tore down another 12A
10-28-09, 07:29 PM
#1
tore down another 12A
tonight i decided it was past time to tear down the 12A that originally came in my ocean blue 85 GS which i converted to a 13B car, powered by the 13B from a GSL-SE. this engine was locked up when i brought the car home. i tried atf for days and gave up and pulled the engine. i saw the engine sitting on the garage floor tonight and decided to tear it down just to see what the issue was. it looks as if an apex seal let loose on the rear rotor and when it broke apart, it let the apex seal spring fly out and lodge itself between the rear rotor and the iron. it came apart nicely with only minimal fighting. the engine had 142K on the clock and was heavy on the carbon buildup. the rotor bearings look nice but the housings have some flaking and wear. i don't know that i would even attempt to reuse the #1 rotor housing. its in fair shape imo. the rear housing is trashed due to not only the flaking but due to the apex seal shredding itself in the housing. here are some of the pics i took of the engine internals:
rear iron:
#2 rotor housing:
#1 rotor housing:
intermediate iron:
rear iron:
#2 rotor housing:
#1 rotor housing:
intermediate iron:
Last edited by mazdaverx713b; 10-28-09 at 07:36 PM.
Trending Topics
10-29-09, 05:42 AM
#9
Stu, the e-shaft is actually the best part of the engine! definatly one worth using. my intentions are to clean the parts in the hot tank, spec the irons, coat and shelf the good parts, and sell the rest as decorative items for rotary fans.
11-05-09, 07:18 AM
#14
ok, i went out and took a few pics ths morning. i've been busy working and rebuilding the diff on my 80 LS and i got lazy with taking these pics. here are some of the pics of the parts that were hot tanked and cleaned:
bad housing and rotor:
bad housing and rotor:
11-05-09, 10:35 PM
#19
ok, here are some pics of the eccentric shaft and the front iron and stationary gear. none of these parts were hot tanked as of yet. the e-shaft was not hot tanked because i didnt want to take any chances of it rusting (will coat with light amount of oil after hot tanking). this is a very nice e-shaft and it, like the front iron, were only wiped down.
11-11-09, 08:45 AM
#20
here are some pics of my rotary powered cars and pics of the engines. good for comparison purposes and for those that aren't familiar with other rotaries.
my 1980 LS 12A:
my 1985 GS (with 13B):
85 GSL (12A) sold the car last year:
my 1980 LS 12A:
my 1985 GS (with 13B):
85 GSL (12A) sold the car last year:
11-11-09, 11:56 AM
#22
Senior Member
iTrader: (2)
Join Date: Nov 2005
Location: Richmond Hill, ON
Posts: 399
Likes: 0
Received 0 Likes
on
0 Posts
Since you drive both a 12A and a FI 13B SE - I'd be interested in hearing your thoughts on the difference in engine performance. I've only ever driven a 12A and will be doing the 13B SE transplant in the coming months (years?). I'm just wondering if it's a noticeable improvement.