Unfortunately, Vicky, my previous, beloved E12 had her oil pump die about nine
months after Dave purchased the car from me. The oil pressure gauge was flat
reading zero pressure and the idiot light for the oil pressure was on as well according to Dave.
Due to the complexity of replacing the oil pump on an E12, Dave elected to go
all the way and do the 3.5l motor conversion to the car!
Whoohoo, lots more go-power!
The following are the comments from Dave midway through the engine replacement:
The bottom end looked fine as did the top. The
valve seals absolutely crumbled when removed. That was
the cause of the oil consumption. I did a
compression test of the engine before it was pulled.
One, two, three, four, and six were all at 170 psi.
Number five read 152. I haven't pulled that
piston, but I suspect a problem there. No matter.
That block will not be retained. It will go to the mechanic
to offset some of the parts cost. The original cam will
be used for now. It is in good condition - just needs a
light polish.
The clutch was shot. Still had a little life in it,
but it was getting very close to the rivets. The replacement is for an E23
or E28. Much stouter looking unit. The slave looks OK too. The
condition of the water pump, alternator, and starter were
all taken into account. Only the starter needs replaced.
The bottom end on the 3.5L is being worked over.
My mechanic has 28 years on these things and has the tools to get it done right.
Same guy that did my 3.3L in my other E12. I'm hands on through the whole thing so it
isn't like I'm just hiring it out. I'm using his shop and his knowledge
extensively. This is a marvelous learning experience. The 'might as well'
monster has reared its ugly (and expensive) head. I have about $1100 in
parts already and still have to buy a main bearing set. The rings looked
and checked OK (as did the mains), but I don't want to do this again so they
get replaced too. Given the cost of all these things, I won't be doing any
fancy head work for a while. It will live with L-Jet and the stock 528i
cam for now. Perhaps a port, polish, and 282 cam in the future. I'll be
waiting a while on paint as it is.
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3.5l crank
3.5l block
Empty engine bay 1
Empty engine bay 2
Old and new clutch
Tranny exposed
Old Block/Oil Pump 1
Old Block/Oil Pump 2
Old Block/Oil Pump 3
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