4.7 Dropped Valve Seat - YEAR POLL - Page 7 - JeepForum.com
View Poll Results: What year was your dropped valve 4.7?
1999 8 11.59%
2000 10 14.49%
2001 8 11.59%
2002 19 27.54%
2003 3 4.35%
2004 22 31.88%
Multiple Choice Poll. Voters: 69. You may not vote on this poll

 24Likes
Reply
 
LinkBack Thread Tools
post #91 of 171 Old 11-28-2018, 05:55 PM
Rob 99TJ
Registered User
 
Rob 99TJ's Avatar
1983 CJ8 
 
Join Date: May 2005
Location: Allen Park
Posts: 591
Never had a problem with my 00' 4.7. I owned it from 2001 to 2013. I sold it with about 140K miles. Always maintained well. It was one of the best vehicles I've had.


83' CJ-8 w/ Golen 4.6, D30/AMC20,ARBs, AX-15, D300 w/4:1
07' WK Limited Hemi
Rob 99TJ is offline  
Sponsored Links
Advertisement
 
post #92 of 171 Old 11-29-2018, 01:55 PM
SD Overland
Member
 
SD Overland's Avatar
2004 WJ 
 
Join Date: Jul 2018
Location: San Diego
Posts: 220
Garage
I suppose I can add my experience and $0.02.

Bought a 2004 4.7 HO from a guy here in California at 99,950 miles. Noticed a slow coolant loss after a month and found out there was coolant in cylinder 1. I paid to have the head gaskets replaced and the machine shop said there was very little, to no warpage on the problem cylinder head. They also did a valve seat drop test on both cylinder heads and both passed with flying colors. Overall the thing was in great shape, I'm blaming the problem on a faulty head gasket.
SD Overland is offline  
post #93 of 171 Old 12-03-2018, 03:04 PM
TheBoogieman
Disturbed Jeepaholic
 
TheBoogieman's Avatar
2003 TJ Wrangler 
 
Join Date: Aug 2006
Location: charlottesHELL
Posts: 41,469
My 2000' blew up with 120,000 miles on it, about 3 months after I sold it.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
2003' Rubicon/Zone 4.25" combo lift with Rancho RS5000X shocks/ Zone hydro shocks/5.13 gears/35" Mickey Thompson MTZ P3 tires/Black Magic brakes. Jeep #17 & 19.
TheBoogieman is offline  
 
post #94 of 171 Old 12-06-2018, 01:34 PM
Mofugly13
Registered User
1999 WJ 
 
Join Date: Jun 2018
Location: San Francisco
Posts: 204
Do no if this helps. Had a Dodge Ram 1500, 2003, with the 4.7. Got it fro my FIL in Ď10 and it sounded like a diesel with what I assumed was lifter clatter. Last June I sold it Ďas isí barely running with the clatter very loud and noticeable with and throwing a misfire code. Sold it with full disclosure of all things wrong. Dude went over it for an hour including a test drive and gave me $400 for it. He called me back 3 days later saying it dropped a valve and didnít run and could he get some money back. Well, of course not, he knew what he was buying. Anyway, not until I read this thread did I see the dropped seat issue. Iím guessing that was what happened.


Sent from my iPad using Tapatalk
Mofugly13 is offline  
post #95 of 171 Old 02-28-2019, 11:34 AM
Jmaddox
Registered User
 
Jmaddox's Avatar
2002 WJ 
 
Join Date: Nov 2018
Posts: 11
2002 GC Overland, Dropped #2 cylinder yesterday. 129,000 miles DAMMITTT
Jmaddox is offline  
post #96 of 171 Old 02-28-2019, 12:43 PM
cDee63
Web Wheeler
 
cDee63's Avatar
2004 WJ 
 
Join Date: Mar 2018
Location: The Motor City
Posts: 1,570
Garage
04, 144,000 with a misfire on start up. Think it's more head gaskets then seat, however the PO overheated it at least once according to him. Set of heads with the seat problem addressed on the way today. Doing the timing chains and hardware also.

2004 Limited, 4.7 modded slightly, IRO 3" RockLink LA front, adjustable SA rear, Bilsteins, Addco bar, JKS disconnects. Coming attractions include 242hd, IRO SYE and Woods DS right after the new engine/trans..
1974 Ironhead Sportster, total custom
High speed, low drag
cDee63 is offline  
post #97 of 171 Old 04-02-2019, 05:47 AM
Dmwil
Registered User
2018  
 
Join Date: Aug 2007
Location: Indiana
Posts: 67
roughly how much does it cost to have a set of heads replaced with improved valve seats, should mine ever drop one or more? I've got 104k on it (2004, not an HO) and it runs great.
Dmwil is offline  
post #98 of 171 Old 09-19-2019, 07:34 AM
WICruiser
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: Chilton
Posts: 60
Garage
I just determined I have a dropped intake valve seat on my 2004 (not HO).

