Audi dwiesel tappet noise..

[normspanners]

from memory to set the pump timing it's dial gauge job into the back of injector pump

in conjunction with cam timing so if cam timing is out it's guaranteed pump will be out.

I've checked the timing,
Cyl 1 at tdc, and no 1 cam lobes are flat ,
both valves shut , mark on flywheel is visible,

That is what is worrying me, it should not just be visible, it should be spot on mark.
IRC the cam has a slot across the front for a bar to align with the head face, it can be done by eye, if that is lined up and pump timing ie pulley nut disturbed or not moved when belt was changed it should be close enough

white smoke could also be u/s glowplugs

would have been smoking and rattling before belt change?

 

[normspanners]

HUM are you sure the rattle is not diesel 'grindle' , said by rolling you 'r's -------NO not twirking THAT ---by vibrating your tongue in the top of your mouth, usually sign she's over advanced.

 

[octo0072000]

Cheers I've checked the glow plugs there good,

I have now turned the engine over by hand,
and gave the lifters a push down and they all spring back up...?
They may be ok..or not..

Timing looks the issue..
Although I was very methodical marking the cam wheel,flywheel and bottom pulley

all you have done is the cam belt pump could have been out before you are supposed to change both belts as they do stretch a little hence why you need to redo the pump timing afterwards that from a VW mechanic that did mine on a T4 2.4 same engine

have you checked the glow plugs are working when it starts i believe they are supposed to stay on for some time up to a minute

 

[Monkey Harris]

Thanx for the input folks...


Monday round up..


I checked and double checked the tdc timing and it's right ,
and the marks I put on all parts still line up ,

I turned the engine over a few seconds at a time,
with an assistant, on the starter,
Glow plugs ,and an injector out,

and there were no noticeable knocking noises

The camshaft went round nicely with the followers rising as they went off cam,
I imagine..(That may not mean, there all primed with oil)

There was oil appearing on the lobes and vacuum pump rod,

With regards to the fuel pump belt ,
it was renewed when the pump was changed,
so is newer than the cam belt was,but may be worth changing ,

The pump and pulley on the camshaft end have marks on them that line up when the engine is on tdc..

I think I may change the oil..(it's due) and then try running it again..

Thanx again ..

 

[normspanners]

Had it with V8 Rovers

Ha just remembered my sdi rover did in a few hydraulic tappets so I just made my own adjustable pushrods worked a treat saved pulling the engine.

 

[Monkey Harris]

Sleeping on it .
I'm thinking the fuel pump, may/must be a bit out ..

 

[normspanners]

Sleeping on it .
I'm thinking the fuel pump, may/must be a bit out ..

I know you want to get it sorted -------- BUT,------------- didn't the cam and bearing carriers hurt your back?

 

[Monkey Harris]

He he he...

It was cold out there too..

 

[AndyStobbs]

Those fuel pumps can be a mile out on timing and they don't make any noise. Easiest way to verify/adjust fuel pump timing is a vag com if you have one.

Try a can of hydraulic lifter treatment from Wynns, good stuff.

 

[Monkey Harris]

Those fuel pumps can be a mile out on timing and they don't make any noise. Easiest way to verify/adjust fuel pump timing is a vag com if you have one.

Try a can of hydraulic lifter treatment from Wynns, good stuff.

ok will leave the pump alone ,

took it for a run to get some oil,
and had it up to 2500 revs still clattering ..

just carrying out an oil change ,
will give it a run to halfrauds tomorrow, and look for some lifter treatment

 

[Monkey Harris]

So here's where I am...

(I ended up with a clattery engine after a timing belt change )


I removed the lifters and dismantled and cleaned them,
(Instructed by youtube)
there all steel ,and there was minimal wear,
although the lifter on one exhaust valve ,had a more wear than others

So I decided to remove the head to see if there was any piston, valve or head damage,
There were no signs of valve or piston damage

But
..In the water gallery ,by the most worn lifter,

Were the remains of a rubber seal from the thermostat ,
( Examination of the stat provided the clue..)

It pulled out of the 3mm hole and I found the rest of it in the water...
it could have been floating around for years,
or it may have got wedged there after the belt change,

So I rebuilt the engine with a new head gasket,
All of This has taken many hours

I primed the engine with the glow plugs removed,
Put the plugs in and fired it up..
It sounded Supurb quieter than it ever has..

I revved it up to 2000 rpm and it was like a sewing machine..


But.....!
I ran it around the block ,
and within 5 mins it was clattering again...

I'm I right in assuming it can only be a dodgy lifter..?

Many thanx in advance guys.

 

[octo0072000]

if i went to all that trouble i would have changed the lifters while it was apart
over advanced on the pump will make it clatter as well

 

[roofman]

Iff it started up sounding nice and went bad after a short time then i wonder iff the lifters or lifter are getting starved of oil...or has been discussed a faulty lifter end off.They can appear to be perfect untill its put on a cycle.

 

[normspanners]

not sure if they do have this, but some cars have a oneway valve in the block/ head interphase area, that can block up with old oil etc and limit the oil supply to the cams etc, if it was ok after the restart it would make me think the supply was at fault.

 

[scotb]

oil pump required

 

[Monkey Harris]

if i went to all that trouble i would have changed the lifters while it was apart
over advanced on the pump will make it clatter as well[/QUOTE


There are 10 of em , at £10 each locally ,
I thought I would clean em and reuse em..

Tbh.. I can now change them in an hour,
I've ordered a set now at 6 quid each..

The car runs well but I will have a look at the pump,
It's still set as it was before the belt change..

 

[Monkey Harris]

Iff it started up sounding nice and went bad after a short time then i wonder iff the lifters or lifter are getting starved of oil...or has been discussed a faulty lifter end off.They can appear to be perfect untill its put on a cycle.

Im thinking much the same..
I've ordered 10 new ones..

 

[Monkey Harris]

not sure if they do have this, but some cars have a oneway valve in the block/ head interphase area, that can block up with old oil etc and limit the oil supply to the cams etc, if it was ok after the restart it would make me think the supply was at fault.

A good point, I'm not sure if it it has.
All the lifters were full of oil,
and when I pulled the cam cover,
to torque the head after it was up to temp,
there was oil everywhere in the cam cover..

 

[Monkey Harris]

oil pump required

There appears to be oil everywhere..
At 200k I suppose any things possible..
The engine runs well though..

 

[normspanners]

A good point, I'm not sure if it it has.

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