Classic Knock, knock , knock investigation....

I dropped the sump today and noticed that there are scuffs on each side the cylinder caps. I'm assuming this is the source of the sound. I seem to have good oil pressure and the compression test, dry and wet provided excellent results. There was bugger all metal in the oil in the pan.

Is this fixed by bottom end bearing shells changes or is it the bearing shells on the cylinder caps?

If it's the cylinder ones I might have to bin the vehicle due to time constraints. I was hoping to poke in some shells on the accessible caps.

Cylinder caps? Do you mean thrust washers In the main bearing cap or the big end caps

I mean the connecting rod caps seemed to have scuffing on them...all of them. i was wondering if this was caused by worn shells on the main bearing caps., ie the main journals, not the ones the connecting rod and piston are connected too.

Does this make sense? the scuffing in on the caps with the bi-hex nut, not the 17mm caps.

Excess float on the crankshaft? Are the thrust washer worn

tomcat59alan said:

Excess float on the crankshaft? Are the thrust washer worn

Click to expand...

From memory they are part of the center main bearing.

I haven't been able to pop one out yet, I re-attached the pan as we are expecting thunder storm, looking at the whole thing, the main ones at each end need the engine out, but the others seem like I would be able to pass the new shell around with a bit of a fiddle.

Have you checked Saints how to in the technical archive. If the mains were worn then you would get a rumble not a knock. If the thrust washers were worn then you would get excessive end float of the crank possibly allowing the side of the big ends to rub on the crank.Is yours manual or auto? I've seen crank float that could be measured with a ruler when the clutch was depressed.

Main shells and big end shells can all be done with engine in car....

Scuffs might be normal where they have squared of the sides and not finished it properly.
Really need pics.
This is if you mean the the side that faces you and not the bit that faces the crankshaft.

Mines be auto. I couldn't really see anything that they would rub on, so maybe it's just the way they are. I'll take a snap tomorrow. I'll check out Saint's How To. I was looking in the tech archive and must have missed it.

With the stethoscope, the sound did appear to be low down. I was trying to find a video that had sound on Youtube. The good news was that nothing fell off, which is always a bonus and what I usually expect.

Did you pull the belts off and see if the noise is still there.

No, I haven't, but this is the closest to the sound I can hear:

Not had owt to do with v8s for a very loooong time but sounds to me like a dry b00lock lifter !

says it was main bearings...but who knows.

Surely if it were your main bearings your oil pressure would be down !

That's what I thought, but it seemed okay, but I've just tested my sensor switch and it appears to be goosed.

I'm sure @Saint.V8 will be along to steer you in the right direction !

Okay, story of my life...cannae get the fecking bolts of the main bearing caps. Is there loktite on 'em or summit?

Here is the pics of the scuffs or finishing grinding or whatever . it looks like it's meant to be like that

Bonus pic of my dog with a rabbit she caught:

At least you know wot's for DINNER !

lorri789 said:

Okay, story of my life...cannae get the fecking bolts of the main bearing caps. Is there loktite on 'em or summit?

Here is the pics of the scuffs or finishing grinding or whatever . it looks like it's meant to be like that

Bonus pic of my dog with a rabbit she caught:

Click to expand...

yes its just how they are finished, how big a breaker bar have you used