Gearcase-weedless Drive Parts for 1978 Johnson 4 hp 4R78E Outboard Motor
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A complete lower unit may be available for less than $950. Find one Reference numbers in this diagram can be found in a light blue row below — scroll down to order.
#1 — 309646 — SCREW, 15/16" LONG (2 required per assembly) | ||
#1 — 308707 — SCREW, 13/16" LONG (2 required per assembly) | ||
#2 — 302963 — SCREW, IMPELLER HOUSING (2 required per assembly) | ||
#3 — 310344 — HOUSING, IMPELLER (1 required per assembly) | ||
0310344 - Impeller Housing [ More info ] Unavailable |
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#4 — 203132 — PLATE, WATER PUMP (1 required per assembly) | ||
#5 — 277181 — IMPELLER ASSEMBLY (1 required per assembly) | ||
0277181 - Impeller Assembly [ More info ] Unavailable |
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0434424 - Impeller - See Notes - for metal pump housing [ More info ] |
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18-3001 - Impeller 434424 - See Notes On Detail Page [ More info ] |
#6 — 306196 — PIN, IMPELLER (1 required per assembly) | ||
#7 — 310345 — DRIVESHAFT, STANDARD (1 required per assembly) | ||
0310345 - Drive Shaft [ More info ] Unavailable |
#7 — 205350 — DRIVESHAFT 5" LONGER PARTS (1 required per assembly) | ||
#8 — 386179 — PROPELLER SHAFT ASSY. (1 required per assembly) | ||
#9 — 301917 — SEAL, BEARING HOUSING (1 required per assembly) | ||
#10 — 382787 — GEARCASE AND EXH. COV. ASSY. (1 required per assembly) | ||
0382787 - Gearcase Housing [ More info ] Unavailable |
#11 — 314167 — OIL RETAINER (1 required per assembly) | ||
#12 — 203190 — RIVET, EXHAUST COVER (1 required per assembly) | ||
#13 — 303068 — WASHER, COVER RIVET (1 required per assembly) | ||
#14 — 203342 — SCREW, EXHAUST COVER (1 required per assembly) | ||
#15 — 204316 — COVER, EXHAUST (1 required per assembly) | ||
#16 — 203140 — BEARING, THRUST (1 required per assembly) | ||
#17 — 307551 — PLUG AND WASHER (2 required per assembly) | ||
0307551 - Drain Screw, Allen Type, Gasket Included [ More info ] |
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18-4255 - Drain Screw, 307551 Allen Type, Gasket Included [ More info ] |
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18-2387 - Drain Plug Slotted or Allen - No Gasket [ More info ] |
#18 — 203648 — PINION, DRIVESHAFT (1 required per assembly) | ||
#19 — 384714 — BEARING HOUSING ASSY. (1 required per assembly) | ||
0384714 - Bearing Carrier [ More info ] Unavailable |
#20 — 314167 — OIL RETAINER (1 required per assembly) | ||
#21 — 302974 — SCREW, BEARING HOUSING (2 required per assembly) | ||
#22 — 317372 — GROMMET, WATER TUBE, LOWER (1 required per assembly) | ||
#23 — 313693 — COTTER PIN, PROPELLER NUT (1 required per assembly) | ||
#24 — 319004 — PROPELLER, 6-1/4" X 6" (1 required per assembly) | ||
0319004 - Plastic Propeller, 4 Weedless, 6 1/4 X 6 [ More info ] |
#25 — 316559 — HUB, PROPELLER CLUTCH (1 required per assembly) | ||
#26 — 315471 — RING, PROPELLER CLUTCH (1 required per assembly) | ||
#27 — 316558 — PIN, PROPELLER DRIVE (1 required per assembly) | ||
0316558 - Propeller Drive Pin [ More info ] Unavailable |
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0326032 - DRIVE PIN 10PK [ More info ] Unavailable |
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#28 — 202893 — 'O' RING, DRIVESHAFT 5" LONGER PARTS (1 required per assembly) | ||
#29 — 309646 — SCREW, EXTENSION 5" LONGER PARTS (4 required per assembly) | ||
#30 — 310744 — PILOT RING, EXTENSION 5" LONGER PARTS (1 required per assembly) | ||
#31 — 310355 — EXTENSION, GEARCASE 5" LONGER PARTS (1 required per assembly) | ||
0310355 - Gearcase Extension 5 Inch Longer Parts [ More info ] |
#32 — 323677 — WATER TUBE 5" LONGER PARTS (1 required per assembly) | ||
0323677 - Water Tube-LONG [ More info ] Unavailable |
#33 — 379763 — IMPELLER REPAIR KIT (1 required per assembly) | ||
#34 — 379770 — WATER PUMP REPAIR KIT (1 required per assembly) | ||
#35 — 382076 — CHROME PUMP KIT (1 required per assembly) | ||
0382076 - Chrome Pump Kit [ More info ] Unavailable |
#311598 — 311598 — WASHER, PLUG. NOT SHOWN (1 required per assembly) | ||
#315338 — 315338 — GASKET, EXHAUST HOUSING 5" LONGER PARTS. NOT SHOWN (1 required per assembly) | ||
#323286 — 323286 — GROMMET, WATER TUBE 5" LONGER PARTS. NOT SHOWN (1 required per assembly) | ||
#323443 — 323443 — GASKET 5" LONGER PARTS. NOT SHOWN (1 required per assembly) | ||
0323443 [ More info ] Unavailable Replaced by 0323936 |
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#386493 — 386493 — GEARCASE ASSEMBLY. NOT SHOWN (1 required per assembly) | ||
0386493 - Gearcase Assembly [ More info ] Unavailable |
#389221 — 389221 — EXTENSION KIT ASSY -5" 5" LONGER PARTS. NOT SHOWN (1 required per assembly) | ||