Bob Perkinson wrote:

Attached is a picture of the Center housing of an 87 13B that I have, as

you

can see the combustion o-ring housing is broken off.  Has anyone
successfully repaired the outer wall of the combustion O-ring housing?

Can

this even be repaired?

Bob Perkinson
RV9A

Common problem for that year engine. Yes somebody has repaired them
by brazing as I recall. I personally would not consider the repair safe
for aircraft use however. These housing are interchangeably from year
to year somewhat. I would get another end housing from an 89 or latter.
It think Mazda had a quality control problem or the design did not allow
enough excess meat for minor core shifts. They fixed this problem in later

years

by modifying the casting patterns I think.

Paul Lamar

"Brian D. Cain" wrote:

I've seen this a bunch of times on the front end plate of the 89-91 year
models.
Same exact place, the iron for the inner water jacket o-ring land just
disappears
into space...

B
__________________
Brian D. Cain -/- Grand Prairie, TX -/- bdc196@killspam.comcast.net
bdc@killspam.teamfc3s.org
BDC Motorsports - Performance Rx-7 13B Rebuilds, EFI tuning, etc.
MSN bdc196@killspam.hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
http://bdc.cyberosity.com -/- http://groups.yahoo.com/group/HaltechSupport

Silicone rubber expands with tremendous force if constrained. If the engine
is over hauled and these O-ring slots are not completely cleaned it could be caused
by the stock Mazda square section silicone rubber O-rings expanding.

Paul Lamar
 
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