PT Cruiser problems! - Hemi Truck Club
 
Go Back   Hemi Truck Club > HemiTruckClub Community Forums > HemiTruckClub Drivers Lounge (Community Discussions)

Reply
 
Thread Tools Display Modes
 
Old 11-28-2011, 06:40 PM   #1
Senior Member
 
NashvilleHemi's Avatar
 
Join Date: Jul 2010
Location: Nashville, TN
Posts: 1,108
A friend of mine has a 09 PT Cruiser that the dealer says burnt a valve on #3 cylinder. Back in June i changed the oil for them to Amsoils Sig series and its been 10K miles since then so of course Chrysler is gonna blame the lack of oil changes bc its not the 3000 mile interval!!

Is a burnt valve a common problem on these cars if anyone knows??

__________________
04 QC SB, Dynomax cat-back, K&N 77 series CAI, Trick flow Underdrive Balencer, AFE TB spacer, MSD 8.5 wires, e3 plugs, Superchips 3865, 3rd Strike ported TB, Jet 180 T-stat


NashvilleHemi is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-28-2011, 06:40 PM   #2
Senior Member
 
NashvilleHemi's Avatar
 
Join Date: Jul 2010
Location: Nashville, TN
Posts: 1,108
A friend of mine has a 09 PT Cruiser that the dealer says burnt a valve on #3 cylinder. Back in June i changed the oil for them to Amsoils Sig series and its been 10K miles since then so of course Chrysler is gonna blame the lack of oil changes bc its not the 3000 mile interval!!

Is a burnt valve a common problem on these cars if anyone knows??
__________________
04 QC SB, Dynomax cat-back, K&N 77 series CAI, Trick flow Underdrive Balencer, AFE TB spacer, MSD 8.5 wires, e3 plugs, Superchips 3865, 3rd Strike ported TB, Jet 180 T-stat


NashvilleHemi is offline   Reply With Quote
Old 11-29-2011, 04:04 AM   #3
Senior Member
 
MikeHTally's Avatar
 
Join Date: Aug 2007
Location: Tallahassee, FL
Posts: 5,455
Garage
Not sure how a burned valve could be caused by oil changes (or lack thereof).
__________________
MikeHTally is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-29-2011, 06:27 AM   #4
Board of Directors
 
HemiByrd's Avatar
 
Join Date: Aug 2005
Location: Draffenville, KY
Posts: 25,097
Garage
10K isn't that bad as long as the oil level stays ok and no contaminants get in it.

I found this:
Quote:
My mechanic says my engine has a "burned valve." What does that mean?

A "burned valve" is a valve that has overheated and lost its ability to hold a leak-free seal. Valve burning is usually limited to exhaust valves because they run much hotter than intake valves.

The diagnosis of a burned valve is usually the result of a compression test. If a cylinder shows little or no compression, it frequently means the exhaust valve is not sealing. The valve may or may not be actually burnt (melted), but have other physical damage such as cracks or areas where pieces of metal are missing or eroded away from the valve face.

The cure for this condition is to remove the cylinder head, replace the bad valve and reface (or replace) the valve seat. As a rule, the head is usually given a complete valve job at the same time because the rest of the valves and guides probably need attention, too. If one exhaust valve has failed, the rest are probably on the verge of failure if they haven't already started to leak.

Why Valves Burn

There are several reasons why valves burn. One is normal wear. As an engine accumulates miles, the constant pounding and thermal erosion wears away the metal on the face of the valve and seat. The exhaust valve sheds most of its heat through the seat, so when the face and seat become worn and the area of contact is reduced, the valve starts to run hot. Eventually the buildup of heat weakens the metal and pieces of it start to break or flake away. Once this happens, it forms a hot spot that accelerates the process all the more. The valve begins to leak and compression drops. The result is a weak or dead cylinder and a noticeable drop in engine power, smoothness and performance.

A bad exhaust valve will also increase exhaust emissions significantly because it allows unburned fuel to leak into the exhaust. High hydrocarbon (HC) emissions, therefore, may also be an indicator of a burned valve.

An exhaust valve can also burn if the valve lash closes up for some reason (improper lash adjustment, cam or lifter wear, a bent push rod, worn rocker arm or cam follower, etc.). The lack of lash (clearance) in the valvetrain prevents the valve from closing fully, which causes it to leak compression and overheat.

Valve burning can also be caused by any condition that makes the engine run hot or elevates combustion temperatures. This includes cooling problems, abnormal combustion like detonation or preignition, loss of exhaust gas recirculation (EGR), retarded ignition timing or lean fuel mixtures.

