheap, I replaced those also when I built my stroker.
Read the links provided about premature cam wear, some people have had their cam die in as little as 3000 miles.

Dwayne
4.7stroker is offline  
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.



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
Jeep Engine to Rebuild or Not to Rebuild booyia TJ Wrangler Technical Forum 31 10-02-2009 12:16 PM
tips for 2.5 rebuild gmorava YJ Wrangler Technical Forum 3 07-15-2009 01:23 PM
Engine / Engine Bay Rebuild Writeup Nexron YJ Wrangler Technical Forum 0 05-12-2009 10:54 PM
Engine Rebuild vs. Used Engine Swap rain-gler YJ Wrangler Technical Forum 34 03-12-2009 09:01 AM
York rebuild tips (and I found the noise!) BNovak TJ Wrangler Technical Forum 2 11-04-2004 07:51 AM

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