Tappet Adjustment - 2 litre A/C

[Rockhead_Rumple]

Been having some engine issues recently and has got me thinking I may have set tappets wrong...

Its a 2 litre A/C engine, 1981. As far as I remember, when I set the tappets I backed off the screw, and brought it in till it was just touching both the pushrod and the valve stem (ie no play), then wound it in a further 1 1/2 turns.

However from reading some posts, seems like this is for the 1.9/2.1 engines and NOT for the 2 litre a/c. More specifically this post:

https://club8090.co.uk/forum/viewtopic.p ... t#p7466492" onclick="window.open(this.href);return false;

where toomanytoys says it should only be half a turn from touching....

What is right for a 2 litre a/c?

[camper]

Aircool hydraulic tappet setting i would agree with toomanytoys half a turn from touching.The Haynes manual says diffrent two further turns.But on the occasion i repaired a overheated 2ltr cu engine on a T25 i had owned two turns was to much .The engine run much better with half a turn from touching.

[Rockhead_Rumple]

Anyone else got an opinion before I go and re-adjust them?

[toomanytoys]

Has it got hydraulic tappets??? if its runnign but badly it must have as a solid tappet would never start...

Do the 1/2 turn.. then report back...

I only do the 1/2 turn on the wbx too..

[Rockhead_Rumple]

Yeah its Hydraulic tappets, it runs fine and has done for a while, just abit down on power. Been looking into reasons why (compressions good), and thought if the preload is too much, the values arent closing properly and sapping my power. However this is just a theory lol

[toomanytoys]

If compression is good then the valves must be closing ok... so I would be looking at timing and fueling, when did it have a new dizzy cap rotor leads (Use only good quality leads, cheapo ones dont last very long), air filter etc etc

[Rockhead_Rumple]

Leads has been a while, probably worth replacing. I changed the dizzy a while back to another CU one but I actually think this one is worse and it seems slower lol. Aaaah ill just have to have a mess with it and change a thousand things to end up with the same performance.... lol thanks anyway toomanytoys

[toomanytoys]

Check everything and return it to the stock settings...
WHen you say the dizzy is worse than the old one, what was/is wrong with it/them??

[Rockhead_Rumple]

It just seems slower, less pick up under acceleration (ie pretty much none). I don't remember it being this bad on the old distributor. Methinks the vac unit is knackered. Reason for changing it was that the old one only had a single vacuum advance (possibly off a later 1.9), so I had been on the lookout for a stock CU one to see if it increased performance. However it seems to of had the opposite effect!

E D I T - By one advance I mean no retard on the vac unit.

[Damien]

It just seems slower, less pick up under acceleration (ie pretty much none). I don't remember it being this bad on the old distributor. Methinks the vac unit is knackered. Reason for changing it was that the old one only had a single vacuum advance (possibly off a later 1.9), so I had been on the lookout for a stock CU one to see if it increased performance. However it seems to of had the opposite effect!

Most CU's i have seen only have 1 vacuum advance

[toomanytoys]

If its not working properly then it wont help it.. it does need to be working and it also need setting correctly...

The CU NEEDS the correct dizzy, no 1.6 CT or wbx one should be used, nor should a 009 dizzy..

[Rockhead_Rumple]

Whats the serial number to identify a CU dizzy?

[toomanytoys]

I'll have a look...

So far VW part number 071 905 205 for all CU's

[Rockhead_Rumple]

Cheers man, ill have a look tomorrow and let you know how I get on

[toomanytoys]

Bosch part number should be... 0 237 023 007