MA7008O

I am in the progress of fixing a leak as related on the following post (https://rennlist.com/forums/964-foru...th-a-leak.html)

Looking into Adrian’s 964 book I fund a caution mark that sais, referring to removing the lower gear, the following:

"Anyone familiar with removing and installing bolts that mount gears onto shafts would know the potential problems with this procedure"

I am not familiar with the potential risk and would like to know them.

Thanks.

Colin 90 C2

I don't remember too much of a problem; however, my car was on a lift.
The oil line can be loosened with a 36 mm oil line wrench, or an adjustable wrench.
The housing has a brace that gets loosened on the rear of the housing.
Once you get the secondary muffler off, you can access it pretty well.

dfinnegan

I believe the issue has to do with torquing the bolt that attaches the lower gear to the cam shaft. You do not want to impart the torque through to the shaft as you will be applying that load to the cam shaft drive train.

Instead, you'll want to hold the gear so that no torque is applied through the drive train.

Many folks have changed out this seal and have used a variety of methods to hold the gear while tightening the bolt.

The Shop Manual indicates that Special Tool 9236 should be used to hold the gear. I don't think there are too many people who have, or went to the trouble to obtain that tool.

MA7008O

Thanks for the inputs.

My car is also on a lift (what a wonderful gift from my parents....)

With respect to the warning, in fact it has to do with the torquing of the bolt on the lower gear. I was thinking on some way of holding the gear. The impact wrench does not even fit.

Only thing is that the warning kind of "scare me"

stevepaa

I think I made a fixtue (tool) to hold that sprocket while I torqued.

dfinnegan

I've read here that impact wrenches should only be used to remove fasteners; never to install them. A torque wrench should be used when fitting.

As for holding the gear, I've forgotten how I did it, but I think general consensus was to use something to hold one of the ribs of the gear against the housing.

A lift, eh. That *is* a fine gift!

mrmoots

Not ideal and may damage the threads, but the studs on the end of the second exhaust box bracket fit fine.

I ended up using the camsahft locking wrench I had with one of the studs punched out.