Leak found in cases...

Mastermax

Mastermax

Location
Flagstaff
Hey all,

I was doing a leak down test today after installing some new crank seals. I noticed the pressure would drop pretty fast so I knew I had a leak somewhere post installation.

Found this spot with a soap/water spray.

20220215_192752.jpg
Motor is an ET1107 These are 62t cases that have been ported and have a disaster plate on the bottom. I believe this area was epoxy re-enforcenent when the cases were done?

Anyway, what do you guys suggest for repairing this leak. Can I prep and clean this surface and lay some epoxy or jb weld into here? Any suggestions welcomed.
 
MikeMcDermid

MikeMcDermid

Location
CA
I know a few guys that have had this issue. They removed it all, cleaned it up well and re-filled it with Devcon. Not sure how safe the JB weld would be there. Imagine some more guys will chime in

Sent from my SM-N981W using Tapatalk
 
Jr.

Jr.

Standing Tall
Staff member
Site Supporter
Location
Hot-Lanta
This happens when the cases are not prepared properly before the epoxy is poured.
more times than not when used cases are used initally.
as stated, they can be repaired. All old epoxy needs to be ground out, then bead blasted to remove all impurities.
Devcon alumonized epoxy is the type preferred To use. If you feel you dont want to handle the repair yourself?
PM me detailed photos for a quote.

thanks, Paul
 
Wetbuffalo

Wetbuffalo

Location
New York
For what it’s worth. I’ve seen motors where people have painted ultra black or Honda bond on the crack. Yes it’s ugly but it works.

As noted preparation plays a large into preventing the failure. I also feel that temperature changes can contribute to it too. Most motors that I have seen in NY with epoxied cases have developed this leak, especially if they have done the trip to Daytona.

Im trying out a new product on my TPE 964 cases now. Hopefully it held up to the freeze thaw cycle of the trip to Daytona along with oil contamination.
 
Mastermax

Mastermax

Location
Flagstaff
Wetbuffalo said:
For what it’s worth. I’ve seen motors where people have painted ultra black or Honda bond on the crack. Yes it’s ugly but it works.

As noted preparation plays a large into preventing the failure. I also feel that temperature changes can contribute to it too. Most motors that I have seen in NY with epoxied cases have developed this leak, especially if they have done the trip to Daytona.

Im trying out a new product on my TPE 964 cases now. Hopefully it held up to the freeze thaw cycle of the trip to Daytona along with oil contamination.
Click to expand...
For visibility. I live in northern Arizona. I ride in 50 degree water and during storage it gets down to 10 degree air temp.

I also ride in havasu where air temp is in the 100's.

Your initial theory where this occurs on big temperature swings fits my story.
 
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