S&S Cycle - S&S Performance Parts 2025 L - Volume 67

1936-'84

Phone: 608-627-1497

1 -2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX

Fitment • 1948–’64 panhead engines with tin primary • 1965–’69 panhead & generator shovelhead with alloy primary • Features and benefits • Pre-clearanced for strokes up to and including 5"

• Motor mounts on crankcases for knucklehead engines are machined to fit stock 1936–‘47 frames An adapter plate is included for 1948 and later style frames • All cases are designed for late style generator (two brush type) with 5/16" mounting bolts to eliminate early generator cradle/mounting strap bosses for simplicity and economics • Timken® sprocket shaft main bearing, in all years, instead of stock straight roller bearings—resulting in better flywheel assembly stability, placement, and longer engine life Kit Contents • Crankcase assembly • All required bearings and hardware for installation • Assembly instructions

31-0010

®

Super Stock® Generator Crankcases For 1936–'99 Big Twin Stock Bore Crankcase Style Part #

Notes

31-0010 (HD-24519-65)

1965–'69 Panhead or Shovelhead

1,3,5

31-0008 (HD-24519-63, 24519-58, 24519-55) 31-0008 (HD-24519-63, 24519-58, 24519-55)

1948–'64 Panhead

1,2,4,6

P-Series Replacement 1965

1,5,6

1948-'84 Custom BT 35/8" Bore

31-0026

-

All S&S crankcases use Timken® style sprocket shaft bearings and 1958 & later pinion bearings These cases will not accept stock 1957 & earlier flywheel assemblies

1 1936–'69 style oil pump 2 Machined for 1948–'62 panhead cylinder base oil feed 3 Includes primary scavenge port machining

Engines for 1936–’64 chassis with tin primary must use a 1955–’64 style inner primary cover Since all S&S generator style crankcases use 1958 and later style main bearings, stock flywheel assemblies 1957 and earlier cannot be used in S&S crankcases Fly wheel assemblies must have 1958 and later pinion shaft with 1 250" diameter bearing, and a 1954 and later style sprocket shaft designed for a Timken® main bearing Generator style cases for 1936–’47 knucklehead engines are machined to supply oil to the heads from a boss located near the rear tappet guide or from a stock or S&S gearcover Provision for oil scavenging from the heads in these crankcases is the same as stock, with passageways that connect the tappet guides to the crankcase breather gear Crankcases for 1948–’69 engines are machined with a provision to separate the oil supply to the top and bottom ends if an S&S oil pump is used This feature lets you choose the 1972 and earlier stock "side oiling" system or the 1973 and later split oil system The stock cast iron oil pump can be used for the "original look" and stock oiling system If an S&S billet oil pump, part #31-6200 is used, the oiling system can be set-up as stock or updated to a split system 1963–’65 panhead engines, with outside oil supply lines to the cylinder heads, must use the oil supply port located behind the rear tappet guide or the oil fitting toward the rear of the S&S gearcover S&S generator style crankcases do not have the stock style "outside oiler" oil supply boss, so special oil supply lines will need to be fabricated

Replacement Parts: See page 5-82

5-43