Audi dwiesel tappet noise..

[Monkey Harris]

I cant remember where it gets is oil feed for the head but also is the sump damaged ie have you pushed it up by putting a jack under the sump whilst doing the belts it may have been damaged before, and this has finally closed up the clearance, this can effectively reduce the clearance from the sump bottom to the oil pick up pipe a little like turning a tap off and restricts oil flow to the pump at high engine speeds because the faster the engine goes the more it loses oil through the bearings etc, it is a growing problem on cars now the transit / jag mondeo engine suffers from it, if its tin sump has been pushed up. Also some engines suffer from the gauze blocking with debris also.
they are usually fine at low speed but gradually loose oil pressure as they are rev'ed

No problem with the sump..

I know what you mean ,
I've built pinto engines with shortened sumps and Made the pick up shorter..

I did raise the car 6" , to make it less of a back breaker to work on it,
but raised it on a big crossmember .
Thanx for your advice.

 

[dannyp]

i've had a few 16'vs that have had tappet clatter when hot hot after a hard thrash due to low oil pressure new pump didnt fix it but £20 set of big end shells did

 

[scotb]

change the oil pump and fit a genuine filter.dont try boosting the pressure by altering the relief valve either as it just blows the filter off. common fault on vw transporter 2.4 diesels.

 

[normspanners]

change the oil pump

but why would the pump, just suddenly have low pressure ? oil filter with a faulty none return maybe but if nothing was touched on that side seems a little odd ?
I did have a ren master once that wouldnt pick the oil up after a service and that was the pump so we overfilled it and it did eventually pick up but not reliably but i think the oil pump pick up
o rings had gone brittle.

 

[scotb]

been there with a fleet of vehicles.

 

[razordog]

been there with a fleet of vehicles.

Stand on brake pedal if noise abates or changes its brake vac pump, check oil pressure with test kit, its usually hydraulic tappets , camshafts wear but those engines are capable of 500k

 

[Monkey Harris]

today i have changed the lifters for a new set...

and tbh it sounds no different ,
the new lifters may still need a good run, ive oly run it for a couple of miles

ive also changed the timing to some old marks that were there,
which was one tooth different on the crank pulley

without major surgery of a new oil pump or new main bearings, i cant figure whats chattering ,
not the vacumn pump or any thing on the ancillary belt ,

following a timing belt change, i was figuring it will be something at the top end ..

 

[dannyp]

daft question, have you tryed takeing the ancillary belt off and running it

 

[Monkey Harris]

daft question, have you tryed takeing the ancillary belt off and running it

yup makes no difference ,
i have also removed the vacuum pump push rod ad that makes no difference,

im now bewildered, and thinking it may be bottom end noise...

 

[normspanners]

ive also changed the timing to some old marks that were there,
which was one tooth different on the crank pulley

How did it run on those old marks, re white smoke ?

 

[dannyp]

put a capliary oil pressure gadgue on it. at about this point i'd be getting stubborn and droping the sump to have a look tho

 

[Monkey Harris]

How did it run on those old marks, re white smoke ?

It ran well pulled ok, no smoke while driving,

tricky starting and some white smoke then,
It's been like it since its been tapping,

 

[Monkey Harris]

I'm thinking this will be the next step,

Does the oil pressure sender go in place of the pressure switch,
I don't get an oil warning light on when driving,,

 

[Monkey Harris]

oil pump required

Can you give any pointers into doing this @scotb

 

[normspanners]

without major surgery of a new oil pump or new main bearings,

Thing is it may not be the bearings it could just be a broken pressure reg spring, quite simply causing low pressure I had just the opposite with a vauxhall astra derv it would lose power at high speed when hot, I checked the oilpressure and it was about 150psi!! so was doing the exact opposite and was pushing the lifters out too much, I could not believe it as the van had done well over 200K ok the valves seats had recessed as well, but when I fitted a new OP valve and spring and got the pressure down to 80ish it ran fine for years.

 

[normspanners]

Does the oil pressure sender go in place of the pressure switch,
I don't get an oil warning light on when driving,,

if it is a broken spring you wont get a light on, the oil pressure light works just to tell you you have NO oil pressure about 3-7 psi, so with a broken spring the pressure will keep the light out, but the pressure will not increase as the engine speed increases then the load on the lifters increases and the oil loss at the bottom end increases so starving the cam gear allowing the lifters to back off, the exact opposite to that astra.

 

[Monkey Harris]

if it is a broken spring you wont get a light on, the oil pressure light works just to tell you you have NO oil pressure about 3-7 psi, so with a broken spring the pressure will keep the light out, but the pressure will not increase as the engine speed increases then the load on the lifters increases and the oil loss at the bottom end increases so starving the cam gear allowing the lifters to back off, the exact opposite to that astra.

Great posts I will have a google of pressure relief switch on a 2.5 tdi engine..

 

[normspanners]

just get aoil pressure gauge cost you about £10/20 put it in where the oil pressure sensor usually goes and read the pressure hot and at speed I usually run them out under the bonnet and by the winscreen so that it can be seen throught the window.
EG http://www.ebay.co.uk/itm/Wave-Box-...078855?hash=item3cfeb16ec7:g:ZTsAAOSwyQtVqRUT

 

[dannyp]

the oil light is pritty much pontess tbh, it dose reassure you the pump has primed after an oil change but thats about it. ive only seen the oil light ever come on a few times on any of my cars, on a mk4 when i smashed the bottom off the sump, on the golf when a conrod went through the pump, and on the same golf when it shat it's shells ( it dose get some stick so i forgvive it)

hence we usally refer to the oil light as, EFL engine f***** light, engine conversion indicator , ect ect ect.

usally just screw the capillary gadgue in one of the oil pressure switch ports m10x1 seems to ring a bell.

i'm happy if i see it hold 1 bar at idel hot, should rapidly rise with revs to 3-4 bar by 2000 rpm and then hold steady

 

[normspanners]

on a mk4 when i smashed the bottom off the sump,

Stupid system that, my passat has done it twice, sorry, I have done it twice ( fitted a sump guard now) and the oil light only comes on once, if you stop the engine and restart it the light doesnt come on again, so you think oh its ok, I have oil pressure---- wrong!!