Cylinder head bolt rubbery coating

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Cylinder head bolt rubbery coating

23 Jan 2015 14:21
#659484
Hey guys.. what the heck is this? I got the new stainless steel bolt package from Z1 to replace all the old gnarly looking screws with nice new allen heads. I replaced a couple of the cylinder head bolts and one came out with a clear rubbery looking sleeve. I wanted to check what you guys thought this was and if I needed to add some kind of coating to these bolts. You can see in the picture that it starts at the threads and runs up the shaft about an inch in total. I've seen recommendations for using loctite blue and/or permatext high temp thread sealant. Is this correct?
'78 KZ650 SR
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  • GUTS
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Re: Cylinder head bolt rubbery coating

23 Jan 2015 15:10
#659486
Looks like they put high temp silicone under the cap nuts. I just replaced the ones on my Z1 and they have copper washers under them not silicone.

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 15:32
#659488
It looks like a previous owner never should have been allowed to own a wrench! It should not be there. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Re: Cylinder head bolt rubbery coating

23 Jan 2015 15:41
#659491
Lol! Thanks Ed. So the correct treatment is blue loctite or is it the high temp thread sealant from Permatex which specifically states it's for head bolts? You can see it here if you're not sure what I'm talking about.
'78 KZ650 SR
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Re: Cylinder head bolt rubbery coating

23 Jan 2015 15:48 - 23 Jan 2015 15:50
#659493
No. You should not use anything at all on the head bolts. Take a look at the torque table in your Kawasaki Service Manual. You will notice t does not call for any sealant or thread lock. Do you have the correct washers? Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 23 Jan 2015 15:50 by 650ed.

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 16:11
#659495
SS flat washers?
'78 KZ650 SR
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Re: Cylinder head bolt rubbery coating

23 Jan 2015 17:00
#659498
I think they are usually copper.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 17:57
#659507
Are these the 14mm hex cap nuts we're talking about? If so, no Lock Tight, copper washers. Don't use sealent on any threads anywhere. Good way to strip or bust a case by hydro-static pressure.
Steve

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Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 17:58
#659508
Oh ok, just regular copper crush washers
'78 KZ650 SR
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Wear a helmet, pants are optional.

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 17:58
#659509
gcphoto wrote: Hey guys.. what the heck is this? I got the new stainless steel bolt package from Z1 to replace all the old gnarly looking screws with nice new allen heads. I replaced a couple of the cylinder head bolts and one came out with a clear rubbery looking sleeve. I wanted to check what you guys thought this was and if I needed to add some kind of coating to these bolts. You can see in the picture that it starts at the threads and runs up the shaft about an inch in total. I've seen recommendations for using loctite blue and/or permatext high temp thread sealant. Is this correct?

That's scary. :ohmy:
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Re: Cylinder head bolt rubbery coating

23 Jan 2015 18:03
#659511
These are the bolts right at the top of the cylinder head cover under the gas tank.
'78 KZ650 SR
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Re: Cylinder head bolt rubbery coating

23 Jan 2015 18:31 - 23 Jan 2015 18:32
#659515
OK. If you are talking about the fasteners shown as #1 and #11 in the diagram those are not head bolts. Those are cylinder head cover (valve cover) bolts. They do not use washers since they are flanged, and they do not use any sealant, thread lock, or anything else. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 23 Jan 2015 18:32 by 650ed.

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