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Old 02-02-2016, 07:16 AM   #1
Packard
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1995 SL1
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Default Timing chain when to and when not to move crank ?

Do you start with crank and cam assembled and turn crank to 12 oclock then start the procedure of dissassembly?
This youtube vid shows everything close to 12 apart here . and start with crank turn to 3 oclock then make small adjustments with cam to get it 12oclock and put the 3/16 drill bit in and turn crank once cam is adjusted . So dont u dissemble with crank at 12 then once everything is off u move the crank I was told to turn the crank with parts on this site.


How many degrees can i turn my cam after i have verified 90 degree crank placement?

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Old 02-02-2016, 07:24 AM   #2
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Default Re: Timing chain when to and when not to move crank ?

Quote:
Originally Posted by Packard View Post
Do you start with crank and cam assembled and turn crank to 12 oclock then start the procedure of dissassembly?
This youtube vid shows everything close to 12 apart here . and start with crank turn to 3 oclock then make small adjustments with cam to get it 12oclock and put the 3/16 drill bit in and turn crank once cam is adjusted . So dont u dissemble with crank at 12 then once everything is off u move the crank I was told to turn the crank with parts on this site.


How many degrees can i turn my cam after i have verified 90 degree crank placement?
If you have not taken it apart, I would just line it up at 12 noon, the key way points straight up on the crank. And the cam sprocket holes lining up with the holes in in the head. Cam sprocket slots next to central bolt hole will be pointing up. Then put in the drill or easier to use an allen wrench since it angles and will clear the frame. This way you wont be moving anything when you take off the old chain and put on the new chain.

The cams might want to spring back because of an opening valve, so there is in the middle of the cam those flats you put an adjustable wrench on it to turn it. So line cam up and put new sprocket on and secure with the drill or allen wrench in the sprocket hole.

The number 1 piston, one closest to fanbelts will be at TDC if you have the crank in right position.

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Old 02-02-2016, 12:24 PM   #3
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Default Re: Timing chain when to and when not to move crank ?

^^^Bad advice.
This is exactly how to INSTALL the timing chain and guides, http://www.differentracing.com/tech_...ochtchain.html

Before removing turn crank to 3:00 position after removing crank pulley bolt. Leave it at 3:00 position until ready to replace chain etc and verify the movable guide is free swinging BEFORE installing the new chain.

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Old 02-02-2016, 09:11 PM   #4
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Default Re: Timing chain when to and when not to move crank ?

Well, you better follow his advice since you're asking lots of questions about this, I can tell you do not have much experience changing such a chain.
What I could get away with several decades of engine experience, and I absolutely do have lots of time wrenching, and common sense, and at a chevy dealer, one of my first jobs, others probably will bend all their valves!
I am not kidding either, people just do dumb stuff. Like put it together, and crank it with the starter, not verifying manually the thing is actually lined up correctly. I give up, we have had enough. Remember to always color in between the lines.

turning to 3 o'clock, obviously lowers all the pistons enough away from the valves, you can turn the cam into the correct position with absolute safety. But you know, if the old chain is still on and it is already lined up, then it does not matter does it.

Last edited by sdowney717; 02-02-2016 at 09:19 PM..

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Old 02-02-2016, 10:05 PM   #5
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Default Re: Timing chain when to and when not to move crank ?

After pulling the cam sprocket the cam tends to roll under valve spring pressure to a neutral position, this bends at least 1 valve if at TDC. Shortcuts are for very experienced people only ...

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Old 02-03-2016, 03:45 AM   #6
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Default Re: Timing chain when to and when not to move crank ?

Quote:
Originally Posted by OldNuc View Post
After pulling the cam sprocket the cam tends to roll under valve spring pressure to a neutral position, this bends at least 1 valve if at TDC. Shortcuts are for very experienced people only ...
Very well said. I may be doing the timing chain on my '97 soon and i will keep this in mind. I have timing chain chatter, but am first trying to remedy with clean, synthetic oil. I'm hoping it's a stuck guide.

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Old 02-03-2016, 10:31 AM   #7
Packard
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Default Re: Timing chain when to and when not to move crank ?

Im asking if i leave all my old chain on and do the 3 oclock which turns both crank and cam .Then remove is that safe cause pistons will all be down right?
Then I remove chains and old stuff so i can start install my new cam crank and turn it now to 12 Is this going to be ok to do this way? How many degrees can i turn my cam after the crank is at 3 oclock . Would you say i can turn my cam clockwise like it says in directions ?How many degrees can the cam turn clockwise?

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Old 02-03-2016, 12:33 PM   #8
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Default Re: Timing chain when to and when not to move crank ?

With the crank 90 degress off TDC, that "3:00 position", you can spin either cam around endlessly, either direction, with no chance of hurting the valves.

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Old 02-04-2016, 03:06 PM   #9
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Default Re: Timing chain when to and when not to move crank ?

You've started five* threads about your timing chain.

Links have been added to at least one of those threads, that direct you to 'how to' threads/PDFs

A single thread is much more efficient

If you can't find a thread you started, just go to Search in the upper right hand corner, click on Advanced search, enter your user name, and search for "threads started by"

*edit: five threads this month, seven threads altogether
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Last edited by alordofchaos; 02-04-2016 at 03:13 PM..

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