Valve timing/Cam Question!
06-13-2002, 12:42 AM
#16
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Thanks Crackhead! i'm taking it apart tommorow, sooo if you wouldn't mind checking!
thanks for checking that out euro! <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />
thanks for checking that out euro! <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />
06-13-2002, 01:21 AM
#17
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If you need more input, you might want to try posting on the '944 & 944S2' board or the '968' board. Those guys with the small valves sometimes like to hang out there.
06-13-2002, 02:11 AM
#18
Racer
The Cranecams website has an articule on how to degree a cam,you'll need some special tools,i got my complete kit from Summit for around $90
06-13-2002, 01:59 PM
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OK, I just did two things wrong. Did I just get John D. and myself in trouble? I can delete and email them to you Jay. And I know now you have to scroll left-right. Sorry.
Oh yeah, and the marks that i was thinking of are bumps on the cam shaft itself, but those are for installing the timing chain and cams. The "lug cast nuts" should be at twelve o'clock when the engine is at 45 degrees before ignition TDC(cylinder 1).
Mark
'88 944S
Oh yeah, and the marks that i was thinking of are bumps on the cam shaft itself, but those are for installing the timing chain and cams. The "lug cast nuts" should be at twelve o'clock when the engine is at 45 degrees before ignition TDC(cylinder 1).
Mark
'88 944S
06-13-2002, 02:12 PM
#21
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Funny you should ask....From todays 944S2 E-mail Forum Digest:
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: "Michael Stephenson" <MStephen@LittleArch.com>
Date: Wed, 12 Jun 2002 08:48:49 -0400
X-Message-Number: 1
About replacing the chain - can it be done without removing the cams?=20
If not, then chain replacement looks like a job for a shop with the proper tools. A quick look at the shop manual indicates that the cams have to be set rather precisely using special tools.
Has anybody out there replaced the chain themselves? If so, what was involved?
Thanks.
Michael Stephenson
1989 944S2
Digest Mode
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: Peter Jan <peter_euro@yahoo.com>
Date: Wed, 12 Jun 2002 08:10:52 -0700 (PDT)
X-Message-Number: 2
Definitively not a do it yourself procedure... I
forgot how many hours in the book but I think it is
between 6.5 and 8... I had it done and it took long
time, with the adjustment taking almost as long as the
actual removal of the cams... I am pretty sure that no
special tools were required but just a filler gauge...
but then it has been over 2 years and I may be
forgetting something... If this is a normal
preventive measure, then it is an expensive one, then
again, since I drive about 1000 miles a year, I do not
think I will ever have to do it again...
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: "Mueller, Robert CDR" <RMueller@grumobile.uscg.mil>
Date: Wed, 12 Jun 2002 10:13:25 -0500
X-Message-Number: 3
Anybody have any thoughts on the adjustment procedure? I'm kind of short of quality mechanics who know anything about Porsche's down here. I've done a couple of 356/912 engine rebuilds in the past, but this adjustment thought makes me nervous. At over 150k, I'm probably about due for a chain with my next belt job next year and am thinking about it.
Bob
'90 S2 Cab
'74 MG Midget
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &- Porsche World article
From: James Webb <jw944@usa.net>
Date: Wed, 12 Jun 2002 15:10:59 -0400
X-Message-Number: 4
>Anybody have any thoughts on the adjustment procedure? I'm kind of
>short of
Could anyone explain what has to be adjusted? I did the tensioner pad, and to me, it looks like it's just a matter of keeping the cams on the right tooth relative to each other (and the crank). Not a job to do "on the sloppy," but I don't understand where even a feeler gauge comes in. Sorry for the ignorance! Please elaborate, someone! Thanks!
James
90 Glacier Blue Cabriolet
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World - article
From: Konrad Kelley <wingnutt@austin.rr.com>
Date: Wed, 12 Jun 2002 17:46:11 -0500
X-Message-Number: 5
It is fine-tuning the crankshaft-to-camshaft relationship, by adjusting the camshaft sprocket on the camshaft. Two dial indicators are used, one one the top of the #1 piston (thru the plug hole) and one on the top of the #1 hydralic tappet. Apparently, the goal is to have 0.75 mm of lift (for the 'S2) on the intake valves at the beginning of the intake stroke. I say apparently because the manual is not written/translated very well on this subject.
Konrad
'89 944S2
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World article
From: "George Beuselinck" <georgeb@944ecology.com>
Date: Wed, 12 Jun 2002 19:24:49 -0400
X-Message-Number: 6
And that's just to get the car in the ballpark to idle fairly well...
In order to fine tune the camshaft timing, one must be prepared to
vary the cam timing by a degree or two until the car pulls well at lower
rpms and also pulls well at higher rpms. This is an iterative process and can consume many hours of trial and error.
Good Luck!
George Beuselinck, mailto:georgeb@944ecology.com, Hudson Valley Region PCA, Rennlist Member 990719-1420 944 Ecology, Sellers of Guaranteed Used Porsche 944 Parts, MC/VISA/Discover PO Box 9, Ulster Park, NY 12487
Information/Ordering/Shop: (845)658-9593
<a href="http://www.944ecology.com" target="_blank">http://www.944ecology.com</a>
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World article
From: Peter Jan <peter_euro@yahoo.com>
Date: Wed, 12 Jun 2002 18:40:29 -0700 (PDT)
X-Message-Number: 8
Yep, I was right, I forgot that the dial indicators
were used (shoot me, I forgot since...) and I think
that they had to be "customized" to make them work...
