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3 votes

When switching off the engine, do the cam and crank shafts always come to rest in an initial...

No. An engine stops where it stops because it is random when you turn the ignition off, and therefore there is no set place for it to end up at.
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

TDC on DOHC but with cams removed

On a 4-stroke engine, when #1 is at TDC, it's at TDC. It doesn't matter at that point if the cam(s) are not connected. Once you align the cam timing mark(s), then you'll set which stroke you are on. …
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

Why don't valvetrains use an idler gear between the cam gears

Bottom line is: It's been done. Here's one for a small block Chevrolet engine: Just as you describe, there's an idler gear (well, maybe two) which keeps things in time. These gears are used mostl …
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

How to test timing chain/belt assembly before sealing engine closed?

The best way to test to see if your engine is timed correctly is to rotate the crank shaft through 720° of rotation then check your timing marks again. Since you (supposedly) have a non-interference m …
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

4 stroke valve timing diagram: if valves are open during TDC, wouldn't they hit the piston?

First, remember that we are talking about four different engine cycles here: Intake; Compression; Ignition/Combustion; Exhaust. Top dead center (TDC) happens between two of these cycles: between Compr …
Pᴀᴜʟsᴛᴇʀ2's user avatar