More stuff!
Whilst I was waiting for other parts I got on with some other jobs on the car. Replaced the aircon O-rings at the bulkhead (again, this time with proper Porsche ones as I was worried the others might leak). I also fitted some rivnuts to attach the brake booster heat shield back securely. I followed this up by reinstalling the front bumper reinforcement with the powder coated brackets and new towing eye mount.
Interesting fact the threaded studs for the timing belt tensioner are identical to the exhaust manifold studs - part number 99906204402
Next interesting fact, make sure you remove the cylinder head oil check valve before sending your head for machining! My fault entirely, I wasn't sure how to remove it as the workshop manual is a bit vague and includes some instructions for updating older cylinder heads with the updated check valve from later models. It was easy to remove, the small M6 bolt in the side of the head is all that holds it in. Then a small knock with a punch and it dropped out. Unfortunately, these check valves are sealed and there is no way of servicing them. The one that came out of my replacement cylinder head appeared to be full of vapour blasting material, I cleaned it out with lots of brake cleaner but wasn't happy about reusing it (and didn't want to pay the Porsche premium tax of £470!!!). I removed the check valve from my original cylinder head which was in great condition (just a little oily). You can test them by blowing compressed air into the bottom and it should push the ball bearing inside the valve up. Replaced the o-ring on the outside and reinstalled into the head after cleaning out the oil channel. I believe this check-valve is to stop the head and valve train draining of oil when the engine isn't running (an attempt to keep the hydraulic tappets full of oil?).
Parts arrived from Porsche and I finally installed the lower compensating shaft bearing cover! I also had a helper in the garage, but she just wanted to sleep in the sun!
Finally I washed the cam tower housing and then reinstalled the camshaft, need to get the rear cover cerakoted to match the finish! (completely forgot about that). Not much more I can do at the moment until the head gasket arrives!
Whilst I was waiting for other parts I got on with some other jobs on the car. Replaced the aircon O-rings at the bulkhead (again, this time with proper Porsche ones as I was worried the others might leak). I also fitted some rivnuts to attach the brake booster heat shield back securely. I followed this up by reinstalling the front bumper reinforcement with the powder coated brackets and new towing eye mount.
Interesting fact the threaded studs for the timing belt tensioner are identical to the exhaust manifold studs - part number 99906204402
Next interesting fact, make sure you remove the cylinder head oil check valve before sending your head for machining! My fault entirely, I wasn't sure how to remove it as the workshop manual is a bit vague and includes some instructions for updating older cylinder heads with the updated check valve from later models. It was easy to remove, the small M6 bolt in the side of the head is all that holds it in. Then a small knock with a punch and it dropped out. Unfortunately, these check valves are sealed and there is no way of servicing them. The one that came out of my replacement cylinder head appeared to be full of vapour blasting material, I cleaned it out with lots of brake cleaner but wasn't happy about reusing it (and didn't want to pay the Porsche premium tax of £470!!!). I removed the check valve from my original cylinder head which was in great condition (just a little oily). You can test them by blowing compressed air into the bottom and it should push the ball bearing inside the valve up. Replaced the o-ring on the outside and reinstalled into the head after cleaning out the oil channel. I believe this check-valve is to stop the head and valve train draining of oil when the engine isn't running (an attempt to keep the hydraulic tappets full of oil?).
Parts arrived from Porsche and I finally installed the lower compensating shaft bearing cover! I also had a helper in the garage, but she just wanted to sleep in the sun!
Finally I washed the cam tower housing and then reinstalled the camshaft, need to get the rear cover cerakoted to match the finish! (completely forgot about that). Not much more I can do at the moment until the head gasket arrives!
