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Sand fan!!
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39 Posts
Discussion Starter #1
Hi, after I was having low compression in cylinders 8 & 6 I went for full engine rebuild... new: Rings, bearings, lifters, Sparks&wires, oil pump and high lift camshaft 53231.

I have the following issues since the first start till now ( ~ 1500 km):

- rough idle... The exhaust sounds crazy.
- oil turn to dark black very fast.
- high oil evaporation from pcv.
- multiple missfire on diagnostic.
- very high fuel consumption 30L/100km.

I have done a compression test for all cylinders and it was 150 psi +/- 5psi.

I've test the intake manifold for any leak by spilling some water.

Recently the back crank seal start to leak oil while I cancel the pcv and had an oil catch can.

I've tried to make the spark plugs with narrow Gap but no effect.

What you think I should do??
 

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Sand fan!!
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39 Posts
Discussion Starter #5
2004 Discovery 4.6 NAS
Who did the rebuild for you?

Just to make sure we understand fully, are you saying the truck was running fine, aside from the low compression in 6 & 8, prior to the rebuild and now it's doing all of the above?
The rebuild was done in-house with help of experience mechanical engineer. The rebuild kit from victor*REINZ expect one ring from britpart as we break it. Connection bearing was replaced. But other crank bearing was not changed since we didn't remove the block from*the car ... No honing ... Old pistons used.

No smoke comes from the exhaust so far ... I feel some pressure from crank ventilation over the valves cover
 

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Rover-Holic and Admin
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7,895 Posts
He wasn't that experienced.

There are so many things that could have gone wrong with your "rebuild" that I don't really know what advice to give. Good Luck
 

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Premium Member
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340 Posts
The rebuild was done in-house with help of experience mechanical engineer. The rebuild kit from victor*REINZ expect one ring from britpart as we break it. Connection bearing was replaced. But other crank bearing was not changed since we didn't remove the block from*the car ... No honing ... Old pistons used.
I'm with ArmyRover on this one - there are so many things that could have gone wrong on your rebuild and if it was not acting like this beforehand, process of elimination says the rebuild either was done incorrectly OR reassembly was performed incorrectly. It sounds to me like you need to start tearing it apart from the top down to try and figure out where your problem is.

Sorry
 

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Super Moderator
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2,148 Posts
Seems to me it is inaccurate to call what was done a “rebuild”
Not even out of the truck??? I guess that’s why the mains were not done. It may have had some repairs but surely this cannot be considered a rebuild.
Back to square 1 on this one I’m afraid.
 

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Sand fan!!
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39 Posts
Discussion Starter #10
Okay guys ... Guide me to the inspection steps. I would like to check if the cam alignment if it is correct. I'm planning to remove the valves cover and check if the cylinder no.1 valves are fully closed at TDC . Will but a screwdriver into plug hole to know if its at TDC. What you think?

Any other suggestions?
 

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Rover-Holic and Admin
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7,895 Posts
My guess, due to the lack of honing the rings haven't seated properly. With the rings not working as planned you get blow bye. Blow bye will cause nasty looking oil, oil consumption and excessive crankcase pressure.
 

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Sand fan!!
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39 Posts
Discussion Starter #12
Update ...

There is small carnk case pressure.

I've visited two specialist:

The first one said it's due to slight miss alignment of the camshaft. But I can't see any indication of that.

Second one said it's due to wrong installation of ring with two cases .. a) flipped top ring, b) broken ring during the fitting.


What you think?
 

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Super Moderator
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2,148 Posts
If it’s not apart it’s all just speculation.
 
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