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Old 10-12-2013, 02:55 PM   #1
tomdubz OP
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Valve check nightmare

Ok everyone laugh at me. My nightmare came true. Forgot to put it top dead center and lock before proceeding to take the cam bridge off. Cams are out and I have no idea how to find TDC or how to put cams back correctly. Advice? Point me toward a thread?
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Old 10-12-2013, 03:04 PM   #2
Katoom72
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If the thing is close to TDC you should be able to lock the crank into place?

If not:

Put the other cilinder at TDC and turn the crankshaft 1 turn (so 365 degrees) + 75degrees (75 degrees is from the center of cilinder to the other) counterclockwise. Check in the opening of the locking bolt to see the crank is perfectly at TDC, if things are correct you can turn in the locking bolt in completely. Now the crankshaft is locked at the TDC of the other cilinder. Now put the cams in with the marking points level to the edge of the sealing surface of the head.

And no reason to laugh, atleast you're trying to fully tame the beast. Every knob can twist the throttle, twisting the wrench on the LC8 is a whole new adventure. Good luck and don't be afraid to ask!
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Old 10-12-2013, 03:15 PM   #3
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Thanks! The irony is this is my 5th time doing this. Haste makes waste.
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Old 10-12-2013, 03:53 PM   #4
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Put a wooden chopstick into the spark plug hole and cycle the pistons. When the chopstick is at TDC - you're good to go.
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Old 10-12-2013, 04:43 PM   #5
m800mm
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at least your throttle cable didn't get in your front cam and sheer off
like mine did today! I'm so F ing stupid shouldn't even have such a nice
bike
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Old 10-12-2013, 04:48 PM   #6
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The saga continues

Did katooms suggested and sure enough, the engine locked as it should. So I went to see if it would do it on the other cylinder that I hadn't messed with yet. 365 + 75 and the engine locked but the dots were nowhere near where they needed to be. I then unlocked the motor and tried turning it to see how far it was from TDC when it suddenly became impossible to turn. It backs out but there's a definite wall and I've got this nagging feeling of something being not right. Maybe I'm paranoid?
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Old 10-12-2013, 04:59 PM   #7
Gustavo.Ramos
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Someone correct me if i'm wrong on this one:

1st set rear cylinder on TDC:

Rotate the crankshaft till the rear piston is at top ( the chopstick tip is nice!). Verify on the rhs of the engine if the marker is aligned indicating TDC. Set the cams lobes facing in. Pay attention to the markers on the camshaft. Rear on the 950, is marked with an "X" on the inside that should be aligned with the engine head surface. If it is a 990, is a "o" marked on the outside of the gear.

2nd set front cylinder TDC

After doing this, unlock the cranskshaft, rotate ccw 360, plus 75 degrees. The engine heads refference is quite good as they are 75 degrees apart, so is easy to spot.

Verify again on the rhs if the crankshaft mark is visible. If so, lock it, and proceed to set the camshafts in place. for TDC in front, the cam lobes should be pointing out (away from each other), and the (950) "o" should be aligned with the engine head surface.

Bolt the cam bridges in cross pattern, first 10Nm for all bolts, then the larger allen ones for 18Nm.

This should get your engine back to timing.

From the HOW
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Old 10-12-2013, 05:05 PM   #8
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If you removed the bridge when the engine was not at TDC (ie. valve springs were loading it), then you might have damaged it - hopefully not.
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Old 10-12-2013, 05:19 PM   #9
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Thats because you are 440 degrees past the front cilinder, the methode i explained was for setting the front TDC with the rear cilinder TDC as 'starting point'. To go from the front TDC tot the rear you need to turn the crank 290 degrees, counterclockwise.

LC8 fires every other revolution of 720 degrees

About hitting that wall, is the sparkplug out?
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Old 10-12-2013, 05:52 PM   #10
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Ha! Well I should have specified, I messed up on the rear cylinder, not the front.
And no, spark plugs are still in.

Maybe I did some damage when removing the cam bridge without being TDC and locked.

Quote:
Originally Posted by Katoom72 View Post
Thats because you are 440 degrees past the front cilinder, the methode i explained was for setting the front TDC with the rear cilinder TDC as 'starting point'. To go from the front TDC tot the rear you need to turn the crank 290 degrees, counterclockwise.

LC8 fires every other revolution of 720 degrees

About hitting that wall, is the sparkplug out?
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Old 10-12-2013, 06:06 PM   #11
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And a full circle is 360:)
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Old 10-12-2013, 06:13 PM   #12
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Quote:
Originally Posted by tomdubz View Post
And a full circle is 360:)
Hmm tought i was still sober after those few beers....

Take the plugs out? :-)
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Old 10-12-2013, 06:31 PM   #13
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So, take plugs out and start from the beginning? As in, set front to TDC, rotate 285 counterclockwise then fix rear?
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Old 10-12-2013, 06:50 PM   #14
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Sirrus Querstion

Why can't you just turn the engine by hand and watch the valve(s) you're going to adjust open and close?

Then go a little more to be sure you're off the cam lobe.

Then check the clearance.

Isn't the only thing that matters is being off the lobe?

I know I'm wrong but don't know why.
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Old 10-12-2013, 08:43 PM   #15
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For checking clearances, yeah, it doesn't matter where the lobes are pointed as long as they are pointing up on whatever cam you're checking.
For pulling the bridge though, you want to make damn sure they both are off the buckets and locking the cylinder in it's spot achieves this, as well as keeping the motor from turning while the cams are out.

I've done this too and if you pull the plugs it should be easy enough to turn the motor and find TDC compression on the rear cylinder again.

DON'T turn it backwards if you can help it. I broke a cam chain guide doing this.
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