Confirming TDC?
Thread Starter
|
Freshman User
Joined: Sep 2014
Posts: 31
Likes: 1
Confirming TDC?
We have the heads off and confirmed top dead center of the #1 piston on the compression stroke by damper line in place, piston head flush with block and both lifters in their lowest position. This should be enough to confirm TDC of the #1 piston correct?
If so, this should also provide evidence that the crankshaft gear and the camshaft gear are aligned correct?
Thanks
If so, this should also provide evidence that the crankshaft gear and the camshaft gear are aligned correct?
Thanks
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
It confirms that the mark on the damper is lined up correctly, giving you TDC.
It also confirms that at the point you checked it you were at TDC on the compression stroke rather than the exhaust stroke.
It does not necessarily confirm that the cam and crank are lined up correctly. You could easily have the timing chain off a few teeth and still have both lifters at the lowest point. But it does confirm you aren't one crank rev off.
It also does not guarantee that every time your damper shows TDC that you'll be on the compression stroke. The damper is on the crank so if you were to turn the crank one full rev you'd be back at TDC but on the exhaust stroke that time.
It also confirms that at the point you checked it you were at TDC on the compression stroke rather than the exhaust stroke.
It does not necessarily confirm that the cam and crank are lined up correctly. You could easily have the timing chain off a few teeth and still have both lifters at the lowest point. But it does confirm you aren't one crank rev off.
It also does not guarantee that every time your damper shows TDC that you'll be on the compression stroke. The damper is on the crank so if you were to turn the crank one full rev you'd be back at TDC but on the exhaust stroke that time.
Thread
Thread Starter
Forum
Replies
Last Post
89er
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
10
Dec 1, 2017 09:30 AM
bsraborn
1973 - 1979 F-100 & Larger F-Series Trucks
6
Sep 5, 2016 07:36 PM
F500Mike
Y-Block V8 (239, 272, 292, 312, 317, 341, 368)
5
Mar 28, 2013 09:00 AM
Handegard
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
5
Jun 13, 2007 10:16 AM
