"head stub bolt" or is it "head nut" - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 21 (permalink) Old Feb 28th, 2013, 5:02 pm Thread Starter
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"head stub bolt" or is it "head nut"

I'm putting my bike back together after removing the heads to do the valve clearance check. I have a question about putting the heads back on. In the engine torque settings it says to use Grease B (Molybdenum disulphide grease) on the bolts and on the head nuts to use Grease C (bearing/joint grease). Is this correct or am I reading the manual wrong?

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post #2 of 21 (permalink) Old Mar 1st, 2013, 2:45 pm
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I don't think it makes any difference. A bit of any grease should be fine to keep the threads from galling. It's a lot less work to adjust the valves without removing the heads !
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post #3 of 21 (permalink) Old Mar 1st, 2013, 4:51 pm Thread Starter
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It's a lot less work to adjust the valves without removing the heads !
I agree however being that this is the first time I have ever adjusted the valves I didn't realize that I had damaged the valve stem seals until after I adjusted every valve seal. The only way I was able to replace the seals was with the heads off.

Thanks for the reply.

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post #4 of 21 (permalink) Old Mar 1st, 2013, 9:47 pm
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I agree however being that this is the first time I have ever adjusted the valves I didn't realize that I had damaged the valve stem seals until after I adjusted every valve seal. The only way I was able to replace the seals was with the heads off.

Thanks for the reply.
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post #5 of 21 (permalink) Old Mar 2nd, 2013, 8:04 am Thread Starter
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Isn't it fun learning how to do stuff - as you do it?
To tell you the truth. I love it. Since I have the heads off it also gave me a chance to clean off the carbonization.

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Last edited by bandito40; Mar 2nd, 2013 at 10:25 am.
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post #6 of 21 (permalink) Old Mar 2nd, 2013, 9:55 am
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Be sure to lap the valve seats with valve lapping compound while you're in there.
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post #7 of 21 (permalink) Old Mar 2nd, 2013, 12:55 pm
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Does it make sense to replace the head studs while you've got them off on an 800SS? I know it's a no-brainer on a carbie SS if it had stock studs, but I'm curious if the stud issue was a problem on these later f.i. bikes. I, like many of us, have snapped head studs on our carbie bikes.

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post #8 of 21 (permalink) Old Mar 2nd, 2013, 2:20 pm Thread Starter
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Be sure to lap the valve seats with valve lapping compound while you're in there.
What do you mean by "lap the valve seats"?

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post #9 of 21 (permalink) Old Mar 2nd, 2013, 2:29 pm Thread Starter
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Did some surfing. I guess there are to ways. One is the regrind the seats and the other is to use a big clamp and press the valve into the seat. Is this the idea and which is the better (and cost effective way)?

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post #10 of 21 (permalink) Old Mar 2nd, 2013, 3:58 pm
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Lapping the Valves
This entails smearing valve grinding paste onto the valve contact area, and manually spinning the valve with a suction cup type tool so that the valve seat and valve grind against each other and very lightly removes any imperfections from the contact surfaces between the valve seat and valve. You can buy the paste and suction cup tool from any auto parts store. The paste is available in course and fine grades. This is a very easy job, just don't get carried away and be sure to clean the valve seat and valve sealing face when your finished.
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