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Find TDC with no flywheel? (engine on stand)
I want to finish as much of the engine assembly as possible with the engine on the stand, but I would need to keep the engine at TDC to mount the camtower and belts
Is this possible or even advisable without mounting the flywheel?
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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06-09-2010, 11:39 AM
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Location: Atlanta, GA
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TDC on the short block is when 1 and 4 are at the top of their stroke. If the head it already bolted on you could put a dowl in the number one spark plug and make sure it is at the top of it's travel. Just don't turn the crank once the cam tower is mounted
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89 944 - Alpine white/blue, MSDS headers Last edited by JoshB; 06-10-2010 at 11:59 AM.. Reason: Clarification |
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06-09-2010, 12:26 PM
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Join Date: Nov 2004
Location: Alberta, Canada
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Is the oil pan on? A quick look will tell you if it isn't. Is the head on? Same deal. If you really want to be certain, mount the flywheel and a flywheel lock before going any further. You could also reference via the woodruff key slot in the crank nose - sorry but I can't recall where it points at TDC - anyone?
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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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06-10-2010, 05:57 AM
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Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
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What about the cam sprocket and balance shaft notches? I guess it depends on how much has been reassembled.
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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06-10-2010, 06:35 AM
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Yeah, but it reads as if the head's on but the cam isn't.
Also, the crank rear will be keyed for the flywheel - you can check orientation there, too. If the head's on and the cam isn't, all the valves will be closed so you may as well go ahead and build away, just leave the cam tower until LAST and reference from the flywheel once it's installed.
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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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06-10-2010, 09:21 AM
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Join Date: Mar 2008
Location: Chicagoland
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yea as long as the valves aren't being pushed into the combustion chamber by the cam, you're free to spin the crank however. but just make sure #1 is at TDC when the cambox goes on.
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06-10-2010, 09:33 AM
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It's all been apart except for the head.
I am mounting the cam tower with the cam so valves will open, that's why I need TDC. I would need to reference via the woodruff key or the flywheel key, I don't trust me with the "stick in the sylinder" method. I can never get the same reading twice.
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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06-10-2010, 11:59 AM
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See factory service manual there is a casting notch on block by speed and reference sensor area with bracket removed you will see a line cast in rear of engine block. With flywheel installed in a engine stand you can line up tdc marks on block and flywheel that is tdc. No guessing there is also a line scribed on the crankshaft flange that you can eye ball to line with cast mark on block or use a staight edge. Flywheel on engine is more accurate. Regards tom
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06-10-2010, 01:14 PM
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Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
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Mis-read the part about no cam tower on...duh!
Carry on.
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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06-11-2010, 04:50 AM
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