Titanium Grey S4 Avant

[Rikki Kitto]

There is a place near my work in Edgware called Middlesex Rebore look them up

[hunker7]

Guys, how much does crankshaft polishing/balancing cost approx.? And where can I do it?

[hunker7]

How did the petrol get into the sump? I presume from an injector leak?

I haven't read further back than this page so forgive me if this has been covered. Obviously a leaky injector will cause bad starting but I guess you could have hyro-locked a cylinder? Hopefully not though!

It was leaking injector yes, but once I swapped in a replacement, engine started with occasional misfire, next morning she started and was barely ticking over, and had a loud knock. When i remove all the plugs, engine turns over easily without knocks.

I am thinking, oil was too thin and it all dripped into the sump, and when I was starting it I spun the bearing.

[bikerjim]

How did the petrol get into the sump? I presume from an injector leak?

I haven't read further back than this page so forgive me if this has been covered. Obviously a leaky injector will cause bad starting but I guess you could have hyro-locked a cylinder? Hopefully not though!

[hunker7]

Does it still turn over ok. Maybe so much petrol in the oil the tappets sent pumping up right?

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Level is just above maximum so it's not huge amount, but enough so when I remove dipstick oil drips off it

[diesel des]

Does it still turn over ok. Maybe so much petrol in the oil the tappets sent pumping up right?

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[hunker7]

Crack on the manifold is tiny, no way it sounds that bad. I'll remove oil filter then, and check for metal particles in that.

Why would it not start though?

[Error404]

As I suggested above I would first start by cutting open the oil filter and check the filter media for debris. I do this on my oil change anyway
If there is particles in there you can take the sump off and check the main and big end bearings. Don't run it again, if you have spun a bearing next thing will be a rod through the block.
Badly cracked manifolds can sound appalling sometimes, you might be lucky and find that is your nasty noise

[newsh]

Are you sure the noise isn't just the exhaust manifold leaking? Didn't you do a stud repair on the cylinder head? Maybe the repaired stud has come loose?

[hunker7]

Oh dear.

...and then it doesn't start properly, and there is a crack in exhaust manifold

[Error404]

Oh dear.

[hunker7]

Head bolts are XZN or Triple Square as they are sometimes called.
What makes you think you spun a bearing? Would be pretty unusual for a seasoned engine to spin a bearing, plus they will often block the oil gallery through the crank causing catastrophic failure

Thanks

Fuel got into the sump, and made oil pretty thin, and also because it sounds like this?

[Error404]

Head bolts are XZN or Triple Square as they are sometimes called.
What makes you think you spun a bearing? Would be pretty unusual for a seasoned engine to spin a bearing, plus they will often block the oil gallery through the crank causing catastrophic failure
Taking head off won't help you check the bottom end. Take the sump off and check mains and big ends. I would cut open and check the oil filter first and see if you have any debris in the oil system.

[hunker7]

My bad luck isn't over. By the looks of it she spun shell bearing so knocking is pretty bad. Next job is taking off the head and seeing what's going on. What do I need for head bolts, spline?

[newsh]

Brake cleaner is also ok but carb cleaner melts plastic