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  #1  
Old 11-04-2010, 07:28 AM
bran7690 bran7690 is offline
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Default Should I fix cylinder heads?

My truck has 271,000 miles on it and started missing and having rough idle. I took it to mechanic and he ran compression test which showed on side was running bad. Should I take heads off to get them fixed or what?
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  #2  
Old 11-04-2010, 07:33 AM
sgtsandman sgtsandman is offline
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Default Re: Should I fix cylinder heads?

It depends on what's wrong with it. If it's a crack, replace it. If it's a blown gasket, you can probably fix it.
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  #3  
Old 11-04-2010, 07:42 AM
bran7690 bran7690 is offline
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Default Re: Should I fix cylinder heads?

Are they hard to get to and would it be worth the money?
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Old 11-04-2010, 07:55 AM
brinker88 brinker88 is offline
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Default Re: Should I fix cylinder heads?

4.0L are one of the easiest engines I personally have ever worked on. There's plenty of room, and any chilton or haynes manual will guide you through the process step by step. If you need to replace the heads, get a set of aftermarket ones due to them being a little thicker and stronger in all the right spots.
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  #5  
Old 11-04-2010, 08:11 AM
bran7690 bran7690 is offline
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Default Re: Should I fix cylinder heads?

Sorry this is a 3.0. I have not listed it yet. Is it safe to buy a rebuilt head?
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  #6  
Old 11-04-2010, 08:14 AM
ranger024x4 ranger024x4 is offline
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Default Re: Should I fix cylinder heads?

how do you know its the head?

If he only did a compression test, you will know which cylinder has the issue but not really what it is. You need to do a leak-down test. I would hate to spend money on heads when it was really rings
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  #7  
Old 11-04-2010, 08:21 AM
bran7690 bran7690 is offline
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Default Re: Should I fix cylinder heads?

How much do leak down test usually cost?
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  #8  
Old 11-04-2010, 11:34 AM
EMB1230 EMB1230 is offline
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Default Re: Should I fix cylinder heads?

Quote:
Originally Posted by brinker88 View Post
4.0L are one of the easiest engines I personally have ever worked on. There's plenty of room, and any chilton or haynes manual will guide you through the process step by step.
Yeah but you have a pushrod 4.0. The OHC 4.0 is a little more complex.
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  #9  
Old 11-08-2010, 09:51 PM
JeremyMik84 JeremyMik84 is offline
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Default Re: Should I fix cylinder heads?

i agree with sgtsandman headgaskets are a breeze to replace on these trucks i have a 02 edge 3.0 and i changed mine out in no time, check which cylinders are showing no compression and check gaskets and sign of gauding on liners...good luck in your repairs
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  #10  
Old 11-24-2010, 12:44 AM
StrokerScamp StrokerScamp is offline
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Default Re: Should I fix cylinder heads?

Hi. I know I'm new here, but I'm a wrench turner since 1974 and I just got done replacing the heads on my 04 3.0. There's a factory TSB out about valve seat recession. Symptoms include rough idle, random misfire codes, low compression and power loss. Dover Cylinder Head in Atlanta sells the heads you need to correct the problem IF that's what you're experiencing. They sell both heads, head gasket set, and new head bolts SHIPPED in the lower 48 for $350.00. They install tungsten carbide exhaust seats in the heads. ...and no, I'm not affiliated with them in any way. I just saw their Ebay add, called them up and they really did me right. My truck now runs great with no more rough idle, no more check engine light and restored power.

Here is a link to the TSB in question. I hope it's ok to post this.

http://ww2.justanswer.com/uploads/BO...ssfire_tsb.pdf
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  #11  
Old 11-26-2010, 08:35 PM
Lonncarr Lonncarr is offline
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Default Re: Should I fix cylinder heads?

