What constitutes a BAD hydraulic tappet (lifter) ????
 

Which group of lifters are bad?

All lifters measure 0.420" from the button to the top.

Group 1)

lifter is soft. I can push the button in with my thumb with using about 5 lbs of force.

If I pump up the lifter with oil it stiffens (real hard to push) up but as I push it with my thumb I am able to get oil to seep out of the hole and run down the lifter.

If the lifter sits on the bench after 2 minutes the oil leaks out of the hole and i am again able to push the button with my thumb using about 5 lbs of force


Group 2)

If I try to push on the button very hard with my thumb (about 50 lbs of force) I can get the button to depress just a little amount (1/5 the distance) and a little oil leaks out of the hole. Maybe 1/10 the amount of oil.

The lifter can sit on the bench for eternity and it doesn't go soft. It maintains a very stiff nature.


So which lifters are bad?
I need confirmation ASAP
Thanks in advance :)



Speedy:)

bump :)

I wrote a full explanation on how to properly test lifters. Do a search. Esentially you have to empty them. Dunk in a penitration oil and pump till no more oil comes out side hole, then pump empty. Should all feel the same. Submerge in a margerine container with 10w30 oil and pump till full. Should all have the same number of pumps ~ and go hard. Don't see this and it's bad.

is this it?

http://forums.pelicanparts.com/showthread.php?s=&threadid=199847&highlight=lifter s+lifter

I remember it being more detailed buy ? Anyway, that's all there ended up being to it. Test them from dry to filled. O, fill them before you put the head back on or you'll think the engine is blowing up from all the tappet noise.

I spoke with a 944 guru at Harpers Porsche in Knoxville TN and he said the lifters should NOT leak down and should maintain to be very stiff even after a week from sitting on a bench. If they leak out of the weep hole and go soft the lifter is bad and should be replaced. From what he said the lifter is the same part number as a 1985 Audi 5000. I will have to check it out for future reference.

There is no procedure to prepping the new lifter before it goes in the car. You just install it.

To bench test a lifter you are suppose to push on the button with a screwdriver and the button should not compress.


So according to this info Group 1 is the bad set.


Speedy:)

You don't have to soak new lifters before you put them in?

Look like 2 different animals...

Audi top...Porsche 944 bottom


dhttp://forums.pelicanparts.com/uploa...1181677115.jpg .

http://forums.pelicanparts.com/uploa...1181677181.jpg

Although they may look different I wonder if funtionality is the same.

Is the OD the same?

Is the button height the same?

Is the location of the oil hole the same?


Speedy:)

I asked him this question specifically and he said "no, there is no need to soak the lifters. Just make sure everything is clean including the oil galleries.


Speedy:)

OK. I wouldn't think that soaking them could hurt them. I am always on the safe side of things. I think I would still soak my new ones in oil for a few hours. :)

It looks like the other lifter is missing the groove around the outside. There is another current post about lifters. Check it out. They have a cross section diagram of the lifter.

Audi may have a lifter that is the same, but I don't think it's that one. Does VW have anything similar?

Group 2 are bad.

This is what I found out from a Porsche technician. The new lifters I just received from the dealership are indeed just like group 2 which would confirm to me that group 2 is the good set. I do have them soaking in oil right now until I get get them installed.

I can't wait to have my 944 back. Driving a Saturn which is down a cylinder sucks big time. The Saturn burnt a valve but still runs :)


Speedy:)