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Message
Ooooooh, ... Aaaaaaaah,
My sincere condolences. That's one of
the worst "oil outs" I've seen. From the looks of it, the
centre and rear hsgs are "thow-aways". I'd say that if you look
carefully, you will find at least one, maybe more cracks on the
centre housing, and at least one in the rear housing as
well.
I'm surprised that the front rotor is OK. I
would have expected the front side of the centre housing to have copped a bit of
a hiding as well. The front housing itself will be fine, because the
coolant passages go almost down to the gear flange, and anyway, the
front hsg always runs cooler than the back housing as it's copping cold water
from the rad. Can we have some pix of the front side please?? As you
say, the rotor bearing looks fine.
You will notice how the main damage on the
back side of the centre housing is limited to where the oil cools the
face. Further out, you have the water gallery to keep things
cool. So when the oil stops flowing, the centre part gets hot,
and buckles like a belleville washer and grabs to rotor.
I've attached a pix of a centre housing and a rear
hsg split in half so everybody can see where the water gallery ends and
where the oil cooled part starts. One of the other issues, on
the 6 port at least, is the EGR passage. The pix are of an
'86-'88 6 port centre and rear housings, but the turbo housings
are quite similar.
I'd say that the rear rotor is also beyond
salvage, especially the way the side seals have been swaged into the
grooves. Nasty!! Being so fine, they would be a bitch to get
out, and then the groove would be almost impossible to dress
accurately. Additionally, the raised land inside the oil control
rings looks like it has taken a terrible pizzling as well. It is meant to
be proud of the main rotor side face by about 4 - 6 thou. Same goes for
the gear side.
Cheers buddy,
Leon
----- Original Message -----
Sent: Monday, January 10, 2005 1:36
PM
Subject: [FlyRotary] engine
disassembled
Greetings,
I took the engine apart
today, and here are some pics of the damage I found.
The front rotor, and
associated side housings look fine, and both rotor housings are fine.
The rear side of the rear
rotor is fine, but the front side of the rear rotor is ugly (see pic).
As bad as it looks, you can't really feel any worn spots, so I'm thinking it
will be OK assuming I can get the seals out. You can't tell from the
pics, but the side seals are mashed into the rotor in the center of the seals,
where the discolored part of the rotor is. The ends of the side seals
are free.
The rear side of the
intermediate housing is fairly well scored, but perhaps this can be machined
(lapped?) and renitrided. I'll ask Bruce about this tomorrow.
The rear housing is also
damaged, but not quite as badly as the intermediate
housing. It will still have to be repaired or replaced
though.
I don't recall the
criteria for bearing damage, but just looking at them, they all look fine to
me. I'll have to watch the tape again to see what I'm supposed to be
looking for.
The oil pump chain has
1/2" of slop, which Bruce's tape says is bad. Hard to imagine wearing
this out in as few hours as this engine has.
While I'm in here, I'd
like to make the porting a bit more aggressive for some extra power (need an
edge on Tracy). Suggestions accepted, particularly from Lynn, and
Leon. This is Bruce's porting job, which I believe he said was basically
the Racing Beat street port. I'll also drill the foot
of the rear rotor housing for an oil return for the redrive. Who
knows what else I'll do while inside :-)
Cheers,
Rusty (I guess I'm
committed to a rebuild now)
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