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1995-2002 Range Rover P38A
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Discussion Starter #1
Stupid question for today. Sorry, but whats this bore flanked by threaded holes for in my GEMS 4.0 lower block sump face? It appears it may be a sump return from the oil bypass/relief valves. It looks like somthing should be mounted there? My lower end rebuild kit even has a flange gasket thats correctly sized to fit. Nothing in my photos (scant records) or in the shop manual reference drawings.
Wisdom? Please?
Sincere thanks.
 

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is that where the dipstick tube comes into the oil pan?
 

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1995-2002 Range Rover Classic
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1,413 Posts
it is the oil pick up for the non bosh set up, for some reason when using front cover pick up you can leave this open and engine still builds and maintain oil pressure.
when using other timing covers with out front pick up, you install the oil pick up screen there.
 

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1995-2002 Range Rover P38A
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Discussion Starter #4
Dipstick tube is cast into opposite side. Looks like its indeed the old pickup tube attachment point for earlier engines. Looking closely at my dismantling pics it appears this bore is now plugged at the front of the engine. The new style p/u tube attaches directly into the front cover.
 

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1995-2002 Range Rover P38A
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Discussion Starter #5
BTW, thank you. Nothing like putting a year or so between dismantling and reassembly with a few months of all the parts being left at a machine shop for top hatting and lower end rebuild. Fortunatey I bagged and tagged most all of the small bits. ?
 

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1995-2002 Range Rover Classic
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With the older engines, 3.5/3.9 liters, there is where the oil pick up is bolted on
may I add, if you use this block with 3.5, 3.9., 4.2 ancillaries to convert your truck to a 4.0/4.6, you use the 3.5 to 4.2 timing cover thus the use of said bore. that in it self is a totally different post.
 

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1995-2002 Range Rover P38A
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may I add, if you use this block with 3.5, 3.9., 4.2 ancillaries to convert your truck to a 4.0/4.6, you use the 3.5 to 4.2 timing cover thus the use of said bore. that in it self is a totally different post.
I have put a 4.6 in my Discovery 1, sump, cam shaft, intake manifold, flywheel and timing cover from the 3.9 needed to go on the 4.6 to make it work.
Too bad that the 3.9 camshaft gives less performance as the 4.6. But the 4.6 has now a very good throttle response below 3000rpm, out of breath at about 3500rpm
 

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1995-2002 Range Rover P38A
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I have put a 4.6 in my Discovery 1, sump, cam shaft, intake manifold, flywheel and timing cover from the 3.9 needed to go on the 4.6 to make it work.
Too bad that the 3.9 camshaft gives less performance as the 4.6. But the 4.6 has now a very good throttle response below 3000rpm, out of breath at about 3500rpm[/QUOTE

was It intentional putting the 3.9 cam, or a mistake not realizing you’d lose top end umphh.
I’ve owned 3.5, 3.9, classics, 2.5 & 4.6 p38s and we all know the difference between a 3.5 and a 4.6,
Id be pulling the front cover and getting a 4.6 cam in.
 

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1995-2002 Range Rover P38A
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I have put a 4.6 in my Discovery 1, sump, cam shaft, intake manifold, flywheel and timing cover from the 3.9 needed to go on the 4.6 to make it work.
Too bad that the 3.9 camshaft gives less performance as the 4.6. But the 4.6 has now a very good throttle response below 3000rpm, out of breath at about 3500rpm[/QUOTE

was It intentional putting the 3.9 cam, or a mistake not realizing you’d lose top end umphh.
I’ve owned 3.5, 3.9, classics, 2.5 & 4.6 p38s and we all know the difference between a 3.5 and a 4.6,
Id be pulling the front cover and getting a 4.6 cam in.
3.9 has a different ignition, driven by the cam, so it was a necessity
 

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1995-2002 Range Rover Classic
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1,413 Posts
I have put a 4.6 in my Discovery 1, sump, cam shaft, intake manifold, flywheel and timing cover from the 3.9 needed to go on the 4.6 to make it work.
Too bad that the 3.9 camshaft gives less performance as the 4.6. But the 4.6 has now a very good throttle response below 3000rpm, out of breath at about 3500rpm[/QUOTE

was It intentional putting the 3.9 cam, or a mistake not realizing you’d lose top end umphh.
I’ve owned 3.5, 3.9, classics, 2.5 & 4.6 p38s and we all know the difference between a 3.5 and a 4.6,
Id be pulling the front cover and getting a 4.6 cam in.
you are in the uk, thus you can get a performance cam retrofitted for the early distributor ignition but matching the 4.6 performance, contact RPI-engineering.

your 4.6 retrofit comes alive in ways you have never felt it, basically due to power to weight ratio and end gear.
 

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1995-2002 Range Rover P38A
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you are in the uk, thus you can get a performance cam retrofitted for the early distributor ignition but matching the 4.6 performance, contact RPI-engineering.

your 4.6 retrofit comes alive in ways you have never felt it, basically due to power to weight ratio and end gear.
Someone didn't pay attention at school.. ;) Tasmania is about 17000kms away from the UK ;)

I've got a 4.6 in my P38, but with a Kent180 cam. I actually like the 4.6 in my Disco, it has a very good throttle response and it's a strong engine, it's just out of breath at 3500rpm.

I regret I put a Kent 180 cam in my P38.
 
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