Valve Recession

A condition known as "valve recession" can allow the valves to recede or sink into the head because of excessive seat wear. This causes the valve lash to be lost which allows the valves to leak and burn. It occurs primarily in older engines (mostly those built prior to 1975) that were not designed to run on unleaded gasoline. When leaded gasoline was still around, lead acted like a lubricant to reduce valve seat wear. But when lead was eliminated, it meant engines had to be made with harder seats. These older engines didn't have hard seats, so many began to experience valve wear problems when switched to unleaded fuel. If you're driving an antique or classic car, therefore, you should either use some type of lead substitute fuel additive to protect the valves or have the seats replaced with hard seats when the engine is overhauled.
http://autos.yahoo.com/maintai...ngine/ques053_1.html
__________________
'05 RCSB 1500 SLT 5.7 Hemi Ram - Airaid Long Snorkel UBI CAI - Taylor shorty wires - MSD Coil Packs Magnaflow y-pipe - Flowmaster 50HD - Superchips 3865 - Motive 4.56 gears - Detroit Truetrac - PML differential cover some good Karma 8.87 ET
HemiByrd is offline   Reply With Quote
Old 11-29-2011, 08:51 AM   #5
Senior Member
 
NashvilleHemi's Avatar
 
Join Date: Jul 2010
Location: Nashville, TN
Posts: 1,108
Thanks Dave!! So it has nothing to do with the type of oil or lack of oil changes?
__________________
04 QC SB, Dynomax cat-back, K&N 77 series CAI, Trick flow Underdrive Balencer, AFE TB spacer, MSD 8.5 wires, e3 plugs, Superchips 3865, 3rd Strike ported TB, Jet 180 T-stat


NashvilleHemi is offline   Reply With Quote
Old 11-29-2011, 10:03 AM   #6
Board of Directors (Jay)
 
Superjay's Avatar
 
Join Date: Jun 2004
Location: Isle of Palms, SC
Posts: 43,454
http://www.amsoil.com/magnuson_moss.aspx
__________________
2003, Std. SWB, SLT, 20", 4:56 gear, AFE CAI, Superchip, 6.1 cam, 6.1 heads, Manley springs, retainers, pushrods, Edelbrock Hedders, 195 T-Stat, 8.2 Taylor, AEM, Power Wire, ARC-1,Amsoil Everything, and more. Veni Vidi Vici

HTC.com Titan Killer Club

Member # 17



Superjay is offline   Reply With Quote
Old 11-29-2011, 12:16 PM   #7
tui
Senior Member
 
tui's Avatar
 
Join Date: Nov 2010
Location: New Zealand
Posts: 767
Garage
Is leaded gasoline for cars still available in the States?
When we changed to completely unleaded fuel 15 years ago, people with older cars which did not have hardened valve seats were burning out valves fast and keeping the mechanics busy. Most didnt use the fuel additives which were available to compensate for the lack of lead in the fuel.
tui is offline   Reply With Quote
Old 11-29-2011, 01:13 PM   #8
Board of Directors
 
HemiByrd's Avatar
 
Join Date: Aug 2005
Location: Draffenville, KY
Posts: 25,097
Garage
Quote:
Is leaded gasoline for cars still available in the States?
Nope, not for many years.
__________________
'05 RCSB 1500 SLT 5.7 Hemi Ram - Airaid Long Snorkel UBI CAI - Taylor shorty wires - MSD Coil Packs Magnaflow y-pipe - Flowmaster 50HD - Superchips 3865 - Motive 4.56 gears - Detroit Truetrac - PML differential cover some good Karma 8.87 ET
HemiByrd is offline   Reply With Quote
Old 11-30-2011, 05:36 AM   #9
Stu
 
Join Date: Oct 2009
Location: FL
Posts: 20,413
Garage
Is that a turbo PT Cruiser?
Ghost03hemi is offline   Reply With Quote
Old 11-30-2011, 06:01 AM   #10
Senior Member
 
NashvilleHemi's Avatar
 
Join Date: Jul 2010
Location: Nashville, TN
Posts: 1,108
No Turbo!
__________________
04 QC SB, Dynomax cat-back, K&N 77 series CAI, Trick flow Underdrive Balencer, AFE TB spacer, MSD 8.5 wires, e3 plugs, Superchips 3865, 3rd Strike ported TB, Jet 180 T-stat


NashvilleHemi is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off


» Premium Vendor Showcase
n2 Speed Edge InTune Edge OCPerformance Parts

All times are GMT -6. The time now is 05:20 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.