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Crankshaft timing

J

Joel 841 Diesel

New User
I am rebuilding a 1958 Ford 841 172ci diesel. I have the crankshaft and pistons in. I noticed that when I roll the engine over (by hand) that the timing marks line up on the crankshaft/cam gears when #1 cylinder is on the exhaust stroke top dead center. It seems to me that if I would have rotated the crankshaft 1 revolution while installing the crankshaft that #1 cylinder would be on the compression stroke top dead center. Am I right? Won't this throw my injection pump timing off? Can I leave the crankshaft as is and compensate by rotating the injection pump drive by 180 degrees?
Thanks. Joel
 

You are overthinking this.

With the engine "open" line up the GEAR timing marks as they are supposed to be, moving on, button up the front cover and don't think of the GEAR timing marks any more, they've done their job.

When ready to install the injection pump verify #1 TDC at the end of the compression stroke by the fact that both valves on #1 are "loose" and set the marks on the flywheel to what the manual directs and install the I.P..


At this point, where the internal timing marks are is MEANINGLESS, and you can't see them anyway.
 
Makes sense. I do tend to overthink things. Just wanted to make sure before I finished putting it together. Thanks a lot for the quick response.
 
(quoted from post at 12:29:32 03/03/21) Makes sense. I do tend to overthink things. Just wanted to make sure before I finished putting it together. Thanks a lot for the quick response.
Click to expand...

The venerable "small block Chevy" is the same way.

Cam timing marks line up 360 crankshaft degrees from #1 TDC at the end of the compression stroke!
 
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