Rebuilding a 4.6 V8

[Gizmo]

Oil and water don't go together, BMW thinking: "Lets put them together!"
Water and electronics don't go together, BMW thinking: "Lets put them together!"
I get the feeling BMW are reverse engineering 100 years of development just so they can push more cheap inferior parts for maximum profits through their Parts departments...

 

[Peter@AEW]

What symptoms would one experience if water starts getting into the gearbox from the heat exchanger? (E70 4.8i X5).

By the time you notice anything your gearbox is toast dead Kaput deceased passed on ..........I guess you now understand.

As a matter of preventative maintenance just change the heat exchanger at 200k.

Once you see oil floating in your cooling system it is late as the zf boxes do not like water mixed with atf as it destroys the clutches.

I have now flushed this box with 1 oil filter (R1000) and 13 liters of Synthetic ATF.

Waiting to drain and I will change oil filter again and fill the box for the last time.
We may just save it but no guarantee that it will be so.

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Did I mention that the ATF is at R285 per liter?

 

[P1000]

What symptoms would one experience if water starts getting into the gearbox from the heat exchanger? (E70 4.8i X5).

By the time you notice anything your gearbox is toast dead Kaput deceased passed on ..........I guess you now understand.

As a matter of preventative maintenance just change the heat exchanger at 200k.

Once you see oil floating in your cooling system it is late as the zf boxes do not like water mixed with atf as it destroys the clutches.

I have now flushed this box with 1 oil filter (R1000) and 13 liters of Synthetic ATF.

Waiting to drain and I will change oil filter again and fill the box for the last time.
We may just save it but no guarantee that it will be so.

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Did I mention that the ATF is at R285 per liter?

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Where did you buy the ATF, ZF? IME, if you need more than 8 litres, it is cheaper to buy a 20l drum.

 

[moranor@axis]

its not like BMW have a good track record for making reliable cooling systems :fencelook:

 

[RAArmstrong]

its not like BMW have a good track record for making reliable cooling systems :fencelook:

This is very true

 

[sclass]

Updates on the build as follows:

Had an engine oil leak from the dipstick tube to the sump which dripped roughly 1 liter of oil in 3 days.
Took a day to fix by changing a brand new O ring with another brand new O ring.
Hopefully it will not leak again however given how this project has fought us every step of the way I for one am not holding my breath.

We are now busy flushing the gearbox from the water that it was filled with from the leaking heat exchanger.
Have done the first oil filter change and will later do the final oil filter change and fill her up with the synthetic oil.

The first gearbox broke as a result of water being introduced into it via the heat exchanger, it was changed at ZF with an exchange unit however the heat exchanger was not changed.....we shall see.

Word of caution to high mile V8 owners with auto boxes......change your heat exchanger before it starts dripping water in the gearbox and destroys it.

Cost to replace box is R32k from ZF.

Sheesh.....does an E65 745i have this heat exchanger thingy :fencelook:....price...?

 

[Twinz]

Oil and water don't go together, BMW thinking: "Lets put them together!"
Water and electronics don't go together, BMW thinking: "Lets put them together!"
I get the feeling BMW are reverse engineering 100 years of development just so they can push more cheap inferior parts for maximum profits through their Parts departments...

I noticed that on the N54 platform. How the heck would BMW build such a stupid non-filtering PCV line and cheap PCV valves and leaving the customer to deal with oil/water buildup in the air intake, chargepipe, intercooler, turbos is beyond me. Fortunately, they have created a booming aftermarket to fix their oversight :=):

 

[sclass]

Oil and water don't go together, BMW thinking: "Lets put them together!"
Water and electronics don't go together, BMW thinking: "Lets put them together!"
I get the feeling BMW are reverse engineering 100 years of development just so they can push more cheap inferior parts for maximum profits through their Parts departments...

I noticed that on the N54 platform. How the heck would BMW build such a stupid non-filtering PCV line and cheap PCV valves and leaving the customer to deal with oil/water buildup in the air intake, chargepipe, intercooler, turbos is beyond me. Fortunately, they have created a booming aftermarket to fix their oversight :=):

Not really an oversight though is it,if we're honest....the car only has to last a little longer than the motorplan...then they want you to go get another one. The manufacturers, finance institutions, Insurers, etc all win while the customer only enjoys a brief period with what is now an expensive toy that keeps him permanently in debt . Maybe this is only fanatic talk though, average joe doesn't really care, as long as he's in the latest Xer....

 

[Peter@AEW]

Last oil change done and it is all red with no water residues anywhere.

Car idled for 5 hours and temperatures are all ok.

Hopefully it goes home tomorrow.... and I see it again at 2000km for oil change and final tightening up on any loose bolts nuts.

Needs O2 sensors as left bank is running very rich.

I am happy with the way the engine sounds.

 

[Andy1GP]

At long last the frustration nears its end

 

[Flash-Gordon]

 

[sash]

nicely done peter. we would all love to hear the sound of it...,

 

[Peter@AEW]

Car is with its owner who was grinning from ear to ear even though the car was lumpy due to faulty O2 sensors which are in the process of being changed whilst the exhaust system is being redone at Powerflow in Edenvale.

Car idled for roughly 3 hours this morning and the motor sounds solid I am pleased to say with no oil leaks or water leaks.

I took it for a drive with Peet and I immediately felt that the Air Mass meter had given up the ghost so I unplugged it and the engine would rev freely under load.

The gearbox is shifting so smoothly you can hardly feel the gear changes.
Peet reckons that it is shifting smoother than when they first installed it.

Now I must tell you that Peet is not shy to look at the rev counter sitting at the South East orientation and once the exhaust is done he will be frustrated with not being able to get it there as the motor needs to run in :roflol:

Just as an aside what is it with Beemers that as soon as you leave air flow meters or viscous couplings off the car they just break?

On Jezebel and Alex's as well as the 740 we had the viscous go whilst they were being worked on and on this one as well as the 740 we had the air mass meters go.

I sure am puzzled

 

[Crash_Nemesis]

2nd time a Viscous went on Jezebel due to sitting out of the car...

 

[Flash-Gordon]

BMW - Big Money Works :fencelook:

:rollsmile:

I once was told, a machine that stands is a machine that breaks :fencelook:
So drive up gents :rollsmile:

Glad the monster is alive, good going gentlemen :bravo: :bravo: :bravo:

 

[Fordkoppie]

Don't know about the MAFs, but Viscous fans needs to be stored upright

 

[sclass]

Don't know about the MAFs, but Viscous fans needs to be stored upright

Would you know why that is?

 

[RAArmstrong]

Don't know about the MAFs, but Viscous fans needs to be stored upright

Would you know why that is?

I'm sure Fordkoppie knows more than me, but I was told that they leak the fluid out of the clutch :dunno:

 

[Peter@AEW]

The feedback is that the engine is throwing an O2 sensor error as well as a left bank cam position sensor error.
Somewhat strange as we replace the left bank sensor and O2 sensor with a new one and it still throws an error.

Right bank (drivers side) is overfuelling with no errors.

Any ideas boys?

 

[Gizmo]

Check the engine wiring harness for damage or breaks. Could look like Hoonigan's for all we know...

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Is it possible that O2 sensors are switched around? That can cause over fuelling.