Duc's Hybrid build
07-03-2011, 09:00 PM
#17
Thread Starter
for the next few days im visiting fam down in Tucson but when i get home its cleaning time! i got the kiddie pool for the engine and lots of mineral spirits and brushes. question. im going to rebuild the oil pump and i am going to take the "pressure springs" out and clean that area up. what should i lube the pressure regulating springs with? im thinking assembly lube...
07-07-2011, 12:05 AM
#18
Thread Starter
today i made great progress on cleaning the block. i used a kiddy pool with some solvent and a brush worked well. i also marked and started to remove pistons from the rods for cleaning before i send them to get fly cut for the euro heads. i can only soak 2 in the carb dip can at once, so it will be a few days. some of the rings came off, but most are stuck in the pistons.... :-(
07-07-2011, 11:46 AM
#19
Berrymans for the pistons.
07-07-2011, 12:23 PM
#20
Thread Starter
yup, chem-dip. thats what im using. works well. the new stuff is not as powerful as the old light green colored berrymans or yester-year... but the new stuff works well.
07-07-2011, 01:27 PM
#21
I needed 4 days each piston to get them spotless.
07-07-2011, 02:29 PM
#23
Its steel. Its fine.
07-08-2011, 12:50 AM
#27
Three Wheelin'
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07-08-2011, 07:17 PM
#28
Thread Starter
almost got all the pistons cleaned for shipping to get fly cut. wow, some had so much carbon crap on them, i would not be surprised if the compression ratio was higher...
07-09-2011, 08:10 PM
#29
Thread Starter
so i got the pistons all cleaned. one of them i kinda buggered up the top ring area by prying out a broken ring.... hummm. should be ok. im thinking i might send my second set of pistons to get fly cut as well, just in case.
so about this skirt coating....... what is it and who does it? i take it it is a friction reduction coating?
so about this skirt coating....... what is it and who does it? i take it it is a friction reduction coating?
07-09-2011, 08:19 PM
#30
Nordschleife Master
The coating on 928 pistons is iron from memory (ferrostan rings a bell?).
Its needed to stop the pistons galling on the cylinder walls - best thing to do is leave it well alone.. to not scrub with anything other than a reasonably soft nylon brush, using a non-caustic cleaner.
Its needed to stop the pistons galling on the cylinder walls - best thing to do is leave it well alone.. to not scrub with anything other than a reasonably soft nylon brush, using a non-caustic cleaner.