2003 Discovery 4.6 engine block - Defender Source
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  #1  
Old July 13th, 2010, 07:21 PM
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Ryan Quandt
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2003 Discovery 4.6 engine block

I have a Discovery 2003 4.6 engine block installed in my D90. I recently found out that certain vin 2003's had a major flaw with the engine block not alligning with the oil pump, which caused the oil pump to fail and people needing a new engine. I also believe that I have one of these blocks installed on my defender.

One LR mechanic tells me that it is only a matter of time until it makes my oil pump fail and happening to me.

Another LR mechanic tells me that the Defender uses a different system to allign the oil pump and that this is not an issue for me.

Does anybody have more info or have heard of this issue?

Thanks
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  #2  
Old July 13th, 2010, 08:56 PM
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Scott
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Ryan,

Why not grab the VIN off the block and go to LR and find out if yours is in danger. If it is, plan for it and either fix the problem now, or save up some cash to address it later.

Post some pics of the motor.

Scott
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  #3  
Old July 13th, 2010, 11:47 PM
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On a 1997 it could be an issue. 94/95 used a different pump set up. Me, I would just run it.
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  #4  
Old July 14th, 2010, 02:59 AM
jack SF
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jack baran
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Usually the engines with bad pumps failed within a few thousand miles. If it has not failed yet than you should be ok. How many miles on the engine.
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  #5  
Old July 14th, 2010, 09:23 AM
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Ryan Quandt
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I just reached 4100 miles on it so far.
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  #6  
Old July 14th, 2010, 09:33 AM
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Quote:
Originally Posted by nomadic90 View Post
I
Another LR mechanic tells me that the Defender uses a different system to allign the oil pump and that this is not an issue for me.

A 97 90 drives the oil pump the same way a D2 does, so you'd need to know more about the issue. If it was an issue with the timing cover on the D2, then it won't bother your 90. If it was something about the crank in the motor then it might.
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  #7  
Old July 14th, 2010, 10:29 AM
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From what I understand, the problem was with the casting of the block and the dowels that align the front cover to the block. I've heard some people removing the dowels and just using the bolts...

The VIN range is all 2003 Discoverys ending with 3A771801 – 3A808362

Here's one thread on it;
http://www.landroversonly.com/forums...l-alert-23098/

I've heard of it happening to some 2004s as well. I pulled a 4.6 from a 2003 that falls in the affected vin range.. it has 106k miles on it, and no problems yet (knock on wood) ... i'm putting it into my 2001 d2
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  #8  
Old July 14th, 2010, 10:54 AM
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Ryan Quandt
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Yes, I believe the LR mechanic removed the dowels and just bolted it in. The Discovery this block came from is long gone so I can't get the vin # from it. If the dowels have been removed how long do you think this will last?
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  #9  
Old July 15th, 2010, 09:43 AM
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How many miles on the engine? Either way it sounds like you will be ok.
Is there a lot more power with the 4.6?
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