Cam-/crankshaft installation ... lost alignment

[StephenB]

I have again looked at everything more with more emphasis on marks.

When the crankshaft is at OT (OT showing in lower half of timing hole), the keyway is at 9 o'clock. There is definitely no mark on the crankshaft sprocket, but with the flywheel correctly installed it doesn't need one.

The camshaft sprocket actually has a mark (it is faint so I didn't see it before) which lines up with keyway which is now at 12 o'clock.

Seems this is how it's supposed to come together.

[chasbmw]

I can send you instructions on how set up the camshaft/crank relationship on a triumph t110 if this helps? I think that the principles are the same?

[StephenB]

I'd love to read that, Charles. You should have my email address, no?

[chasbmw]

Stephen, I will scan and send sometime today

[dwire]

Stephen, I think everyone else had provided most of the obvious answers and looks like you are on your way. I'd like to ask since I have never had a bottom end off of a bike, is this where you are at with this and would that be the reason you don't just assemble the engine and use a degree wheel and dial indicator or many of the other (many less involved) methods for the alignment - so that the bottom end can be missing all of these parts to get it back in/on the bike?

I am sure I am not asking the question in a very good manner, but... Well, so is the engine on the bike or on a bench; perhaps that is all I'd need ask? Only inquiring as one day my engine will be out; I'm doubtful I'll run into this, but you never know. Thanks in advance as I'm merely curious.

[StephenB]

dwire,

This isn't a hypothetical question: the short block is indeed on the bench awaiting further assembly. It has only crankshaft, camshaft, their sprockets, the oil pump/cover and the flywheel assembled, no camchain as of yet. So yes, I need to assemble the engine and for obvious reasons want to get it right the first time. It seems the keyways are the give away.

Stephen

[John Falconer]

Are you running the 60/5 cam, a 308 cam, or a 336 cam?

Has the flywheel been properly installed and does it remain unmodified?

Do you have a dial indicator?

If you are running the double-row chain the marks on the sprockets can be EXTREMELY difficult to see. Have you used a VERY bright light and hand lens to look for them?

[StephenB]

Are you running the 60/5 cam, a 308 cam, or a 336 cam?

Has the flywheel been properly installed and does it remain unmodified?

Do you have a dial indicator?

If you are running the double-row chain the marks on the sprockets can be EXTREMELY difficult to see. Have you used a VERY bright light and hand lens to look for them?

I am using the stock R60/5 cam
Flywheel assembly: I guess so (work was done by Boxerworks Services)
yes: double row sprocket (will follow your "bright light" advice)
No, don't have a dial indicator on hand.

[twist]

Stphen, when I replaced my chain, I noticed timing marks at the back of the cam sprocket. Why in the back I can't begin to say.