 Cylinder/case seal. |
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| Keith914 |
 Jan 4 2017, 11:26 AM
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#1
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Member  Group: Members Posts: 248 Joined: 29-April 16 From: Laguna Beach, California 92651 Member No.: 19,948 Region Association: Southern California  |
My recently rebuilt Type IV is leaking oil between the cylinders and the case. This engine is now a 2.4 L (was 1.7) with no gaskets or shims between the cylinders and the case -- common practice. So what is the best sealant and best method of application?
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| McMark |
Jan 4 2017, 11:29 AM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I use Loctite 518 there. Applied with an acid brush. If it squeezes out the sides, you used WAY too much.
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| colingreene |
Jan 4 2017, 11:56 AM
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#3
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Senior Member Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
that^
that said i know fat uses 1211 |
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| injunmort |
Jan 4 2017, 12:25 PM
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#4
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Senior Member Group: Members Posts: 1,024 Joined: 12-April 10 From: sugarloaf ny Member No.: 11,604 Region Association: North East States |
hylamar blue
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| iankarr |
Jan 4 2017, 03:23 PM
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#5
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,472 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region 
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old tried and true permatex aviation. Jake uses it in his video, but that was admittedly a long time ago (IMG:style_emoticons/default/wink.gif).
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| IronHillRestorations |
Jan 4 2017, 07:35 PM
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#6
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I. I. R. C. Group: Members Posts: 6,717 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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I used the lower cylinder sealing rings on the few type IV's I've built. Could be the sealing surface of the case has dropped a little, I could see where sealant would be beneficial.
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| Mark Henry |
Jan 5 2017, 11:43 AM
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#7
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(Perry Kiehl @ Jan 4 2017, 08:35 PM)  Could be the sealing surface of the case has dropped a little... Every engine I build I now see the deck out .002-.005. These are 40+ year old cases (IMG:style_emoticons/default/shades.gif) |
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| forrestkhaag |
Jan 5 2017, 03:14 PM
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#8
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Senior Member Group: Members Posts: 935 Joined: 21-April 14 From: Scottsdale, Arizona Member No.: 17,273 Region Association: Southwest Region |
Yamabond 4 is my engine-builder pal's choice and notes that in his race experience, it holds up in cylinder to case applications that see 10K rpms regularly. This goo is a silicone based liquid gasket that fills gaps on a flange surface and prevents leaks. When cured, this product forms a rubber-like body that resists heat and seals joints subjected to high temperature. It is gear and engine oil resistant, Yamabond 4 Motorsports sets in 60 minutes so you have time to work with it if chasing rings etc.
(IMG:style_emoticons/default/beerchug.gif) Attached thumbnail(s) 
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| Keith914 |
Jan 5 2017, 05:36 PM
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#9
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Member Group: Members Posts: 248 Joined: 29-April 16 From: Laguna Beach, California 92651 Member No.: 19,948 Region Association: Southern California |
Thanks for all the advice. Yamabond it will be (IMG:style_emoticons/default/beerchug.gif)
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| Mark Henry |
Jan 6 2017, 01:20 PM
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#10
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(forrestkhaag @ Jan 5 2017, 04:14 PM) Yamabond 4 is my engine-builder pal's choice Yamabond 4 is the same thing as Threebond 1215, might be 1211, both of which are RTV. |
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