Essexboyinwales · Feb 27, 2019

biketeacherdave said:
Thats fecked

I feared as much and will address whatever it takes to move forward. I have a question and without sounding stupid can you explain how it would affect the running / performance please ? the reason i ask the car ran perfectly before the engine was pulled apart to investigate coolant leak. TIA

biketeacherdave · Feb 27, 2019

The bores are aluminium not steel lined and are coated once that coating is worn then the rings are chewing up the ali which is soft, basically your piston rings are filling away your engine.

Recently had to do this to a mates engine, s/h bottom end

Mark Piercy · Feb 27, 2019

What progress they've made on these engines... aluminium bores with a tin paint coating...
Next thing we'll be using mobile phones to control your heater in your car .. Jesus effing Christ...
Rant over, leaving the room..

Henry_b · Feb 27, 2019

That is ****ed..

Have it lined or a new block..

Problem with having it lined is the lack of materiel in the M62..

This is a Lined block, the same thing happened.

6 out of 8 were lined, still driving my OCD nuts!! runs good though

pwood999 · Feb 27, 2019

Stick a Thor engine in. That way we all can help.

Essexboyinwales · Feb 27, 2019

biketeacherdave said:
The bores are aluminium not steel lined and are coated once that coating is worn then the rings are chewing up the ali which is soft, basically your piston rings are filling away your engine.

Recently had to do this to a mates engine, s/h bottom end

That makes perfect sense thanks for the explanation

Henry_b · Feb 27, 2019

Essexboyinwales said:
That makes perfect sense thanks for the explanation

Nikasil liners, quite a fragile coating, hates sulfer rich fuel..

With that said it still wears off naturally.

Would be interesting to utilise plasma spray bore, can't imagine it would be cheap though

Essexboyinwales · Feb 27, 2019

Mark Piercy said:
What progress they've made on these engines... aluminium bores with a tin paint coating...
Next thing we'll be using mobile phones to control your heater in your car .. Jesus effing Christ...
Rant over, leaving the room..

Essexboyinwales · Feb 27, 2019

Henry_b said:
That is ****ed..

Have it lined or a new block..

Problem with having it lined is the lack of materiel in the M62..

This is a Lined block, the same thing happened.

6 out of 8 were lined, still driving my OCD nuts!! runs good though

Plan B it is then and will use a spare engine i already have, hope that has a serviceable block I took a punt and brought it out of a scrapper that i never heard running

Henry_b · Feb 27, 2019

Essexboyinwales said:
Plan B it is then and will use a spare engine i already have, hope that has a serviceable block I took a punt and brought it out of a scrapper that i never heard running

Well dunt much matter what it sounded like as i hope you'll rip it apart and give it a refresh

Check the Bores thoroughly

Mark Piercy · Feb 27, 2019

Why were they not built with a well known steel liner instead of tin foil?

it's not progress is it

Saint.V8 · Feb 27, 2019

Later bores on the M62 were Alusil.....Nikasil went out in the 90's

Henry_b · Feb 27, 2019

Oh yes..

Brain fart..

RangeRoller dt · Feb 28, 2019

There were always problems with BMW nikasil liners in 90's

holidaychicken · Feb 28, 2019

As Saint says they are Alusil and not coated, the whole block is cast from 18% ish silicon aluminium and then bored, honed and etched or felt pad finished to expose the silicon for the rings to run on.
If you have a serviceable block then use that and make yourself a coffee table with the old one . You could have the one bore repaired but I would use an Alusil liner and not steel or iron although you only have 6 mm of wall between the bores

Grrrrrr · Feb 28, 2019

Mark Piercy said:
Why were they not built with a well known steel liner instead of tin foil? it's not progress is it

Weight? Reaction between different metals? Different expansion leading to dropped liners? Cost?!

Nikasil was fine with purer fuels and the UK should have been low sulphur since at least 2000. Might be some dodgy stuff on the continent after that. Not sure how Alusil stacks up.

Got a feeling my 2001 Jag might have Nikasil bores, although now I think about it I think they stopped using it around then.

Essexboyinwales · Feb 28, 2019

holidaychicken said:
As Saint says they are Alusil and not coated, the whole block is cast from 18% ish silicon aluminium and then bored, honed and etched or felt pad finished to expose the silicon for the rings to run on.
If you have a serviceable block then use that and make yourself a coffee table with the old one . You could have the one bore repaired but I would use an Alusil liner and not steel or iron although you only have 6 mm of wall between the bores

Removed heads from donor engine 3 am this morning and all looks good so far

Good advice with the non return valve in block it was in a desperate state. I suppose it would be wise to have this donor block tested ? Thanks again. The other half said it is a firm NO to the coffee table idea

holidaychicken · Feb 28, 2019

The pistons are ferrocoated as well as they are also aluminium which prevents galling between the similar metals and the piston rings are a specific type to run in aluminium which means it can get complicated if you start introducing iron or steel. Having said that I have read about iron liners being successfully introduced but for how long I don’t know.

ukadamwest · Feb 28, 2019

Henry_b said:
That is ****ed..

Have it lined or a new block..

Problem with having it lined is the lack of materiel in the M62..

This is a Lined block, the same thing happened.

6 out of 8 were lined, still driving my OCD nuts!! runs good though

as a question, why line 6 of 8 instead of all 8 ?

Henry_b · Feb 28, 2019

Grrrrrr said:
Weight? Reaction between different metals? Different expansion leading to dropped liners? Cost?!

Nikasil was fine with purer fuels and the UK should have been low sulphur since at least 2000. Might be some dodgy stuff on the continent after that. Not sure how Alusil stacks up.

Got a feeling my 2001 Jag might have Nikasil bores, although now I think about it I think they stopped using it around then.

the 4.2 had "normal bores aswell as later 4.0s

Member

Well-Known Member

Well fumbled member....

Think outside, no box required.

Well-Known Member

Member

Think outside, no box required.

Member

Member

Think outside, no box required.

Well fumbled member....

Dyed-in-the-wool 100% RR Junkie

Think outside, no box required.

Well-Sprung Member

Well-Known Member

Technician, Bodgit & Scarper Ltd

Member

Well-Known Member

Well-Known Member

Think outside, no box required.

Similar threads