What did you do with your Range Rover today

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martynv8 said:
Yep, it was running beautifully for 10k, then misfire on 3&5, it always blows between the middle cylinders. I was hoping the top hats would give better protection around the fire rings:(:(:(
Click to expand...
Between 3 and 5 ?

the middle two on the right bank ? i would hazard that the head hasnt been machined properly or theres something on the block that is causing the failure there. is it possible that a top hat is mis seated and causing the HGF?
 
ukadamwest said:
Between 3 and 5 ?

the middle two on the right bank ? i would hazard that the head hasnt been machined properly or theres something on the block that is causing the failure there. is it possible that a top hat is mis seated and causing the HGF?
Click to expand...
Yes Adam, middle 2 on right bank.
These were the first to go a couple of years back. The heads were from Emmotts & checked before fitting on the new engine - maybe something was missed. Will see what the block shows next week.
 
All the bolt placements on the head bolts make a 4 square around the cylinder.. the only weak point is on 7 and 8 where the water channel runs close to the cylinder..

for 3 and 5 to keep going suggests there is something going on the mating of the surfaces.. as a second guess maybe there is some debris in the bolt threads preventing the torque down to be correct, and allowing the head to distort slightly.. but that is a just a hipshoot guess.. first guess i would say that something is going on there with the block or head face.. there's no way you should have had 3 HGF at all, let one in the same position.. if the block and head face checks out maybe there is some movement on the top hat causing gasket damage. have you seen the gaskets when removed ?
 
ukadamwest said:
All the bolt placements on the head bolts make a 4 square around the cylinder.. the only weak point is on 7 and 8 where the water channel runs close to the cylinder..

for 3 and 5 to keep going suggests there is something going on the mating of the surfaces.. as a second guess maybe there is some debris in the bolt threads preventing the torque down to be correct, and allowing the head to distort slightly.. but that is a just a hipshoot guess.. first guess i would say that something is going on there with the block or head face.. there's no way you should have had 3 HGF at all, let one in the same position.. if the block and head face checks out maybe there is some movement on the top hat causing gasket damage. have you seen the gaskets when removed ?
Click to expand...
Hi Adam,
Just to clarify, the previous HG failures were on the old engine (block) & old heads. 1st was blow between middle cylinders on right bank, then middle cylinders on left bank. This failure is with new block & new heads. Maybe weak fueling on 3 or 5 causing it to overheat on that cylinder? It's the only cause i can think of that would carry over to the new engine.
 
maybe the inlet manifold was distorted from the previous HGF and is allowing air to be sucked in causing that area to burn lean and generate too much heat ?
 
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