Subject: Issue with setting end float on new short block (1.775mm to fill!)
bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
Posts: 6661
Threads: 534
Registered: April 8th, 2005
Member Is Offline
Location: Tanah Merah, SE-QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: A bee bit ma' bottom, now ma' bottom's big!
posted on February 11th, 2014 at 06:42 PM
Issue with setting end float on new short block (1.775mm to fill!)
G'day!
I'm setting up end float on this new short block. Its a new CB case, new chinese cw crank, new vanadium flywheel, std oem bearings.
With no shims, i have approx 1.775mm of crank float to shim up. For 0.001 inch clearance for each shim, this equates to approximately 5 x 0.36 mm
shims and 1 x 0.32 mm shim to get desired end float !
With the end float taken up, there is no binding of crank on the case inside. I really don't want to strip down the short block again after all the
effort of assembly. Crankshaft engineering already did alot of work on the crank with machining bearing clearances for big ends and mains, rods,
balancing, and flywheel runout issues with main seal. (On that note, they made mention that brazilian oem std vw factory bearings showed terrible
inconsistencies for tolerances between the bearings).
Can I just run the shims, given there is no binding? I'm under the assumption that the excess endfloat is the result of the addition of lots of
'error' / deviation from oem specs given every component is aftermarket (dimensions of case thrust surface machining, crank, flywheel and even the
oem thrust bearing). Do i need to machine the flywheel instead perhaps?
Any help / wisdom greatly appreciated.
thanks
concerned Chris
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears.
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
posted on February 11th, 2014 at 07:51 PM
Easiest thing to machine would be the flywheel but crank nose would be the better one to machine.
I mean, some say that so long as you use odd number of shims then it's all good but I'd prefer to use what VW recommended
Oh, if you are using the metal gasket on the crank nose then discard that. Later cranks only need the f/wheel O ring. That'll take 0.25mm from
things.
madness is in the eye of the beholder
matberry
Super Moderator
Go hard or go home
Posts: 8114
Threads: 134
Registered: March 7th, 2006
Member Is Offline
Location: Cooroy Qld
Theme: UltimaBB Pro Blue
Mood: enjoying waving at all my Kombi buddies from my T3
posted on February 11th, 2014 at 10:12 PM
If it was me, I would do what is necessary to run the correct 3 shims. The issue is either the crank and flywheel match or they are not going all the
way home when checking.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
MickH
A.k.a.: Michael Hutchinson
Bishop of Volkswagenism
Hairy Gutted Sloth
Posts: 3389
Threads: 29
Registered: September 6th, 2003
Member Is Offline
Location: TownsvilleTropical North QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: Grow a brain...walls don't hit back...
posted on February 11th, 2014 at 11:49 PM
I'm with Mat on this one....only use 3 shims. Have you tried a different flywheel??
tssnq.com.au
ragged
A.k.a.: David
Wolfsburg Wizard
Just ask if you need HELP!
Posts: 478
Threads: 46
Registered: January 25th, 2005
Member Is Offline
Location: Adelaide
Theme: UltimaBB Pro Blue
Mood: Medication seems to be working
posted on February 11th, 2014 at 11:56 PM
With no shims, i have approx 1.775mm of crank float to shim up. For 0.001 inch clearance for each shim, this equates to approximately 5 x 0.36 mm
shims and 1 x 0.32 mm shim to get desired end float !
Chris, My calculations for the above shims will not give you any end float. (5 x 0.36) +0.32 = 2.12mm ??? Dave
bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
Posts: 6661
Threads: 534
Registered: April 8th, 2005
Member Is Offline
Location: Tanah Merah, SE-QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: A bee bit ma' bottom, now ma' bottom's big!
posted on February 12th, 2014 at 08:15 AM
Quote:
Originally
posted by ragged
With no shims, i have approx 1.775mm of crank float to shim up. For 0.001 inch clearance for each shim, this equates to approximately 5 x 0.36 mm
shims and 1 x 0.32 mm shim to get desired end float !
Chris, My calculations for the above shims will not give you any end float. (5 x 0.36) +0.32 = 2.12mm ??? Dave
Bugger! I'll check the excel spreadsheet when i get home, i must have a typo somewhere. maybe it was 4 x 0.36 and 1 x 0.3 i typed in the
spreadsheet.
I got 2 x 0.32 and 1 x 0.3 at the moment with a mile of end float left .
Thanks gents, for the tips. I haven't got a spare 8 dowelled flywheel. Its meant to be some ducks nuts chrome vanadium, with work already done in
sorting some main seal runout issues. I don't want to go to the effort of shortening teh crank, i think the most inexpensive option would be to
machine the flywheel. You gents agree?
thanks again,
Chris.
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears.
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
posted on February 12th, 2014 at 06:22 PM
Yup, when I said easiest I also meant cheapest
madness is in the eye of the beholder
vwo60
Veteran Volks Folk
Posts: 2036
Threads: 71
Registered: February 13th, 2007
Member Is Offline
Location: Pomona Qld
Theme: UltimaBB Psyche Blue
Mood: good
posted on February 13th, 2014 at 10:27 AM
Simplest thing to do would be to machine the mounting face of the flywheel the amout you have calculated, not hard to do, just a bit of time setting
it up.
matberry
Super Moderator
Go hard or go home
Posts: 8114
Threads: 134
Registered: March 7th, 2006
Member Is Offline
Location: Cooroy Qld
Theme: UltimaBB Pro Blue
Mood: enjoying waving at all my Kombi buddies from my T3
posted on February 13th, 2014 at 11:35 AM
Quote:
Originally
posted by vwo60
Simplest thing to do would be to machine the mounting face of the flywheel the amout you have calculated, not hard to do, just a bit of time setting
it up.
x2
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
posted on February 11th, 2014 at 06:42 PM
!
.
