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Location: Minnesota
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Cam timing is complete, I think. HELP
This may go down as the dumbest question ever asked but I completed the cam timing per Wayne's book and the Bentley manual tonight and everthing seemed to work out fine.
My question is I took pictures before the engine was torn down and comparing the left/right sid cam sprockets the pins were only spaced about 3 holes apart from each other. Here's the pictures   I've been working long hours and am probably loosing it but now the pins are about 180 degrees apart (sorry no pictures). Shouldn't the pins be pretty close in spacing to where I took them apart after it's timed again? My cam timing procedure Set valve clearance #1 intake Turn to TDC set up dial indicator turn until I get the correct lift on dial (1.25mm) take out cam nut and pin turn to line up notch with case split reinsert pin and torque bolt turn over twice and check lift repeat for #4 Semmed pretty simple but the pictures got me thinking I messed up, I can't envision why the pins would have moved. Brian
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1987 911 Coupe-Current ride 2007 997TT-Sold 2006 997 C2S-Sold 1991 964 Turbo-Sold 1987 911 Targa-You never forget your first |
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02-14-2007, 08:06 PM
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it sounds like you did it right.
since there are more holes in the gear than dwells you'd have to put the gear back in the exact same orientation within the chain to be able to put the pin in the same dwell.
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big AL '77 911 |
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02-14-2007, 08:24 PM
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Just to confirm #1 and #4 are supposed to be 360 degrees apart?
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1987 911 Coupe-Current ride 2007 997TT-Sold 2006 997 C2S-Sold 1991 964 Turbo-Sold 1987 911 Targa-You never forget your first |
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02-14-2007, 08:44 PM
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Forced Induction Junkie
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360 degrees of crankshaft rotation? Yes.
btw, I didn't see a mention of preloading the chain tensioner sprocket during your procedure. This will help maintain consistency when timing 1 and 4.
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P Last edited by WERK I; 02-15-2007 at 08:26 AM.. |
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02-15-2007, 08:23 AM
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Location: Rio Rancho, New Mexico
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Brian the key here is #1 and #4 are 360 crankshaft degrees apart. You did that. Should be fine.
Nice pictures. The timing chains are near the end of their life. Nothing critical, but I would plan on replacement within the next year or so.
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red Last edited by 2.7RACER; 02-15-2007 at 08:43 AM.. |
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02-15-2007, 08:39 AM
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Thanks guys,
The chains in the pictures are the old ones before I started tearing them apart, I replaced them with new ones during the rebuild and the tensioners are no where near that extended. And yes I was talking about 360 degrees on the crank and the chains were loaded when I did the timing. I starting to get pumped up, another week or so and I hope to hear the sweet sound of success. Thanks guys Brian
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1987 911 Coupe-Current ride 2007 997TT-Sold 2006 997 C2S-Sold 1991 964 Turbo-Sold 1987 911 Targa-You never forget your first |
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02-15-2007, 12:59 PM
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Location: Rio Rancho, New Mexico
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Good Luck Brian,
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
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02-15-2007, 04:40 PM
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1985 Porsche 930 Fac. Slantnose 3.3l
