[86RedCarerra]

Thanks for the replies everyone.

Pete- thanks for all the tips.

Cylinder studs-They are different top and bottom. The bottom are darker and not very magnetic, compared to the upper studs. I don’t have any corrosion anywhere on this engine- the studs look great. Are the less magnetic studs the Dilivar? I will replace the Dilivar studs.

Oil pressure- I only got to drive the car once, before I decided to drop the engine/trans due to timing chain noise. The Oil pressure light never came on at idle, and the press gauge never indicated less than ~1.2 bar at idle, when warm. Cruising, it was about ~1.5 bar above the Porsche min spec (I forget what that is at the moment, but I did check this on that one drive). Oil restrictors are not installed on the engine, either…. So perhaps the pump isn’t in bad shape. I plan to split the pump to have a really good look at it.

The case halves were not leaking anywhere along the flange seam…I had planned to have the case joining surfaces machined and then align-bored, but now you have me thinking this might not be necessary.

The aluminum IMS gear shows little wear and no damage whatsoever, but that doesn’t mean it’s not worn out. I had planned to replace that as well.

I am wary of replacing the timing chains without replacing all 6 sprockets, just based upon the presumed mileage on this engine. I have not found much information at all regarding how to inspect these sprockets. I know how chain sprockets wear, and when to replace my motorcycle sprockets, but this is different- all of the sprockets look nearly new and run in an enclosed oil bath. None of the typical sprocket wear or damage that I have seen pictures of. It would be nice to know if there is a method of measuring them for wear, but I don’t think a spec is given anywhere. If I had a new sprocket, it might be easier to compare against that.

The piston skirts appear to have normal wear, but I don’t have dimensions yet. I plan to take the pistons, cylinders, crank, cams and IMS shaft to a friend’s house where I can measure bores, journals and piston skirts. I have access to a flat machinist table, v-blocks and plenty of micrometers, but they are all in inches.

Has anyone posted an engine overhaul/blueprinting form for the 911 on the forum? I’m still searching for one- otherwise I’ll have to make a form.

Thanks again,

Dave

Cam housing bores are smooth, no scoring, just like the cam journals.