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Old 09-11-2017, 07:12 PM   #1
seymourj98
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1994 SC2
Default DOHC timing tips

I'm installing a new timing set on my DOHC, but I'm having some issues with tension. Both cam sprockets are in the right position with the drill bits through the alignment holes, with the black links lining up with the dot on the sprockets. The cam is set to TDC with the middle of the two black links at the 6 o'clock position on the cam sprocket. However, once the chain is lined up, the guides placed in position, and the drill bits removed, the exhaust cam rotates counter-clockwise just enough to cause slack between the two cam sprockets. The intake cam does not seem to move when removing the drill bit and tends to stay in position. Does anyone have any tricks to get everything lined up without slack?

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Old 09-11-2017, 07:45 PM   #2
OldNuc
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1998 SC2
Default Re: DOHC timing tips

Oil pressure fixes that without operator interference. It is not broke so do not try and fix it. If it looked like this pix it is fine. http://www.saturnfans.com/photos/sho...ming/cat/12963

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Old 09-11-2017, 08:20 PM   #3
seymourj98
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Default Re: DOHC timing tips

My concern is that at the top guide, it doesn't look like that. It's not tight against the guide. It droops considerably between the two cams, despite all of the marks on the chain lining up where they should.

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Old 09-11-2017, 08:38 PM   #4
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Default Re: DOHC timing tips

Did it look like this?
http://www.saturnfans.com/forums/att...chmentid=50739

From page 11 of my thread.
http://www.saturnfans.com/forums/sho...230898&page=11

That looks like what you are describing. We had no issues - motor runs great.

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Old 09-11-2017, 08:49 PM   #5
seymourj98
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Default Re: DOHC timing tips

That looks about right, thanks for calming my worries

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Old 09-11-2017, 10:29 PM   #6
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Default Re: DOHC timing tips

It's good idea to make two full revolutions, to verify nothing is binding up, double check all your marks, and that slack should be gone

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Old 09-12-2017, 07:13 AM   #7
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Default Re: DOHC timing tips

The slack will not pull out until there is oil pressure on the tensioner and once turned the marked links will not line up again unless you want to be cranking that engine for many complete revolutions. DO NOT EVER crank it counter clockwise either as it will jam the tensioner. A couple of turns for free motion is recommended though.

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Old 09-15-2017, 03:37 PM   #8
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Default Re: DOHC timing tips

That's correct^as far as marks. Forgot I went and made additional marks that would like up for that. Doh!

Nuc, can you help me understand that tensioner part you said. From my observations, it works in a ratchet style, not from oil pressure. Js.

Idk. Just saying two turns worked for me as far as slack goes.

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Old 09-15-2017, 04:16 PM   #9
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Default Re: DOHC timing tips

It is also oil pressure driven, that is why there is a small oil port behind it. The ratchet just keeps it from being completely retracted by any counterclockwise rotation of the crank such as a backfire. This feature can jam the shoe in place though.

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Old 09-15-2017, 04:23 PM   #10
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Default Re: DOHC timing tips

Interesting. Thanks.

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Old 09-18-2017, 11:38 AM   #11
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Default Re: DOHC timing tips

As stated, the slack is normal. If the chain is new it will be very tight once the tensioner is installed.

When you have everything else installed, the only way to install the tensioner is to remove the alignment bits for the cam sprockets. That little bit of slack you see is what allows the tensioner to be installed. The slack will disappear once the tensioner is installed. The intake sprocket should rotate counter-clockwise a bit while you install the tensioner, otherwise the bolts holes won't line up.

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