AAZ Oil Consumption & Vibration

Post by **garyd** » 11 Sep 2007, 20:43

My AAZ is running fine but seems to be using excessive amounts of oil. A few drips underneath but that's obviously not where it's going. I assume that it is being ingested. There is evidence of oil at the breather system joints.

Can any other AAZ users tell me what sort of oil consumption you get? Mine must be well in excess of a litre per 1,000 miles.

The other issue I have is a slight vibration at around 15-1800 rpm ie when top is pulling around 45 mph (1.6TD syncro gearbox & 205x14 tyres) . It is worse when loaded or climbing (ie more throttle) but detectable even when on the flat. Any ideas? Would a slight fuel leak around the pump or no1 or 2 injectors be a clue to something?

thanks
Garyd

Post by **HarryMann** » 11 Sep 2007, 22:26

My AAZ is running fine but seems to be using excessive amounts of oil. A few drips underneath but that's obviously not where it's going. I assume that it is being ingested. There is evidence of oil at the breather system joints.

Quite normal, just breathing causes those weeps and drips around the inlet dowpipe and elbow. If its from the centre of the turbo too, then that's a different thing.

Can any other AAZ users tell me what sort of oil consumption you get? Mine must be well in excess of a litre per 1,000 miles.

Much better than that If I could find space for 1/2 litre over 1000 miles I'd be surprised, last 1000 miles was about 1/4 litre in one weekend, so a litre is using it a bit. Mine was probably using that at its worst, before rebuilding it. Do you know the oil temps it gets to.

The other issue I have is a slight vibration at around 15-1800 rpm ie when top is pulling around 45 mph (1.6TD syncro gearbox & 205x14 tyres) . It is worse when loaded or climbing (ie more throttle) but detectable even when on the flat. Any ideas? Would a slight fuel leak around the pump or no1 or 2 injectors be a clue to something?

Thats the propshaft or the output bearings at either end of the transmission I'd think. You could try altering the alignment of the front diff, or replacing all the mountings if they're originals (an expensive proposition).

Try this for the oil consumption...

Check the advance is right (1mm or just under)
If it goes quite well enough, turn the fuel down a bit (1/4 turn) or back the LDA boost fuel off a bit.
Change to a fully synthetic - FUCHS Turbo Diesel Titan oil is affordable (less than £20).

Can't remember if its got an oil cooler?

Post by **garyd** » 12 Sep 2007, 12:34

Thanks Clive,
no idea of oil temp but water temp is fine. No additional oil cooler fitted.

re vibration - forgot to mention that the prop is off. When fitted it rattled badly as the vibration occured. It seems to be engine revs related rather than road speed.

Garyd[/i]

Post by **andysimpson** » 12 Sep 2007, 20:20

Vibration could be a balancing issue or misfire. Check the crank pulley for wobble when its idling. If its a misfire it could be lots of things:

if it has a fuel filter with 4 hoses these are REALLY common for bad running/misfires

air leak before fuel pump.

sticking fuel soleniod switch.

incorrect settings on pump or timing wrong.

Post by **maddog334** » 04 Jun 2008, 22:43

Can you please tell me how the 4 hose filter causes misfires as I have a vibration around 2000-3000 rpm on a new installation of a 1.6 diesel ( using the later t25/t4 4 hose fuel filter)
Many Thanks
Martin

andysimpson wrote:Vibration could be a balancing issue or misfire. Check the crank pulley for wobble when its idling. If its a misfire it could be lots of things:

if it has a fuel filter with 4 hoses these are REALLY common for bad running/misfires

air leak before fuel pump.

sticking fuel soleniod switch.

incorrect settings on pump or timing wrong.

Post by **HarryMann** » 04 Jun 2008, 23:22

Martin,

I gather from Andy that those filters have a propensity to let air back in through the silly clip fitting return line until the fuel gets up to temperature.

GaryD

Just to differentiate prop-rattle and transmission vibration/prop vibration...

Prop rattle is common esp. on diesels and occurs when lugging in a high gear at typically 1000 ~ 1400 rpm and not so much anything to worry about , though annoying (and can be ameliorated by everything being factory fresh)

Fundamental prop vibration/transmission vibration occurs at a road speed of 35-50 mph depending on the diff ratio, will peak at the same speed regardless of gear, even be felt in neutral. Can be caused by a whole host of things, from UJ wear, prop balance, transmission misalignment, tx output or front diff. input bearing wear etc.

