Henry_b
Think outside, no box required.
Yes I agree with you
But the bad casting was the main one
Look in the V
Some tappet bores have machine marks, some don't
Etc etc
Yes I agree with you
But the bad casting was the main one
Look in the V
Some tappet bores have machine marks, some don't
Etc etc
Datatek
Well-Known Member
Cracked heads are rarer than liners, timing chains are good for 200K with good servicing, the V8 will have expired at least once by then, although most don't go far as they guzzle too much petrol, injectors are good for very high mileages, HP is perfectly adequate unless you need to show what a big man you are to handle the V8 power, the torque is not ideal but is well masked by the auto box, 6 cylinders is more than enough and the M51 doesn't sound like it has a permanent misfire.I agree, all you have to put up with is..
Cracked heads
Timing chains
Injector(s)
No HP
No Torque
Only 6 cylinders etc
V8's are anti social in modern times with their highly polluting thirst.
Henry_b
Think outside, no box required.
Should of used the 6cyl Vm unit in the P38
Twas better!!
And Anti social, what a load of twoddle.
My V8 did 18mpg on LPG and Petrol. twice the capacity of your diesel mind you
Compared to the M51 which does 23.
Datatek
Well-Known Member
Long term average on mine, I log the mileage and brim it every time, is 24mpg, close to 30mpg on a run and that's not the fantasy from the message centre.Should of used the 6cyl Vm unit in the P38
Twas better!!
And Anti social, what a load of twoddle.
My V8 did 18mpg on LPG and Petrol. twice the capacity of your diesel mind you
Compared to the M51 which does 23.
I agree the M51 is a poor engine (but robust), only BMW could make a 6 that suffers so much vibration and so little low end torque. The 4 cylinder engine in my Transit is much better. I would agree that the VM in line engine is also better than the M51 but not the V6.
Henry_b
Think outside, no box required.
The VM 425 used in the RRC is hard to beat for Low end Grunt.
The VM I6 used in the Grand Cherokee was wonderfully smooth for a derv and had loads of torque.
MPG depends.
My V8 did 18 around the doors and upto 24MPG on a run..
Brim to Brim too.
The dash was a tad optimistic.
There was a strong rumour that they received a bad batch of casings but said nothing and carried on. Bit like the RF receiver that was a known problem, only fixed after production stopped. Every car still in warranty should have been retrofitted. With a large discount on price for a new receiver for all the others. Car makers do that and get away with it. Fix for the Triumph 2.5 Pi thrust bearings spinning was a self tapping screw. Badly designed blocks were never changed.
Datatek
Well-Known Member
A version of the VM used in the Chyrsler Voyager suffered cracked heads.
You must have a very special V8 or a lot of the miles were done on the back of a recovery vehicle.
Henry_b
Think outside, no box required.
Yes they chromed the head faces IIRC in latter iterations.
Nope she ran really well, 18mpg - 24Mpg not bad considering my TD5 does 23.
Datatek
Well-Known Member
Not seen any chromed heads, they did alter the design though.
Henry_b
Think outside, no box required.
Datatek
Well-Known Member
There are a lot of them in boats, not as good as the old Volvo Penta's though.
Henry_b
Think outside, no box required.
RangeRoller dt
Well-Sprung Member
A standard 2.5 DSE has more power on paper than the larger, thirstier twin carb 3.5 V8
without the unreliability issues (so much)
Henry_b
Think outside, no box required.
A standard 2.5 DSE has more power on paper than the larger, thirstier twin carb 3.5 V8
Yes the Turbo intercooled 6 pot diesel has the same power as a carb'd low comp v8 from the 60s
And even @wammers will agree that the 3.5 was a pretty bombproof unit..
RangeRoller dt
Well-Sprung Member
Wow, I’m amazed you admitted it
TwoAndAQuarter
Member
I'm quite fond of my dirty diesel P38... I've had a few V8s in other motors and loved them, driven V8 P38s and they're lovely, but there's something about the reassuring 'chugachugachugachuga' that gives me a warm feeling inside. (Probably caused by the overheating...)
Anyway, head is off and cylinder 6 (rearmost) looks a wee bit cracked:
Yes I could get the AC TIG on it, but it'll probably open up again. I do have a spare head that came with the car, however someone has cross threaded an injector, so that will need repair along with pressure testing.
For comparison's sake, this is how all of the other cylinders look:
Anyway, head is off and cylinder 6 (rearmost) looks a wee bit cracked:
Yes I could get the AC TIG on it, but it'll probably open up again. I do have a spare head that came with the car, however someone has cross threaded an injector, so that will need repair along with pressure testing.
For comparison's sake, this is how all of the other cylinders look:
Yep have scrap head in my garage cracked exactly the same way but on number two cylinder. Changed it for the nephew a few years ago.
TwoAndAQuarter
Member
I'll strip down that head and salvage the cam and valves (all of which are in excellent condition).
Remember I said the car came with a spare head? Cleaned the carbon off it this afternoon and, as Cilla would've said, surprise surprise....
Is it worth knocking the swirl chambers out firstly to see how far the crack extends (purely inquisitive), but also to keep as spares? Do they come out easy with a bit of heat and a drift?
Now to find a good example, third time lucky!
Remember I said the car came with a spare head? Cleaned the carbon off it this afternoon and, as Cilla would've said, surprise surprise....
Is it worth knocking the swirl chambers out firstly to see how far the crack extends (purely inquisitive), but also to keep as spares? Do they come out easy with a bit of heat and a drift?
Now to find a good example, third time lucky!
Does it have (or had) a power box fitted?
