Too good to be true? 4.0 head question - Defender Source
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  #1  
Old June 14th, 2016, 03:34 PM
Tyler Wirken
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Tyler Wirken
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Too good to be true? 4.0 head question

So I found out I have zero compression in cylinder #2 on my 1997 4.0 V8. The cylinder has been burning oil for years and recently had a misfire due to a fouled plug. Changed the plug and all was good. Now the other day on the highway it developed another misfire. Checked spark, all good there, and put in a new plug. Still nothing. Did a compression test last night and zero compression. 160psi on the cylinder next it but nada on #2.

So I am about to do a leak down test to see where the problem is but in the mean time I am searching for solutions. I am hopeful it is valves and not rings. If it is I will need to have the head rebuilt.

In searching ebay I found this link. Seems to good to be true for that price.

Any thoughts, experience or advice?

Land Rover Discovery 4 0 Cylinder Heads Complete Pair Cast HRC 2479 1995 1999 | eBay

Thanks
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  #2  
Old June 14th, 2016, 03:46 PM
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David Frank
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Pm'd
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  #3  
Old June 14th, 2016, 10:12 PM
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Probably a bent exhaust valve from valve sticking. Did you have a CEL? The very late valves are supposedly much better about not sticking, but they are rare and megabucks new (pretty sure I have a set somewhere) $200 a head is about what it costs for a deck and rebuild. If they are not warped, you can clean, ream, lap, and put one back together in an hour or two. Make sure you have a good valve compressor. The reamer is helpful but not necessary and can lead to additional issues like oil usage. If it were me, I would ream the valve guides. I forget the spec but it is very minimal like a few thousands or something.
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Old June 14th, 2016, 10:14 PM
Naplm00
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Matthew
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Quote:
Originally Posted by Tyler Wirken View Post
So I found out I have zero compression in cylinder #2 on my 1997 4.0 V8. The cylinder has been burning oil for years and recently had a misfire due to a fouled plug. Changed the plug and all was good. Now the other day on the highway it developed another misfire. Checked spark, all good there, and put in a new plug. Still nothing. Did a compression test last night and zero compression. 160psi on the cylinder next it but nada on #2.

So I am about to do a leak down test to see where the problem is but in the mean time I am searching for solutions. I am hopeful it is valves and not rings. If it is I will need to have the head rebuilt.

In searching ebay I found this link. Seems to good to be true for that price.

Any thoughts, experience or advice?

Land Rover Discovery 4 0 Cylinder Heads Complete Pair Cast HRC 2479 1995 1999 | eBay

Thanks

I got a set of 351w ford cobra heads reman for less, so I think it's probably legit
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  #5  
Old June 16th, 2016, 10:00 AM
Tyler Wirken
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Thanks for the insight. Not sure what you mean by a CEL. But I pulled the valve cover last night and nothing looks out of place so we shall see. Gonna do a leak down test today to just verify it's not rings and then will pull the head. Compression on all other cylinders is really good. All are at 170-175 so that is promising.

Not sure if I want to rebuild the head or buy re manufactured ones in the interest of time. Would be nice to just order them and slap new ones on.
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  #6  
Old June 16th, 2016, 10:05 AM
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Chris Davis
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CEL=Check Engine Light
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  #7  
Old June 16th, 2016, 10:11 AM
Tyler Wirken
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Ahh yes. My CEL is on all the time due to a bad rough road sensor computer issue. But I did have the codes read and it said misfire cylinder #2. So I would assume the CEL was triggered.
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  #8  
Old June 16th, 2016, 10:35 AM
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Bill Adams
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If it was rings you'd have huge smoke coming out the pipe.
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  #9  
Old June 16th, 2016, 11:15 AM
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If its rings, a squirt of oil in the cylinder will raise the compression signficantly on the compression test. If it's valves, it won't.
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  #10  
Old June 16th, 2016, 05:11 PM
Tyler Wirken
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Good point on the rings.

Did a leak down test today and it undoubtedly is an exhaust valve. So that is good.

I think I am gonna go for those rebuilt heads. I called them today and they seem totally legit.

Good price seeing as a local machine shop would charge about $250-$300 or so to rebuild the one head. Might as well do both while in there.

One more question for you all regarding a gasket kit. Atlantic British has one for like $119 but shows a ton of o-rings and other gaskets. I assume that is for totally rebuilding the top end. I am not doing that. So how many gaskets should I be replacing? Obviously head, valve cover, I need a new intake manifold gasket otherwise known as the valley pan gasket if I am not mistaken but other than that what else should I source?
Finally, what about head bolts? Do they need to be replaced as well?

Thanks for the help.
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  #11  
Old June 16th, 2016, 05:14 PM
Tyler Wirken
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Here is the photo of the gasket kit from AB.
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  #12  
Old June 16th, 2016, 05:28 PM
Tyler Wirken
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Found the answer to my head bolt question. They need to be replaced each time they are taken out.
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  #13  
Old June 16th, 2016, 05:52 PM
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Not sure if he still does it, but Will Tillery used to sell heads that had already been rebuilt for a pretty good price.
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  #14  
Old June 16th, 2016, 10:26 PM
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That is the kit you want. You won't use a few of them, but separately it would be more expensive. Buy genuine. The little round things are valve guide seals which the rebuilt head should already have.
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  #15  
Old June 16th, 2016, 11:27 PM
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dont forget that front cover gasket either this is a perfect time to have your radiator serviced
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  #16  
Old June 16th, 2016, 11:55 PM
Tyler Wirken
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Thanks for the help. I appreciate it.
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  #17  
Old June 17th, 2016, 07:30 AM
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Kevin Keith
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Quote:
Originally Posted by rover4x4 View Post
dont forget that front cover gasket either this is a perfect time to have your radiator serviced
Does the front cover have to come off?
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