Post by **garyd** » 06 Jun 2008, 20:22

Going back to my original posting on the question of excessive oil consumption. After much thought, the light came on and reminded me that although the (AAZ) engine came well recommended, the turbo was transferred from the original JX engine. The JX was discovered to be in a very poor condition and therefore put a big question mark over the turbo.

Eventually, I have bitten the bullet and had the turbo rebuilt. Apparently not only were the bearings and seals worn they were bad enough that the impellers were hitting the casing!

An expensive rebuild then but now the whole vehicle is quieter and you can hear the turbo spinning up as the rev counter gets to 2,000 rpm or so on the way through the gears.

Not been able to drive it far enough yet to confirm reduced oil usage and have injured my hand so driving at all for some days yet!

cheers
Garyd

Post by **HarryMann** » 06 Jun 2008, 22:44

Some details on who did the rebuild and roughly what it cost handy as another on Tech needing and asking same..

https://club8090.co.uk/forum/viewtopic.php?t=35686

impeller touching casing... ?

You should have seen mine , wasn't much impeller or casing left

Post by **garyd** » 07 Jun 2008, 10:20

Turbo rebuild was done by:
Turbo Repairs
43 Lyndhurst Avenue
Blackpool
FY4 3AX

01253 407646

I found them from their website turborepairs.com

Original quote for new bearings and seals was £250 included two way carriage. Went up to £350 when new shaft & impellers required. Took less than a week from pick-up to delivery.

Comment on quality - they didn't clean up the exhaust mating faces or replace the exhaust studs as I thought they might. They did provide written advice about making sure there was a plentiful supply of oil through the turbo before firing up the engine.
Garyd

Post by **HarryMann** » 07 Jun 2008, 13:06

Thanks Gary.
Did they balance the shaft (2 stage process) ?
I too would expect the mating face to be trued up for that sort of money...

Post by **garyd** » 07 Jun 2008, 14:24

Maybe they considered that I had done a good enough job with the file when I fitted it to the AAZ?
Garyd

Post by **slobbo** » 16 Jun 2008, 21:30

I had the AAZ in my Syncro and was never satisfied. I blew 2 turbos, had numerous oil leaks (all repaired quickly), I had 3 fuel pumps, it was pathetic on the motorway and used copious amounts of oil (at least a litre every 700 miles), stank and basically pissed me off. This was on a recently rebuilt engine with new heads etc. It never seemed to stay in a state of good tune.

The oil consumption and eventual smelly state of the engine was probably because I had the turbo and fuelling too high but it was pathetic on the motorway so I had to try something. When I say pathetic it would labour and loose speed going up a slight incline at 60 mph. Not a hill mind a slight incline. It is now in getting a TDI. Can't wait.

Post by **andysimpson** » 16 Jun 2008, 21:39

slobbo wrote:I had the AAZ in my Syncro and was never satisfied. I blew 2 turbos, had numerous oil leaks (all repaired quickly), I had 3 fuel pumps, it was pathetic on the motorway and used copious amounts of oil (at least a litre every 700 miles), stank and basically pissed me off. This was on a recently rebuilt engine with new heads etc. It never seemed to stay in a state of good tune.

The oil consumption and eventual smelly state of the engine was probably because I had the turbo and fuelling too high but it was pathetic on the motorway so I had to try something. When I say pathetic it would labour and loose speed going up a slight incline at 60 mph. Not a hill mind a slight incline. It is now in getting a TDI. Can't wait.

Obvisoulsy a bad rebuild and poorly set up then. IF your disapointed with an AAZ your in for a real nasty shock with the TDI.

Post by **HarryMann** » 17 Jun 2008, 15:10

This was on a recently rebuilt engine with new heads etc.

Heads? It was a multi-headed monster, a mythological Hydra, Typhon or just a weird Polycepahalitic entity?

When I say pathetic it would labour and loose speed going up a slight incline at 60 mph. Not a hill mind a slight incline.

Oh dear, doesn't sound like a good AAZ to me, somethings seriously wrong with that! What sort of pump did you have on it and was the throttle arm actually getting anywhere near full travel (I had that problem

)

Would you have that old engine for sale? Or bits from it?

Post by **slobbo** » 17 Jun 2008, 19:39

Already gone I'm afraid.