Timing chain swop

[Toby burnham]

Just fitted a new timing chain kit to a 1098. All good chain pulleys lined up with shims on the crank and timing marks lined up . Turned engine over distributor firing on no1 and valves on 1and 4 rocking. Is itcright that the pully timing marks are now 180

[Bill_qaz]

Many previous posts if you search.
Timing marks are number 4 firing tdc
External timing marks are number 1 tdc firing.
If the internal gear marks are inline when you fitted the chain don't worry about it.

[olonas]

As Bill writes re no. 4 on t.d.c. firing stroke.
I recently changed mine and queried this.
I had changed it years ago but without the distributor cap removed.
It was only because, after removing the distributor cap, I noticed the rotor arm was at cyl. 4 with the dots aligned.

[Bill_qaz]

When fitting distributor drive the manual says number 4 firing when internal marks cam to crank are aligned, although it mentions external tdc mark being on top which later was at bottom of timing chain cover.

Screenshot_20241031-122740_Microsoft 365 (Office).jpg (43.85 KiB) Viewed 754 times

So valve timing is set number 4 firing not number 1 which is for ignition timing