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find the oil leak and fix it in the car... will be much easier..... oil leaks doesn't mean the engine has problems... just means a seal went out. 162k on a 4age doesn't really mean much.
However, if you were to remove it..... here are some helpful hints:
remove the engine & trans as one unit.
leave the electrical harness on the engine, pull it off the ecu & molex connector (and push through firewall) from the rear trunk
remove the axles by unbolting them.... keep the inner shafts in the trans as you won't have a mess.
leave the shifter bracket & clutch slave cylinder attached to the transmission.... just undo the line where it connects to the body.... trust me, those 2 top bolts on the bracket/slave cylinder can take HOURS (not exaggerating) to line up properly.
if you have a spoiler, remove it.... makes life a bit easier
undo the front and rear mounts first.... then attach the hoist and remove the side to side mounts
yes, there are many steps I skipped... those aren't really 'tricks' to working on an aw11, though... just necessary steps.
If you're quick..... I was able to pull a running/driving (ie everything hooked up) 7age & trans from the car... transfer many parts from the 7a to a smallport 4age (the 4age was an assembled longblock engine with just head/block/ oil pan and cam timing gears installed, nothing else was on it...)... reattach the trans, bolt everything back up into the car and get it running..... all in all took about 8 or 9 hours of work until completion.
It's easier to install the engine & trans as one unit.... when pulling, they go down... when reinstalling, they come up. This will require a hoist & a jack (and stands you trust) that will get the car to where the rear bumper is about waist high
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