At what milage or time scale should the Valve clearences be done on a Impreza?

What is exactly involved and how much would this normally cost?

just curious so any info would be very much appreciated from you scooby legends!

 

MY'99 WRX will have Over Bucket shims to adjust the clearances - there is a SST (Special Service Tool) which the Main Stealer/specialists have to depress the bucket in order to remove the shim but still a fiddly job when done "in situ".
STi are Under Bucket Shims are require the cams to be removed to get to the shims so quite a big job.

Are you having running/idle issues or just curious to whats involved ?

Mick

 

Was just curious mate tbh
Thing is I swapped my 52 plate astra 2.2 sri for this uk spec turbo 2000 Tplate only tidy enough car but no service history and baing a subaru newbie I am just trying to find out as much as I can so I can get the car serviced up to date I have a new booklet and I want peice of mind as the milage is on 103k

Whatever needs to be done will get done Im not scared to spend money on my car in a way Im a bit paranoid about it as its my first turbo car but not first perfomance car I have come from a M3 then the astra.

So just wondering if they needed doing around this milage any help you can give would be appreciated also how much would this cost? and symtoms

 

Whilst I was aware that STi's had shims, I was not aware they needed adjusting?!? Certainly not on any service schedule that I am aware of.

 

my car is uk spec turbo 2000 would these have the same as sti?

 

err, both my UK MY97's are overbucket shims, and the two spare uk engines I have on the floor, not hydraulic.

 

Valve clearances should be checked at 100,000 miles or when ever the engine is apart/being re-built ( which ever comes first ).

Shaun - your spec C should have selective buckets - no chance of a shim being flicked out/dislodged at high rpm/power

OP - As in #3 - you should have Over Bucket/Outer shims in yours if its a UK MY'99/Version 5.


Mick

 

So is it the case of...

MY93-96: hydraulic self adjusting - no shims
MY97/98: shims under buckets
MY99/00: shims over buckets

...REGARDLESS of whether JDM, UKDM, AusDM, NZDM, EurDM, RoW, etc...?

 

^ Sorry my mistake - I'd never heard of any of them needing adjustment before... Apologies.

 

legends any ideas on how long this would take to do and how much it would cost at specialists?

 

Slight edit to the above

 

Cheers merlin... quite complicated to remember lol.

What exactly are 'selective' type buckets? How do they work, etc...?

 

The shim is actually part of the bucket joz and you swap the bucket for another "sized" one to gain the correct clearance.
Its done to reduce the weight of the valvetrain and eliminates the risk of flicking a shim out when running 'good' power/longer duration,higher lift cams etc etc.

Left to Right :

STi V2 RA Top Hat ~ STi V3-6 Inner ~ JDM V3-4 Small Outer ~ UK/WRX Large Outer ~ New Age Selective Bucket.






Stripped View of a Hydraulic Lifter to clean out big end bearing debris :






Mick

 

Mick, v. insightful post there!

There's a possibility that I'll whack in some STi 3/4 heads in place of my WRX 1/2 jobs (if I decide to go for 400+ bhp later on). At that power level + my built motor's rev limit of 7,400rpm (so a self-imposed limit of no more than c.7,000rpm), would you say that the under-bucket shims run a risk of flying out?!

If so, is there any kit out there that allows to run shimless on the STi 3/4 heads?!

 

Im pretty glad I made the orriginal post now after the quality of the responces made.

Thanks guys

Only questions that has not been answered though is:

1) what is a rough price on getting these clearences done?
2) what are the indidcations of these needing doing? (Symtoms)

Mainly because I need my car to have a proper inspection e.g. see if these need doing,timing belt and tensioners replacing,all fluids changed gauges fitted. and advice on any other things that need doing as I had no service history.

To be honest the car has been awesome since I have had it and I thouroughly respect it I always warm her up and cool down properly

Once again a big thanks for your input on the situation