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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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 Posted: Tue Jul 11, 2006 1:06 am Post subject: |
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Amazing. It broke of so cleanly! Right across the no. 4 exhaust(?) oil hole.
Looks like something's been clouting it; presumably after the end broke off...
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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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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Tue Jul 11, 2006 1:16 am Post subject: |
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| Mike924 wrote: | Amazing. It broke of so cleanly! Right across the no. 4 exhaust(?) oil hole.
Looks like something's been clouting it; presumably after the end broke off... |
yeah, looks like it fractured about where the inlet spray hole is and then the bit that broke off must have got a whack from the cam lobe...
anyway, bored of that project, now taking speedo to bits... 
_________________
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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John Brown
Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA
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| Posted: Tue Jul 11, 2006 4:06 am Post subject: |
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The evidence of the picture might seem to indicate the tube was bent when installed. You can see the remaining end is bent down and the bit broken off was being hit by the cam lobe.
Is it possible the subsequent lack of direct lubrication has caused excess wear on the cam lobe and thence the bucket? For that matter, what condition are all the lobes and buckets?
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82 |
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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Tue Jul 11, 2006 4:10 am Post subject: |
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| John Brown wrote: | The evidence of the picture might seem to indicate the tube was bent when installed. You can see the remaining end is bent down and the bit broken off was being hit by the cam lobe.
Is it possible the subsequent lack of direct lubrication has caused excess wear on the cam lobe and thence the bucket? For that matter, what condition are all the lobes and buckets? |
er, I guess, time's muddying my memory, but I believe that the problem was there from the off (a year ago), and the several times I'd opened her up to atttempt to fix her since the oil spray tube was OK. - I may have some pics though which prove I'm talking nonsense, will check!
_________________
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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Benji0301
Joined: 18 Sep 2005
Posts: 66
Location: UK
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| Posted: Tue Jul 11, 2006 4:26 am Post subject: |
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Sean,
I know you have one of Jon Mitchells heads fitted on the car. Has the problem been there since the mod? Only reason I ask is I am hoping to get one of these heads and spoke to Jon about the work involved. Just checking something didn't get dropped or spattered into No4 exhaust during the mod.
Dale |
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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Tue Jul 11, 2006 7:20 pm Post subject: |
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| Benji0301 wrote: | Sean,
I know you have one of Jon Mitchells heads fitted on the car. Has the problem been there since the mod? Only reason I ask is I am hoping to get one of these heads and spoke to Jon about the work involved. Just checking something didn't get dropped or spattered into No4 exhaust during the mod.
Dale |
the tappet problem has been there since I got the head back. I doubt anything has been dropped in, more likely a mistake was made with the tappet order. It is also possible that the problem was there before as I had sent an unknown head to Jon for the mod as my existing head was not a suitable candidate. Maybe you could ask Jon about the specifics of my head. I had thought about returning my car to Jon to have the problem looked at, but he's rather a long way from here!
_________________
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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Porscheaddiction
Joined: 03 Nov 2002
Posts: 431
Location: Cornwall, Ont, Canada
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| Posted: Wed Jul 12, 2006 1:20 am Post subject: |
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You do know you must turn the adjuster 1 complete 360dg turn before it changes the clearance right ?
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1981 924 NA (Restoring mode)
1984 928S (Enjoying the driving season) |
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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Wed Jul 12, 2006 2:01 am Post subject: |
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| Porscheaddiction wrote: | | You do know you must turn the adjuster 1 complete 360dg turn before it changes the clearance right ? |
yes, cheers - I have removed the 1 notch that was in there and put in a 3 notch, I also have a 4 notch, but didn't think it worth putting it in - remember I can get a .8 feeler guage in there. Will I get another .4 from the next adjuster up?
_________________
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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numbbers
Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado
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| Posted: Wed Jul 12, 2006 9:51 am Post subject: |
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Well, with your oil pipe broken, you probably flattened off your cam lobes. That would account for your cam followers not adjusting properly. You may need a new cam, and possibly followers. Used cams are cheap, followers are expensive.
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1980 924 Turbo |
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seanski44
Joined: 13 Mar 2006
Posts: 532
Location: Nottingham UK
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| Posted: Wed Jul 12, 2006 7:29 pm Post subject: |
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| numbbers wrote: | | Well, with your oil pipe broken, you probably flattened off your cam lobes. That would account for your cam followers not adjusting properly. You may need a new cam, and possibly followers. Used cams are cheap, followers are expensive. |
no, sorry but I can't buy that, this is the second cam shaft and the problem was there from start up after cam change. the problem is not when the lobes are pushing on the tappet, the problem is when its TDC, so I can't see how a lack of friction on the tappet would cause the cam lobe to flatten. Does that make sense?
EDIT: also, oil pipe wasn't always broken, this is new.
_________________
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 Jul 12, 2006 8:32 pm Post subject: |
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Sean, I think what numbbers meant is that some damage to the cam lobes might have been done after the pipe broke and the end was being continually clouted by the cam. There is some evidence of this in your photo of the broken end.
My feeling is, judging from the photograph, that any wear on the cam lobe caused by this will be extremely minimal.
_________________
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 Jul 12, 2006 8:52 pm Post subject: |
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| Mike924 wrote: | Sean, I think what numbbers meant is that some damage to the cam lobes might have been done after the pipe broke and the end was being continually clouted by the cam. There is some evidence of this in your photo of the broken end.
My feeling is, judging from the photograph, that any wear on the cam lobe caused by this will be extremely minimal. |
yeah, I agree.
The main fault, I think we've worked out, is something that was there already though - he seemed to boil the whole prob down to the oil pipe.
anyway I've just had a completion date on my house, so all of this goes majorly on hold! - even had to whack the speedo back in without any fix (seems to work for the mo but it won't be long before it stops again!)
its packing time for me...
_________________
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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