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ekacpuc
Samba Member
Joined: December 08, 2010
Posts: 1414
Location: ketchikan alaska
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 Posted: Mon Mar 12, 2012 9:26 pm Post subject: couple engine assembly questions |
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First I read this guy is putting RTV at the bottom of the cyls where they meet the case. Should I do this? If yes is it on both sides of the gasket? The case has been decked for a good seal..
Do you guys lap where the cyls meet the head? Does it take very much?
So in order to check the rocker geometery I have to assemble most the motor then turn it over and such but... What about the fact that it's wiping my lifter lube off... Do I have to plan on measuring geometery then adjust then take the motor appart and relube the lifters?
Greg |
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66brm
Samba Member
Joined: January 25, 2010
Posts: 3676
Location: Perth Western Australia
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| Posted: Mon Mar 12, 2012 9:33 pm Post subject: |
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Rocker geomtry is done during the "mock up" phase of the build, where just a light coating of oil is applied. This is done before final assembly.
Lapping of the cylinders is a good idea to get a good seal, you won't need a gasket under the cylinders if you are using RTV to seal against the case.
_________________
Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
| modok wrote: |
| I am an expert at fitting things in holes, been doing it a long time |
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ekacpuc
Samba Member
Joined: December 08, 2010
Posts: 1414
Location: ketchikan alaska
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| Posted: Mon Mar 12, 2012 9:38 pm Post subject: |
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| 66brm wrote: |
Rocker geomtry is done during the "mock up" phase of the build, where just a light coating of oil is applied. This is done before final assembly.
Lapping of the cylinders is a good idea to get a good seal, you won't need a gasket under the cylinders if you are using RTV to seal against the case. |
Okay that's what i thought about the mock up.
So is it better to use RTV or the gasket? Not better to use both then huh?
One question I forgot to ask is about the cylinder studs... Can I reuse the 10mm ones? This will be going into a different case (for the 10mm) with new heads and stuff.. If I have to buy new ones does it matter what brand? I saw empi is alot less than bugpack and I think I saw some scat ones comparable in price to the empis.. but are they any good? empi scares me but ya never know.. |
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66brm
Samba Member
Joined: January 25, 2010
Posts: 3676
Location: Perth Western Australia
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| Posted: Mon Mar 12, 2012 9:44 pm Post subject: |
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RTV works well if used correctly, an even, thin smear on the surface to be sealed, you don't want excess sealant inside the case.
If they are original german headstuds then clean them up and use them, you know what they say about german quality. If it aint broke don't fix it. Be sure to reuse all the german thick washers for the case and heads also, those hardware kits are crap most of the time.
_________________
Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
| modok wrote: |
| I am an expert at fitting things in holes, been doing it a long time |
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ekacpuc
Samba Member
Joined: December 08, 2010
Posts: 1414
Location: ketchikan alaska
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| Posted: Mon Mar 12, 2012 10:00 pm Post subject: |
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| 66brm wrote: |
RTV works well if used correctly, an even, thin smear on the surface to be sealed, you don't want excess sealant inside the case.
If they are original german headstuds then clean them up and use them, you know what they say about german quality. If it aint broke don't fix it. Be sure to reuse all the german thick washers for the case and heads also, those hardware kits are crap most of the time. |
So a yayhoo like me may wanna just use the gasket... Nothing wrong with that?
I was hoping to use all my original hardware so good to hear. |
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66brm
Samba Member
Joined: January 25, 2010
Posts: 3676
Location: Perth Western Australia
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| Posted: Mon Mar 12, 2012 10:18 pm Post subject: |
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You can use the gaskets but they do tend to leak after a bit, I prefer going the sealant option
_________________
Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
| modok wrote: |
| I am an expert at fitting things in holes, been doing it a long time |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27678
Location: Colorado Springs
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| Posted: Mon Mar 12, 2012 10:42 pm Post subject: |
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the stock paper gaskets can squish out over time and cause problems
(often happens with vibration and dissimilar metals)
The cure for the last 40 years has been to not use any gasket between the cylinder and case, instead use a sealant. RTV silicone usually
I do not worry about the lube wiping off the cam, but I suppose that does happen. Worry about something else |
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x-file
Samba Member
Joined: March 11, 2012
Posts: 50
Location: Vic. Australia
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| Posted: Mon Mar 12, 2012 11:16 pm Post subject: |
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| It's hard to beat Loctite 518 sealant.You don't need anything else.Use a gasket if you need to adjust squish clearance. |
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ekacpuc
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Joined: December 08, 2010
Posts: 1414
Location: ketchikan alaska
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| Posted: Mon Mar 12, 2012 11:53 pm Post subject: |
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"I do not worry about the lube wiping off the cam, but I suppose that does happen. Worry about something else"
That's SILLY! Cams getting ruined happens ALOT seems like a good worry...
I'll use RTV
Thanks,
Greg |
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modok
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Joined: October 30, 2009
Posts: 27678
Location: Colorado Springs
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| Posted: Tue Mar 13, 2012 1:05 am Post subject: |
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| I really don't see how it would make any difference. |
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ekacpuc
Samba Member
Joined: December 08, 2010
Posts: 1414
Location: ketchikan alaska
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| Posted: Tue Mar 13, 2012 1:29 am Post subject: |
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| modok wrote: |
| I really don't see how it would make any difference. |
I really don't either... The darned thing spinds over when I prime the oil pump (unless I pull the pushrods)... It spins over when I start it to brake it in, if it was gonna wipe off I'd think it'd do it then.... So really I don't see why it would matter. Just wanted to know what other people do about it.
I'm talkin bout the lifters wiping off the lube on the cam lobes btw. I just worry because it wouldn't be fun AT ALL if I had to change the cam and lifters cause I burnt em up.
I do have to say there's a difference between someone who builds a motor and someone who assembles one. for example i'm not one of those guys who could just bolt something together and say "Gee I hope the valves don't hit the piston..", I gotta measure it and be certain.
Greg |
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