Gosh, the nightmare is coming back...
Kinda funny though that the $15 part costs $500-600 to
replace and the tensioner at $140 takes only a few
minutes to change, I guess it all evens up...
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: "Michael Stephenson" <MStephen@LittleArch.com>
Date: Wed, 12 Jun 2002 08:48:49 -0400
X-Message-Number: 1
About replacing the chain - can it be done without removing the cams?=20
If not, then chain replacement looks like a job for a shop with the proper tools. A quick look at the shop manual indicates that the cams have to be set rather precisely using special tools.
Has anybody out there replaced the chain themselves? If so, what was involved?
Thanks.
Michael Stephenson
1989 944S2
Digest Mode
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: Peter Jan <peter_euro@yahoo.com>
Date: Wed, 12 Jun 2002 08:10:52 -0700 (PDT)
X-Message-Number: 2
Definitively not a do it yourself procedure... I
forgot how many hours in the book but I think it is
between 6.5 and 8... I had it done and it took long
time, with the adjustment taking almost as long as the
actual removal of the cams... I am pretty sure that no
special tools were required but just a filler gauge...
but then it has been over 2 years and I may be
forgetting something... If this is a normal
preventive measure, then it is an expensive one, then
again, since I drive about 1000 miles a year, I do not
think I will ever have to do it again...
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 & Porsche World article
From: "Mueller, Robert CDR" <RMueller@grumobile.uscg.mil>
Date: Wed, 12 Jun 2002 10:13:25 -0500
X-Message-Number: 3
Anybody have any thoughts on the adjustment procedure? I'm kind of short of quality mechanics who know anything about Porsche's down here. I've done a couple of 356/912 engine rebuilds in the past, but this adjustment thought makes me nervous. At over 150k, I'm probably about due for a chain with my next belt job next year and am thinking about it.
Bob
'90 S2 Cab
'74 MG Midget
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &- Porsche World article
From: James Webb <jw944@usa.net>
Date: Wed, 12 Jun 2002 15:10:59 -0400
X-Message-Number: 4
>Anybody have any thoughts on the adjustment procedure? I'm kind of
>short of
Could anyone explain what has to be adjusted? I did the tensioner pad, and to me, it looks like it's just a matter of keeping the cams on the right tooth relative to each other (and the crank). Not a job to do "on the sloppy," but I don't understand where even a feeler gauge comes in. Sorry for the ignorance! Please elaborate, someone! Thanks!
James
90 Glacier Blue Cabriolet
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World - article
From: Konrad Kelley <wingnutt@austin.rr.com>
Date: Wed, 12 Jun 2002 17:46:11 -0500
X-Message-Number: 5
It is fine-tuning the crankshaft-to-camshaft relationship, by adjusting the camshaft sprocket on the camshaft. Two dial indicators are used, one one the top of the #1 piston (thru the plug hole) and one on the top of the #1 hydralic tappet. Apparently, the goal is to have 0.75 mm of lift (for the 'S2) on the intake valves at the beginning of the intake stroke. I say apparently because the manual is not written/translated very well on this subject.
Konrad
'89 944S2
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World article
From: "George Beuselinck" <georgeb@944ecology.com>
Date: Wed, 12 Jun 2002 19:24:49 -0400
X-Message-Number: 6
And that's just to get the car in the ballpark to idle fairly well...
In order to fine tune the camshaft timing, one must be prepared to
vary the cam timing by a degree or two until the car pulls well at lower
rpms and also pulls well at higher rpms. This is an iterative process and can consume many hours of trial and error.
Good Luck!
George Beuselinck, mailto:georgeb@944ecology.com, Hudson Valley Region PCA, Rennlist Member 990719-1420 944 Ecology, Sellers of Guaranteed Used Porsche 944 Parts, MC/VISA/Discover PO Box 9, Ulster Park, NY 12487
Information/Ordering/Shop: (845)658-9593
<a href="http://www.944ecology.com" target="_blank">http://www.944ecology.com</a>
-----------------------------------------------
Subject: Re: S2 Chain Tensioner--points from the 911 &Porsche World article
From: Peter Jan <peter_euro@yahoo.com>
Date: Wed, 12 Jun 2002 18:40:29 -0700 (PDT)
X-Message-Number: 8
Yep, I was right, I forgot that the dial indicators
were used (shoot me, I forgot since...) and I think
that they had to be "customized" to make them work...
Gosh, the nightmare is coming back...
Kinda funny though that the $15 part costs $500-600 to
replace and the tensioner at $140 takes only a few
minutes to change, I guess it all evens up...
06-13-2002, 05:22 PM
#22
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Thanks Crackhead!(man your name is funny to type!?)
I can print that off, no need to e-mail me! that makes sense now, and mike that is some more great info, i'll keep you updated, just going to putter around the garage now!
I can print that off, no need to e-mail me! that makes sense now, and mike that is some more great info, i'll keep you updated, just going to putter around the garage now!
