KV6 Oil pickup O-Ring ?

[roverbarmy]

I have a rattle on start up which is the cat (quietens down once it warms).

[Bolin]

Originally Posted by Lovel

Here is my experience on that o-ring. My Son had been experiencing some top end noise from his zs180 and off course he had been reading about the alleged o-ring issue, I thought it highly unlikely that this was the case, but he eventually persuaded me to remove the sump which is no mean feat if you are trying to avoid disturbing the exhaust manifold. Spent quite a few hours at it for nothing as the o-ring was indeed intact and had plenty squeeze and suppleness on it to be refitted, however what we did find in the sump was tiny fine metallic fragments which were non magnetic I thought perhaps were main bearing material.

Have fun removing the sump, especially the set screw nearest the front which needs to be cut in place with a modified hacksaw blade and the sump hanging half down. Fit a shorter set screw in its place as there is plenty depth of thread in the sump.

Later we fitted new tappets but this didn’t cure the rattle. (Btw it wasnt the manifold which was already eliminated). Eventually I pulled the engine and stripped (notice the I as son has a habit of sneaking off and doing something else and leaving to dad) it down to find the timing end main bearing had almost lost all of its white metal backing. This was quite scary to see as he has a heavy right foot and would have been only a matter of time before a conrod exited the crankcase or such.

So on one hand I think you are wasting time removing the sump as the o-ring will be intact, however on the other at least we discovered the contents of the sump which told us that the bearing were beginning to break up.

Thank you for that post Lovel, that is helpful to me too.

My car sounded like a diesel, so I did the belts (which were due), replaced oil pump (precaution, I have read of some cases of them under-performing with age) and then found that there was wear on the tappets and camshafts, so these were replaced too.

I also replaced this oil seal, and I also found some metallic pieces in the strainer (can't remember if I tested with a magnet).

Tappet noise remained after the work, but much much reduced, only really at start-up now. Slight rumbling/knocking noise present beforehand remained.

However, I did find sparkly bits in the oil after the work, and looking at the old oil, there were sparkly bits in that too.

Phil-T4 advised me that it is not that uncommon for bottom end bearings to fail. Reading on forums finds some mentions of this, with the culprit likely being not priming the oil filter after an oil change.

So does look like I need a bottom end rebuild. Which is beyond my capabilities at the moment so will cost £££.

I might get the oil tested first though, to be sure.

[Lovel]

Originally Posted by Bolin

Thank you for that post Lovel, that is helpful to me too.

My car sounded like a diesel, so I did the belts (which were due), replaced oil pump (precaution, I have read of some cases of them under-performing with age) and then found that there was wear on the tappets and camshafts, so these were replaced too.

I also replaced this oil seal, and I also found some metallic pieces in the strainer (can't remember if I tested with a magnet).

Tappet noise remained after the work, but much much reduced, only really at start-up now. Slight rumbling/knocking noise present beforehand remained.

However, I did find sparkly bits in the oil after the work, and looking at the old oil, there were sparkly bits in that too.

Phil-T4 advised me that it is not that uncommon for bottom end bearings to fail. Reading on forums finds some mentions of this, with the culprit likely being not priming the oil filter after an oil change.

So does look like I need a bottom end rebuild. Which is beyond my capabilities at the moment so will cost £££.

I might get the oil tested first though, to be sure.

Btw I did test the oil pressure with the engine running and it was good even with the poor bearings. Also camshaft bearings in head were fairly scored up, proving that this had been a neglected engine in the past.
.

[Bolin]

Interesting, I am yet to test the oil pressure but I think Phil said that the switch is before the bearings in the lubrication circuit so should test OK at the switch and loose pressure afterwards.

I think my camshaft bearings (the cuts in the head and cam carrier, no separate bearing surfaces) were OK, some wear but not excessive.

Those bearings don't look too good!

[Mgaz]

Well this thread got doom and gloomy lol

If it is as bad as all that, not sure if its worth it or not.

How much to fix those bearings?

I know every time I've done oil changes on cars I ALWAYS fill the filter with oil before fitting, but no idea on any previous owners/garages etc.

It is due a cambelt next year I think?

Its not done many miles since last time but its coming up to 6 years I think.

[vitesse]

Originally Posted by Mgaz

Well this thread got doom and gloomy lol

If it is as bad as all that, not sure if its worth it or not.

How much to fix those bearings?

I know every time I've done oil changes on cars I ALWAYS fill the filter with oil before fitting, but no idea on any previous owners/garages etc.

It is due a cambelt next year I think?

Its not done many miles since last time but its coming up to 6 years I think.

Echo your gloomy thoughts, but I've yet to do an oil change on my "diesel" V6 so will have an extra good look, but mine is noticeably quieter after just 50 yards up the road and it happens only when the engine is cold.

Regards

[SD1too]

Originally Posted by Mgaz

Well this thread got doom and gloomy lol
If it is as bad as all that, not sure if its worth it or not.

I have noticed the following principle, not only in this club, but in others too.

When faced with a choice of diagnoses ranging from reasonably straightforward to virtually stripping and rebuilding the engine, members always disregard the former and latch onto the latter?

Simon

[kaiser]

My engine sounded like a Diesel.
Was the VIS. Now dead quiet!

[Mgaz]

Originally Posted by kaiser

My engine sounded like a Diesel.
Was the VIS. Now dead quiet!

Have already replaced the manifold plus new/rebuilt VIS motors.

[Teflon]

Originally Posted by Mgaz

Have already replaced the manifold plus new/rebuilt VIS motors.

Did you ever find the source of your noise?

Cliff