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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
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-11-2007, 06:20 PM
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bump
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-12-2007, 08:24 AM
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Location: Ontario, Canada
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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.
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87 924S 107k (miles) yellow 1969 Firebird Coupe (Full frame off restoration.) 98 BMW 740i 2020 Subaru Outback and 2019 Crostrek. |
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06-12-2007, 09:55 AM
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-12-2007, 10:04 AM
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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.
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87 924S 107k (miles) yellow 1969 Firebird Coupe (Full frame off restoration.) 98 BMW 740i 2020 Subaru Outback and 2019 Crostrek. |
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06-12-2007, 10:21 AM
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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
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-12-2007, 12:22 PM
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Location: Buffalo, NY
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You don't have to soak new lifters before you put them in?
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-12-2007, 12:30 PM
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Certified Rennwerker
Join Date: Oct 2002
Location: Kansas
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Look like 2 different animals...
Audi top...Porsche 944 bottom d  .
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PCA " I've been everywhere, done everything......just can't remember any of it!" 
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06-12-2007, 12:40 PM
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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
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-12-2007, 01:52 PM
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Quote:
Speedy
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-12-2007, 01:54 PM
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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?
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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06-12-2007, 01:58 PM
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Group 2 are bad.
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87 924S 107k (miles) yellow 1969 Firebird Coupe (Full frame off restoration.) 98 BMW 740i 2020 Subaru Outback and 2019 Crostrek. |
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06-21-2007, 07:32 AM
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Quote:
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
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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06-21-2007, 12:02 PM
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