mike h wrote:

1990 turbo, inside exhaust scroll. Outside scroll looks 100%. No wheel

to

scroll contact.

Mike Harrington

What is the history of this engine Mike? Was stock boost used its entire
life
or did somebody jack up the boost at one time or another? It is rare to
hear
about a cracked 89-91 turbo. Now I will have to disassemble mine.

Any gotches when taking them apart?

Paul Lamar

Motor had 160K miles, ran lower than stock boost when I got it (~4PSI) due
to clogged precat. Heat & backpressure destroyed this housing, the exhaust
manifold, and a lot of wiring & plumbing in that area under the hood, and
bubbled the paint finish on the underside of the hood.

I ran higher boost (~8 PSI) for about the last 3 months of the engine's
life, but that is the stock figure. THis was, of course, without the precat
:)

I know you guys don't run cats, but if stealing a used motor from a car...

Couple points when dis-assembing turbo: Use impact gun for banjo bolts on
CHRA. 13mm wrench for housing to CHRA bolts, on very tight with loctite. 2
of the bolts press on the oil inlet shafts and help separate the housing and
CHRA as they are turned out.

Don't take the wheels off the CHRA unless you have a rebuild kit handy;
there is a Oring between the compressor plate and the bearing assembly that
tears or deforms when removing. But if you do, the exhaust wheel nut is a 12
point SAE size (not metric). The inlet wheel nut is a 10mm.

Other than that it's painfully easy.

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org