Hydraulic tappets and Run In 2.0 litre CU Type4
Posted: 01 Mar 2026, 19:19
Hello to all, this is my first post. I have an 1982 Aircooled T3, with no engine ATM. I have been following the excellent Sarran videos I found on youtube to undertake my overhaul of my 2.0 CU engine, I am an electrician and have not overhauled an engine before so I am learning alot.
I am at the stage of valve train, I have replaced the cam and I have new followers wrapped in greaseproof paper and covered in a protective gunk, which I cleaned off with brake cleaner. The book I have it states to hold pressure against a submerged lifter for 30 sec cycles to remove air and fill with oil. (bubbles of air do emerge but the end result is, not solid, still squishy).
I dont understand the preload of 1.5 or 2 turns, (surely done when lifter is solid? with air bled?)
If I set rocker adjustment screws at (just touching on comp stroke) for static timing, is that ok with new/ dry lifters?
When then do I set preload adjustment when new cam requires 20min engine running to burnish lobes?
Oil Im using is morris Golden film SAE30.
Please help as I am struggling abit.
I am at the stage of valve train, I have replaced the cam and I have new followers wrapped in greaseproof paper and covered in a protective gunk, which I cleaned off with brake cleaner. The book I have it states to hold pressure against a submerged lifter for 30 sec cycles to remove air and fill with oil. (bubbles of air do emerge but the end result is, not solid, still squishy).
I dont understand the preload of 1.5 or 2 turns, (surely done when lifter is solid? with air bled?)
If I set rocker adjustment screws at (just touching on comp stroke) for static timing, is that ok with new/ dry lifters?
When then do I set preload adjustment when new cam requires 20min engine running to burnish lobes?
Oil Im using is morris Golden film SAE30.
Please help as I am struggling abit.