Porsche 911 Timing Chain Housings
After assembling the heads and cam towers, the next major components to be added to the air-cooled flat-six sandwich were the timing chain housings.
I didn’t send these out since they didn’t require any specialized machining or measuring other than making sure all the sealing surfaces were flat and clean. I did the cleaning myself a while back but I went over the sealing surfaces one more time with scotchbrite pads and plastic razor blades to get all traces of crud off.
To prevent future leaks, I had to remove the old epoxy spots from the backsides where the chain ramp pins are pressed into the back of the housings. I used aircraft stripper on the old epoxy, then wiped with solvent and re-applied new epoxy.
While the glue dried I went to install the threaded spray bar plugs on the rear of the cam housings. The chains housings partially block them so that was the right time to take care of them. Like the crank and case threaded plugs, these were installed with green Loctite.
The last 2 chain ramps were popped onto their respective studs then the housings were final cleaned and ready to install.
Note: The left (1-3) chain ramp later had to be removed to get the chain installed correctly. I found this out after the fact when trying to get the chain through. I ended up popping it off, torquing all fasteners, then putting the chain ramp back on. No biggie.
Goo-ed up the right housing and gasket with 574.
Right housing on with all fasteners torqued.
Then the left housing (complete with the ramp removal, installation, torque, then ramp re-installation). No more dangly chains.
The valve rocker arms and timing chain idler arms with gears are out for rebuild. My original cams are getting reground for heavier breathing.
Next time we will take a look at those plus take care of some other tasks on the poor neglected car itself.