Triumphrat

fivehundo · 08-27-2007, 12:16 AM

Okay, this job has been a little troublesome (to say the least) and I think I've got my engine timed correctly. Can one of you guys verify that I have done this correctly? I just want to double check.

Also, I spun the engine (accidentally) with the camshafts out. Could my engine be off by a revolution? If it is, does that matter at all?

rickster · 08-27-2007, 12:38 AM

I haven't dug into mine yet so I can't tell you for sure, but it looks like typical timing mark nomenclature. Do you have a service manual to refer to? What kind of work were you doing to it?
Love the quote; who was/is Herger the Joyous?

HiDesert · 08-27-2007, 01:35 AM

The quote is from the movie The 13th Warrior, and pretty accurately expresses the viking opinion of fate.

As long as the crank is at TDC (or, I suppose, BDC) and the camshafts are properly positioned for that crank position, you should be fine.

fivehundo · 08-27-2007, 02:25 AM

Quote:

Originally Posted by rickster

I haven't dug into mine yet so I can't tell you for sure, but it looks like typical timing mark nomenclature. Do you have a service manual to refer to? What kind of work were you doing to it?
Love the quote; who was/is Herger the Joyous?

Yeah, I've looked at the manual. I was doing a valve job while I had the bike apart. Two of my valve clearances were out of spec...

The book says I'm good but I wanted to check with all the experts on here.

Yep, hidesert is right.

The book is better than the movie but I like the movie too. It's just too short.

02Daytona955i · 10-07-2007, 11:32 PM

Quote:

Originally Posted by fivehundo

Okay, this job has been a little troublesome (to say the least) and I think I've got my engine timed correctly. Can one of you guys verify that I have done this correctly? I just want to double check.

Also, I spun the engine (accidentally) with the camshafts out. Could my engine be off by a revolution? If it is, does that matter at all?

Let's see; a four-stroke completes one full cycle in 720 degrees, so, if you spun the crank 360 degrees, your compression stroke will now occur where where your exhaust stroke used to occur, or vise versa, right?

fivehundo · 10-09-2007, 08:10 PM

Quote:

Originally Posted by 02Daytona955i

Let's see; a four-stroke completes one full cycle in 720 degrees, so, if you spun the crank 360 degrees, your compression stroke will now occur where where your exhaust stroke used to occur, or vise versa, right?

See, that's what I was afraid of...

I had to re-time the valves anyway, so does that matter? Is TDC on the compression stroke the same as TDC on the exhuast stroke (so long as I change the valve timing) or is there some other considerations that I haven't thought about?

I'd think TDC would be TDC but maybe not...

Sprocketjockey · 10-10-2007, 04:03 AM

Can you check it the "old school" way?

Pull a plug and insert a piece of wire. Watch the valves as the piston comes up...if the valves are closed it's on compression stroke. If the exhaust valves are open, it's on exhaust.

The crank doesn't care if it's on compression or exhaust, the valves determine the stroke. But if the crank is one revolution off, will the crank sensor try to fire the plug at TDC exhaust instead of TDC compression?

fivehundo · 10-10-2007, 04:24 AM

Quote:

Originally Posted by Sprocketjockey

Can you check it the "old school" way?

Pull a plug and insert a piece of wire. Watch the valves as the piston comes up...if the valves are closed it's on compression stroke. If the exhaust valves are open, it's on exhaust.

The crank doesn't care if it's on compression or exhaust, the valves determine the stroke. But if the crank is one revolution off, will the crank sensor try to fire the plug at TDC exhaust instead of TDC compression?

Yeah, if it was a carburaeted engine, this wouldn't be a problem but with all of the sensors and stuff, I'm not sure...

Here is how I got into this mess: I was adjusting my valves and when I went to replace everything, the chain got hung up on one of the teeth of the crank sprocket after I installed the tentioner and it jumped a tooth. I spun it around a few times to see if the timing was off, and it was.

I pulled everything off again and re-timed it. This time it stuck but the fact that I could be off by 1 revolution concerned me. What's the worst that could happen? It will either not run or at the very least, not run well... (right?)

Sprocketjockey · 10-10-2007, 12:44 PM

As long as you're SURE it's timed right, you don't have to worry about the pistons banging into the valves. I'm guessing it will either run right or not at all.

fivehundo · 10-10-2007, 01:51 PM

Quote:

Originally Posted by Sprocketjockey

As long as you're SURE it's timed right, you don't have to worry about the pistons banging into the valves. I'm guessing it will either run right or not at all.

Yeah, it turns free without obstruction. The timing appears to be correct but if it's off by 360 deg, I'm not sure if it will run or not...