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Registered User
Join Date: Jul 2006
Location: S. Florida
Posts: 7,234
Remove the left side top rocker cover. If the intercooler is in the way remove it first.
When number one piston is at TDC on the compression stroke both valves will be closed and there should be right around .004" rocker arm elephant foot to valve stem clearance so you will be able to wiggle both rocker arms that tiny little bit.
You'll feel the .004" clearance and you may hear the faint clicking as you wiggle the rocker arms back and forth.
Old 02-13-2018, 08:53 AM
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quattrorunner's Avatar
Join Date: May 2006
Location: Las vegas
Posts: 5,727
Turbo powa!
1977 911s. it's cool
Old 02-13-2018, 10:56 AM
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I would rather be driving
jpnovak's Avatar
Join Date: Apr 2000
Location: Austin, TX
Posts: 7,322
And to add to what JFairman described... If the #1 piston is at overlap (meaning #4 is at TDC) the rockers will be tight due to spring tension.

Its pretty easy to tell if the rocker is "loose" indicating TDC or "tight" indicating cam overlap. If #1 is tight, rotate crank 360 deg and it should be loose.
Jamie - I can explain it to you. But I can not understand it for you.
71 911T SWT - Sun and Fun Mobile
72 911T project car. "Minne" - A tangy version of tangerine - EFI conversion parts
Old 02-13-2018, 12:30 PM
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Location: New Zealand
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If the rocker on #1 is slack - TDC on firing - as above. When you go another 180 deg you are on the cam timing stroke and the rocker should have depressed about 1-2mm. So, easy to tell if you take the cover off. If side 3-6 is easier to get at - less crap to remove - take that inlet cover off. When crank at TDC mark, if #4I is depressed 1-2mm, then #1 has to be on TDC firing/comp.
83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 02-13-2018, 05:19 PM
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