Audi Forum - View Single Post - Audi 80 Valve Stem Seals

dougless · 09-06-2007, 11:48 AM

Hi

It is possible to do this on some engines with the heads still attached to the block, ie without removing the head providing you have a way of pressurising the cylinder whilst the valves are closed.

The two methods I know of are:

EITHER Remove spark plugs and rotate engine till it is at bdc on cylinder 1. Then use a compressor used for air tools and attach an air line to where spark plug was and pressurise the cylinder. Remove collets etc and replace seal. On to the next cylinder etc.

OR with cylinder at bdc, feed a clean piece of skipping rope into the spark plug hole, a fair amount needs to go in BUT make sure a bit is still sticking out! Turn engine over to tdc for that cylinder, or as far as it will go. The valves should be nicely trapped by the compressed rope and collets etc can be removed and the vale stem seal dealt with. Replace bits and pieces, turn engine back to bdc and remove rope. Repeat for other cylinders.

I have not seen this done on an Audi 80 but on an old 1300 polo and I see no reason why it should not work on other fairly simple 8 valve engines.

Good luck

09-06-2007, 11:48 AM	#6 (permalink)
dougless Newbie Join Date: Sep 2007 Posts: 2 Gallery: (0)	Hi It is possible to do this on some engines with the heads still attached to the block, ie without removing the head providing you have a way of pressurising the cylinder whilst the valves are closed. The two methods I know of are: EITHER Remove spark plugs and rotate engine till it is at bdc on cylinder 1. Then use a compressor used for air tools and attach an air line to where spark plug was and pressurise the cylinder. Remove collets etc and replace seal. On to the next cylinder etc. OR with cylinder at bdc, feed a clean piece of skipping rope into the spark plug hole, a fair amount needs to go in BUT make sure a bit is still sticking out! Turn engine over to tdc for that cylinder, or as far as it will go. The valves should be nicely trapped by the compressed rope and collets etc can be removed and the vale stem seal dealt with. Replace bits and pieces, turn engine back to bdc and remove rope. Repeat for other cylinders. I have not seen this done on an Audi 80 but on an old 1300 polo and I see no reason why it should not work on other fairly simple 8 valve engines. Good luck Last edited by dougless : 09-07-2007 at 08:25 AM.