3.9L with blown head gasket F/S - Defender Source
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  #1  
Old June 28th, 2010, 09:13 PM
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jaherring
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Jason Herring
94 D90 ST #1253
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Location: San Pedro, CA, USA
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3.9L with blown head gasket F/S

When my 3.9L blew the passenger-side head gasket I decided to convert to diesel. I wanted a diesel anyway and I'm not putting another dime into the gas hog motor.

About the motor:

- ~ 10K miles on a rebuild
-new cam, lifters, fuel injectors, rebuild heads (one is good, one w/ blown gasket - who knows. I looked for visible cracks but it appears to just be coming from the head gasket - see photos).
-stupid expensive nearly new bosch platinum quad plugs
-new cap and plug wires
-new TPS
-ran and idled smooth until the gasket blew
-the guy who rebuilt it used metal gaskets - possibly the reason it blew?
-including power steering pump and A/C compressor/bracket, all pulleys, air flow sensor
-exhaust manifolds included

I will consider separating it for parts. Maybe all it needs is a fresh set of composite gaskets, or maybe the head is messed up and it needs more internal work. I drove it to the place where I pulled it out and dropped in the diesel. Oil pressure was normal and there's no knock or rough noise aside from the misfiring due to loss of compression through the head gasket.

Make an offer if interested. Will not include the alternator or starter.
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  #2  
Old June 29th, 2010, 04:12 PM
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Luis A. Costa
'93 Range Rover County LWB
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That might be why you blew the head gasket on a rebuild... when you used those plugs, they get the heads to hot..... you got to go with copper dude!
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  #3  
Old June 29th, 2010, 06:20 PM
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Verticalscrote
Volkswagen Super Beetle
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I have never seen one truly run/idle well with those plugs even.
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  #4  
Old July 19th, 2010, 03:47 AM
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jaherring
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Jason Herring
94 D90 ST #1253
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Join Date: May 2004
Location: San Pedro, CA, USA
Posts: 582
Well, I don't know about the plugs... the motor ran very smooth until the blow gasket. I think the problem was that the guy who rebuilt it used the tin head gaskets and not the composite... but at this point I'm not worried anymore, my 300TDI is installed...
Anyway, it was running great right until it wasn't. Now that I'm converting to diesel this is just taking up space. Anyone want some good parts? At least one good head, injectors, etc. Heck the injectors cost me $400. I'll take $300 to get it out of my way.
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  #5  
Old July 21st, 2010, 09:49 AM
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Trevor K
94 d90 #1304
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