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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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Wacky camshaft timing?
Both flywheel TDC marks are lined up perfectly and the flywheel is locked but the camshaft sprocket mark is exactly 180 degrees out from its mark. She runs perfect. Why is this? Is it possible for the 944 camshaft to be 180 degrees out? If it is 180 degrees out will the balance shaft timing need to be altered when installing the new belt?
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-08-2007, 08:36 AM
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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,279
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Rotate the engine one more time and the camshaft will be exactly on time.
It goes like this: The crankshaft rotates one revolution while the camshaft rotates half a revolution and the balance shafts rotate two revolutions.
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Good luck, George Beuselinck |
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01-08-2007, 11:00 AM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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I've already removed all the pulleys. Any ideas?
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-08-2007, 11:13 AM
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Registered
Join Date: Jul 2004
Location: Upstate New York
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Put the crankshaft in such a position that none of the pistons are near the top. Reinstall the camshaft pulley (with the key, etc.) and rotate the camshaft to the proper position.
Then rotate (by hand, of course) the camshaft to TDC on #1. If you sense any obstruction, rotate the crank in the opposite direction until you get TDC. The rest of the installation is left as an exercise...
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Good luck, George Beuselinck |
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01-08-2007, 11:17 AM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Or finish up what you're doing now, install the timing belt, tension with the twist method and rotate engine to TDC on the cam and check your timing on the crank. Your post did say the flywheel lock was on, no? If so, the postions of the cam and crank realative to each other won't change as long as you didn't move anything. Leave off the balance belt until after you've done the above.
As George says, then on with the exercise.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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01-08-2007, 11:23 AM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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Piece of cake George and Simon. The flywheel lock IS on and I marked the position of the camshaft sproket at 180 degrees out so I'll finish with the oil seals and water pump then use your method Simon.
Thanks again guys!
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-08-2007, 11:39 AM
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Registered
Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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... and it will be a lot easier if you pull those plugs before you rotate........ and using a long screwdriver on #1 makes it pretty straight forward when you set TDC.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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01-08-2007, 04:58 PM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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The lady still holds good compression and I’m going to replace the plugs anyway so plugs out and screw it Alex. Any way of knowing if #1 is exhaust or intake stroke?
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-09-2007, 04:22 AM
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Registered
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Put the rotor on the end of the camshaft and if the rotor is pointing to the number one plug wire, it's on the compression stroke because it's getting ready to fire that plug wire.
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Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually |
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01-09-2007, 05:02 AM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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You make it sound so simple Tom, and it really is, just a matter of putting the nogin to work. Thanks again. My nogin is nodding now. Went to University Avenue (Gainesville, Florida) last night for our version of Mardi-Grass. GO GATORS!!!!!!!!!!
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-09-2007, 05:41 AM
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Speaking of making things seem easy....they put on quite a show last night. Congrats. I was hoping the SEC would make a good showing. I don't know if Ohio State was having a bad game or Florida is just that good, but I guess it doesn't matter....they completely dominated.
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Tom 1990 944S2 Cabriolet 2002 Chevy Silverado 2500HD 2003 Maroon Ford F350 dually Last edited by Razorback1980; 01-09-2007 at 09:21 AM.. |
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01-09-2007, 09:13 AM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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"Strength of schedule, baby."
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-09-2007, 10:04 AM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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BTW, my daughter drew Albert (Gator mascot).
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Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-09-2007, 10:05 AM
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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,497
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HOLY SMOKES !!!
I didn't realize the balance shafts are rotating 12,400 RPM at redline !!
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Edek '87 924S '91 535i |
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01-09-2007, 06:00 PM
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Graduated User
Join Date: Aug 2006
Location: Florida
Posts: 268
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Yea, I guess your right Edik, or would it have something to do with the diameter of the crankshaft sproket?
__________________
Randy 1977 Scirocco Rebuilt 1.7L Stock Grey (Totaled) 1979 Scirocco Built 2.0L Stroaker Blue (Pilfered) 1979 Scirocco Built 1.8L Rust Bucket Tan (See ‘ya) 1982 Scirocco Rebuilt 1.7L Garage Kept Gold Daily Driver 1987 944 NA Rebuilding 2.5L One Female Owner Grey Weekender Cruising to a conkeytonk in my Scirocco on steroids |
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01-10-2007, 06:11 AM
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