nrgserv
Well-Known Member
was kinda expecting that answer.
most stuff you'll be able to do yourself, just be thorough and clean on the rebuild.
pressure testing as far as i'm aware (never actually seen it done, apart from youtube) is where the head is plugged on all the water galleries and compressed air attached. what pressure its taken to, i've no idea. the entire head is then immersed in a water bath and the temperature taken up to operating temp to simulate running and expand any cracks that may be present. leakage is indicated by bubbles.
skimming is by machine shop and reletively straight forward, as long as the machinist knows how to operate the miller and the cutter is decent.
as a guide when i cooked my manual 300 head, spent about 4 weeks regulary topping it up with water until i got round to doing it (3 years ago just after i got it - caused by a leaky rad) it passed the pressure test and took 3 passes of the miller to get it flat and its been good since.
did a mates shortly after, he'd done about 7 miles after the water pump gave in and came home without water. his passed pressure test and took 12 passes of the miller. engine shop guy was amazed how bent it was.
i'd have to enquire how much is removed on one pass.
would it be worth getting a built up head sent out there?
most stuff you'll be able to do yourself, just be thorough and clean on the rebuild.
pressure testing as far as i'm aware (never actually seen it done, apart from youtube) is where the head is plugged on all the water galleries and compressed air attached. what pressure its taken to, i've no idea. the entire head is then immersed in a water bath and the temperature taken up to operating temp to simulate running and expand any cracks that may be present. leakage is indicated by bubbles.
skimming is by machine shop and reletively straight forward, as long as the machinist knows how to operate the miller and the cutter is decent.
as a guide when i cooked my manual 300 head, spent about 4 weeks regulary topping it up with water until i got round to doing it (3 years ago just after i got it - caused by a leaky rad) it passed the pressure test and took 3 passes of the miller to get it flat and its been good since.
did a mates shortly after, he'd done about 7 miles after the water pump gave in and came home without water. his passed pressure test and took 12 passes of the miller. engine shop guy was amazed how bent it was.
i'd have to enquire how much is removed on one pass.
would it be worth getting a built up head sent out there?