Nasty!

Is that a helicoil in your pick-up strainer? (Not a sentence I ever expected to see).

 

It's sure is haha

Quite different design too, I guess yours is an automatic? I vaguely remember there being a different part number for the auto version, I think.

All I found in mine were a bunch of carbon granules. https://www.briskoda.net/forums/topic/481220-oil-pick-up-1416v/

Taking off to clean, I presume?

 

12 minutes ago, Wino said:

Quite different design too, I guess yours is an automatic? I vaguely remember there being a different part number for the auto version, I think.

All I found in mine were a bunch of carbon granules. https://www.briskoda.net/forums/topic/481220-oil-pick-up-1416v/

Taking off to clean, I presume?

 

Yep, it's automatic. I'm hoping someone has a idea to where I can find a reference for bearing play? 

 

No doubt the swarf from this top notch work has caused some damage. Maybe even causing this tapping.

 

The tapping Is far more obvious from undereath the car almost like its coming from the bottom end. Unsure is the sumps just acting like an echo chamber tho.

@sepulchrave is likely to know about bearing play, I should think.

Although it looks awful and it's undoubtedly bad workmanship I doubt any damage has resulted from that bodged sump plug repair.

That thing that looks like a helicoil is actually the stripped thread and is alloy rather than steel, the swarf is also alloy from drilling and tapping the plug thread, you can see that the pickup got bent when the drill bit slipped because the gorilla on the other end was pushing it too hard.

Alloy is soft and won't damage the hardened steel bearing journals, there may be some swarf embedded in the shells but the first place the oil goes after pickup is to the filter so I doubt it.

Side float is normal and necessary for the conrods.

Don't think the pick-up is bent, they just are like that, seemingly: Sací koš, 036115251AE, sací koš, olejová čerpadla, chladiče, uzávěry oleje, měrky oleje (amd-autodily.cz)

4 minutes ago, sepulchrave said:

Although it looks awful and it's undoubtedly bad workmanship I doubt any damage has resulted from that bodged sump plug repair.

That thing that looks like a helicoil is actually the stripped thread and is alloy rather than steel, the swarf is also alloy from drilling and tapping the plug thread, you can see that the pickup got bent when the drill bit slipped because the gorilla on the other end was pushing it too hard.

Alloy is soft and won't damage the hardened steel bearing journals, there may be some swarf embedded in the shells but the first place the oil goes after pickup is to the filter so I doubt it.

Side float is normal and necessary for the conrods.

Understood mate cheers for that. So this is more of a coincidence rather than a cause.

 

Any other ideas to what can cause this tapping noise? Ive either checked or replaced most of the obviouse stuff now. I'm aware you said this is just a design flaw but I have plenty of time to investigate other possibilities.

 

I've bought this car to fix and sell on. Originally thinking this would be a simple tappet replacement haha. Also it gives me a chance to improve on my mechanical skills. So I am more than happy to be digging around if there's any other possible causes? 

Since it's not lifter tick then it pretty much has to be little end or a broken ring.

Although the sump plug thread repair itself isn't the cause, the fact that it must have been losing oil prior to repair indicates that the engine may have been run until the oil light came on which likely caused premature wear through loss of oil pressure.

You can't really check without taking the head off and popping the rods and pistons out.

The sound does remind me of a little end problem I once witnessed at a track day, I'll see if I can find the thread in a bit.

Here you go, it was a circlip that let the gudgeon pin slide about, as Nige found out later.

There are bits of me in the first photo of this post :

My unusual Piston failure. Diagnosis would be helpful to stop reoccurrence. | Club GTI

Edited 20 April, 20215 yr by Wino

That's why Teflon buttons were invented for racing engines with floating gudgeon pins.

I notice some wag said there was a right way to install those circlips, like the idiots who say you should stagger ring gaps.

These things spin at varying rates in use so orienting them is pointless.

3 minutes ago, sepulchrave said:

the idiots who say you should stagger ring gaps

Such a Agra Engineering, Brodie Britten racing and Mountune for example?

12 minutes ago, KenONeill said:

Such a Agra Engineering, Brodie Britten racing and Mountune for example?

 

It's ancient lore, passed down from generation to generation in the grand verbal tradition.

It's also ritual magic, doesn't do any harm but doesn't make any sense either.

There's a lot of pub nonsense in tuning, 'every little helps' is for full blown racing engines where small improvements can make a big difference.

In the real world there is a hierarchy of mods that really make a difference and it all starts with getting more air and fuel into the cylinders, that means net gasflow, gross flow is irrelevant.