Lifters replaced... still ticking
#32
Race Car
Join Date: Jul 2005
Location: San Jose Kalifornia Demokratische Republik
Posts: 3,916
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when the ticking stops is when you should worry
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#33
Three Wheelin'
Originally Posted by Drifter
From a previous experience, not on a Porsche, a ticking sound that appeared to be a lifter/valve ended up being an unexpected cracked exhaust manifold.
Also, somebody had a good point as well when they pointed out that all aircooled engines are noisy---this is true. There are no water jackets to muffle all the clatter going on inside, which I like! Porsche tried to make the old aircooled engine a bit more refined for the 964/993 series, with the quieter cooling fans and sound trays on both (also to meet noise regs) and the hydraulic lifters on the 993 (also for easier maintainance). But a bad lifter on a 993 will make a pretty audible ticking sound which is not normal. We have only done the lifters on a few 993s since I've worked at my shop, and each time it fixed the problem. It is a good idea to check rocker arms and valve guides while you're in there replacing lifters.
---
Chris Andropoulos
Schneider Autohaus
Santa Barbara, CA
#34
Rennlist Member
Yes, three different lengths. Before you order new lifters, you should see what part number your current lifters are, if you get wrong ones, that's (most likely) the reason tapping noise continues.
Part numbers for lifters:
-993-105-141-05 "regular" length
-993-105-141-51 (0.5mm shorter)
-993-105-141-61 (1.0mm shorter)
Part numbers for lifters:
-993-105-141-05 "regular" length
-993-105-141-51 (0.5mm shorter)
-993-105-141-61 (1.0mm shorter)
Also, when buying new lifters, how do you confirm which ones you got, other than the part number on the packaging, which could have been labelled incorrectly.
Actual lifter lengths which Porsche does not list in PET or the Repair Manual would be more useful.
The only data I came up with from a Euro site is a length of 25.8 mm for the standard lifter.
#35
Pro
I don't mean to scare the crap out of you but last time my engine started ticking the well known valve guides had been identified as the root cause for the noise. It really is the worst case but still a possibility...
#36
Rennlist Member
Another RLer got me asking the question after he installed new lifters.
So how do you know what length lifters are installed? -0.5 mm and -1.0 mm is relative.