Go Back   F150online Forums > Powertrain & Mechanical > V6 Engines (including Ecoboost)
Sign in using an external account
Register Forgot Password?


Welcome to F150Online Forums!
Welcome to F150Online.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the F150Online Forums community today!





Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-16-2010, 09:02 AM
Junior Member
 
Join Date: Jan 2010
Posts: 2
Question Tips on changing head gasket on 4.2L 97?

Got a F150 97 4.2L . Love the truck but noticed over the past month it started driving rough. Pulled the plugs the other day and bam, coolant in cylinder #4.

Constant misfires from cylinder #4 regardless of changed plugs and from what I've read this is due a bad gasket. If i'm lucky it's just the timing cover but if I'm going to do this I want to go the full length.

So anyone change the head gaskets on the 4.2L? If so any gotchas, tips of advice? I'm pretty mechanically inclined so if I take my time and follow the book I don't think I'll have much trouble.

I noticed it's a bit of a squeeze back towards the firewall. Don't need to drop the engine or anything to do this?

THanks!
J.
Reply With Quote
  #2  
Old 01-16-2010, 09:27 AM
Technical Article Contributor
 
Join Date: Jan 2007
Location: Vernon, NY
Vehicle: 2007 Ford F150
Posts: 5,744
It's not a head gasket, nor is it the valve cover gasket... it's an intake manifold gasket!

I'd suggest that you IMMEDIATLY stop driving the truck and get it towed to a shop ASAP. You don't want to spend $4000+ on a new engine do you?

The coolant leak that this engine is notorious for is from the intake manifold. This engine uses a twin intake port and the front and rear cylinders have coolant passages really close to one of the intake ports. The engine uses the plastic intake gasket with o'rings. When the gasket gives up, the coolant is sucked in with the air and hydrolocks the piston and rod combo which in turn bends the rod and when it gets short enough the counter weight of the crank starts hitting the bottom of the piston. The noise this makes at first can easily be mistaken for lifter noise. However after a short time the rod gets short enough that it is a solid knock. Under some circumstances the rod or the piston may break.
I'd suggest replacing the intake gaskets with the new improved ones from Ford only.
Reply With Quote
  #3  
Old 01-16-2010, 05:28 PM
Technical Article Contributor
 
Join Date: Jan 2007
Location: Live Oak, FL
Vehicle: 1998 Ford F-150
Posts: 10,490
Raptor05121 Raptor05121
Send a message via AIM to Raptor05121 Send a message via MSN to Raptor05121 Send a message via Yahoo to Raptor05121
felpro sucks

they owe me $4K
__________________
-Alex


4.2L V6 - M5OD ~415K miles | SCT XCal3 | K&N Series-77 | 16" Dual Efans | Magnaflow High-Flows
50W 5000K FX-R Projectors | Philips LumiLED Taillights | 60" Plasmaglow Fire & Ice | 2" Drop Shackles
Reply With Quote
  #4  
Old 01-16-2010, 06:46 PM
Senior Member
 
Join Date: Sep 2002
Location: USA
Posts: 2,360
Exclamation

Quote:
Originally Posted by ManualF150 View Post
It's not a head gasket, nor is it the valve cover gasket... it's an intake manifold gasket!

I'd suggest that you IMMEDIATLY stop driving the truck and get it towed to a shop ASAP. You don't want to spend $4000+ on a new engine do you?

The coolant leak that this engine is notorious for is from the intake manifold. This engine uses a twin intake port and the front and rear cylinders have coolant passages really close to one of the intake ports. The engine uses the plastic intake gasket with o'rings. When the gasket gives up, the coolant is sucked in with the air and hydrolocks the piston and rod combo which in turn bends the rod and when it gets short enough the counter weight of the crank starts hitting the bottom of the piston. The noise this makes at first can easily be mistaken for lifter noise. However after a short time the rod gets short enough that it is a solid knock. Under some circumstances the rod or the piston may break.
I'd suggest replacing the intake gaskets with the new improved ones from Ford only.
Everything he typed is 100% correct! I went thru this with my 97 F150!
__________________


2007 F150, 4.2 V6, 106K Miles
Reply With Quote
  #5  
Old 01-17-2010, 09:50 AM
Junior Member
 
Join Date: Jan 2010
Posts: 2
Quote:
Originally Posted by Raptor05121 View Post
felpro sucks

they owe me $4K
Buddy and I plan on doing this in a couple of weeks until it then it's parked. Question: What brand gasket kit has the group used and has anyone done this themselves? If so what was your experience, good/bad.. any gotchas that I should be careful about.
Reply With Quote
  #6  
Old 01-17-2010, 01:47 PM
Senior Member
 
Join Date: Sep 2002
Location: USA
Posts: 2,360
Exclamation

I helped a friend replace his about 2 years ago.Use the Ford updated gaskets.Its pretty much straight forward,no tricks.Ask the parts guy at Ford to give you the TSB sheet on the procedure and follow it to the letter!

BTW,if you are parking the truck until you do this job,DO NOT start the engine unless you pull the plugs and check for coolant in any of the cylinders!
__________________


2007 F150, 4.2 V6, 106K Miles
Reply With Quote
  #7  
Old 01-17-2010, 09:41 PM
Technical Article Contributor
 
Join Date: Jan 2007
Location: Vernon, NY
Vehicle: 2007 Ford F150
Posts: 5,744
Quote:
Originally Posted by jingo5 View Post
Buddy and I plan on doing this in a couple of weeks until it then it's parked. Question: What brand gasket kit has the group used and has anyone done this themselves?...snip...
Read my previous post again... and this time I will bold it...

Quote:
Originally Posted by ManualF150 View Post
It's not a head gasket, nor is it the valve cover gasket... it's an intake manifold gasket!

I'd suggest that you IMMEDIATLY stop driving the truck and get it towed to a shop ASAP. You don't want to spend $4000+ on a new engine do you?

The coolant leak that this engine is notorious for is from the intake manifold. This engine uses a twin intake port and the front and rear cylinders have coolant passages really close to one of the intake ports. The engine uses the plastic intake gasket with o'rings. When the gasket gives up, the coolant is sucked in with the air and hydrolocks the piston and rod combo which in turn bends the rod and when it gets short enough the counter weight of the crank starts hitting the bottom of the piston. The noise this makes at first can easily be mistaken for lifter noise. However after a short time the rod gets short enough that it is a solid knock. Under some circumstances the rod or the piston may break.
I'd suggest replacing the intake gaskets with the new improved ones from Ford only.
Reply With Quote
  #8  
Old 01-20-2010, 04:26 PM
Member
 
Join Date: Mar 2009
Location: Kansas City, Kansas
Vehicle: 2003 Ford F-150 2wd
Posts: 73
Intake Gaskit

Quote:
Originally Posted by ManualF150 View Post
Read my previous post again... and this time I will bold it...
I was reading the forum and was reading the part were the collent leaking into the cyl can be mistaken for lifter tick. There have been times that i hear what i say is a lifter tick and my 03 uses a little coolent. I will fill it to the cold fill line and it will go down but only an inch and it will stop right there. Until i add more and then it dose the same thing unless i leave it alone. Anyone think my intake gaskit is on the way out?
Reply With Quote
Old 01-20-2010, 04:26 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 On
Refbacks are Off


All times are GMT -4. The time now is 06:46 PM.


 
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details