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[05omegav6]

They are all perfect

Hmmm, this is my convinced face...



 

[JamesV6CDX]

They are all perfect

Hmmm, this is my convinced face...



 

Lol!!!

Sadly to me, investigating as an outsider, the old plugs are an unknown to me

But if daz / Steve think they were ok, I've no reason to disbelieve

[Steve B]

james i cannot explain the knocking straight the way on start up...

 But this is one thought.....before i had belt/stat ETC done i never ever seen any 300 codes..now i see them all the time once the engine gets up to temp...Well lets face it. car never got up to full temp with stat wide open and how cold it was a few weeks ago.but now it gets up to temp ..And thats when codes come .. Just a thought

[05omegav6]

james i cannot explain the knocking straight the way on start up...

 But this is one thought.....before i had belt/stat ETC done i never ever seen any 300 codes..now i see them all the time once the engine gets up to temp...Well lets face it. car never got up to full temp with stat wide open and how cold it was a few weeks ago.but now it gets up to temp ..And thats when codes come .. Just a thought

Mine was the same... the second the fans kicked in, 0300, 0306...

[Steve B]

When the belt ETC was done.. i turned the key for the first time and it was Knocking like hell...We then instantly ended up in my boot going through all the waste to have a second look at the old plugs,To make sure no electrode had fell off (i remember that part very well) All old plugs were good

[JamesV6CDX]

We may never know...

But we need to sort out the compression issue before even contemplating looking at anything else.... Else we will just chase our tail

[JamesV6CDX]

When the belt ETC was done.. i turned the key for the first time and it was Knocking like hell...

This is my worry and why I'm worried a foreign object was introduced at this stage.

Why would it be fine before and then knock so much after the work, to the point it has to be stripped to Check it all again?

If the engine had been turned loads and loads the lifters might be depleted of oil, but I sill wouldn't expect the noise to be of such concern that it warrant a further strip down...

[05omegav6]

Anything bigger than an electrode would have been much more devastating... and I suspect the damage is only as it is because it happened at idle... higher revs under load and the debris would have been cleared out by the combustion process...

Anything smaller simply wouldn't damage anything...

[Steve B]

When the belt ETC was done.. i turned the key for the first time and it was Knocking like hell...

This is my worry and why I'm worried a foreign object was introduced at this stage.

Why would it be fine before and then knock so much after the work, to the point it has to be stripped to Check it all again?

If the engine had been turned loads and loads the lifters might be depleted of oil, but I sill wouldn't expect the noise to be of such concern that it warrant a further strip down...

It deffo warranted a further strip down..It sounded bad..Like a lifter.....Timing Belt was rechecked..Aux belt was then removed to be sure  water pump was ok. then finally Cam covers were off again to make sure no foreign object had been introduced to engine.Plugs were also out again to check
Nothing was found....

[JamesV6CDX]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

[05omegav6]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

Could the rough valves be reground in the seat and the head refitted?

[JamesV6CDX]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

Could the rough valves be reground in the seat and the head refitted?

Possibly

But in the circs, I'd rather fit a known good head so there is no question

[Steve B]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

Could the rough valves be reground in the seat and the head refitted?

Possibly

But in the circs, I'd rather fit a known good head so there is no question

Cos you have piston rings thoughts in your head dont you 

[JamesV6CDX]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

Could the rough valves be reground in the seat and the head refitted?

Possibly

But in the circs, I'd rather fit a known good head so there is no question

Cos you have piston rings thoughts in your head dont you 

I still think valves are much more likely....

But if fitting a known good head still results in low compression - what else?

[05omegav6]

We might never know.

The important thing is. Will a good head fix the compression issue

I guess tomorrow will tell!

Could the rough valves be reground in the seat and the head refitted?

Possibly

But in the circs, I'd rather fit a known good head so there is no question

Cos you have piston rings thoughts in your head dont you 

There would be significant scoring of the bores if the fire rings had escaped... rather than simple machine marks