WICruiser
1992 Wrangler YJ Project (4 cyl, 5 speed man - going to SBC, 4 or 5 speed man)
1985 Porsche 928 Project
Chilton WI
WICruiser is offline  
post #99 of 171 Old 09-24-2019, 07:23 AM
DL44
Registered User
 
DL44's Avatar
 
Join Date: Jan 2018
Posts: 12
At 121k my engine seized under normal driving conditions. I was headed down a dirt road at about 10 mph. The valve seat had dropped in the piston closest to the firewall on the drivers side.


Sent from my iPhone using Tapatalk
DL44 is offline  
post #100 of 171 Old 10-21-2019, 01:07 PM
leadsled jeep
Registered User
 
leadsled jeep's Avatar
2002 WJ 
 
Join Date: Sep 2006
Location: TriCities
Posts: 1,924
222,195 miles on mine. I never let her overheat. Always use the best synthetic oil. No dropped valves. Typically get 900 miles per quart of oil. No plans for new engine yet.

Valve seat issues appear to me to be related to thermal expansion with different metals. Overheat and expansion will cause them to drop out. Keep temps happy and moving parts well liubricated so no local areas overheat and this should also help greatly.

For a WEAK and IGNORANT people, SERF-dom is a Reward, not a Curse. W1CCW
leadsled jeep is offline  
post #101 of 171 Old 11-03-2019, 10:29 AM
Jimmy2Ton
Registered User
2004 WJ 
 
Join Date: Nov 2019
Posts: 41
'03 GC Overland 4.7 H.O. @ about 155k - No issues


Didnt know this problem existed. I will certainly be taking preventitve measures. Not pusing her too 5.5k rpm anymore for a start
Jimmy2Ton is offline  
post #102 of 171 Old 11-14-2019, 01:03 PM
cruisingram
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2014
Location: Pahoa, Hawaii
Posts: 543
I just bought a super clean super cherry 01 WJ lifted, whole bit, for 500 bucks. They told me it had "problem with the heads"- I see on Ebay you can get a whole new head pretty cheap. What is the cost, minus labor of actually replacing head, and is there collateral damage here usually? If I have to drop 2k on a complete engine, still not a bad deal- but if I can just swap heads from reman heads off ebay- this vehicle is a steal. Oh, it's an 01 like I said, and I particiapted in the poll.
cruisingram is offline  
post #103 of 171 Old 11-15-2019, 08:51 AM
WICruiser
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: Chilton
Posts: 60
Garage
I bought a similarly challenged vehicle. I bought replacement cylinder heads for $600 but the piston on the "bad" cylinder was significantly impacted (but not cracked). I bought a rebuild kit that included all the bearing, gaskets, new pistons, piston rings, etc. for another $600 and rebuilt the engine.

Unfortunately my story is not complete as I do not have the engine back into the vehicle yet.

WICruiser
1992 Wrangler YJ Project (4 cyl, 5 speed man - going to SBC, 4 or 5 speed man)
1985 Porsche 928 Project
Chilton WI
WICruiser is offline  
post #104 of 171 Old 11-15-2019, 09:50 AM
Ylocuda
Registered User
 
Join Date: Apr 2018
Posts: 7
Quote:
Originally Posted by cruisingram View Post
I just bought a super clean super cherry 01 WJ lifted, whole bit, for 500 bucks. They told me it had "problem with the heads"- I see on Ebay you can get a whole new head pretty cheap. What is the cost, minus labor of actually replacing head, and is there collateral damage here usually? If I have to drop 2k on a complete engine, still not a bad deal- but if I can just swap heads from reman heads off ebay- this vehicle is a steal. Oh, it's an 01 like I said, and I particiapted in the poll.

I would inspect inside chamber with a boroscope through the spark plug hole to see condition of piston and bore. If all looks good just slip in a rebuilt head. Hopefully is the drivers side as that head requires less labor. Use a factory original head gasket making sure number stampings are facing up. Also mark chain position on sprocket and just rotate camshaft on new head to match wherever sprocket position is. My Jeep back on the road for about $400.
Ylocuda is offline  
post #105 of 171 Old 11-15-2019, 12:56 PM
cruisingram
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2014
Location: Pahoa, Hawaii
Posts: 543
Quote:
Originally Posted by Ylocuda View Post
I would inspect inside chamber with a boroscope through the spark plug hole to see condition of piston and bore. If all looks good just slip in a rebuilt head. Hopefully is the drivers side as that head requires less labor. Use a factory original head gasket making sure number stampings are facing up. Also mark chain position on sprocket and just rotate camshaft on new head to match wherever sprocket position is. My Jeep back on the road for about $400.
Thanks- perfect-= I was going to just pull the head and look, but the boroscope makes so much more since, duh! I am such a rural country hick sometimes LOL
cruisingram 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











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



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