Just a warning...With that many miles, if you put a new or remann head on it you will probily jeopardise the piston rings. When the combustion chamber regains it's compression the pressure will go to the point of least resistance. Been there, done that. Save yourself a stroke and alot of work, rebuild the engine.
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  #12  
Old 12-02-2010, 01:04 PM
cheeks04ranger cheeks04ranger is offline
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Default Re: Should I fix cylinder heads?

Quote:
Originally Posted by StrokerScamp View Post
Hi. I know I'm new here, but I'm a wrench turner since 1974 and I just got done replacing the heads on my 04 3.0. There's a factory TSB out about valve seat recession. Symptoms include rough idle, random misfire codes, low compression and power loss. Dover Cylinder Head in Atlanta sells the heads you need to correct the problem IF that's what you're experiencing. They sell both heads, head gasket set, and new head bolts SHIPPED in the lower 48 for $350.00. They install tungsten carbide exhaust seats in the heads. ...and no, I'm not affiliated with them in any way. I just saw their Ebay add, called them up and they really did me right. My truck now runs great with no more rough idle, no more check engine light and restored power.

Here is a link to the TSB in question. I hope it's ok to post this.

http://ww2.justanswer.com/uploads/BO...ssfire_tsb.pdf
I have this same problem. Did your fix require new heads or just gaskets. I just found the service bulletin lastnight and it made perfect sense and matched all my CEL codes ive had for the past year.
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Quote:
Originally Posted by machine090767 View Post
If the manufacturer calls it an OHV, then so will I.
you can call it a vibrator for all I care.
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  #13  
Old 12-02-2010, 01:31 PM
StrokerScamp StrokerScamp is offline
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Default Re: Should I fix cylinder heads?

I replaced the heads. I don't really see where the gaskets could have the same effect. The way the TSB reads, it is either in the secondary ignition or the heads. If you run a compression test and leakdown test and it fails, it's the heads. Honestly, when I got mine off, I though, "crap, this ain't what it is"......because I really could not tell much of a difference in the valves sitting in the chambers compared to the reman heads......and I've DONE machine work for a LONG time, so I know what I'm lookin at and still couldn't tell much difference. But I tell you what, the thing runs 100% better with NO CEL.

Oh, and if you've had the problem a long time, the ultimate outcome WILL BE that the engine will drop a valve. That would SUCK.

Last edited by StrokerScamp; 12-02-2010 at 01:34 PM.
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  #14  
Old 12-02-2010, 02:15 PM
StrokerScamp StrokerScamp is offline
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Default Re: Should I fix cylinder heads?

Remember too, there's a TON of truth to what Lonncarr said. Mine has 123,000 on it, but it still had cross hatch in the cylinders, and was using no oil. It's very important to pay attention to the condition of the engine.
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  #15  
Old 12-02-2010, 05:30 PM
cheeks04ranger cheeks04ranger is offline
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Default Re: Should I fix cylinder heads?

Quote:
Originally Posted by StrokerScamp View Post
I replaced the heads. I don't really see where the gaskets could have the same effect. The way the TSB reads, it is either in the secondary ignition or the heads. If you run a compression test and leakdown test and it fails, it's the heads. Honestly, when I got mine off, I though, "crap, this ain't what it is"......because I really could not tell much of a difference in the valves sitting in the chambers compared to the reman heads......and I've DONE machine work for a LONG time, so I know what I'm lookin at and still couldn't tell much difference. But I tell you what, the thing runs 100% better with NO CEL.

Oh, and if you've had the problem a long time, the ultimate outcome WILL BE that the engine will drop a valve. That would SUCK.
I am planning on having the compression test done. I have already looked at the heads that DOVER offers on ebay. If it fails which i am almost positive it will I plan on ordering the head, gasket, and bolt kit which dover offers for 350 i figure i could get the kit fairly quick since atlanta which i believe is where dover is located, is only a 2.5 hour drive from my house. Ill let you guys know what happens with it.
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Quote:
Originally Posted by machine090767 View Post
If the manufacturer calls it an OHV, then so will I.
you can call it a vibrator for all I care.
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