First Valve Adjustment - Doubt Creeping In - BMW Luxury Touring Community
 
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post #1 of 9 Old Sep 9th, 2013, 10:27 pm Thread Starter
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First Valve Adjustment - Doubt Creeping In

Some of you know that I broke a stud bolt while tightening a nut on a bearing cap in an attempt to put the camshafts back on and complete my first ever valve adjustment. I'm waiting for a new stud to arrive by mail so I can get on with the project and finish.

Tonight, I had a terrible thought. Do I know for sure that I set the engine at ninety degrees BEFORE top dead center? What I know is that the piston is at the midway point between its high point and low point. But I do not recall specifically that I turned the engine to first have the piston bottom out and then brought it to the halfway point. That leaves a 50% chance that I messed up.

So I don't know for a fact that it's set before top dead center or after top dead center (I guess that's what it's called.)

Current status: two camshafts are off and the chain is zip tied to the sprockets (two zip ties per sprocket.)

How can I verify that the engine is set before TDC before I go and reinstall the camshafts?

If it weren't for the hard way, I wouldn't learn anything at all.

-Richard S.
2000 K1200LT Champagne
2004 R1150RT Silver

Last edited by howles; Sep 9th, 2013 at 10:40 pm.
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post #2 of 9 Old Sep 9th, 2013, 10:40 pm
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Re: First Valve Adjustment - Doubt Creeping In

as long as you did not turn the engine over AFTER removing cams all should be OK, does not matter where the pistons are unless you removed the chain, turned over the motor and now have to do engine timing - bolt the pulleys on - put the tranny in 5th, roll the engine over thru a few revolutions and as long as nothing touches you will be good to start

Gary
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post #3 of 9 Old Sep 9th, 2013, 10:43 pm Thread Starter
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Re: First Valve Adjustment - Doubt Creeping In

Gary, thanks. I'm starting to breathe again. But why then if it doesn't matter, is it recommended to set the piston in the first cylinder to 90 degrees before TDC?

Just asking to learn something from this.

-Richard S.
2000 K1200LT Champagne
2004 R1150RT Silver
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post #4 of 9 Old Sep 9th, 2013, 11:10 pm
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Re: First Valve Adjustment - Doubt Creeping In

Before or after it matters not, half way the pistons is what you desire. Keeps them from hitting valves as you rotate the cam shafts to line them up with the cable tied cam gears. You will be fine.

John
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post #5 of 9 Old Sep 10th, 2013, 1:14 am
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Re: First Valve Adjustment - Doubt Creeping In

Curious - is there a (bolt on) guide around the crankshaft sprocket that prevents the cam chain from jumping a/any teeth ? I assume that is the arrangement because otherwise a complete re-timing of the cam shafts would obviously required and cable tying the sprockets would be pointless or at least not foolproof. Picture or fische anyone ?

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post #6 of 9 Old Sep 10th, 2013, 8:13 am
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Re: First Valve Adjustment - Doubt Creeping In

The chain retention around the crankshaft pulley is cast into the timing cover if I remember correctly.

Quote:
Originally Posted by K100Dennis
Curious - is there a (bolt on) guide around the crankshaft sprocket that prevents the cam chain from jumping a/any teeth ? I assume that is the arrangement because otherwise a complete re-timing of the cam shafts would obviously required and cable tying the sprockets would be pointless or at least not foolproof. Picture or fische anyone ?

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post #7 of 9 Old Sep 10th, 2013, 8:13 am Thread Starter
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Re: First Valve Adjustment - Doubt Creeping In

Quote:
Originally Posted by K100Dennis
Curious - is there a (bolt on) guide around the crankshaft sprocket that prevents the cam chain from jumping a/any teeth ? I assume that is the arrangement because otherwise a complete re-timing of the cam shafts would obviously required and cable tying the sprockets would be pointless or at least not foolproof. Picture or fische anyone ?
Dennis, I'm not sure what you're referring to as a bolt on guide. I trust this photo explains.
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-Richard S.
2000 K1200LT Champagne
2004 R1150RT Silver
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post #8 of 9 Old Sep 10th, 2013, 8:24 am Thread Starter
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Re: First Valve Adjustment - Doubt Creeping In

Quote:
Originally Posted by howles
Dennis, I'm not sure what you're referring to as a bolt on guide. I trust this photo explains.
Dennis, cancel that. I didn't understand your question at first. This photo won't explain. I trust that David Shealey's explanation will.

-Richard S.
2000 K1200LT Champagne
2004 R1150RT Silver
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post #9 of 9 Old Sep 10th, 2013, 11:56 am
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Re: First Valve Adjustment - Doubt Creeping In

Quote:
Originally Posted by howles
Gary, thanks. I'm starting to breathe again. But why then if it doesn't matter, is it recommended to set the piston in the first cylinder to 90 degrees before TDC?

Just asking to learn something from this.
what John is saying best to follow but when you are putting cams back on you need to slowly snug the caps down evenly until they seat, maybe been lucky never had any issues putting cams back on any of my gas or diesel engines ever, think it would be pretty rare for a motor to stop with a piston at top dead center

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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