Bubblehead
Well Known Member
I've just installed new cylinders on my wide deck IO-360. I am checking dry valve lash and found TDC on the compression stroke on #1 cylinder, but I do not see a mark on the crank flange to get it precisely aligned at TDC. Can someone give me some guidance?
I would normally look on the starter gear assembly to find a TDC mark, but the prop and adapter and ring gear are off because I needed to replace the front crank seal.
Also, I noticed that my "LW-16471 SUPPORT ASSY., Starter ring gear" has TDC and 25 BTDC marks on the front and on the back but the marks are at different points! In other words, if the assy was mounted on the crank, the TDC mark on the front would position the crank differently than the TDC mark on the back! Is this normal? Which do I use? I marked it before removal with a match mark to the crank flange but I want to put it back together correctly, not just the same way it came apart!
Thanks,
John
I would normally look on the starter gear assembly to find a TDC mark, but the prop and adapter and ring gear are off because I needed to replace the front crank seal.
Also, I noticed that my "LW-16471 SUPPORT ASSY., Starter ring gear" has TDC and 25 BTDC marks on the front and on the back but the marks are at different points! In other words, if the assy was mounted on the crank, the TDC mark on the front would position the crank differently than the TDC mark on the back! Is this normal? Which do I use? I marked it before removal with a match mark to the crank flange but I want to put it back together correctly, not just the same way it came apart!
Thanks,
John