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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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 Posted: Tue Oct 30, 2007 10:59 pm Post subject: |
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| Mike924 wrote: | Thanks for the replies, Guys (...and JAF).
Not driving, Nobbi, just with the engine at idle speed, to take a look.
Thanks, Tigger: I'll give it a go!
Porchev and 924Guy: I set the clearances (with a feeler guage) a few months ago. I think I did it right, but I could have cocked up. And, for sure, I'll check with a feeler gauge again when I take the cover off, before starting her up!
Morghen, I have a stethoscope, such as you describe especially for motors. I used it on an earlier car and got such a fright from all the noises going on, I haven't dared use it again!  |
Hi Mike,
Not sure if you remember my tappet issues in the past (more than I year since I waved goodbye to the 24  ) but this sounds similar.
What I'd mention from my experiences is that the wear could easily be on the bucket and the buckets rotate and aren't nec uniform, so try checking your clearances again and as you check each one swivel the bucket around as you do... best of luck!
I have to confess, due to my prior problems with stripping threads on the dizzy drive housing I resorted to the BALS* method of repair
*Buy A Louder Stereo
Not proud of it, but never managed to fix it!
_________________
1998 BMW Z3 2.8 arctic silver & red
1981 168HP 931 S2 blue/tan leather - SOLD
1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Oct 31, 2007 12:17 am Post subject: |
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| seanski44 wrote: | | What I'd mention from my experiences is that the wear could easily be on the bucket and the buckets rotate and aren't nec uniform, so try checking your clearances again and as you check each one swivel the bucket around as you do... best of luck! |
I was thinking along those lines, Sean, beacuse the noise comes and goes, then comes back, then goes again; like the bucket's rotating.
Trouble is, when you adjust the clearance you need to rotate the bucket to the right place to get the Allen key in, so naturally that's the position you measure the gap...  Perhaps the thing to do is measure, rotate bucket by 90°, measure again and adjust for the average (or throw the bucket away if the difference is more than the tolerance range... )
I was kind of hoping to confirm the rotating bucket theory by watching them rotate and see when the noise is worst...  , but maybe the cross measurement idea is better...
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org
Last edited by Mike924 on Wed Oct 31, 2007 12:25 am; edited 1 time in total |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Oct 31, 2007 12:23 am Post subject: |
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| Jaf wrote: | Will have been just idle speed. By the time I got round to the front (10 secs) there was oil all over the place so I didn't stick around to look where it was coming from. Reckon it might have been bouncing off the cam lobes as it was coming out at all sorts of angles.
Are you going to give it a try? With cardboard and rag maybe like DOCO and Tigger suggest. |
What I think I'll do is cover the place with rags, leave the cam cover resting in place (with the nuts removed), start the engine and then just gently lift the cover, a bit at a time, until either it's all the way off or I think too much oil coming out, whichever happens first... 
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Oct 31, 2007 1:12 am Post subject: |
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Best grab one of these:
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- WeiBe (1987 924S 2.5t) - 931 S3
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Oct 31, 2007 1:13 am Post subject: |
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Oooh... I like the yellow one! 
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Wed Oct 31, 2007 6:07 pm Post subject: |
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| Mike924 wrote: | | seanski44 wrote: | | What I'd mention from my experiences is that the wear could easily be on the bucket and the buckets rotate and aren't nec uniform, so try checking your clearances again and as you check each one swivel the bucket around as you do... best of luck! |
I was thinking along those lines, Sean, beacuse the noise comes and goes, then comes back, then goes again; like the bucket's rotating.
Trouble is, when you adjust the clearance you need to rotate the bucket to the right place to get the Allen key in, so naturally that's the position you measure the gap... Perhaps the thing to do is measure, rotate bucket by 90°, measure again and adjust for the average (or throw the bucket away if the difference is more than the tolerance range... )
I was kind of hoping to confirm the rotating bucket theory by watching them rotate and see when the noise is worst... , but maybe the cross measurement idea is better... |
also, don't forget once you've identified the area at fault, you could try swapping the bucket with another cylinder's and see if the fault follows - would tell you if it were a cam prob or bucket prob. But I know that's a lot of work whipping the cam off!!
_________________
1998 BMW Z3 2.8 arctic silver & red
1981 168HP 931 S2 blue/tan leather - SOLD
1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Oct 31, 2007 6:37 pm Post subject: |
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Yeah, that's just it, Sean. I don't really want to remove the cam anymore than I have to. I know it's got to come off one more time to sort out the dodgy bucket, but I'd like to limit it to that, if at all possible.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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Tiny
Joined: 10 Apr 2006
Posts: 502
Location: London, UK
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| Posted: Wed Oct 31, 2007 9:10 pm Post subject: |
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Hi Mike,
Just another idea on this one. I read that you can easily identify a source of noise using a sound "cone."
Allow me to explain... Using a piece of fairly thick paper and peice of sticky tape, make a cone of about half a metre in length. For the tappet noise I'd make one end to have approx 4 inch diameter... and the other end for your ear approx 1 inch in diameter.
When you remove the cam cover and start up to idle, you can listen using the cone to your ear with greater directional accuracy for that noisy gap.
I have exactly the same noise on my car from one solitary tappet...and was thinking the bucket was spinning as the tap became more prominent on idle....so looking forward to you cracking this one! = ]
best of luck,
Tiny
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PORSCHEV
Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada
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| Posted: Wed Oct 31, 2007 10:37 pm Post subject: |
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I don't think your visually going to be able to "see" the troubled lifter..but if you must do this test why don't you plug the oiler tube with a piece of rubber hose with the other end clamped off?? That will limit alot of the oil.
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.
1978-#53 "D" track racer. |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Oct 31, 2007 11:25 pm Post subject: |
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You might well be right there, but at least I'll get some idea of what's going on. Not least to see if the oil tube is, in fact, lubricating every lobe.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Thu Nov 01, 2007 3:19 am Post subject: |
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yea...you wont actualy see anything. you need to warm up the engine and then remove the cover and inspect each tappet by moving the cam and pressing and lifting each tappet with your fingers. also you should check with a measuring tool. I'm going to do that to my car tomorow too. i have a weird sound too
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