| Author |
Message |
74 Thing
Samba Member
Joined: September 02, 2004
Posts: 7689
|
 Posted: Fri Mar 19, 2021 10:55 pm Post subject: 94mm cylinders, chip near case savers when decked |
 |
|
I have an engine case that is bored for 94mm cylinders and decked and the case is very thin near the case saver that there is a chip that goes down inside the case like in this photo:
https://www.thesamba.com/vw/forum/album_page.php?pic_id=1158326
Is there any tricks on sealing this up? I have used a process of deburring the spigot hole lip, cleaning really well with brake clean and acetone, and then using a sealant such as Motoseal and others, but I always encounter a leak.
I really do not want to take it totally down and have it decked completely again if it is not necessary.
Thanks in advance for any advise. |
|
| Back to top |
|
 |
madmike
Samba Member
Joined: July 11, 2005
Posts: 5302
Location: Atlanta,Michigan
|
| Posted: Sat Mar 20, 2021 4:55 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
I'd just use a dab more motoseal  
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
|
| Back to top |
|
|
Brian_e 
Samba Member
Joined: July 28, 2009
Posts: 4316
Location: Rapid City, South Dakota
|
| Posted: Sat Mar 20, 2021 6:41 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
I'd just use a dab more Ultra Black. 😁
Smear it over that spot with your finger and smash it in there good. It will be fine.
Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok
Narrowed beams, Drop adjustable spring plates, Bus disk brake and IRS kits.
www.type-emotorsports.com
Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts |
|
| Back to top |
|
|
raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23581
Location: Oklahoma City
|
| Posted: Sat Mar 20, 2021 6:49 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
| Brian_e wrote: |
I'd just use a dab more Ultra Black. 😁
Smear it over that spot with your finger and smash it in there good. It will be fine.
Brian |
^^^^^,this!
I love Motoseal. Many say Honda-bond or Yama-bond are better. They are all very similar chemically. But.....its not designed as a "filler". The Motoseal, H-bond and Y-bond are excellent for the cylinder to case joint in the respect that they are very high in solvent content and contain flow/wetting agents to allows them to flow out and wet out.
They are a combined gasket "dressing" and adhesive. But compared to most RTV....the solids to solvent ratio is too high for filling big gaps.
Any of the Permatex Ultra series is hard to beat for filling gaps. I would use motoseal for the gasket. Once it fully dries....pump Permatex into that gap. Make sure the area is oil free and ldt it cure fully.
Black is excellent. The gray is the hardest/highest durometer and color nearly matches Motoseal. Ray |
|
| Back to top |
|
|
mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23945
Location: SHALIMAR ,FLORIDA
|
| Posted: Sat Mar 20, 2021 8:54 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
| eye wood refrane from pumping it into that aera. just a little tad extra there and it should be fine. |
|
| Back to top |
|
|
raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23581
Location: Oklahoma City
|
| Posted: Sat Mar 20, 2021 12:15 pm Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
| mark tucker wrote: |
| eye wood refrane from pumping it into that aera. just a little tad extra there and it should be fine. |
Just a tururn of phrase.....I simply mean squeeze in squeeze in enough to fill the hole and then smooth it over. Don't just make a an outer shell by spreading it over the gap witj your finger.
You want a small amount of RTV on the inside and outside and in the gap. Think of it like an "I" beam shaped plug. If there is nothing on the inside for this plug.....to prevent it from going back through the gap.....case pressure can simply push it out.
Probably a ball of RTV ahout 1/8th inch in diameter would cover it.
Ray |
|
| Back to top |
|
|
stealth67vw
Samba Member
Joined: January 22, 2004
Posts: 1884
Location: Grass Pants, Orygun
|
| Posted: Sun Mar 21, 2021 9:07 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
The case should have been decked approximately. 060" when bored for 94s to give the cylinders a wider base to seal against.
If you assemble as is, I use Ultra Grey RTV.
_________________
John Bates
JB Machining Services
1967 street Bug 2276 w/ 48 IDAs, 2050lbs with driver
7.76 @ 89.55mph 1/8 mile
12.27 @ 109.56 mph 1/4 mile
https://youtube.com/shorts/GmifEu5QvnA?si=OIw8eM7QU3LMhtiz
https://www.tiktok.com/t/ZT68foYFS/ |
|
| Back to top |
|
|
nsracing
Samba Member
Joined: November 16, 2003
Posts: 9758
Location: NOVA
|
| Posted: Sun Mar 21, 2021 9:11 am Post subject: Re: 94mm cylinders, chip near case savers when decked |
|
|
It is a small blemish - RTV will seal that.
Goodness - |
|
| Back to top |
|
|
|
